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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 | } | ||