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* regarding copyright ownership. The ASF licenses this file *
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* "License"); you may not use this file except in compliance *
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* http://www.apache.org/licenses/LICENSE-2.0 *
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* software distributed under the License is distributed on an *
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package org.apache.james.protocols.netty;
import static org.jboss.netty.channel.Channels.pipeline;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.ChannelUpstreamHandler;
import org.jboss.netty.channel.group.ChannelGroup;
import org.jboss.netty.handler.codec.frame.DelimiterBasedFrameDecoder;
import org.jboss.netty.handler.codec.frame.Delimiters;
import org.jboss.netty.handler.execution.ExecutionHandler;
import org.jboss.netty.handler.stream.ChunkedWriteHandler;
import org.jboss.netty.util.ExternalResourceReleasable;
import org.jboss.netty.util.HashedWheelTimer;
/**
* Abstract base class for {@link ChannelPipelineFactory} implementations
*
*
*/
public abstract class AbstractChannelPipelineFactory implements ChannelPipelineFactory, ExternalResourceReleasable{
public final static int MAX_LINE_LENGTH = 8192;
protected final ConnectionLimitUpstreamHandler connectionLimitHandler;
protected final ConnectionPerIpLimitUpstreamHandler connectionPerIpLimitHandler;
private final HashedWheelTimer timer = new HashedWheelTimer();
private final ChannelGroupHandler groupHandler;
private final int timeout;
private final ExecutionHandler eHandler;
public AbstractChannelPipelineFactory(int timeout, int maxConnections, int maxConnectsPerIp, ChannelGroup channels) {
this(timeout, maxConnections, maxConnectsPerIp, channels, null);
}
public AbstractChannelPipelineFactory(int timeout, int maxConnections, int maxConnectsPerIp, ChannelGroup channels, ExecutionHandler eHandler) {
this.connectionLimitHandler = new ConnectionLimitUpstreamHandler(maxConnections);
this.connectionPerIpLimitHandler = new ConnectionPerIpLimitUpstreamHandler(maxConnectsPerIp);
this.groupHandler = new ChannelGroupHandler(channels);
this.timeout = timeout;
this.eHandler = eHandler;
}
/**
* @see org.jboss.netty.channel.ChannelPipelineFactory#getPipeline()
*/
public ChannelPipeline getPipeline() throws Exception {
// Create a default pipeline implementation.
ChannelPipeline pipeline = pipeline();
pipeline.addLast(HandlerConstants.GROUP_HANDLER, groupHandler);
pipeline.addLast(HandlerConstants.CONNECTION_LIMIT_HANDLER, connectionLimitHandler);
pipeline.addLast(HandlerConstants.CONNECTION_PER_IP_LIMIT_HANDLER, connectionPerIpLimitHandler);
// Add the text line decoder which limit the max line length, don't strip the delimiter and use CRLF as delimiter
pipeline.addLast(HandlerConstants.FRAMER, new DelimiterBasedFrameDecoder(MAX_LINE_LENGTH, false, Delimiters.lineDelimiter()));
// Add the ChunkedWriteHandler to be able to write ChunkInput
pipeline.addLast(HandlerConstants.CHUNK_HANDLER, new ChunkedWriteHandler());
pipeline.addLast(HandlerConstants.TIMEOUT_HANDLER, new TimeoutHandler(timer, timeout));
if (eHandler != null) {
pipeline.addLast(HandlerConstants.EXECUTION_HANDLER, eHandler);
}
pipeline.addLast(HandlerConstants.CORE_HANDLER, createHandler());
return pipeline;
}
/**
* Create the core {@link ChannelUpstreamHandler} to use
*
* @return coreHandeler
*/
protected abstract ChannelUpstreamHandler createHandler();
/*
* (non-Javadoc)
* @see org.jboss.netty.util.ExternalResourceReleasable#releaseExternalResources()
*/
public void releaseExternalResources() {
timer.stop();
}
}