author | ohair |
Tue, 25 May 2010 15:58:33 -0700 | |
changeset 5506 | 202f599c92aa |
parent 491 | a394684ccfe6 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 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 sun.tracing.dtrace; |
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import java.lang.ref.WeakReference; |
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import java.lang.ref.ReferenceQueue; |
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import java.security.Permission; |
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import java.util.HashSet; |
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class Activation { |
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private SystemResource resource; |
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private int referenceCount; |
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Activation(String moduleName, DTraceProvider[] providers) { |
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SecurityManager security = System.getSecurityManager(); |
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if (security != null) { |
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Permission perm = |
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new RuntimePermission("com.sun.tracing.dtrace.createProvider"); |
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security.checkPermission(perm); |
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} |
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referenceCount = providers.length; |
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for (DTraceProvider p : providers) { |
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p.setActivation(this); |
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} |
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resource = new SystemResource( |
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this, JVM.activate(moduleName, providers)); |
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} |
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void disposeProvider(DTraceProvider p) { |
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if (--referenceCount == 0) { |
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resource.dispose(); |
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} |
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} |
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} |
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/** |
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* The native resource part of an Activation. |
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* |
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* This holds the native handle. |
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* |
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* If the user loses a reference to a set of Providers without disposing them, |
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* and GC determines the Activation is unreachable, then the next |
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* activation or flush call will automatically dispose the unreachable objects |
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* |
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* The SystemResource instances are creating during activation, and |
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* unattached during disposal. When created, they always have a |
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* strong reference to them via the {@code resources} static member. Explicit |
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* {@code dispose} calls will unregister the native resource and remove |
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* references to the SystemResource object. Absent an explicit dispose, |
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* when their associated Activation object becomes garbage, the SystemResource |
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* object will be enqueued on the reference queue and disposed at the |
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* next call to {@code flush}. |
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*/ |
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class SystemResource extends WeakReference<Activation> { |
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private long handle; |
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private static ReferenceQueue<Activation> referenceQueue = |
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referenceQueue = new ReferenceQueue<Activation>(); |
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static HashSet<SystemResource> resources = new HashSet<SystemResource>(); |
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SystemResource(Activation activation, long handle) { |
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super(activation, referenceQueue); |
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this.handle = handle; |
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flush(); |
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resources.add(this); |
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} |
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void dispose() { |
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JVM.dispose(handle); |
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resources.remove(this); |
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handle = 0; |
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} |
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static void flush() { |
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SystemResource resource = null; |
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while ((resource = (SystemResource)referenceQueue.poll()) != null) { |
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if (resource.handle != 0) { |
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resource.dispose(); |
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} |
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} |
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} |
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} |
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