/*
* ====================================================================
* 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.nio.reactor;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;
import java.nio.channels.CancelledKeyException;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ThreadFactory;
import org.apache.http.annotation.ThreadSafe;
import org.apache.http.nio.reactor.ConnectingIOReactor;
import org.apache.http.nio.reactor.IOReactorException;
import org.apache.http.nio.reactor.IOReactorStatus;
import org.apache.http.nio.reactor.SessionRequest;
import org.apache.http.nio.reactor.SessionRequestCallback;
import org.apache.http.params.HttpParams;
import org.apache.http.util.Asserts;
/**
* Default implementation of {@link ConnectingIOReactor}. This class extends
* {@link AbstractMultiworkerIOReactor} with capability to connect to remote
* hosts.
*
* @since 4.0
*/
@SuppressWarnings("deprecation")
@ThreadSafe // public methods only
public class DefaultConnectingIOReactor extends AbstractMultiworkerIOReactor
implements ConnectingIOReactor {
private final Queue<SessionRequestImpl> requestQueue;
private long lastTimeoutCheck;
/**
* Creates an instance of DefaultConnectingIOReactor with the given configuration.
*
* @param config I/O reactor configuration.
* @param threadFactory the factory to create threads.
* Can be <code>null</code>.
* @throws IOReactorException in case if a non-recoverable I/O error.
*
* @since 4.2
*/
public DefaultConnectingIOReactor(
final IOReactorConfig config,
final ThreadFactory threadFactory) throws IOReactorException {
super(config, threadFactory);
this.requestQueue = new ConcurrentLinkedQueue<SessionRequestImpl>();
this.lastTimeoutCheck = System.currentTimeMillis();
}
/**
* Creates an instance of DefaultConnectingIOReactor with the given configuration.
*
* @param config I/O reactor configuration.
* Can be <code>null</code>.
* @throws IOReactorException in case if a non-recoverable I/O error.
*
* @since 4.2
*/
public DefaultConnectingIOReactor(final IOReactorConfig config) throws IOReactorException {
this(config, null);
}
/**
* Creates an instance of DefaultConnectingIOReactor with default configuration.
*
* @throws IOReactorException in case if a non-recoverable I/O error.
*
* @since 4.2
*/
public DefaultConnectingIOReactor() throws IOReactorException {
this(null, null);
}
/**
* @deprecated (4.2) use {@link DefaultConnectingIOReactor#DefaultConnectingIOReactor(IOReactorConfig, ThreadFactory)}
*/
@Deprecated
public DefaultConnectingIOReactor(
final int workerCount,
final ThreadFactory threadFactory,
final HttpParams params) throws IOReactorException {
this(convert(workerCount, params), threadFactory);
}
/**
* @deprecated (4.2) use {@link DefaultConnectingIOReactor#DefaultConnectingIOReactor(IOReactorConfig)}
*/
@Deprecated
public DefaultConnectingIOReactor(
final int workerCount,
final HttpParams params) throws IOReactorException {
this(convert(workerCount, params), null);
}
@Override
protected void cancelRequests() throws IOReactorException {
SessionRequestImpl request;
while ((request = this.requestQueue.poll()) != null) {
request.cancel();
}
}
@Override
protected void processEvents(final int readyCount) throws IOReactorException {
processSessionRequests();
if (readyCount > 0) {
final Set<SelectionKey> selectedKeys = this.selector.selectedKeys();
for (final SelectionKey key : selectedKeys) {
processEvent(key);
}
selectedKeys.clear();
}
final long currentTime = System.currentTimeMillis();
if ((currentTime - this.lastTimeoutCheck) >= this.selectTimeout) {
this.lastTimeoutCheck = currentTime;
final Set<SelectionKey> keys = this.selector.keys();
processTimeouts(keys);
}
}
private void processEvent(final SelectionKey key) {
try {
if (key.isConnectable()) {
final SocketChannel channel = (SocketChannel) key.channel();
// Get request handle
final SessionRequestHandle requestHandle = (SessionRequestHandle) key.attachment();
final SessionRequestImpl sessionRequest = requestHandle.getSessionRequest();
// Finish connection process
try {
channel.finishConnect();
} catch (final IOException ex) {
sessionRequest.failed(ex);
}
key.cancel();
key.attach(null);
if (!sessionRequest.isCompleted()) {
addChannel(new ChannelEntry(channel, sessionRequest));
} else {
try {
channel.close();
} catch (IOException ignore) {
}
}
}
} catch (final CancelledKeyException ex) {
final SessionRequestHandle requestHandle = (SessionRequestHandle) key.attachment();
key.attach(null);
if (requestHandle != null) {
final SessionRequestImpl sessionRequest = requestHandle.getSessionRequest();
if (sessionRequest != null) {
sessionRequest.cancel();
}
}
}
}
private void processTimeouts(final Set<SelectionKey> keys) {
final long now = System.currentTimeMillis();
for (final SelectionKey key : keys) {
final Object attachment = key.attachment();
if (attachment instanceof SessionRequestHandle) {
final SessionRequestHandle handle = (SessionRequestHandle) key.attachment();
final SessionRequestImpl sessionRequest = handle.getSessionRequest();
final int timeout = sessionRequest.getConnectTimeout();
if (timeout > 0) {
if (handle.getRequestTime() + timeout < now) {
sessionRequest.timeout();
}
}
}
}
}
@Override
public SessionRequest connect(
final SocketAddress remoteAddress,
final SocketAddress localAddress,
final Object attachment,
final SessionRequestCallback callback) {
Asserts.check(this.status.compareTo(IOReactorStatus.ACTIVE) <= 0,
"I/O reactor has been shut down");
final SessionRequestImpl sessionRequest = new SessionRequestImpl(
remoteAddress, localAddress, attachment, callback);
sessionRequest.setConnectTimeout(this.config.getConnectTimeout());
this.requestQueue.add(sessionRequest);
this.selector.wakeup();
return sessionRequest;
}
private void validateAddress(final SocketAddress address) throws UnknownHostException {
if (address == null) {
return;
}
if (address instanceof InetSocketAddress) {
final InetSocketAddress endpoint = (InetSocketAddress) address;
if (endpoint.isUnresolved()) {
throw new UnknownHostException(endpoint.getHostName());
}
}
}
private void processSessionRequests() throws IOReactorException {
SessionRequestImpl request;
while ((request = this.requestQueue.poll()) != null) {
if (request.isCompleted()) {
continue;
}
final SocketChannel socketChannel;
try {
socketChannel = SocketChannel.open();
} catch (final IOException ex) {
throw new IOReactorException("Failure opening socket", ex);
}
try {
validateAddress(request.getLocalAddress());
validateAddress(request.getRemoteAddress());
socketChannel.configureBlocking(false);
prepareSocket(socketChannel.socket());
if (request.getLocalAddress() != null) {
final Socket sock = socketChannel.socket();
sock.setReuseAddress(this.config.isSoReuseAddress());
sock.bind(request.getLocalAddress());
}
final boolean connected = socketChannel.connect(request.getRemoteAddress());
if (connected) {
final ChannelEntry entry = new ChannelEntry(socketChannel, request);
addChannel(entry);
continue;
}
} catch (final IOException ex) {
closeChannel(socketChannel);
request.failed(ex);
return;
}
final SessionRequestHandle requestHandle = new SessionRequestHandle(request);
try {
final SelectionKey key = socketChannel.register(this.selector, SelectionKey.OP_CONNECT,
requestHandle);
request.setKey(key);
} catch (final IOException ex) {
closeChannel(socketChannel);
throw new IOReactorException("Failure registering channel " +
"with the selector", ex);
}
}
}
}