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Apache HttpComponents Core (non-blocking I/O)
/*
* ====================================================================
* 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
* .
*
*/
package org.apache.http.impl.nio.reactor;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.channels.Channel;
import java.nio.channels.SelectionKey;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.annotation.Contract;
import org.apache.http.nio.reactor.IOSession;
import org.apache.http.nio.reactor.SessionRequest;
import org.apache.http.nio.reactor.SessionRequestCallback;
import org.apache.http.util.Args;
/**
* Default implementation of {@link SessionRequest}.
*
* @since 4.0
*/
@Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL)
public class SessionRequestImpl implements SessionRequest {
private volatile boolean completed;
private volatile SelectionKey key;
private final SocketAddress remoteAddress;
private final SocketAddress localAddress;
private final Object attachment;
private final SessionRequestCallback callback;
private volatile int connectTimeout;
private volatile IOSession session = null;
private volatile IOException exception = null;
public SessionRequestImpl(
final SocketAddress remoteAddress,
final SocketAddress localAddress,
final Object attachment,
final SessionRequestCallback callback) {
super();
Args.notNull(remoteAddress, "Remote address");
this.remoteAddress = remoteAddress;
this.localAddress = localAddress;
this.attachment = attachment;
this.callback = callback;
this.connectTimeout = 0;
}
@Override
public SocketAddress getRemoteAddress() {
return this.remoteAddress;
}
@Override
public SocketAddress getLocalAddress() {
return this.localAddress;
}
@Override
public Object getAttachment() {
return this.attachment;
}
@Override
public boolean isCompleted() {
return this.completed;
}
protected void setKey(final SelectionKey key) {
this.key = key;
}
@Override
public void waitFor() throws InterruptedException {
if (this.completed) {
return;
}
synchronized (this) {
while (!this.completed) {
wait();
}
}
}
@Override
public IOSession getSession() {
synchronized (this) {
return this.session;
}
}
@Override
public IOException getException() {
synchronized (this) {
return this.exception;
}
}
public void completed(final IOSession session) {
Args.notNull(session, "Session");
if (this.completed) {
return;
}
this.completed = true;
synchronized (this) {
this.session = session;
if (this.callback != null) {
this.callback.completed(this);
}
notifyAll();
}
}
public void failed(final IOException exception) {
if (exception == null) {
return;
}
if (this.completed) {
return;
}
this.completed = true;
final SelectionKey key = this.key;
if (key != null) {
key.cancel();
final Channel channel = key.channel();
try {
channel.close();
} catch (final IOException ignore) {}
}
synchronized (this) {
this.exception = exception;
if (this.callback != null) {
this.callback.failed(this);
}
notifyAll();
}
}
public void timeout() {
if (this.completed) {
return;
}
this.completed = true;
final SelectionKey key = this.key;
if (key != null) {
key.cancel();
final Channel channel = key.channel();
if (channel.isOpen()) {
try {
channel.close();
} catch (final IOException ignore) {}
}
}
synchronized (this) {
if (this.callback != null) {
this.callback.timeout(this);
}
}
}
@Override
public int getConnectTimeout() {
return this.connectTimeout;
}
@Override
public void setConnectTimeout(final int timeout) {
if (this.connectTimeout != timeout) {
this.connectTimeout = timeout;
final SelectionKey key = this.key;
if (key != null) {
key.selector().wakeup();
}
}
}
@Override
public void cancel() {
if (this.completed) {
return;
}
this.completed = true;
final SelectionKey key = this.key;
if (key != null) {
key.cancel();
final Channel channel = key.channel();
if (channel.isOpen()) {
try {
channel.close();
} catch (final IOException ignore) {}
}
}
synchronized (this) {
if (this.callback != null) {
this.callback.cancelled(this);
}
notifyAll();
}
}
}