/**
* Copyright (c) 2002-2011 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.smack.pipeline.database.event;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.CREATED;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.NO_CONTENT;
import static org.jboss.netty.handler.codec.http.HttpResponseStatus.OK;
import static org.jboss.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import org.jboss.netty.buffer.DynamicChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.handler.codec.http.DefaultHttpResponse;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.neo4j.smack.pipeline.database.ThreadTransactionManagement;
import org.neo4j.smack.serialization.SerializationFactory;
import org.neo4j.smack.serialization.SerializationStrategy;
import org.neo4j.smack.serialization.Serializer;
/**
* Note: There are lots of these instances, keep it as slim as possible to
* keep memory usage down.
*/
public class NettyChannelBackedOutput implements Output {
private SerializationFactory serializationFactory;
private boolean outputStarted;
private Channel channel;
private SerializationStrategy<Object> defaultSerializationStrategy;
private boolean isPersistentConnection;
private ThreadTransactionManagement txManage;
private HttpResponseStatus status;
private Object data;
private String location;
private SerializationStrategy serializationStrategy;
public NettyChannelBackedOutput(SerializationFactory serializationFactory)
{
this.serializationFactory = serializationFactory;
}
@Override
public void created()
{
send(CREATED, null, null);
}
@Override
public void created(Object value)
{
send(CREATED, value, null);
}
@Override
public void createdAt(String location)
{
send(CREATED, null, location);
}
@Override
public void createdAt(String location, Object value)
{
send(CREATED, value, location);
}
@Override
public void ok()
{
send(OK, null, null);
}
@Override
public void ok(Object value)
{
send(OK, value, null);
}
@Override
public void okNoContent()
{
send(NO_CONTENT, null, null);
}
@Override
public void okAt(String location, Object value)
{
send(OK, value, location);
}
@Override
public void notFound()
{
send(NOT_FOUND, null, null);
}
protected boolean started()
{
return outputStarted;
}
public void send(HttpResponseStatus status, Object data, String location)
{
send(status, data, location, defaultSerializationStrategy);
}
public void send(
HttpResponseStatus status,
Object data,
String location,
@SuppressWarnings("rawtypes") SerializationStrategy serializationStrategy)
{
this.status = status;
this.data = data;
this.location = location;
this.serializationStrategy = serializationStrategy;
}
// TODO: Make this garbage free
@SuppressWarnings("unchecked")
protected void flush() {
if (outputStarted)
{
throw new RuntimeException(
"Response has already been sent, can only send once per invocation.");
}
outputStarted = true;
DefaultHttpResponse response = new DefaultHttpResponse(HTTP_1_1, status);
if (location != null)
{
response.addHeader(HttpHeaders.Names.LOCATION, location);
}
if (data == null)
{
response.addHeader(HttpHeaders.Names.CONTENT_LENGTH, 0);
} else
{
// TODO: Hack to get tests green, refactor
// add support for streaming output, and look into how we could
// make this garbage free (eg. reuse output buffers). To do that,
// we probably need to patch netty. It brings this buffer all the
// way down to it's deepest dungeons, and then eventually copies it into
// kernel space. We need to know when that has happened and reuse the buffer.
// Perhaps introduce a ring buffer to rotate used buffers back up here?
final DynamicChannelBuffer content = new DynamicChannelBuffer(
1000);
Serializer serializer = serializationFactory.getSerializer(content);
serializationStrategy.serialize(data, serializer);
serializer.flush();
response.setHeader(HttpHeaders.Names.CONTENT_TYPE, serializer.getContentType().toString());
response.setHeader(HttpHeaders.Names.CONTENT_LENGTH, content.writerIndex());
response.setContent(content);
}
ChannelFuture future = channel.write(response);
if (!isPersistentConnection)
{
try
{
future.await().addListener(ChannelFutureListener.CLOSE);
} catch (InterruptedException e)
{
// TODO: Create specific exception?
throw new RuntimeException(
"Waiting for channel to be done to close it failed.", e);
}
}
}
@SuppressWarnings("unchecked")
protected void reset(Channel channel,
SerializationStrategy<?> serializationStrategy,
boolean isPersistentConnection)
{
this.channel = channel;
this.defaultSerializationStrategy = (SerializationStrategy<Object>) serializationStrategy;
this.isPersistentConnection = isPersistentConnection;
this.outputStarted = false;
this.status = null;
this.data = null;
this.location = null;
this.serializationStrategy = null;
}
//private void writeResponse(Serializer serializer)
}