author | darcy |
Tue, 06 Aug 2013 16:01:39 -0700 | |
changeset 19213 | c360667a0da2 |
parent 5506 | 202f599c92aa |
child 21278 | ef8a3a2a72f2 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.beans.beancontext; |
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import java.util.ArrayList; |
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import java.util.Collection; |
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import java.util.HashMap; |
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import java.util.HashSet; |
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import java.util.Iterator; |
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import java.util.Map; |
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import java.util.Map.Entry; |
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import java.io.IOException; |
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import java.io.ObjectInputStream; |
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import java.io.ObjectOutputStream; |
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import java.io.Serializable; |
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import java.util.TooManyListenersException; |
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import java.util.Locale; |
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/** |
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* <p> |
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* This helper class provides a utility implementation of the |
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* java.beans.beancontext.BeanContextServices interface. |
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* </p> |
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* <p> |
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* Since this class directly implements the BeanContextServices interface, |
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* the class can, and is intended to be used either by subclassing this |
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* implementation, or via delegation of an instance of this class |
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* from another through the BeanContextProxy interface. |
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* </p> |
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* |
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* @author Laurence P. G. Cable |
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* @since 1.2 |
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*/ |
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public class BeanContextServicesSupport extends BeanContextSupport |
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implements BeanContextServices { |
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77898184e343
4769844: classes in java.beans that are serializable but don't define serialVersionUID
malenkov
parents:
2
diff
changeset
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private static final long serialVersionUID = -8494482757288719206L; |
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/** |
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* <p> |
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* Construct a BeanContextServicesSupport instance |
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* </p> |
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* |
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* @param peer The peer BeanContext we are supplying an implementation for, if null the this object is its own peer |
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* @param lcle The current Locale for this BeanContext. |
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* @param dTime The initial state, true if in design mode, false if runtime. |
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* @param visible The initial visibility. |
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* |
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*/ |
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public BeanContextServicesSupport(BeanContextServices peer, Locale lcle, boolean dTime, boolean visible) { |
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super(peer, lcle, dTime, visible); |
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} |
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/** |
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* Create an instance using the specified Locale and design mode. |
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* |
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* @param peer The peer BeanContext we are supplying an implementation for, if null the this object is its own peer |
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* @param lcle The current Locale for this BeanContext. |
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* @param dtime The initial state, true if in design mode, false if runtime. |
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*/ |
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public BeanContextServicesSupport(BeanContextServices peer, Locale lcle, boolean dtime) { |
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this (peer, lcle, dtime, true); |
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} |
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/** |
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* Create an instance using the specified locale |
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* |
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* @param peer The peer BeanContext we are supplying an implementation for, if null the this object is its own peer |
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* @param lcle The current Locale for this BeanContext. |
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*/ |
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public BeanContextServicesSupport(BeanContextServices peer, Locale lcle) { |
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this (peer, lcle, false, true); |
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} |
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/** |
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* Create an instance with a peer |
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* |
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* @param peer The peer BeanContext we are supplying an implementation for, if null the this object is its own peer |
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*/ |
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public BeanContextServicesSupport(BeanContextServices peer) { |
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this (peer, null, false, true); |
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} |
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/** |
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* Create an instance that is not a delegate of another object |
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*/ |
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public BeanContextServicesSupport() { |
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this (null, null, false, true); |
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} |
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/** |
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* called by BeanContextSupport superclass during construction and |
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* deserialization to initialize subclass transient state. |
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* |
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* subclasses may envelope this method, but should not override it or |
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* call it directly. |
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*/ |
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public void initialize() { |
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super.initialize(); |
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services = new HashMap(serializable + 1); |
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bcsListeners = new ArrayList(1); |
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} |
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/** |
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* Gets the <tt>BeanContextServices</tt> associated with this |
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* <tt>BeanContextServicesSupport</tt>. |
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* |
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* @return the instance of <tt>BeanContext</tt> |
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* this object is providing the implementation for. |
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*/ |
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public BeanContextServices getBeanContextServicesPeer() { |
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return (BeanContextServices)getBeanContextChildPeer(); |
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} |
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/************************************************************************/ |
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/* |
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* protected nested class containing per child information, an instance |
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* of which is associated with each child in the "children" hashtable. |
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* subclasses can extend this class to include their own per-child state. |
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* |
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* Note that this 'value' is serialized with the corresponding child 'key' |
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* when the BeanContextSupport is serialized. |
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*/ |
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protected class BCSSChild extends BeanContextSupport.BCSChild { |
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private static final long serialVersionUID = -3263851306889194873L; |
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/* |
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* private nested class to map serviceClass to Provider and requestors |
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* listeners. |
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*/ |
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class BCSSCServiceClassRef { |
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// create an instance of a service ref |
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BCSSCServiceClassRef(Class sc, BeanContextServiceProvider bcsp, boolean delegated) { |
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super(); |
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serviceClass = sc; |
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if (delegated) |
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delegateProvider = bcsp; |
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else |
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serviceProvider = bcsp; |
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} |
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// add a requestor and assoc listener |
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void addRequestor(Object requestor, BeanContextServiceRevokedListener bcsrl) throws TooManyListenersException { |
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BeanContextServiceRevokedListener cbcsrl = (BeanContextServiceRevokedListener)requestors.get(requestor); |
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if (cbcsrl != null && !cbcsrl.equals(bcsrl)) |
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throw new TooManyListenersException(); |
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requestors.put(requestor, bcsrl); |
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} |
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// remove a requestor |
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void removeRequestor(Object requestor) { |
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requestors.remove(requestor); |
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} |
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// check a requestors listener |
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void verifyRequestor(Object requestor, BeanContextServiceRevokedListener bcsrl) throws TooManyListenersException { |
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BeanContextServiceRevokedListener cbcsrl = (BeanContextServiceRevokedListener)requestors.get(requestor); |
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if (cbcsrl != null && !cbcsrl.equals(bcsrl)) |
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throw new TooManyListenersException(); |
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} |
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void verifyAndMaybeSetProvider(BeanContextServiceProvider bcsp, boolean isDelegated) { |
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BeanContextServiceProvider current; |
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if (isDelegated) { // the provider is delegated |
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current = delegateProvider; |
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if (current == null || bcsp == null) { |
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delegateProvider = bcsp; |
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return; |
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} |
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} else { // the provider is registered with this BCS |
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current = serviceProvider; |
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if (current == null || bcsp == null) { |
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serviceProvider = bcsp; |
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return; |
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} |
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} |
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if (!current.equals(bcsp)) |
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throw new UnsupportedOperationException("existing service reference obtained from different BeanContextServiceProvider not supported"); |
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} |
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Iterator cloneOfEntries() { |
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return ((HashMap)requestors.clone()).entrySet().iterator(); |
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} |
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Iterator entries() { return requestors.entrySet().iterator(); } |
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boolean isEmpty() { return requestors.isEmpty(); } |
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Class getServiceClass() { return serviceClass; } |
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BeanContextServiceProvider getServiceProvider() { |
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return serviceProvider; |
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} |
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BeanContextServiceProvider getDelegateProvider() { |
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return delegateProvider; |
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} |
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boolean isDelegated() { return delegateProvider != null; } |
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void addRef(boolean delegated) { |
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if (delegated) { |
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delegateRefs++; |
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} else { |
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serviceRefs++; |
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} |
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} |
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void releaseRef(boolean delegated) { |
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if (delegated) { |
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if (--delegateRefs == 0) { |
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delegateProvider = null; |
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} |
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} else { |
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if (--serviceRefs <= 0) { |
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serviceProvider = null; |
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} |
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} |
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} |
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int getRefs() { return serviceRefs + delegateRefs; } |
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int getDelegateRefs() { return delegateRefs; } |
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int getServiceRefs() { return serviceRefs; } |
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/* |
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* fields |
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*/ |
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Class serviceClass; |
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BeanContextServiceProvider serviceProvider; |
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int serviceRefs; |
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BeanContextServiceProvider delegateProvider; // proxy |
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int delegateRefs; |
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HashMap requestors = new HashMap(1); |
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} |
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/* |
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* per service reference info ... |
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*/ |
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class BCSSCServiceRef { |
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BCSSCServiceRef(BCSSCServiceClassRef scref, boolean isDelegated) { |
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serviceClassRef = scref; |
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delegated = isDelegated; |
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} |
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void addRef() { refCnt++; } |
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int release() { return --refCnt; } |
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BCSSCServiceClassRef getServiceClassRef() { return serviceClassRef; } |
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boolean isDelegated() { return delegated; } |
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/* |
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* fields |
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*/ |
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BCSSCServiceClassRef serviceClassRef; |
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int refCnt = 1; |
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boolean delegated = false; |
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} |
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BCSSChild(Object bcc, Object peer) { super(bcc, peer); } |
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// note usage of service per requestor, per service |
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synchronized void usingService(Object requestor, Object service, Class serviceClass, BeanContextServiceProvider bcsp, boolean isDelegated, BeanContextServiceRevokedListener bcsrl) throws TooManyListenersException, UnsupportedOperationException { |
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// first, process mapping from serviceClass to requestor(s) |
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BCSSCServiceClassRef serviceClassRef = null; |
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if (serviceClasses == null) |
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serviceClasses = new HashMap(1); |
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else |
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serviceClassRef = (BCSSCServiceClassRef)serviceClasses.get(serviceClass); |
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if (serviceClassRef == null) { // new service being used ... |
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serviceClassRef = new BCSSCServiceClassRef(serviceClass, bcsp, isDelegated); |
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serviceClasses.put(serviceClass, serviceClassRef); |
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} else { // existing service ... |
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serviceClassRef.verifyAndMaybeSetProvider(bcsp, isDelegated); // throws |
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serviceClassRef.verifyRequestor(requestor, bcsrl); // throws |
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} |
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serviceClassRef.addRequestor(requestor, bcsrl); |
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serviceClassRef.addRef(isDelegated); |
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// now handle mapping from requestor to service(s) |
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BCSSCServiceRef serviceRef = null; |
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Map services = null; |
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if (serviceRequestors == null) { |
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serviceRequestors = new HashMap(1); |
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} else { |
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services = (Map)serviceRequestors.get(requestor); |
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} |
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if (services == null) { |
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services = new HashMap(1); |
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serviceRequestors.put(requestor, services); |
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} else |
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serviceRef = (BCSSCServiceRef)services.get(service); |
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if (serviceRef == null) { |
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serviceRef = new BCSSCServiceRef(serviceClassRef, isDelegated); |
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services.put(service, serviceRef); |
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} else { |
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serviceRef.addRef(); |
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} |
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} |
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// release a service reference |
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synchronized void releaseService(Object requestor, Object service) { |
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if (serviceRequestors == null) return; |
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Map services = (Map)serviceRequestors.get(requestor); |
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if (services == null) return; // oops its not there anymore! |
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BCSSCServiceRef serviceRef = (BCSSCServiceRef)services.get(service); |
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if (serviceRef == null) return; // oops its not there anymore! |
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BCSSCServiceClassRef serviceClassRef = serviceRef.getServiceClassRef(); |
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boolean isDelegated = serviceRef.isDelegated(); |
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BeanContextServiceProvider bcsp = isDelegated ? serviceClassRef.getDelegateProvider() : serviceClassRef.getServiceProvider(); |
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bcsp.releaseService(BeanContextServicesSupport.this.getBeanContextServicesPeer(), requestor, service); |
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serviceClassRef.releaseRef(isDelegated); |
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serviceClassRef.removeRequestor(requestor); |
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if (serviceRef.release() == 0) { |
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services.remove(service); |
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if (services.isEmpty()) { |
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serviceRequestors.remove(requestor); |
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serviceClassRef.removeRequestor(requestor); |
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} |
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if (serviceRequestors.isEmpty()) { |
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serviceRequestors = null; |
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} |
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if (serviceClassRef.isEmpty()) { |
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serviceClasses.remove(serviceClassRef.getServiceClass()); |
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} |
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if (serviceClasses.isEmpty()) |
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serviceClasses = null; |
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} |
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} |
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// revoke a service |
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synchronized void revokeService(Class serviceClass, boolean isDelegated, boolean revokeNow) { |
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if (serviceClasses == null) return; |
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BCSSCServiceClassRef serviceClassRef = (BCSSCServiceClassRef)serviceClasses.get(serviceClass); |
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425 |
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426 |
if (serviceClassRef == null) return; |
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427 |
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Iterator i = serviceClassRef.cloneOfEntries(); |
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429 |
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BeanContextServiceRevokedEvent bcsre = new BeanContextServiceRevokedEvent(BeanContextServicesSupport.this.getBeanContextServicesPeer(), serviceClass, revokeNow); |
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boolean noMoreRefs = false; |
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432 |
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433 |
while (i.hasNext() && serviceRequestors != null) { |
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Map.Entry entry = (Map.Entry)i.next(); |
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435 |
BeanContextServiceRevokedListener listener = (BeanContextServiceRevokedListener)entry.getValue(); |
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436 |
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437 |
if (revokeNow) { |
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Object requestor = entry.getKey(); |
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Map services = (Map)serviceRequestors.get(requestor); |
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440 |
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441 |
if (services != null) { |
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Iterator i1 = services.entrySet().iterator(); |
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443 |
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444 |
while (i1.hasNext()) { |
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Map.Entry tmp = (Map.Entry)i1.next(); |
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447 |
BCSSCServiceRef serviceRef = (BCSSCServiceRef)tmp.getValue(); |
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448 |
if (serviceRef.getServiceClassRef().equals(serviceClassRef) && isDelegated == serviceRef.isDelegated()) { |
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i1.remove(); |
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} |
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451 |
} |
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452 |
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453 |
if (noMoreRefs = services.isEmpty()) { |
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serviceRequestors.remove(requestor); |
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} |
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} |
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if (noMoreRefs) serviceClassRef.removeRequestor(requestor); |
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} |
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listener.serviceRevoked(bcsre); |
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} |
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464 |
if (revokeNow && serviceClasses != null) { |
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465 |
if (serviceClassRef.isEmpty()) |
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serviceClasses.remove(serviceClass); |
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467 |
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468 |
if (serviceClasses.isEmpty()) |
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serviceClasses = null; |
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} |
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471 |
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472 |
if (serviceRequestors != null && serviceRequestors.isEmpty()) |
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serviceRequestors = null; |
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} |
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475 |
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476 |
// release all references for this child since it has been unnested. |
|
477 |
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478 |
void cleanupReferences() { |
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479 |
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480 |
if (serviceRequestors == null) return; |
|
481 |
||
482 |
Iterator requestors = serviceRequestors.entrySet().iterator(); |
|
483 |
||
484 |
while(requestors.hasNext()) { |
|
485 |
Map.Entry tmp = (Map.Entry)requestors.next(); |
|
486 |
Object requestor = tmp.getKey(); |
|
487 |
Iterator services = ((Map)tmp.getValue()).entrySet().iterator(); |
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488 |
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489 |
requestors.remove(); |
|
490 |
||
491 |
while (services.hasNext()) { |
|
492 |
Map.Entry entry = (Map.Entry)services.next(); |
|
493 |
Object service = entry.getKey(); |
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494 |
BCSSCServiceRef sref = (BCSSCServiceRef)entry.getValue(); |
|
495 |
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496 |
BCSSCServiceClassRef scref = sref.getServiceClassRef(); |
|
497 |
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498 |
BeanContextServiceProvider bcsp = sref.isDelegated() ? scref.getDelegateProvider() : scref.getServiceProvider(); |
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499 |
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500 |
scref.removeRequestor(requestor); |
|
501 |
services.remove(); |
|
502 |
||
503 |
while (sref.release() >= 0) { |
|
504 |
bcsp.releaseService(BeanContextServicesSupport.this.getBeanContextServicesPeer(), requestor, service); |
|
505 |
} |
|
506 |
} |
|
507 |
} |
|
508 |
||
509 |
serviceRequestors = null; |
|
510 |
serviceClasses = null; |
|
511 |
} |
|
512 |
||
513 |
void revokeAllDelegatedServicesNow() { |
|
514 |
if (serviceClasses == null) return; |
|
515 |
||
516 |
Iterator serviceClassRefs = |
|
517 |
new HashSet(serviceClasses.values()).iterator(); |
|
518 |
||
519 |
while (serviceClassRefs.hasNext()) { |
|
520 |
BCSSCServiceClassRef serviceClassRef = (BCSSCServiceClassRef)serviceClassRefs.next(); |
|
521 |
||
522 |
if (!serviceClassRef.isDelegated()) continue; |
|
523 |
||
524 |
Iterator i = serviceClassRef.cloneOfEntries(); |
|
525 |
BeanContextServiceRevokedEvent bcsre = new BeanContextServiceRevokedEvent(BeanContextServicesSupport.this.getBeanContextServicesPeer(), serviceClassRef.getServiceClass(), true); |
|
526 |
boolean noMoreRefs = false; |
|
527 |
||
528 |
while (i.hasNext()) { |
|
529 |
Map.Entry entry = (Map.Entry)i.next(); |
|
530 |
BeanContextServiceRevokedListener listener = (BeanContextServiceRevokedListener)entry.getValue(); |
|
531 |
||
532 |
Object requestor = entry.getKey(); |
|
533 |
Map services = (Map)serviceRequestors.get(requestor); |
|
534 |
||
535 |
if (services != null) { |
|
536 |
Iterator i1 = services.entrySet().iterator(); |
|
537 |
||
538 |
while (i1.hasNext()) { |
|
539 |
Map.Entry tmp = (Map.Entry)i1.next(); |
|
540 |
||
541 |
BCSSCServiceRef serviceRef = (BCSSCServiceRef)tmp.getValue(); |
|
542 |
if (serviceRef.getServiceClassRef().equals(serviceClassRef) && serviceRef.isDelegated()) { |
|
543 |
i1.remove(); |
|
544 |
} |
|
545 |
} |
|
546 |
||
547 |
if (noMoreRefs = services.isEmpty()) { |
|
548 |
serviceRequestors.remove(requestor); |
|
549 |
} |
|
550 |
} |
|
551 |
||
552 |
if (noMoreRefs) serviceClassRef.removeRequestor(requestor); |
|
553 |
||
554 |
listener.serviceRevoked(bcsre); |
|
555 |
||
556 |
if (serviceClassRef.isEmpty()) |
|
557 |
serviceClasses.remove(serviceClassRef.getServiceClass()); |
|
558 |
} |
|
559 |
} |
|
560 |
||
561 |
if (serviceClasses.isEmpty()) serviceClasses = null; |
|
562 |
||
563 |
if (serviceRequestors != null && serviceRequestors.isEmpty()) |
|
564 |
serviceRequestors = null; |
|
565 |
} |
|
566 |
||
567 |
/* |
|
568 |
* fields |
|
569 |
*/ |
|
570 |
||
571 |
private transient HashMap serviceClasses; |
|
572 |
private transient HashMap serviceRequestors; |
|
573 |
} |
|
574 |
||
575 |
/** |
|
576 |
* <p> |
|
577 |
* Subclasses can override this method to insert their own subclass |
|
578 |
* of Child without having to override add() or the other Collection |
|
579 |
* methods that add children to the set. |
|
580 |
* </p> |
|
581 |
* |
|
582 |
* @param targetChild the child to create the Child on behalf of |
|
583 |
* @param peer the peer if the targetChild and peer are related by BeanContextProxy |
|
584 |
*/ |
|
585 |
||
586 |
protected BCSChild createBCSChild(Object targetChild, Object peer) { |
|
587 |
return new BCSSChild(targetChild, peer); |
|
588 |
} |
|
589 |
||
590 |
/************************************************************************/ |
|
591 |
||
592 |
/** |
|
593 |
* subclasses may subclass this nested class to add behaviors for |
|
594 |
* each BeanContextServicesProvider. |
|
595 |
*/ |
|
596 |
||
597 |
protected static class BCSSServiceProvider implements Serializable { |
|
2482
77898184e343
4769844: classes in java.beans that are serializable but don't define serialVersionUID
malenkov
parents:
2
diff
changeset
|
598 |
private static final long serialVersionUID = 861278251667444782L; |
2 | 599 |
|
600 |
BCSSServiceProvider(Class sc, BeanContextServiceProvider bcsp) { |
|
601 |
super(); |
|
602 |
||
603 |
serviceProvider = bcsp; |
|
604 |
} |
|
605 |
||
19213 | 606 |
/** |
607 |
* Returns the service provider. |
|
608 |
* @return the service provider |
|
609 |
*/ |
|
2 | 610 |
protected BeanContextServiceProvider getServiceProvider() { |
611 |
return serviceProvider; |
|
612 |
} |
|
613 |
||
19213 | 614 |
/** |
615 |
* The service provider. |
|
2 | 616 |
*/ |
617 |
||
618 |
protected BeanContextServiceProvider serviceProvider; |
|
619 |
} |
|
620 |
||
621 |
/** |
|
622 |
* subclasses can override this method to create new subclasses of |
|
623 |
* BCSSServiceProvider without having to overrride addService() in |
|
624 |
* order to instantiate. |
|
19213 | 625 |
* @param sc the class |
626 |
* @param bcsp the service provider |
|
627 |
* @return a service provider without overriding addService() |
|
2 | 628 |
*/ |
629 |
||
630 |
protected BCSSServiceProvider createBCSSServiceProvider(Class sc, BeanContextServiceProvider bcsp) { |
|
631 |
return new BCSSServiceProvider(sc, bcsp); |
|
632 |
} |
|
633 |
||
634 |
/************************************************************************/ |
|
635 |
||
636 |
/** |
|
637 |
* add a BeanContextServicesListener |
|
638 |
* |
|
19213 | 639 |
* @throws NullPointerException if the argument is null |
2 | 640 |
*/ |
641 |
||
642 |
public void addBeanContextServicesListener(BeanContextServicesListener bcsl) { |
|
643 |
if (bcsl == null) throw new NullPointerException("bcsl"); |
|
644 |
||
645 |
synchronized(bcsListeners) { |
|
646 |
if (bcsListeners.contains(bcsl)) |
|
647 |
return; |
|
648 |
else |
|
649 |
bcsListeners.add(bcsl); |
|
650 |
} |
|
651 |
} |
|
652 |
||
653 |
/** |
|
654 |
* remove a BeanContextServicesListener |
|
655 |
*/ |
|
656 |
||
657 |
public void removeBeanContextServicesListener(BeanContextServicesListener bcsl) { |
|
658 |
if (bcsl == null) throw new NullPointerException("bcsl"); |
|
659 |
||
660 |
synchronized(bcsListeners) { |
|
661 |
if (!bcsListeners.contains(bcsl)) |
|
662 |
return; |
|
663 |
else |
|
664 |
bcsListeners.remove(bcsl); |
|
665 |
} |
|
666 |
} |
|
667 |
||
668 |
/** |
|
669 |
* add a service |
|
19213 | 670 |
* @param serviceClass the service class |
671 |
* @param bcsp the service provider |
|
2 | 672 |
*/ |
673 |
||
674 |
public boolean addService(Class serviceClass, BeanContextServiceProvider bcsp) { |
|
675 |
return addService(serviceClass, bcsp, true); |
|
676 |
} |
|
677 |
||
678 |
/** |
|
679 |
* add a service |
|
19213 | 680 |
* @param serviceClass the service class |
681 |
* @param bcsp the service provider |
|
682 |
* @param fireEvent whether or not an event should be fired |
|
683 |
* @return true if the service was successfully added |
|
2 | 684 |
*/ |
685 |
||
686 |
protected boolean addService(Class serviceClass, BeanContextServiceProvider bcsp, boolean fireEvent) { |
|
687 |
||
688 |
if (serviceClass == null) throw new NullPointerException("serviceClass"); |
|
689 |
if (bcsp == null) throw new NullPointerException("bcsp"); |
|
690 |
||
691 |
synchronized(BeanContext.globalHierarchyLock) { |
|
692 |
if (services.containsKey(serviceClass)) |
|
693 |
return false; |
|
694 |
else { |
|
695 |
services.put(serviceClass, createBCSSServiceProvider(serviceClass, bcsp)); |
|
696 |
||
697 |
if (bcsp instanceof Serializable) serializable++; |
|
698 |
||
699 |
if (!fireEvent) return true; |
|
700 |
||
701 |
||
702 |
BeanContextServiceAvailableEvent bcssae = new BeanContextServiceAvailableEvent(getBeanContextServicesPeer(), serviceClass); |
|
703 |
||
704 |
fireServiceAdded(bcssae); |
|
705 |
||
706 |
synchronized(children) { |
|
707 |
Iterator i = children.keySet().iterator(); |
|
708 |
||
709 |
while (i.hasNext()) { |
|
710 |
Object c = i.next(); |
|
711 |
||
712 |
if (c instanceof BeanContextServices) { |
|
713 |
((BeanContextServicesListener)c).serviceAvailable(bcssae); |
|
714 |
} |
|
715 |
} |
|
716 |
} |
|
717 |
||
718 |
return true; |
|
719 |
} |
|
720 |
} |
|
721 |
} |
|
722 |
||
723 |
/** |
|
724 |
* remove a service |
|
19213 | 725 |
* @param serviceClass the service class |
726 |
* @param bcsp the service provider |
|
727 |
* @param revokeCurrentServicesNow whether or not to revoke the service |
|
2 | 728 |
*/ |
729 |
||
730 |
public void revokeService(Class serviceClass, BeanContextServiceProvider bcsp, boolean revokeCurrentServicesNow) { |
|
731 |
||
732 |
if (serviceClass == null) throw new NullPointerException("serviceClass"); |
|
733 |
if (bcsp == null) throw new NullPointerException("bcsp"); |
|
734 |
||
735 |
synchronized(BeanContext.globalHierarchyLock) { |
|
736 |
if (!services.containsKey(serviceClass)) return; |
|
737 |
||
738 |
BCSSServiceProvider bcsssp = (BCSSServiceProvider)services.get(serviceClass); |
|
739 |
||
740 |
if (!bcsssp.getServiceProvider().equals(bcsp)) |
|
741 |
throw new IllegalArgumentException("service provider mismatch"); |
|
742 |
||
743 |
services.remove(serviceClass); |
|
744 |
||
745 |
if (bcsp instanceof Serializable) serializable--; |
|
746 |
||
747 |
Iterator i = bcsChildren(); // get the BCSChild values. |
|
748 |
||
749 |
while (i.hasNext()) { |
|
750 |
((BCSSChild)i.next()).revokeService(serviceClass, false, revokeCurrentServicesNow); |
|
751 |
} |
|
752 |
||
753 |
fireServiceRevoked(serviceClass, revokeCurrentServicesNow); |
|
754 |
} |
|
755 |
} |
|
756 |
||
757 |
/** |
|
758 |
* has a service, which may be delegated |
|
759 |
*/ |
|
760 |
||
761 |
public synchronized boolean hasService(Class serviceClass) { |
|
762 |
if (serviceClass == null) throw new NullPointerException("serviceClass"); |
|
763 |
||
764 |
synchronized(BeanContext.globalHierarchyLock) { |
|
765 |
if (services.containsKey(serviceClass)) return true; |
|
766 |
||
767 |
BeanContextServices bcs = null; |
|
768 |
||
769 |
try { |
|
770 |
bcs = (BeanContextServices)getBeanContext(); |
|
771 |
} catch (ClassCastException cce) { |
|
772 |
return false; |
|
773 |
} |
|
774 |
||
775 |
return bcs == null ? false : bcs.hasService(serviceClass); |
|
776 |
} |
|
777 |
} |
|
778 |
||
779 |
/************************************************************************/ |
|
780 |
||
781 |
/* |
|
782 |
* a nested subclass used to represent a proxy for serviceClasses delegated |
|
783 |
* to an enclosing BeanContext. |
|
784 |
*/ |
|
785 |
||
786 |
protected class BCSSProxyServiceProvider implements BeanContextServiceProvider, BeanContextServiceRevokedListener { |
|
787 |
||
788 |
BCSSProxyServiceProvider(BeanContextServices bcs) { |
|
789 |
super(); |
|
790 |
||
791 |
nestingCtxt = bcs; |
|
792 |
} |
|
793 |
||
794 |
public Object getService(BeanContextServices bcs, Object requestor, Class serviceClass, Object serviceSelector) { |
|
795 |
Object service = null; |
|
796 |
||
797 |
try { |
|
798 |
service = nestingCtxt.getService(bcs, requestor, serviceClass, serviceSelector, this); |
|
799 |
} catch (TooManyListenersException tmle) { |
|
800 |
return null; |
|
801 |
} |
|
802 |
||
803 |
return service; |
|
804 |
} |
|
805 |
||
806 |
public void releaseService(BeanContextServices bcs, Object requestor, Object service) { |
|
807 |
nestingCtxt.releaseService(bcs, requestor, service); |
|
808 |
} |
|
809 |
||
810 |
public Iterator getCurrentServiceSelectors(BeanContextServices bcs, Class serviceClass) { |
|
811 |
return nestingCtxt.getCurrentServiceSelectors(serviceClass); |
|
812 |
} |
|
813 |
||
814 |
public void serviceRevoked(BeanContextServiceRevokedEvent bcsre) { |
|
815 |
Iterator i = bcsChildren(); // get the BCSChild values. |
|
816 |
||
817 |
while (i.hasNext()) { |
|
818 |
((BCSSChild)i.next()).revokeService(bcsre.getServiceClass(), true, bcsre.isCurrentServiceInvalidNow()); |
|
819 |
} |
|
820 |
} |
|
821 |
||
822 |
/* |
|
823 |
* fields |
|
824 |
*/ |
|
825 |
||
826 |
private BeanContextServices nestingCtxt; |
|
827 |
} |
|
828 |
||
829 |
/************************************************************************/ |
|
830 |
||
831 |
/** |
|
832 |
* obtain a service which may be delegated |
|
833 |
*/ |
|
834 |
||
835 |
public Object getService(BeanContextChild child, Object requestor, Class serviceClass, Object serviceSelector, BeanContextServiceRevokedListener bcsrl) throws TooManyListenersException { |
|
836 |
if (child == null) throw new NullPointerException("child"); |
|
837 |
if (serviceClass == null) throw new NullPointerException("serviceClass"); |
|
838 |
if (requestor == null) throw new NullPointerException("requestor"); |
|
839 |
if (bcsrl == null) throw new NullPointerException("bcsrl"); |
|
840 |
||
841 |
Object service = null; |
|
842 |
BCSSChild bcsc; |
|
843 |
BeanContextServices bcssp = getBeanContextServicesPeer(); |
|
844 |
||
845 |
synchronized(BeanContext.globalHierarchyLock) { |
|
846 |
synchronized(children) { bcsc = (BCSSChild)children.get(child); } |
|
847 |
||
848 |
if (bcsc == null) throw new IllegalArgumentException("not a child of this context"); // not a child ... |
|
849 |
||
850 |
BCSSServiceProvider bcsssp = (BCSSServiceProvider)services.get(serviceClass); |
|
851 |
||
852 |
if (bcsssp != null) { |
|
853 |
BeanContextServiceProvider bcsp = bcsssp.getServiceProvider(); |
|
854 |
service = bcsp.getService(bcssp, requestor, serviceClass, serviceSelector); |
|
855 |
if (service != null) { // do bookkeeping ... |
|
856 |
try { |
|
857 |
bcsc.usingService(requestor, service, serviceClass, bcsp, false, bcsrl); |
|
858 |
} catch (TooManyListenersException tmle) { |
|
859 |
bcsp.releaseService(bcssp, requestor, service); |
|
860 |
throw tmle; |
|
861 |
} catch (UnsupportedOperationException uope) { |
|
862 |
bcsp.releaseService(bcssp, requestor, service); |
|
863 |
throw uope; // unchecked rt exception |
|
864 |
} |
|
865 |
||
866 |
return service; |
|
867 |
} |
|
868 |
} |
|
869 |
||
870 |
||
871 |
if (proxy != null) { |
|
872 |
||
873 |
// try to delegate ... |
|
874 |
||
875 |
service = proxy.getService(bcssp, requestor, serviceClass, serviceSelector); |
|
876 |
||
877 |
if (service != null) { // do bookkeeping ... |
|
878 |
try { |
|
879 |
bcsc.usingService(requestor, service, serviceClass, proxy, true, bcsrl); |
|
880 |
} catch (TooManyListenersException tmle) { |
|
881 |
proxy.releaseService(bcssp, requestor, service); |
|
882 |
throw tmle; |
|
883 |
} catch (UnsupportedOperationException uope) { |
|
884 |
proxy.releaseService(bcssp, requestor, service); |
|
885 |
throw uope; // unchecked rt exception |
|
886 |
} |
|
887 |
||
888 |
return service; |
|
889 |
} |
|
890 |
} |
|
891 |
} |
|
892 |
||
893 |
return null; |
|
894 |
} |
|
895 |
||
896 |
/** |
|
897 |
* release a service |
|
898 |
*/ |
|
899 |
||
900 |
public void releaseService(BeanContextChild child, Object requestor, Object service) { |
|
901 |
if (child == null) throw new NullPointerException("child"); |
|
902 |
if (requestor == null) throw new NullPointerException("requestor"); |
|
903 |
if (service == null) throw new NullPointerException("service"); |
|
904 |
||
905 |
BCSSChild bcsc; |
|
906 |
||
907 |
synchronized(BeanContext.globalHierarchyLock) { |
|
908 |
synchronized(children) { bcsc = (BCSSChild)children.get(child); } |
|
909 |
||
910 |
if (bcsc != null) |
|
911 |
bcsc.releaseService(requestor, service); |
|
912 |
else |
|
913 |
throw new IllegalArgumentException("child actual is not a child of this BeanContext"); |
|
914 |
} |
|
915 |
} |
|
916 |
||
917 |
/** |
|
918 |
* @return an iterator for all the currently registered service classes. |
|
919 |
*/ |
|
920 |
||
921 |
public Iterator getCurrentServiceClasses() { |
|
922 |
return new BCSIterator(services.keySet().iterator()); |
|
923 |
} |
|
924 |
||
925 |
/** |
|
926 |
* @return an iterator for all the currently available service selectors |
|
927 |
* (if any) available for the specified service. |
|
928 |
*/ |
|
929 |
||
930 |
public Iterator getCurrentServiceSelectors(Class serviceClass) { |
|
931 |
||
932 |
BCSSServiceProvider bcsssp = (BCSSServiceProvider)services.get(serviceClass); |
|
933 |
||
934 |
return bcsssp != null ? new BCSIterator(bcsssp.getServiceProvider().getCurrentServiceSelectors(getBeanContextServicesPeer(), serviceClass)) : null; |
|
935 |
} |
|
936 |
||
937 |
/** |
|
938 |
* BeanContextServicesListener callback, propagates event to all |
|
939 |
* currently registered listeners and BeanContextServices children, |
|
940 |
* if this BeanContextService does not already implement this service |
|
941 |
* itself. |
|
942 |
* |
|
943 |
* subclasses may override or envelope this method to implement their |
|
944 |
* own propagation semantics. |
|
945 |
*/ |
|
946 |
||
947 |
public void serviceAvailable(BeanContextServiceAvailableEvent bcssae) { |
|
948 |
synchronized(BeanContext.globalHierarchyLock) { |
|
949 |
if (services.containsKey(bcssae.getServiceClass())) return; |
|
950 |
||
951 |
fireServiceAdded(bcssae); |
|
952 |
||
953 |
Iterator i; |
|
954 |
||
955 |
synchronized(children) { |
|
956 |
i = children.keySet().iterator(); |
|
957 |
} |
|
958 |
||
959 |
while (i.hasNext()) { |
|
960 |
Object c = i.next(); |
|
961 |
||
962 |
if (c instanceof BeanContextServices) { |
|
963 |
((BeanContextServicesListener)c).serviceAvailable(bcssae); |
|
964 |
} |
|
965 |
} |
|
966 |
} |
|
967 |
} |
|
968 |
||
969 |
/** |
|
970 |
* BeanContextServicesListener callback, propagates event to all |
|
971 |
* currently registered listeners and BeanContextServices children, |
|
972 |
* if this BeanContextService does not already implement this service |
|
973 |
* itself. |
|
974 |
* |
|
975 |
* subclasses may override or envelope this method to implement their |
|
976 |
* own propagation semantics. |
|
977 |
*/ |
|
978 |
||
979 |
public void serviceRevoked(BeanContextServiceRevokedEvent bcssre) { |
|
980 |
synchronized(BeanContext.globalHierarchyLock) { |
|
981 |
if (services.containsKey(bcssre.getServiceClass())) return; |
|
982 |
||
983 |
fireServiceRevoked(bcssre); |
|
984 |
||
985 |
Iterator i; |
|
986 |
||
987 |
synchronized(children) { |
|
988 |
i = children.keySet().iterator(); |
|
989 |
} |
|
990 |
||
991 |
while (i.hasNext()) { |
|
992 |
Object c = i.next(); |
|
993 |
||
994 |
if (c instanceof BeanContextServices) { |
|
995 |
((BeanContextServicesListener)c).serviceRevoked(bcssre); |
|
996 |
} |
|
997 |
} |
|
998 |
} |
|
999 |
} |
|
1000 |
||
1001 |
/** |
|
1002 |
* Gets the <tt>BeanContextServicesListener</tt> (if any) of the specified |
|
1003 |
* child. |
|
1004 |
* |
|
1005 |
* @param child the specified child |
|
1006 |
* @return the BeanContextServicesListener (if any) of the specified child |
|
1007 |
*/ |
|
1008 |
protected static final BeanContextServicesListener getChildBeanContextServicesListener(Object child) { |
|
1009 |
try { |
|
1010 |
return (BeanContextServicesListener)child; |
|
1011 |
} catch (ClassCastException cce) { |
|
1012 |
return null; |
|
1013 |
} |
|
1014 |
} |
|
1015 |
||
1016 |
/** |
|
1017 |
* called from superclass child removal operations after a child |
|
1018 |
* has been successfully removed. called with child synchronized. |
|
1019 |
* |
|
1020 |
* This subclass uses this hook to immediately revoke any services |
|
1021 |
* being used by this child if it is a BeanContextChild. |
|
1022 |
* |
|
1023 |
* subclasses may envelope this method in order to implement their |
|
1024 |
* own child removal side-effects. |
|
1025 |
*/ |
|
1026 |
||
1027 |
protected void childJustRemovedHook(Object child, BCSChild bcsc) { |
|
1028 |
BCSSChild bcssc = (BCSSChild)bcsc; |
|
1029 |
||
1030 |
bcssc.cleanupReferences(); |
|
1031 |
} |
|
1032 |
||
1033 |
/** |
|
1034 |
* called from setBeanContext to notify a BeanContextChild |
|
1035 |
* to release resources obtained from the nesting BeanContext. |
|
1036 |
* |
|
1037 |
* This method revokes any services obtained from its parent. |
|
1038 |
* |
|
1039 |
* subclasses may envelope this method to implement their own semantics. |
|
1040 |
*/ |
|
1041 |
||
1042 |
protected synchronized void releaseBeanContextResources() { |
|
1043 |
Object[] bcssc; |
|
1044 |
||
1045 |
super.releaseBeanContextResources(); |
|
1046 |
||
1047 |
synchronized(children) { |
|
1048 |
if (children.isEmpty()) return; |
|
1049 |
||
1050 |
bcssc = children.values().toArray(); |
|
1051 |
} |
|
1052 |
||
1053 |
||
1054 |
for (int i = 0; i < bcssc.length; i++) { |
|
1055 |
((BCSSChild)bcssc[i]).revokeAllDelegatedServicesNow(); |
|
1056 |
} |
|
1057 |
||
1058 |
proxy = null; |
|
1059 |
} |
|
1060 |
||
1061 |
/** |
|
1062 |
* called from setBeanContext to notify a BeanContextChild |
|
1063 |
* to allocate resources obtained from the nesting BeanContext. |
|
1064 |
* |
|
1065 |
* subclasses may envelope this method to implement their own semantics. |
|
1066 |
*/ |
|
1067 |
||
1068 |
protected synchronized void initializeBeanContextResources() { |
|
1069 |
super.initializeBeanContextResources(); |
|
1070 |
||
1071 |
BeanContext nbc = getBeanContext(); |
|
1072 |
||
1073 |
if (nbc == null) return; |
|
1074 |
||
1075 |
try { |
|
1076 |
BeanContextServices bcs = (BeanContextServices)nbc; |
|
1077 |
||
1078 |
proxy = new BCSSProxyServiceProvider(bcs); |
|
1079 |
} catch (ClassCastException cce) { |
|
1080 |
// do nothing ... |
|
1081 |
} |
|
1082 |
} |
|
1083 |
||
1084 |
/** |
|
1085 |
* Fires a <tt>BeanContextServiceEvent</tt> notifying of a new service. |
|
19213 | 1086 |
* @param serviceClass the service class |
2 | 1087 |
*/ |
1088 |
protected final void fireServiceAdded(Class serviceClass) { |
|
1089 |
BeanContextServiceAvailableEvent bcssae = new BeanContextServiceAvailableEvent(getBeanContextServicesPeer(), serviceClass); |
|
1090 |
||
1091 |
fireServiceAdded(bcssae); |
|
1092 |
} |
|
1093 |
||
1094 |
/** |
|
1095 |
* Fires a <tt>BeanContextServiceAvailableEvent</tt> indicating that a new |
|
1096 |
* service has become available. |
|
1097 |
* |
|
1098 |
* @param bcssae the <tt>BeanContextServiceAvailableEvent</tt> |
|
1099 |
*/ |
|
1100 |
protected final void fireServiceAdded(BeanContextServiceAvailableEvent bcssae) { |
|
1101 |
Object[] copy; |
|
1102 |
||
1103 |
synchronized (bcsListeners) { copy = bcsListeners.toArray(); } |
|
1104 |
||
1105 |
for (int i = 0; i < copy.length; i++) { |
|
1106 |
((BeanContextServicesListener)copy[i]).serviceAvailable(bcssae); |
|
1107 |
} |
|
1108 |
} |
|
1109 |
||
1110 |
/** |
|
1111 |
* Fires a <tt>BeanContextServiceEvent</tt> notifying of a service being revoked. |
|
1112 |
* |
|
1113 |
* @param bcsre the <tt>BeanContextServiceRevokedEvent</tt> |
|
1114 |
*/ |
|
1115 |
protected final void fireServiceRevoked(BeanContextServiceRevokedEvent bcsre) { |
|
1116 |
Object[] copy; |
|
1117 |
||
1118 |
synchronized (bcsListeners) { copy = bcsListeners.toArray(); } |
|
1119 |
||
1120 |
for (int i = 0; i < copy.length; i++) { |
|
1121 |
((BeanContextServiceRevokedListener)copy[i]).serviceRevoked(bcsre); |
|
1122 |
} |
|
1123 |
} |
|
1124 |
||
1125 |
/** |
|
1126 |
* Fires a <tt>BeanContextServiceRevokedEvent</tt> |
|
1127 |
* indicating that a particular service is |
|
1128 |
* no longer available. |
|
19213 | 1129 |
* @param serviceClass the service class |
1130 |
* @param revokeNow whether or not the event should be revoked now |
|
2 | 1131 |
*/ |
1132 |
protected final void fireServiceRevoked(Class serviceClass, boolean revokeNow) { |
|
1133 |
Object[] copy; |
|
1134 |
BeanContextServiceRevokedEvent bcsre = new BeanContextServiceRevokedEvent(getBeanContextServicesPeer(), serviceClass, revokeNow); |
|
1135 |
||
1136 |
synchronized (bcsListeners) { copy = bcsListeners.toArray(); } |
|
1137 |
||
1138 |
for (int i = 0; i < copy.length; i++) { |
|
1139 |
((BeanContextServicesListener)copy[i]).serviceRevoked(bcsre); |
|
1140 |
} |
|
1141 |
} |
|
1142 |
||
1143 |
/** |
|
1144 |
* called from BeanContextSupport writeObject before it serializes the |
|
1145 |
* children ... |
|
1146 |
* |
|
1147 |
* This class will serialize any Serializable BeanContextServiceProviders |
|
1148 |
* herein. |
|
1149 |
* |
|
1150 |
* subclasses may envelope this method to insert their own serialization |
|
1151 |
* processing that has to occur prior to serialization of the children |
|
1152 |
*/ |
|
1153 |
||
1154 |
protected synchronized void bcsPreSerializationHook(ObjectOutputStream oos) throws IOException { |
|
1155 |
||
1156 |
oos.writeInt(serializable); |
|
1157 |
||
1158 |
if (serializable <= 0) return; |
|
1159 |
||
1160 |
int count = 0; |
|
1161 |
||
1162 |
Iterator i = services.entrySet().iterator(); |
|
1163 |
||
1164 |
while (i.hasNext() && count < serializable) { |
|
1165 |
Map.Entry entry = (Map.Entry)i.next(); |
|
1166 |
BCSSServiceProvider bcsp = null; |
|
1167 |
||
1168 |
try { |
|
1169 |
bcsp = (BCSSServiceProvider)entry.getValue(); |
|
1170 |
} catch (ClassCastException cce) { |
|
1171 |
continue; |
|
1172 |
} |
|
1173 |
||
1174 |
if (bcsp.getServiceProvider() instanceof Serializable) { |
|
1175 |
oos.writeObject(entry.getKey()); |
|
1176 |
oos.writeObject(bcsp); |
|
1177 |
count++; |
|
1178 |
} |
|
1179 |
} |
|
1180 |
||
1181 |
if (count != serializable) |
|
1182 |
throw new IOException("wrote different number of service providers than expected"); |
|
1183 |
} |
|
1184 |
||
1185 |
/** |
|
1186 |
* called from BeanContextSupport readObject before it deserializes the |
|
1187 |
* children ... |
|
1188 |
* |
|
1189 |
* This class will deserialize any Serializable BeanContextServiceProviders |
|
1190 |
* serialized earlier thus making them available to the children when they |
|
1191 |
* deserialized. |
|
1192 |
* |
|
1193 |
* subclasses may envelope this method to insert their own serialization |
|
1194 |
* processing that has to occur prior to serialization of the children |
|
1195 |
*/ |
|
1196 |
||
1197 |
protected synchronized void bcsPreDeserializationHook(ObjectInputStream ois) throws IOException, ClassNotFoundException { |
|
1198 |
||
1199 |
serializable = ois.readInt(); |
|
1200 |
||
1201 |
int count = serializable; |
|
1202 |
||
1203 |
while (count > 0) { |
|
1204 |
services.put(ois.readObject(), ois.readObject()); |
|
1205 |
count--; |
|
1206 |
} |
|
1207 |
} |
|
1208 |
||
1209 |
/** |
|
1210 |
* serialize the instance |
|
1211 |
*/ |
|
1212 |
||
1213 |
private synchronized void writeObject(ObjectOutputStream oos) throws IOException { |
|
1214 |
oos.defaultWriteObject(); |
|
1215 |
||
1216 |
serialize(oos, (Collection)bcsListeners); |
|
1217 |
} |
|
1218 |
||
1219 |
/** |
|
1220 |
* deserialize the instance |
|
1221 |
*/ |
|
1222 |
||
1223 |
private synchronized void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException { |
|
1224 |
||
1225 |
ois.defaultReadObject(); |
|
1226 |
||
1227 |
deserialize(ois, (Collection)bcsListeners); |
|
1228 |
} |
|
1229 |
||
1230 |
||
1231 |
/* |
|
1232 |
* fields |
|
1233 |
*/ |
|
1234 |
||
1235 |
/** |
|
1236 |
* all accesses to the <code> protected transient HashMap services </code> |
|
1237 |
* field should be synchronized on that object |
|
1238 |
*/ |
|
1239 |
protected transient HashMap services; |
|
1240 |
||
1241 |
/** |
|
1242 |
* The number of instances of a serializable <tt>BeanContextServceProvider</tt>. |
|
1243 |
*/ |
|
1244 |
protected transient int serializable = 0; |
|
1245 |
||
1246 |
||
1247 |
/** |
|
1248 |
* Delegate for the <tt>BeanContextServiceProvider</tt>. |
|
1249 |
*/ |
|
1250 |
protected transient BCSSProxyServiceProvider proxy; |
|
1251 |
||
1252 |
||
1253 |
/** |
|
1254 |
* List of <tt>BeanContextServicesListener</tt> objects. |
|
1255 |
*/ |
|
1256 |
protected transient ArrayList bcsListeners; |
|
1257 |
} |