| /* |
| * 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. |
| * |
| */ |
| package org.apache.mina.common.support; |
| |
| import org.apache.mina.common.IoFuture; |
| import org.apache.mina.common.IoSession; |
| import org.apache.mina.common.IoFutureListener; |
| |
| import java.util.List; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| |
| /** |
| * A default implementation of {@link org.apache.mina.common.IoFuture}. |
| * |
| * @author The Apache Directory Project (mina-dev@directory.apache.org) |
| */ |
| public class DefaultIoFuture implements IoFuture |
| { |
| private final IoSession session; |
| private final Object lock; |
| private List listeners; |
| private Object result; |
| private boolean ready; |
| |
| |
| /** |
| * Creates a new instance. |
| * |
| * @param session an {@link IoSession} which is associated with this future |
| */ |
| public DefaultIoFuture( IoSession session ) |
| { |
| this.session = session; |
| this.lock = this; |
| } |
| |
| /** |
| * Creates a new instance which uses the specified object as a lock. |
| */ |
| public DefaultIoFuture( IoSession session, Object lock ) |
| { |
| if( lock == null ) |
| { |
| throw new NullPointerException( "lock" ); |
| } |
| this.session = session; |
| this.lock = lock; |
| } |
| |
| public IoSession getSession() |
| { |
| return session; |
| } |
| |
| public Object getLock() |
| { |
| return lock; |
| } |
| |
| public void join() |
| { |
| synchronized( lock ) |
| { |
| while( !ready ) |
| { |
| try |
| { |
| lock.wait(); |
| } |
| catch( InterruptedException e ) |
| { |
| } |
| } |
| } |
| } |
| |
| public boolean join( long timeoutInMillis ) |
| { |
| long startTime = ( timeoutInMillis <= 0 ) ? 0 : System |
| .currentTimeMillis(); |
| long waitTime = timeoutInMillis; |
| |
| synchronized( lock ) |
| { |
| if( ready ) |
| { |
| return ready; |
| } |
| else if( waitTime <= 0 ) |
| { |
| return ready; |
| } |
| |
| for( ;; ) |
| { |
| try |
| { |
| lock.wait( waitTime ); |
| } |
| catch( InterruptedException e ) |
| { |
| } |
| |
| if( ready ) |
| return true; |
| else |
| { |
| waitTime = timeoutInMillis - ( System.currentTimeMillis() - startTime ); |
| if( waitTime <= 0 ) |
| { |
| return ready; |
| } |
| } |
| } |
| } |
| } |
| |
| public boolean isReady() |
| { |
| synchronized( lock ) |
| { |
| return ready; |
| } |
| } |
| |
| /** |
| * Sets the result of the asynchronous operation, and mark it as finished. |
| */ |
| protected void setValue( Object newValue ) |
| { |
| synchronized( lock ) |
| { |
| // Allow only once. |
| if( ready ) |
| { |
| return; |
| } |
| |
| result = newValue; |
| ready = true; |
| lock.notifyAll(); |
| |
| notifyListeners(); |
| } |
| } |
| |
| /** |
| * Returns the result of the asynchronous operation. |
| */ |
| protected Object getValue() |
| { |
| synchronized( lock ) |
| { |
| return result; |
| } |
| } |
| |
| public void addListener( IoFutureListener listener ) |
| { |
| if( listener == null ) |
| { |
| throw new NullPointerException( "listener" ); |
| } |
| |
| synchronized( lock ) |
| { |
| if(listeners == null) |
| { |
| listeners = new ArrayList(); |
| } |
| listeners.add( listener ); |
| if( ready ) |
| { |
| listener.operationComplete( this ); |
| } |
| } |
| } |
| |
| public void removeListener( IoFutureListener listener ) |
| { |
| if( listener == null ) |
| { |
| throw new NullPointerException( "listener" ); |
| } |
| |
| synchronized( lock ) |
| { |
| listeners.remove( listener ); |
| } |
| } |
| |
| private void notifyListeners() |
| { |
| synchronized( lock ) |
| { |
| |
| if(listeners != null) |
| { |
| |
| for( Iterator i = listeners.iterator(); i.hasNext(); ) { |
| ( ( IoFutureListener ) i.next() ).operationComplete( this ); |
| } |
| } |
| } |
| } |
| } |
| |
| |
| |