author | darcy |
Thu, 23 Apr 2015 09:32:35 -0700 | |
changeset 29986 | 97167d851fc4 |
parent 29920 | f81c14f472ab |
child 35786 | 9d26db88aa14 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1996, 2011, 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.net.www.http; |
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import java.io.IOException; |
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import java.io.NotSerializableException; |
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import java.util.ArrayList; |
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import java.util.HashMap; |
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import java.net.URL; |
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import sun.misc.InnocuousThread; |
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/** |
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* A class that implements a cache of idle Http connections for keep-alive |
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* |
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* @author Stephen R. Pietrowicz (NCSA) |
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* @author Dave Brown |
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*/ |
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public class KeepAliveCache |
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extends HashMap<KeepAliveKey, ClientVector> |
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implements Runnable { |
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private static final long serialVersionUID = -2937172892064557949L; |
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/* maximum # keep-alive connections to maintain at once |
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* This should be 2 by the HTTP spec, but because we don't support pipe-lining |
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* a larger value is more appropriate. So we now set a default of 5, and the value |
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* refers to the number of idle connections per destination (in the cache) only. |
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* It can be reset by setting system property "http.maxConnections". |
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*/ |
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static final int MAX_CONNECTIONS = 5; |
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static int result = -1; |
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static int getMaxConnections() { |
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if (result == -1) { |
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result = java.security.AccessController.doPrivileged( |
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new sun.security.action.GetIntegerAction("http.maxConnections", |
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MAX_CONNECTIONS)) |
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.intValue(); |
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if (result <= 0) |
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result = MAX_CONNECTIONS; |
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} |
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return result; |
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} |
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static final int LIFETIME = 5000; |
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private Thread keepAliveTimer = null; |
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/** |
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* Constructor |
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*/ |
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public KeepAliveCache() {} |
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/** |
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* Register this URL and HttpClient (that supports keep-alive) with the cache |
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* @param url The URL contains info about the host and port |
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* @param http The HttpClient to be cached |
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*/ |
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public synchronized void put(final URL url, Object obj, HttpClient http) { |
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boolean startThread = (keepAliveTimer == null); |
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if (!startThread) { |
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if (!keepAliveTimer.isAlive()) { |
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startThread = true; |
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} |
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} |
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if (startThread) { |
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clear(); |
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/* Unfortunately, we can't always believe the keep-alive timeout we got |
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* back from the server. If I'm connected through a Netscape proxy |
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* to a server that sent me a keep-alive |
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* time of 15 sec, the proxy unilaterally terminates my connection |
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* The robustness to get around this is in HttpClient.parseHTTP() |
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*/ |
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final KeepAliveCache cache = this; |
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java.security.AccessController.doPrivileged( |
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new java.security.PrivilegedAction<>() { |
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public Void run() { |
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keepAliveTimer = new InnocuousThread(cache, "Keep-Alive-Timer"); |
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keepAliveTimer.setDaemon(true); |
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keepAliveTimer.setPriority(Thread.MAX_PRIORITY - 2); |
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// Set the context class loader to null in order to avoid |
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// keeping a strong reference to an application classloader. |
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keepAliveTimer.setContextClassLoader(null); |
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keepAliveTimer.start(); |
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return null; |
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} |
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}); |
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} |
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KeepAliveKey key = new KeepAliveKey(url, obj); |
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ClientVector v = super.get(key); |
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if (v == null) { |
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int keepAliveTimeout = http.getKeepAliveTimeout(); |
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v = new ClientVector(keepAliveTimeout > 0? |
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keepAliveTimeout*1000 : LIFETIME); |
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v.put(http); |
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super.put(key, v); |
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} else { |
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v.put(http); |
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} |
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} |
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/* remove an obsolete HttpClient from its VectorCache */ |
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public synchronized void remove (HttpClient h, Object obj) { |
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KeepAliveKey key = new KeepAliveKey(h.url, obj); |
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ClientVector v = super.get(key); |
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if (v != null) { |
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v.remove(h); |
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if (v.empty()) { |
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removeVector(key); |
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} |
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} |
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} |
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/* called by a clientVector thread when all its connections have timed out |
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* and that vector of connections should be removed. |
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*/ |
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synchronized void removeVector(KeepAliveKey k) { |
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super.remove(k); |
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} |
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/** |
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* Check to see if this URL has a cached HttpClient |
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*/ |
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public synchronized HttpClient get(URL url, Object obj) { |
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KeepAliveKey key = new KeepAliveKey(url, obj); |
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ClientVector v = super.get(key); |
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if (v == null) { // nothing in cache yet |
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return null; |
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} |
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return v.get(); |
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} |
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/* Sleeps for an alloted timeout, then checks for timed out connections. |
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* Errs on the side of caution (leave connections idle for a relatively |
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* short time). |
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*/ |
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@Override |
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public void run() { |
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do { |
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try { |
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Thread.sleep(LIFETIME); |
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} catch (InterruptedException e) {} |
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synchronized (this) { |
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/* Remove all unused HttpClients. Starting from the |
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* bottom of the stack (the least-recently used first). |
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* REMIND: It'd be nice to not remove *all* connections |
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* that aren't presently in use. One could have been added |
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* a second ago that's still perfectly valid, and we're |
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* needlessly axing it. But it's not clear how to do this |
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* cleanly, and doing it right may be more trouble than it's |
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* worth. |
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*/ |
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long currentTime = System.currentTimeMillis(); |
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ArrayList<KeepAliveKey> keysToRemove |
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= new ArrayList<>(); |
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for (KeepAliveKey key : keySet()) { |
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ClientVector v = get(key); |
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synchronized (v) { |
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int i; |
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for (i = 0; i < v.size(); i++) { |
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KeepAliveEntry e = v.elementAt(i); |
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if ((currentTime - e.idleStartTime) > v.nap) { |
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HttpClient h = e.hc; |
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h.closeServer(); |
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} else { |
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break; |
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} |
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} |
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v.subList(0, i).clear(); |
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if (v.size() == 0) { |
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keysToRemove.add(key); |
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} |
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} |
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} |
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for (KeepAliveKey key : keysToRemove) { |
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removeVector(key); |
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} |
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} |
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} while (size() > 0); |
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return; |
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} |
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/* |
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* Do not serialize this class! |
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*/ |
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private void writeObject(java.io.ObjectOutputStream stream) |
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throws IOException { |
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throw new NotSerializableException(); |
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} |
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private void readObject(java.io.ObjectInputStream stream) |
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throws IOException, ClassNotFoundException { |
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throw new NotSerializableException(); |
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} |
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} |
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/* FILO order for recycling HttpClients, should run in a thread |
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* to time them out. If > maxConns are in use, block. |
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*/ |
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class ClientVector extends java.util.Stack<KeepAliveEntry> { |
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private static final long serialVersionUID = -8680532108106489459L; |
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// sleep time in milliseconds, before cache clear |
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int nap; |
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ClientVector (int nap) { |
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this.nap = nap; |
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} |
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synchronized HttpClient get() { |
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if (empty()) { |
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return null; |
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} else { |
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// Loop until we find a connection that has not timed out |
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HttpClient hc = null; |
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long currentTime = System.currentTimeMillis(); |
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do { |
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KeepAliveEntry e = pop(); |
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if ((currentTime - e.idleStartTime) > nap) { |
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e.hc.closeServer(); |
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} else { |
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hc = e.hc; |
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} |
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} while ((hc== null) && (!empty())); |
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return hc; |
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} |
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} |
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/* return a still valid, unused HttpClient */ |
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synchronized void put(HttpClient h) { |
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if (size() >= KeepAliveCache.getMaxConnections()) { |
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h.closeServer(); // otherwise the connection remains in limbo |
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} else { |
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push(new KeepAliveEntry(h, System.currentTimeMillis())); |
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} |
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} |
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/* |
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* Do not serialize this class! |
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*/ |
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private void writeObject(java.io.ObjectOutputStream stream) |
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throws IOException { |
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throw new NotSerializableException(); |
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} |
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private void readObject(java.io.ObjectInputStream stream) |
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throws IOException, ClassNotFoundException { |
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throw new NotSerializableException(); |
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} |
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} |
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class KeepAliveKey { |
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private String protocol = null; |
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private String host = null; |
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private int port = 0; |
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private Object obj = null; // additional key, such as socketfactory |
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/** |
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* Constructor |
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* |
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* @param url the URL containing the protocol, host and port information |
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*/ |
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public KeepAliveKey(URL url, Object obj) { |
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this.protocol = url.getProtocol(); |
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this.host = url.getHost(); |
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this.port = url.getPort(); |
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this.obj = obj; |
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} |
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/** |
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* Determine whether or not two objects of this type are equal |
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*/ |
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@Override |
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public boolean equals(Object obj) { |
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if ((obj instanceof KeepAliveKey) == false) |
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return false; |
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KeepAliveKey kae = (KeepAliveKey)obj; |
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return host.equals(kae.host) |
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&& (port == kae.port) |
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&& protocol.equals(kae.protocol) |
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&& this.obj == kae.obj; |
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} |
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/** |
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* The hashCode() for this object is the string hashCode() of |
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* concatenation of the protocol, host name and port. |
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*/ |
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@Override |
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public int hashCode() { |
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String str = protocol+host+port; |
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return this.obj == null? str.hashCode() : |
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str.hashCode() + this.obj.hashCode(); |
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} |
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} |
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class KeepAliveEntry { |
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HttpClient hc; |
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long idleStartTime; |
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KeepAliveEntry(HttpClient hc, long idleStartTime) { |
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this.hc = hc; |
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this.idleStartTime = idleStartTime; |
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} |
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} |