diff options
Diffstat (limited to 'src/org/apache/http/impl/conn/tsccm/WaitingThread.java')
| -rw-r--r-- | src/org/apache/http/impl/conn/tsccm/WaitingThread.java | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/src/org/apache/http/impl/conn/tsccm/WaitingThread.java b/src/org/apache/http/impl/conn/tsccm/WaitingThread.java deleted file mode 100644 index a50e11f..0000000 --- a/src/org/apache/http/impl/conn/tsccm/WaitingThread.java +++ /dev/null @@ -1,197 +0,0 @@ -/* - * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/conn/tsccm/WaitingThread.java $ - * $Revision: 649217 $ - * $Date: 2008-04-17 11:32:32 -0700 (Thu, 17 Apr 2008) $ - * - * ==================================================================== - * - * Licensed to the Apache Software Foundation (ASF) under one or more - * contributor license agreements. See the NOTICE file distributed with - * this work for additional information regarding copyright ownership. - * The ASF licenses this file to You under the Apache License, Version 2.0 - * (the "License"); you may not use this file except in compliance with - * the License. You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - * ==================================================================== - * - * This software consists of voluntary contributions made by many - * individuals on behalf of the Apache Software Foundation. For more - * information on the Apache Software Foundation, please see - * <http://www.apache.org/>. - * - */ - -package org.apache.http.impl.conn.tsccm; - - -import java.util.Date; -import java.util.concurrent.locks.Condition; - - -/** - * Represents a thread waiting for a connection. - * This class implements throwaway objects. It is instantiated whenever - * a thread needs to wait. Instances are not re-used, except if the - * waiting thread experiences a spurious wakeup and continues to wait. - * <br/> - * All methods assume external synchronization on the condition - * passed to the constructor. - * Instances of this class do <i>not</i> synchronize access! - * - * @author <a href="mailto:rolandw at apache.org">Roland Weber</a> - */ -public class WaitingThread { - - /** The condition on which the thread is waiting. */ - private final Condition cond; - - /** The route specific pool on which the thread is waiting. */ - //@@@ replace with generic pool interface - private final RouteSpecificPool pool; - - /** The thread that is waiting for an entry. */ - private Thread waiter; - - /** True if this was interrupted. */ - private boolean aborted; - - - /** - * Creates a new entry for a waiting thread. - * - * @param cond the condition for which to wait - * @param pool the pool on which the thread will be waiting, - * or <code>null</code> - */ - public WaitingThread(Condition cond, RouteSpecificPool pool) { - - if (cond == null) { - throw new IllegalArgumentException("Condition must not be null."); - } - - this.cond = cond; - this.pool = pool; - } - - - /** - * Obtains the condition. - * - * @return the condition on which to wait, never <code>null</code> - */ - public final Condition getCondition() { - // not synchronized - return this.cond; - } - - - /** - * Obtains the pool, if there is one. - * - * @return the pool on which a thread is or was waiting, - * or <code>null</code> - */ - public final RouteSpecificPool getPool() { - // not synchronized - return this.pool; - } - - - /** - * Obtains the thread, if there is one. - * - * @return the thread which is waiting, or <code>null</code> - */ - public final Thread getThread() { - // not synchronized - return this.waiter; - } - - - /** - * Blocks the calling thread. - * This method returns when the thread is notified or interrupted, - * if a timeout occurrs, or if there is a spurious wakeup. - * <br/> - * This method assumes external synchronization. - * - * @param deadline when to time out, or <code>null</code> for no timeout - * - * @return <code>true</code> if the condition was satisfied, - * <code>false</code> in case of a timeout. - * Typically, a call to {@link #wakeup} is used to indicate - * that the condition was satisfied. Since the condition is - * accessible outside, this cannot be guaranteed though. - * - * @throws InterruptedException if the waiting thread was interrupted - * - * @see #wakeup - */ - public boolean await(Date deadline) - throws InterruptedException { - - // This is only a sanity check. We cannot synchronize here, - // the lock would not be released on calling cond.await() below. - if (this.waiter != null) { - throw new IllegalStateException - ("A thread is already waiting on this object." + - "\ncaller: " + Thread.currentThread() + - "\nwaiter: " + this.waiter); - } - - if (aborted) - throw new InterruptedException("Operation interrupted"); - - this.waiter = Thread.currentThread(); - - boolean success = false; - try { - if (deadline != null) { - success = this.cond.awaitUntil(deadline); - } else { - this.cond.await(); - success = true; - } - if (aborted) - throw new InterruptedException("Operation interrupted"); - } finally { - this.waiter = null; - } - return success; - - } // await - - - /** - * Wakes up the waiting thread. - * <br/> - * This method assumes external synchronization. - */ - public void wakeup() { - - // If external synchronization and pooling works properly, - // this cannot happen. Just a sanity check. - if (this.waiter == null) { - throw new IllegalStateException - ("Nobody waiting on this object."); - } - - // One condition might be shared by several WaitingThread instances. - // It probably isn't, but just in case: wake all, not just one. - this.cond.signalAll(); - } - - public void interrupt() { - aborted = true; - this.cond.signalAll(); - } - - -} // class WaitingThread |