author | dfuchs |
Mon, 27 Nov 2017 16:40:01 +0000 | |
branch | http-client-branch |
changeset 55892 | 9f345a976249 |
parent 55818 | 725576a6821e |
child 55973 | 4d9b002587db |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2017, 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 jdk.incubator.http; |
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import java.io.IOException; |
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import java.lang.System.Logger.Level; |
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import java.net.InetSocketAddress; |
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import java.nio.ByteBuffer; |
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import java.time.Instant; |
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import java.time.temporal.ChronoUnit; |
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import java.util.ArrayList; |
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import java.util.Collections; |
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import java.util.HashMap; |
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import java.util.Iterator; |
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import java.util.LinkedList; |
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import java.util.List; |
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import java.util.ListIterator; |
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import java.util.Objects; |
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import java.util.Optional; |
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import java.util.concurrent.Flow; |
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import java.util.stream.Collectors; |
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import jdk.incubator.http.internal.common.FlowTube; |
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import jdk.incubator.http.internal.common.Utils; |
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/** |
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* Http 1.1 connection pool. |
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*/ |
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final class ConnectionPool { |
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static final long KEEP_ALIVE = Utils.getIntegerNetProperty( |
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"jdk.httpclient.keepalive.timeout", 1200); // seconds |
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static final boolean DEBUG = Utils.DEBUG; // Revisit: temporary dev flag. |
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final System.Logger debug = Utils.getDebugLogger(this::dbgString, DEBUG); |
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// Pools of idle connections |
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private final HashMap<CacheKey,LinkedList<HttpConnection>> plainPool; |
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private final HashMap<CacheKey,LinkedList<HttpConnection>> sslPool; |
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private final ExpiryList expiryList; |
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private final String dbgTag; // used for debug |
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boolean stopped; |
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/** |
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* Entries in connection pool are keyed by destination address and/or |
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* proxy address: |
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* case 1: plain TCP not via proxy (destination only) |
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* case 2: plain TCP via proxy (proxy only) |
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* case 3: SSL not via proxy (destination only) |
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* case 4: SSL over tunnel (destination and proxy) |
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*/ |
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static class CacheKey { |
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final InetSocketAddress proxy; |
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final InetSocketAddress destination; |
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CacheKey(InetSocketAddress destination, InetSocketAddress proxy) { |
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this.proxy = proxy; |
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this.destination = destination; |
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} |
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@Override |
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public boolean equals(Object obj) { |
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if (obj == null) { |
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return false; |
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} |
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if (getClass() != obj.getClass()) { |
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return false; |
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} |
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final CacheKey other = (CacheKey) obj; |
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if (!Objects.equals(this.proxy, other.proxy)) { |
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return false; |
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} |
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if (!Objects.equals(this.destination, other.destination)) { |
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return false; |
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} |
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return true; |
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} |
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@Override |
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public int hashCode() { |
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return Objects.hash(proxy, destination); |
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} |
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} |
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ConnectionPool(long clientId) { |
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this("ConnectionPool("+clientId+")"); |
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} |
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/** |
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* There should be one of these per HttpClient. |
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*/ |
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private ConnectionPool(String tag) { |
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dbgTag = tag; |
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plainPool = new HashMap<>(); |
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sslPool = new HashMap<>(); |
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expiryList = new ExpiryList(); |
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} |
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final String dbgString() { |
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return dbgTag; |
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} |
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void start() { |
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assert !stopped : "Already stopped"; |
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} |
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|
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static CacheKey cacheKey(InetSocketAddress destination, |
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InetSocketAddress proxy) |
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{ |
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return new CacheKey(destination, proxy); |
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} |
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|
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synchronized HttpConnection getConnection(boolean secure, |
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InetSocketAddress addr, |
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InetSocketAddress proxy) { |
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if (stopped) return null; |
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CacheKey key = new CacheKey(addr, proxy); |
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HttpConnection c = secure ? findConnection(key, sslPool) |
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: findConnection(key, plainPool); |
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//System.out.println ("getConnection returning: " + c); |
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return c; |
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} |
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|
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/** |
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* Returns the connection to the pool. |
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*/ |
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void returnToPool(HttpConnection conn) { |
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returnToPool(conn, Instant.now(), KEEP_ALIVE); |
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} |
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|
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// Called also by whitebox tests |
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void returnToPool(HttpConnection conn, Instant now, long keepAlive) { |
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|
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// Don't call registerCleanupTrigger while holding a lock, |
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// but register it before the connection is added to the pool, |
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// since we don't want to trigger the cleanup if the connection |
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// is not in the pool. |
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CleanupTrigger cleanup = registerCleanupTrigger(conn); |
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|
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// it's possible that cleanup may have been called. |
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synchronized(this) { |
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if (cleanup.isDone()) { |
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return; |
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} else if (stopped) { |
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conn.close(); |
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return; |
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} |
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if (conn instanceof PlainHttpConnection) { |
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putConnection(conn, plainPool); |
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} else { |
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assert conn.isSecure(); |
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putConnection(conn, sslPool); |
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} |
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expiryList.add(conn, now, keepAlive); |
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} |
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//System.out.println("Return to pool: " + conn); |
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} |
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|
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private CleanupTrigger registerCleanupTrigger(HttpConnection conn) { |
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// Connect the connection flow to a pub/sub pair that will take the |
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// connection out of the pool and close it if anything happens |
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// while the connection is sitting in the pool. |
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CleanupTrigger cleanup = new CleanupTrigger(conn); |
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FlowTube flow = conn.getConnectionFlow(); |
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debug.log(Level.DEBUG, "registering %s", cleanup); |
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flow.connectFlows(cleanup, cleanup); |
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return cleanup; |
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} |
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private HttpConnection |
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findConnection(CacheKey key, |
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HashMap<CacheKey,LinkedList<HttpConnection>> pool) { |
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LinkedList<HttpConnection> l = pool.get(key); |
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if (l == null || l.isEmpty()) { |
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return null; |
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} else { |
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HttpConnection c = l.removeFirst(); |
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expiryList.remove(c); |
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return c; |
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} |
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} |
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|
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/* called from cache cleaner only */ |
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private boolean |
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removeFromPool(HttpConnection c, |
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HashMap<CacheKey,LinkedList<HttpConnection>> pool) { |
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//System.out.println("cacheCleaner removing: " + c); |
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assert Thread.holdsLock(this); |
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CacheKey k = c.cacheKey(); |
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List<HttpConnection> l = pool.get(k); |
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if (l == null || l.isEmpty()) { |
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pool.remove(k); |
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return false; |
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} |
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return l.remove(c); |
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} |
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|
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private void |
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putConnection(HttpConnection c, |
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HashMap<CacheKey,LinkedList<HttpConnection>> pool) { |
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CacheKey key = c.cacheKey(); |
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LinkedList<HttpConnection> l = pool.get(key); |
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if (l == null) { |
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l = new LinkedList<>(); |
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pool.put(key, l); |
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} |
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l.add(c); |
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} |
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|
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/** |
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* Purge expired connection and return the number of milliseconds |
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* in which the next connection is scheduled to expire. |
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* If no connections are scheduled to be purged return 0. |
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* @return the delay in milliseconds in which the next connection will |
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* expire. |
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*/ |
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long purgeExpiredConnectionsAndReturnNextDeadline() { |
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if (!expiryList.purgeMaybeRequired()) return 0; |
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return purgeExpiredConnectionsAndReturnNextDeadline(Instant.now()); |
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} |
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|
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// Used for whitebox testing |
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long purgeExpiredConnectionsAndReturnNextDeadline(Instant now) { |
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long nextPurge = 0; |
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|
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// We may be in the process of adding new elements |
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// to the expiry list - but those elements will not |
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// have outlast their keep alive timer yet since we're |
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// just adding them. |
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if (!expiryList.purgeMaybeRequired()) return nextPurge; |
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|
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List<HttpConnection> closelist; |
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synchronized (this) { |
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closelist = expiryList.purgeUntil(now); |
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for (HttpConnection c : closelist) { |
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if (c instanceof PlainHttpConnection) { |
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boolean wasPresent = removeFromPool(c, plainPool); |
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assert wasPresent; |
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} else { |
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boolean wasPresent = removeFromPool(c, sslPool); |
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assert wasPresent; |
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} |
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} |
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nextPurge = now.until( |
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expiryList.nextExpiryDeadline().orElse(now), |
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ChronoUnit.MILLIS); |
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} |
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closelist.forEach(this::close); |
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return nextPurge; |
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} |
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|
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private void close(HttpConnection c) { |
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try { |
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c.close(); |
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} catch (Throwable e) {} // ignore |
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} |
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|
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void stop() { |
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List<HttpConnection> closelist = Collections.emptyList(); |
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try { |
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synchronized (this) { |
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stopped = true; |
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closelist = expiryList.stream() |
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.map(e -> e.connection) |
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.collect(Collectors.toList()); |
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expiryList.clear(); |
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plainPool.clear(); |
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sslPool.clear(); |
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} |
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} finally { |
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closelist.forEach(this::close); |
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} |
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} |
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|
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static final class ExpiryEntry { |
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final HttpConnection connection; |
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final Instant expiry; // absolute time in seconds of expiry time |
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ExpiryEntry(HttpConnection connection, Instant expiry) { |
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this.connection = connection; |
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this.expiry = expiry; |
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} |
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} |
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|
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/** |
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* Manages a LinkedList of sorted ExpiryEntry. The entry with the closer |
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* deadline is at the tail of the list, and the entry with the farther |
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* deadline is at the head. In the most common situation, new elements |
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* will need to be added at the head (or close to it), and expired elements |
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* will need to be purged from the tail. |
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*/ |
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private static final class ExpiryList { |
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private final LinkedList<ExpiryEntry> list = new LinkedList<>(); |
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private volatile boolean mayContainEntries; |
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|
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// A loosely accurate boolean whose value is computed |
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// at the end of each operation performed on ExpiryList; |
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// Does not require synchronizing on the ConnectionPool. |
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boolean purgeMaybeRequired() { |
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return mayContainEntries; |
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} |
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|
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// Returns the next expiry deadline |
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// should only be called while holding a synchronization |
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// lock on the ConnectionPool |
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Optional<Instant> nextExpiryDeadline() { |
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if (list.isEmpty()) return Optional.empty(); |
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else return Optional.of(list.getLast().expiry); |
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} |
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331 |
|
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// should only be called while holding a synchronization |
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// lock on the ConnectionPool |
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void add(HttpConnection conn) { |
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add(conn, Instant.now(), KEEP_ALIVE); |
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} |
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337 |
|
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// Used by whitebox test. |
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void add(HttpConnection conn, Instant now, long keepAlive) { |
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Instant then = now.truncatedTo(ChronoUnit.SECONDS) |
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.plus(keepAlive, ChronoUnit.SECONDS); |
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342 |
|
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// Elements with the farther deadline are at the head of |
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// the list. It's more likely that the new element will |
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// have the farthest deadline, and will need to be inserted |
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// at the head of the list, so we're using an ascending |
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// list iterator to find the right insertion point. |
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ListIterator<ExpiryEntry> li = list.listIterator(); |
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while (li.hasNext()) { |
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ExpiryEntry entry = li.next(); |
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|
351 |
|
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if (then.isAfter(entry.expiry)) { |
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|
353 |
li.previous(); |
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|
354 |
// insert here |
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|
355 |
li.add(new ExpiryEntry(conn, then)); |
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mayContainEntries = true; |
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|
357 |
return; |
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|
358 |
} |
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359 |
} |
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// last (or first) element of list (the last element is |
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// the first when the list is empty) |
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362 |
list.add(new ExpiryEntry(conn, then)); |
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|
363 |
mayContainEntries = true; |
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|
364 |
} |
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|
365 |
|
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366 |
// should only be called while holding a synchronization |
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367 |
// lock on the ConnectionPool |
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368 |
void remove(HttpConnection c) { |
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|
369 |
if (c == null || list.isEmpty()) return; |
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ListIterator<ExpiryEntry> li = list.listIterator(); |
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371 |
while (li.hasNext()) { |
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ExpiryEntry e = li.next(); |
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if (e.connection.equals(c)) { |
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li.remove(); |
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mayContainEntries = !list.isEmpty(); |
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376 |
return; |
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|
377 |
} |
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378 |
} |
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379 |
} |
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380 |
|
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381 |
// should only be called while holding a synchronization |
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|
382 |
// lock on the ConnectionPool. |
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|
383 |
// Purge all elements whose deadline is before now (now included). |
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List<HttpConnection> purgeUntil(Instant now) { |
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if (list.isEmpty()) return Collections.emptyList(); |
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386 |
|
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List<HttpConnection> closelist = new ArrayList<>(); |
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388 |
|
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// elements with the closest deadlines are at the tail |
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// of the queue, so we're going to use a descending iterator |
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// to remove them, and stop when we find the first element |
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392 |
// that has not expired yet. |
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393 |
Iterator<ExpiryEntry> li = list.descendingIterator(); |
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394 |
while (li.hasNext()) { |
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ExpiryEntry entry = li.next(); |
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// use !isAfter instead of isBefore in order to |
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// remove the entry if its expiry == now |
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398 |
if (!entry.expiry.isAfter(now)) { |
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399 |
li.remove(); |
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400 |
HttpConnection c = entry.connection; |
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401 |
closelist.add(c); |
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402 |
} else break; // the list is sorted |
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403 |
} |
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mayContainEntries = !list.isEmpty(); |
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405 |
return closelist; |
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|
406 |
} |
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|
407 |
|
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// should only be called while holding a synchronization |
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409 |
// lock on the ConnectionPool |
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410 |
java.util.stream.Stream<ExpiryEntry> stream() { |
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411 |
return list.stream(); |
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412 |
} |
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|
413 |
|
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414 |
// should only be called while holding a synchronization |
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415 |
// lock on the ConnectionPool |
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416 |
void clear() { |
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|
417 |
list.clear(); |
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|
418 |
mayContainEntries = false; |
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|
419 |
} |
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420 |
} |
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|
421 |
|
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422 |
void cleanup(HttpConnection c, Throwable error) { |
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|
423 |
debug.log(Level.DEBUG, |
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|
424 |
"%s : ConnectionPool.cleanup(%s)", |
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425 |
String.valueOf(c.getConnectionFlow()), |
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|
426 |
error); |
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|
427 |
synchronized(this) { |
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|
428 |
if (c instanceof PlainHttpConnection) { |
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|
429 |
removeFromPool(c, plainPool); |
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|
430 |
} else { |
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|
431 |
assert c.isSecure(); |
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|
432 |
removeFromPool(c, sslPool); |
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|
433 |
} |
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|
434 |
expiryList.remove(c); |
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|
435 |
} |
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|
436 |
c.close(); |
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|
437 |
} |
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|
438 |
|
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|
439 |
/** |
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440 |
* An object that subscribes to the flow while the connection is in |
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|
441 |
* the pool. Anything that comes in will cause the connection to be closed |
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|
442 |
* and removed from the pool. |
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|
443 |
*/ |
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|
444 |
private final class CleanupTrigger implements |
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|
445 |
FlowTube.TubeSubscriber, FlowTube.TubePublisher, |
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|
446 |
Flow.Subscription { |
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|
447 |
|
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|
448 |
private final HttpConnection connection; |
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|
449 |
private volatile boolean done; |
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|
450 |
|
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451 |
public CleanupTrigger(HttpConnection connection) { |
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|
452 |
this.connection = connection; |
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|
453 |
} |
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|
454 |
|
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|
455 |
public boolean isDone() { return done;} |
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|
456 |
|
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|
457 |
private void triggerCleanup(Throwable error) { |
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|
458 |
done = true; |
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|
459 |
cleanup(connection, error); |
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|
460 |
} |
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|
461 |
|
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|
462 |
@Override public void request(long n) {} |
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|
463 |
@Override public void cancel() {} |
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|
464 |
|
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|
465 |
@Override |
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|
466 |
public void onSubscribe(Flow.Subscription subscription) { |
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|
467 |
subscription.request(1); |
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|
468 |
} |
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|
469 |
@Override |
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|
470 |
public void onError(Throwable error) { triggerCleanup(error); } |
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|
471 |
@Override |
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|
472 |
public void onComplete() { triggerCleanup(null); } |
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|
473 |
@Override |
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|
474 |
public void onNext(List<ByteBuffer> item) { |
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|
475 |
triggerCleanup(new IOException("Data received while in pool")); |
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changeset
|
476 |
} |
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|
477 |
|
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|
478 |
@Override |
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|
479 |
public void subscribe(Flow.Subscriber<? super List<ByteBuffer>> subscriber) { |
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changeset
|
480 |
subscriber.onSubscribe(this); |
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changeset
|
481 |
} |
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|
482 |
|
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|
483 |
@Override |
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|
484 |
public String toString() { |
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|
485 |
return "CleanupTrigger(" + connection.getConnectionFlow() + ")"; |
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|
486 |
} |
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changeset
|
487 |
|
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changeset
|
488 |
} |
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|
489 |
|
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changeset
|
490 |
} |