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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.net.www.http; | |
| 27 | + | |
| 28 | +import java.io.*; | |
| 29 | +import sun.net.ProgressSource; | |
| 30 | +import sun.net.www.MeteredStream; | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * A stream that has the property of being able to be kept alive for | |
| 34 | + * multiple downloads from the same server. | |
| 35 | + * | |
| 36 | + * @author Stephen R. Pietrowicz (NCSA) | |
| 37 | + * @author Dave Brown | |
| 38 | + */ | |
| 39 | +public | |
| 40 | +class KeepAliveStream extends MeteredStream implements Hurryable { | |
| 41 | + | |
| 42 | + // instance variables | |
| 43 | + HttpClient hc; | |
| 44 | + | |
| 45 | + boolean hurried; | |
| 46 | + | |
| 47 | + // has this KeepAliveStream been put on the queue for asynchronous cleanup. | |
| 48 | + protected boolean queuedForCleanup = false; | |
| 49 | + | |
| 50 | + private static final KeepAliveStreamCleaner queue = new KeepAliveStreamCleaner(); | |
| 51 | + private static Thread cleanerThread; // null | |
| 52 | + | |
| 53 | + /** | |
| 54 | + * Constructor | |
| 55 | + */ | |
| 56 | + public KeepAliveStream(InputStream is, ProgressSource pi, long expected, HttpClient hc) { | |
| 57 | + super(is, pi, expected); | |
| 58 | + this.hc = hc; | |
| 59 | + } | |
| 60 | + | |
| 61 | + /** | |
| 62 | + * Attempt to cache this connection | |
| 63 | + */ | |
| 64 | + public void close() throws IOException { | |
| 65 | + // If the inputstream is closed already, just return. | |
| 66 | + if (closed) { | |
| 67 | + return; | |
| 68 | + } | |
| 69 | + | |
| 70 | + // If this stream has already been queued for cleanup. | |
| 71 | + if (queuedForCleanup) { | |
| 72 | + return; | |
| 73 | + } | |
| 74 | + | |
| 75 | + // Skip past the data that's left in the Inputstream because | |
| 76 | + // some sort of error may have occurred. | |
| 77 | + // Do this ONLY if the skip won't block. The stream may have | |
| 78 | + // been closed at the beginning of a big file and we don't want | |
| 79 | + // to hang around for nothing. So if we can't skip without blocking | |
| 80 | + // we just close the socket and, therefore, terminate the keepAlive | |
| 81 | + // NOTE: Don't close super class | |
| 82 | + try { | |
| 83 | + if (expected > count) { | |
| 84 | + long nskip = (long) (expected - count); | |
| 85 | + if (nskip <= available()) { | |
| 86 | + long n = 0; | |
| 87 | + while (n < nskip) { | |
| 88 | + nskip = nskip - n; | |
| 89 | + n = skip(nskip); | |
| 90 | + } | |
| 91 | + } else if (expected <= KeepAliveStreamCleaner.MAX_DATA_REMAINING && !hurried) { | |
| 92 | + //put this KeepAliveStream on the queue so that the data remaining | |
| 93 | + //on the socket can be cleanup asyncronously. | |
| 94 | + queueForCleanup(new KeepAliveCleanerEntry(this, hc)); | |
| 95 | + } else { | |
| 96 | + hc.closeServer(); | |
| 97 | + } | |
| 98 | + } | |
| 99 | + if (!closed && !hurried && !queuedForCleanup) { | |
| 100 | + hc.finished(); | |
| 101 | + } | |
| 102 | + } finally { | |
| 103 | + if (pi != null) | |
| 104 | + pi.finishTracking(); | |
| 105 | + | |
| 106 | + if (!queuedForCleanup) { | |
| 107 | + // nulling out the underlying inputstream as well as | |
| 108 | + // httpClient to let gc collect the memories faster | |
| 109 | + in = null; | |
| 110 | + hc = null; | |
| 111 | + closed = true; | |
| 112 | + } | |
| 113 | + } | |
| 114 | + } | |
| 115 | + | |
| 116 | + /* we explicitly do not support mark/reset */ | |
| 117 | + | |
| 118 | + public boolean markSupported() { | |
| 119 | + return false; | |
| 120 | + } | |
| 121 | + | |
| 122 | + public void mark(int limit) {} | |
| 123 | + | |
| 124 | + public void reset() throws IOException { | |
| 125 | + throw new IOException("mark/reset not supported"); | |
| 126 | + } | |
| 127 | + | |
| 128 | + public synchronized boolean hurry() { | |
| 129 | + try { | |
| 130 | + /* CASE 0: we're actually already done */ | |
| 131 | + if (closed || count >= expected) { | |
| 132 | + return false; | |
| 133 | + } else if (in.available() < (expected - count)) { | |
| 134 | + /* CASE I: can't meet the demand */ | |
| 135 | + return false; | |
| 136 | + } else { | |
| 137 | + /* CASE II: fill our internal buffer | |
| 138 | + * Remind: possibly check memory here | |
| 139 | + */ | |
| 140 | + int size = (int) (expected - count); | |
| 141 | + byte[] buf = new byte[size]; | |
| 142 | + DataInputStream dis = new DataInputStream(in); | |
| 143 | + dis.readFully(buf); | |
| 144 | + in = new ByteArrayInputStream(buf); | |
| 145 | + hurried = true; | |
| 146 | + return true; | |
| 147 | + } | |
| 148 | + } catch (IOException e) { | |
| 149 | + // e.printStackTrace(); | |
| 150 | + return false; | |
| 151 | + } | |
| 152 | + } | |
| 153 | + | |
| 154 | + private static void queueForCleanup(KeepAliveCleanerEntry kace) { | |
| 155 | + synchronized(queue) { | |
| 156 | + if(!kace.getQueuedForCleanup()) { | |
| 157 | + if (!queue.offer(kace)) { | |
| 158 | + kace.getHttpClient().closeServer(); | |
| 159 | + return; | |
| 160 | + } | |
| 161 | + | |
| 162 | + kace.setQueuedForCleanup(); | |
| 163 | + queue.notifyAll(); | |
| 164 | + } | |
| 165 | + | |
| 166 | + boolean startCleanupThread = (cleanerThread == null); | |
| 167 | + if (!startCleanupThread) { | |
| 168 | + if (!cleanerThread.isAlive()) { | |
| 169 | + startCleanupThread = true; | |
| 170 | + } | |
| 171 | + } | |
| 172 | + | |
| 173 | + if (startCleanupThread) { | |
| 174 | + java.security.AccessController.doPrivileged( | |
| 175 | + new java.security.PrivilegedAction<Void>() { | |
| 176 | + public Void run() { | |
| 177 | + // We want to create the Keep-Alive-SocketCleaner in the | |
| 178 | + // system threadgroup | |
| 179 | + ThreadGroup grp = Thread.currentThread().getThreadGroup(); | |
| 180 | + ThreadGroup parent = null; | |
| 181 | + while ((parent = grp.getParent()) != null) { | |
| 182 | + grp = parent; | |
| 183 | + } | |
| 184 | + | |
| 185 | + cleanerThread = new Thread(grp, queue, "Keep-Alive-SocketCleaner"); | |
| 186 | + cleanerThread.setDaemon(true); | |
| 187 | + cleanerThread.setPriority(Thread.MAX_PRIORITY - 2); | |
| 188 | + // Set the context class loader to null in order to avoid | |
| 189 | + // keeping a strong reference to an application classloader. | |
| 190 | + cleanerThread.setContextClassLoader(null); | |
| 191 | + cleanerThread.start(); | |
| 192 | + return null; | |
| 193 | + } | |
| 194 | + }); | |
| 195 | + } | |
| 196 | + } // queue | |
| 197 | + } | |
| 198 | + | |
| 199 | + protected long remainingToRead() { | |
| 200 | + return expected - count; | |
| 201 | + } | |
| 202 | + | |
| 203 | + protected void setClosed() { | |
| 204 | + in = null; | |
| 205 | + hc = null; | |
| 206 | + closed = true; | |
| 207 | + } | |
| 208 | +} | |
| 209 | + | |
| 210 | + | |
| 211 | +class KeepAliveCleanerEntry | |
| 212 | +{ | |
| 213 | + KeepAliveStream kas; | |
| 214 | + HttpClient hc; | |
| 215 | + | |
| 216 | + public KeepAliveCleanerEntry(KeepAliveStream kas, HttpClient hc) { | |
| 217 | + this.kas = kas; | |
| 218 | + this.hc = hc; | |
| 219 | + } | |
| 220 | + | |
| 221 | + protected KeepAliveStream getKeepAliveStream() { | |
| 222 | + return kas; | |
| 223 | + } | |
| 224 | + | |
| 225 | + protected HttpClient getHttpClient() { | |
| 226 | + return hc; | |
| 227 | + } | |
| 228 | + | |
| 229 | + protected void setQueuedForCleanup() { | |
| 230 | + kas.queuedForCleanup = true; | |
| 231 | + } | |
| 232 | + | |
| 233 | + protected boolean getQueuedForCleanup() { | |
| 234 | + return kas.queuedForCleanup; | |
| 235 | + } | |
| 236 | + | |
| 237 | +} | |