/****************************************************************
* 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.james.imapserver.netty;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.channels.FileChannel;
import org.apache.james.imap.encode.ImapResponseWriter;
import org.apache.james.imap.message.response.Literal;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.DefaultFileRegion;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
import org.jboss.netty.handler.codec.compression.ZlibEncoder;
import org.jboss.netty.handler.ssl.SslHandler;
import org.jboss.netty.handler.stream.ChunkedNioFile;
import org.jboss.netty.handler.stream.ChunkedStream;
/**
* {@link ImapResponseWriter} implementation which writes the data to a
* {@link Channel}
*/
public class ChannelImapResponseWriter implements ImapResponseWriter {
private final Channel channel;
private final boolean zeroCopy;
public ChannelImapResponseWriter(Channel channel) {
this(channel, true);
}
public ChannelImapResponseWriter(Channel channel, boolean zeroCopy) {
this.channel = channel;
this.zeroCopy = zeroCopy;
}
/**
* @see org.apache.james.imap.encode.ImapResponseWriter#write(byte[])
*/
public void write(byte[] buffer) throws IOException {
if (channel.isConnected()) {
channel.write(ChannelBuffers.wrappedBuffer(buffer));
}
}
/**
* @see org.apache.james.imap.encode.ImapResponseWriter#write(org.apache.james.imap.message.response.Literal)
*/
public void write(Literal literal) throws IOException {
if (channel.isConnected()) {
InputStream in = literal.getInputStream();
if (in instanceof FileInputStream && channel.getFactory() instanceof NioServerSocketChannelFactory) {
FileChannel fc = ((FileInputStream) in).getChannel();
// Zero-copy is only possible if no SSL/TLS and no COMPRESS is in place
//
// See JAMES-1305 and JAMES-1306
ChannelPipeline cp = channel.getPipeline();
if (zeroCopy && cp.get(SslHandler.class) == null && cp.get(ZlibEncoder.class) == null ) {
channel.write(new DefaultFileRegion(fc, fc.position(), literal.size()));
} else {
channel.write(new ChunkedNioFile(fc, 8192));
}
} else {
channel.write(new ChunkedStream(literal.getInputStream()));
}
}
}
}