| /* |
| * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.net.www.http; |
| |
| import java.io.IOException; |
| import java.util.LinkedList; |
| import sun.net.NetProperties; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| |
| /** |
| * This class is used to cleanup any remaining data that may be on a KeepAliveStream |
| * so that the connection can be cached in the KeepAliveCache. |
| * Instances of this class can be used as a FIFO queue for KeepAliveCleanerEntry objects. |
| * Executing this Runnable removes each KeepAliveCleanerEntry from the Queue, reads |
| * the reamining bytes on its KeepAliveStream, and if successful puts the connection in |
| * the KeepAliveCache. |
| * |
| * @author Chris Hegarty |
| */ |
| |
| @SuppressWarnings("serial") // never serialized |
| class KeepAliveStreamCleaner |
| extends LinkedList<KeepAliveCleanerEntry> |
| implements Runnable |
| { |
| // maximum amount of remaining data that we will try to cleanup |
| protected static int MAX_DATA_REMAINING = 512; |
| |
| // maximum amount of KeepAliveStreams to be queued |
| protected static int MAX_CAPACITY = 10; |
| |
| // timeout for both socket and poll on the queue |
| protected static final int TIMEOUT = 5000; |
| |
| // max retries for skipping data |
| private static final int MAX_RETRIES = 5; |
| |
| static { |
| final String maxDataKey = "http.KeepAlive.remainingData"; |
| int maxData = AccessController.doPrivileged( |
| new PrivilegedAction<Integer>() { |
| public Integer run() { |
| return NetProperties.getInteger(maxDataKey, MAX_DATA_REMAINING); |
| }}).intValue() * 1024; |
| MAX_DATA_REMAINING = maxData; |
| |
| final String maxCapacityKey = "http.KeepAlive.queuedConnections"; |
| int maxCapacity = AccessController.doPrivileged( |
| new PrivilegedAction<Integer>() { |
| public Integer run() { |
| return NetProperties.getInteger(maxCapacityKey, MAX_CAPACITY); |
| }}).intValue(); |
| MAX_CAPACITY = maxCapacity; |
| |
| } |
| |
| |
| @Override |
| public boolean offer(KeepAliveCleanerEntry e) { |
| if (size() >= MAX_CAPACITY) |
| return false; |
| |
| return super.offer(e); |
| } |
| |
| @Override |
| public void run() |
| { |
| KeepAliveCleanerEntry kace = null; |
| |
| do { |
| try { |
| synchronized(this) { |
| long before = System.currentTimeMillis(); |
| long timeout = TIMEOUT; |
| while ((kace = poll()) == null) { |
| this.wait(timeout); |
| |
| long after = System.currentTimeMillis(); |
| long elapsed = after - before; |
| if (elapsed > timeout) { |
| /* one last try */ |
| kace = poll(); |
| break; |
| } |
| before = after; |
| timeout -= elapsed; |
| } |
| } |
| |
| if(kace == null) |
| break; |
| |
| KeepAliveStream kas = kace.getKeepAliveStream(); |
| |
| if (kas != null) { |
| synchronized(kas) { |
| HttpClient hc = kace.getHttpClient(); |
| try { |
| if (hc != null && !hc.isInKeepAliveCache()) { |
| int oldTimeout = hc.getReadTimeout(); |
| hc.setReadTimeout(TIMEOUT); |
| long remainingToRead = kas.remainingToRead(); |
| if (remainingToRead > 0) { |
| long n = 0; |
| int retries = 0; |
| while (n < remainingToRead && retries < MAX_RETRIES) { |
| remainingToRead = remainingToRead - n; |
| n = kas.skip(remainingToRead); |
| if (n == 0) |
| retries++; |
| } |
| remainingToRead = remainingToRead - n; |
| } |
| if (remainingToRead == 0) { |
| hc.setReadTimeout(oldTimeout); |
| hc.finished(); |
| } else |
| hc.closeServer(); |
| } |
| } catch (IOException ioe) { |
| hc.closeServer(); |
| } finally { |
| kas.setClosed(); |
| } |
| } |
| } |
| } catch (InterruptedException ie) { } |
| } while (kace != null); |
| } |
| } |