/**
* 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.camel.component.netty;
import java.net.ConnectException;
import java.net.InetSocketAddress;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.TimeUnit;
import org.apache.camel.AsyncCallback;
import org.apache.camel.CamelContext;
import org.apache.camel.CamelException;
import org.apache.camel.CamelExchangeException;
import org.apache.camel.Exchange;
import org.apache.camel.NoTypeConversionAvailableException;
import org.apache.camel.impl.DefaultAsyncProducer;
import org.apache.camel.util.CamelLogger;
import org.apache.camel.util.ExchangeHelper;
import org.apache.camel.util.IOHelper;
import org.apache.commons.pool.ObjectPool;
import org.apache.commons.pool.PoolableObjectFactory;
import org.apache.commons.pool.impl.GenericObjectPool;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.group.ChannelGroup;
import org.jboss.netty.channel.group.ChannelGroupFuture;
import org.jboss.netty.channel.group.DefaultChannelGroup;
import org.jboss.netty.channel.socket.DatagramChannelFactory;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class NettyProducer extends DefaultAsyncProducer {
private static final transient Logger LOG = LoggerFactory.getLogger(NettyProducer.class);
private static final ChannelGroup ALL_CHANNELS = new DefaultChannelGroup("NettyProducer");
private CamelContext context;
private NettyConfiguration configuration;
private ChannelFactory channelFactory;
private DatagramChannelFactory datagramChannelFactory;
private ClientPipelineFactory pipelineFactory;
private CamelLogger noReplyLogger;
private ExecutorService bossExecutor;
private ExecutorService workerExecutor;
private ObjectPool<Channel> pool;
public NettyProducer(NettyEndpoint nettyEndpoint, NettyConfiguration configuration) {
super(nettyEndpoint);
this.configuration = configuration;
this.context = this.getEndpoint().getCamelContext();
this.noReplyLogger = new CamelLogger(LOG, configuration.getNoReplyLogLevel());
}
@Override
public NettyEndpoint getEndpoint() {
return (NettyEndpoint) super.getEndpoint();
}
@Override
public boolean isSingleton() {
return true;
}
public CamelContext getContext() {
return context;
}
protected boolean isTcp() {
return configuration.getProtocol().equalsIgnoreCase("tcp");
}
@Override
protected void doStart() throws Exception {
super.doStart();
if (configuration.isProducerPoolEnabled()) {
// setup pool where we want an unbounded pool, which allows the pool to shrink on no demand
GenericObjectPool.Config config = new GenericObjectPool.Config();
config.maxActive = configuration.getProducerPoolMaxActive();
config.minIdle = configuration.getProducerPoolMinIdle();
config.maxIdle = configuration.getProducerPoolMaxIdle();
// we should test on borrow to ensure the channel is still valid
config.testOnBorrow = true;
// only evict channels which are no longer valid
config.testWhileIdle = true;
// run eviction every 30th second
config.timeBetweenEvictionRunsMillis = 30 * 1000L;
config.minEvictableIdleTimeMillis = configuration.getProducerPoolMinEvictableIdle();
config.whenExhaustedAction = GenericObjectPool.WHEN_EXHAUSTED_FAIL;
pool = new GenericObjectPool<Channel>(new NettyProducerPoolableObjectFactory(), config);
if (LOG.isDebugEnabled()) {
LOG.debug("Created NettyProducer pool[maxActive={}, minIdle={}, maxIdle={}, minEvictableIdleTimeMillis={}] -> {}",
new Object[]{config.maxActive, config.minIdle, config.maxIdle, config.minEvictableIdleTimeMillis, pool});
}
} else {
pool = new SharedSingletonObjectPool<Channel>(new NettyProducerPoolableObjectFactory());
if (LOG.isDebugEnabled()) {
LOG.info("Created NettyProducer shared singleton pool -> {}", pool);
}
}
// setup pipeline factory
ClientPipelineFactory factory = configuration.getClientPipelineFactory();
if (factory != null) {
pipelineFactory = factory.createPipelineFactory(this);
} else {
pipelineFactory = new DefaultClientPipelineFactory(this);
}
if (isTcp()) {
setupTCPCommunication();
} else {
setupUDPCommunication();
}
if (!configuration.isLazyChannelCreation()) {
// ensure the connection can be established when we start up
Channel channel = pool.borrowObject();
pool.returnObject(channel);
}
}
@Override
protected void doStop() throws Exception {
LOG.debug("Stopping producer at address: {}", configuration.getAddress());
// close all channels
LOG.trace("Closing {} channels", ALL_CHANNELS.size());
ChannelGroupFuture future = ALL_CHANNELS.close();
future.awaitUninterruptibly();
// and then release other resources
if (channelFactory != null) {
channelFactory.releaseExternalResources();
}
// and then shutdown the thread pools
if (bossExecutor != null) {
context.getExecutorServiceManager().shutdown(bossExecutor);
bossExecutor = null;
}
if (workerExecutor != null) {
context.getExecutorServiceManager().shutdown(workerExecutor);
workerExecutor = null;
}
if (pool != null) {
if (LOG.isDebugEnabled()) {
LOG.debug("Stopping producer with channel pool[active={}, idle={}]", pool.getNumActive(), pool.getNumIdle());
}
pool.close();
pool = null;
}
super.doStop();
}
public boolean process(final Exchange exchange, AsyncCallback callback) {
if (!isRunAllowed()) {
if (exchange.getException() == null) {
exchange.setException(new RejectedExecutionException());
}
callback.done(true);
return true;
}
Object body = NettyPayloadHelper.getIn(getEndpoint(), exchange);
if (body == null) {
noReplyLogger.log("No payload to send for exchange: " + exchange);
callback.done(true);
return true;
}
// if textline enabled then covert to a String which must be used for textline
if (getConfiguration().isTextline()) {
try {
body = NettyHelper.getTextlineBody(body, exchange, getConfiguration().getDelimiter(), getConfiguration().isAutoAppendDelimiter());
} catch (NoTypeConversionAvailableException e) {
exchange.setException(e);
callback.done(true);
return true;
}
}
// set the exchange encoding property
if (getConfiguration().getCharsetName() != null) {
exchange.setProperty(Exchange.CHARSET_NAME, IOHelper.normalizeCharset(getConfiguration().getCharsetName()));
}
if (LOG.isTraceEnabled()) {
LOG.trace("Pool[active={}, idle={}]", pool.getNumActive(), pool.getNumIdle());
}
// get a channel from the pool
Channel existing;
try {
existing = pool.borrowObject();
if (existing != null) {
LOG.trace("Got channel from pool {}", existing);
}
} catch (Exception e) {
exchange.setException(e);
callback.done(true);
return true;
}
// we must have a channel
if (existing == null) {
exchange.setException(new CamelExchangeException("Cannot get channel from pool", exchange));
callback.done(true);
return true;
}
// need to declare as final
final Channel channel = existing;
final AsyncCallback producerCallback = new NettyProducerCallback(channel, callback);
// setup state as attachment on the channel, so we can access the state later when needed
channel.setAttachment(new NettyCamelState(producerCallback, exchange));
// write body
NettyHelper.writeBodyAsync(LOG, channel, null, body, exchange, new ChannelFutureListener() {
public void operationComplete(ChannelFuture channelFuture) throws Exception {
LOG.trace("Operation complete {}", channelFuture);
if (!channelFuture.isSuccess()) {
// no success the set the caused exception and signal callback and break
exchange.setException(channelFuture.getCause());
producerCallback.done(false);
return;
}
// if we do not expect any reply then signal callback to continue routing
if (!configuration.isSync()) {
try {
// should channel be closed after complete?
Boolean close;
if (ExchangeHelper.isOutCapable(exchange)) {
close = exchange.getOut().getHeader(NettyConstants.NETTY_CLOSE_CHANNEL_WHEN_COMPLETE, Boolean.class);
} else {
close = exchange.getIn().getHeader(NettyConstants.NETTY_CLOSE_CHANNEL_WHEN_COMPLETE, Boolean.class);
}
// should we disconnect, the header can override the configuration
boolean disconnect = getConfiguration().isDisconnect();
if (close != null) {
disconnect = close;
}
if (disconnect) {
if (LOG.isTraceEnabled()) {
LOG.trace("Closing channel when complete at address: {}", getEndpoint().getConfiguration().getAddress());
}
NettyHelper.close(channel);
}
} finally {
// signal callback to continue routing
producerCallback.done(false);
}
}
}
});
// continue routing asynchronously
return false;
}
/**
* To get the {@link NettyCamelState} from the given channel.
*/
public NettyCamelState getState(Channel channel) {
return (NettyCamelState) channel.getAttachment();
}
/**
* To remove the {@link NettyCamelState} stored on the channel,
* when no longer needed
*/
public void removeState(Channel channel) {
channel.setAttachment(null);
}
protected void setupTCPCommunication() throws Exception {
if (channelFactory == null) {
bossExecutor = context.getExecutorServiceManager().newCachedThreadPool(this, "NettyTCPBoss");
workerExecutor = context.getExecutorServiceManager().newCachedThreadPool(this, "NettyTCPWorker");
if (configuration.getWorkerCount() <= 0) {
channelFactory = new NioClientSocketChannelFactory(bossExecutor, workerExecutor);
} else {
channelFactory = new NioClientSocketChannelFactory(bossExecutor, workerExecutor, configuration.getWorkerCount());
}
}
}
protected void setupUDPCommunication() throws Exception {
if (datagramChannelFactory == null) {
workerExecutor = context.getExecutorServiceManager().newCachedThreadPool(this, "NettyUDPWorker");
if (configuration.getWorkerCount() <= 0) {
datagramChannelFactory = new NioDatagramChannelFactory(workerExecutor);
} else {
datagramChannelFactory = new NioDatagramChannelFactory(workerExecutor, configuration.getWorkerCount());
}
}
}
protected ChannelFuture openConnection() throws Exception {
ChannelFuture answer;
if (isTcp()) {
// its okay to create a new bootstrap for each new channel
ClientBootstrap clientBootstrap = new ClientBootstrap(channelFactory);
clientBootstrap.setOption("keepAlive", configuration.isKeepAlive());
clientBootstrap.setOption("tcpNoDelay", configuration.isTcpNoDelay());
clientBootstrap.setOption("reuseAddress", configuration.isReuseAddress());
clientBootstrap.setOption("connectTimeoutMillis", configuration.getConnectTimeout());
// set any additional netty options
if (configuration.getOptions() != null) {
for (Map.Entry<String, Object> entry : configuration.getOptions().entrySet()) {
clientBootstrap.setOption(entry.getKey(), entry.getValue());
}
}
// set the pipeline factory, which creates the pipeline for each newly created channels
clientBootstrap.setPipelineFactory(pipelineFactory);
answer = clientBootstrap.connect(new InetSocketAddress(configuration.getHost(), configuration.getPort()));
if (LOG.isDebugEnabled()) {
LOG.debug("Created new TCP client bootstrap connecting to {}:{} with options: {}",
new Object[]{configuration.getHost(), configuration.getPort(), clientBootstrap.getOptions()});
}
return answer;
} else {
// its okay to create a new bootstrap for each new channel
ConnectionlessBootstrap connectionlessClientBootstrap = new ConnectionlessBootstrap(datagramChannelFactory);
connectionlessClientBootstrap.setOption("child.keepAlive", configuration.isKeepAlive());
connectionlessClientBootstrap.setOption("child.tcpNoDelay", configuration.isTcpNoDelay());
connectionlessClientBootstrap.setOption("child.reuseAddress", configuration.isReuseAddress());
connectionlessClientBootstrap.setOption("child.connectTimeoutMillis", configuration.getConnectTimeout());
connectionlessClientBootstrap.setOption("child.broadcast", configuration.isBroadcast());
connectionlessClientBootstrap.setOption("sendBufferSize", configuration.getSendBufferSize());
connectionlessClientBootstrap.setOption("receiveBufferSize", configuration.getReceiveBufferSize());
// set any additional netty options
if (configuration.getOptions() != null) {
for (Map.Entry<String, Object> entry : configuration.getOptions().entrySet()) {
connectionlessClientBootstrap.setOption(entry.getKey(), entry.getValue());
}
}
// set the pipeline factory, which creates the pipeline for each newly created channels
connectionlessClientBootstrap.setPipelineFactory(pipelineFactory);
// bind and store channel so we can close it when stopping
Channel channel = connectionlessClientBootstrap.bind(new InetSocketAddress(0));
ALL_CHANNELS.add(channel);
answer = connectionlessClientBootstrap.connect(new InetSocketAddress(configuration.getHost(), configuration.getPort()));
if (LOG.isDebugEnabled()) {
LOG.debug("Created new UDP client bootstrap connecting to {}:{} with options: {}",
new Object[]{configuration.getHost(), configuration.getPort(), connectionlessClientBootstrap.getOptions()});
}
return answer;
}
}
protected Channel openChannel(ChannelFuture channelFuture) throws Exception {
// blocking for channel to be done
if (LOG.isTraceEnabled()) {
LOG.trace("Waiting for operation to complete {} for {} millis", channelFuture, configuration.getConnectTimeout());
}
// here we need to wait it in other thread
final CountDownLatch channelLatch = new CountDownLatch(1);
channelFuture.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture cf) throws Exception {
channelLatch.countDown();
}
});
try {
channelLatch.await(configuration.getConnectTimeout(), TimeUnit.MILLISECONDS);
} catch (InterruptedException ex) {
throw new CamelException("Interrupted while waiting for " + "connection to "
+ configuration.getAddress());
}
if (!channelFuture.isDone() || !channelFuture.isSuccess()) {
ConnectException cause = new ConnectException("Cannot connect to " + configuration.getAddress());
if (channelFuture.getCause() != null) {
cause.initCause(channelFuture.getCause());
}
throw cause;
}
Channel answer = channelFuture.getChannel();
// to keep track of all channels in use
ALL_CHANNELS.add(answer);
if (LOG.isDebugEnabled()) {
LOG.debug("Creating connector to address: {}", configuration.getAddress());
}
return answer;
}
public NettyConfiguration getConfiguration() {
return configuration;
}
public void setConfiguration(NettyConfiguration configuration) {
this.configuration = configuration;
}
public ChannelFactory getChannelFactory() {
return channelFactory;
}
public void setChannelFactory(ChannelFactory channelFactory) {
this.channelFactory = channelFactory;
}
public ChannelGroup getAllChannels() {
return ALL_CHANNELS;
}
/**
* Callback that ensures the channel is returned to the pool when we are done.
*/
private final class NettyProducerCallback implements AsyncCallback {
private final Channel channel;
private final AsyncCallback callback;
private NettyProducerCallback(Channel channel, AsyncCallback callback) {
this.channel = channel;
this.callback = callback;
}
@Override
public void done(boolean doneSync) {
// put back in pool
try {
LOG.trace("Putting channel back to pool {}", channel);
pool.returnObject(channel);
} catch (Exception e) {
LOG.warn("Error returning channel to pool {}. This exception will be ignored.", channel);
} finally {
// ensure we call the delegated callback
callback.done(doneSync);
}
}
}
/**
* Object factory to create {@link Channel} used by the pool.
*/
private final class NettyProducerPoolableObjectFactory implements PoolableObjectFactory<Channel> {
@Override
public Channel makeObject() throws Exception {
ChannelFuture channelFuture = openConnection();
Channel answer = openChannel(channelFuture);
LOG.trace("Created channel: {}", answer);
return answer;
}
@Override
public void destroyObject(Channel channel) throws Exception {
LOG.trace("Destroying channel: {}", channel);
// noop
}
@Override
public boolean validateObject(Channel channel) {
// we need a connected channel to be valid
boolean answer = channel.isConnected();
LOG.trace("Validating channel: {} -> {}", channel, answer);
return answer;
}
@Override
public void activateObject(Channel channel) throws Exception {
// noop
}
@Override
public void passivateObject(Channel channel) throws Exception {
// noop
}
}
}