/*
* Copyright © 2014 Cask Data, Inc.
*
* Licensed 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 co.cask.cdap.gateway.router.handlers;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Handles requests to and from a discoverable endpoint.
*/
public class OutboundHandler extends SimpleChannelUpstreamHandler {
private static final Logger LOG = LoggerFactory.getLogger(OutboundHandler.class);
private final Channel inboundChannel;
public OutboundHandler(Channel inboundChannel) {
this.inboundChannel = inboundChannel;
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent event) throws Exception {
// write the channel buffer to inbound channel
ChannelBuffer wrappedMessage = ChannelBuffers.wrappedBuffer((ChannelBuffer) event.getMessage());
Channels.write(inboundChannel, wrappedMessage);
super.messageReceived(ctx, event);
}
@Override
public void channelInterestChanged(ChannelHandlerContext ctx, final ChannelStateEvent e) throws Exception {
inboundChannel.getPipeline().execute(new Runnable() {
@Override
public void run() {
// If outboundChannel is not saturated anymore, continue accepting
// the incoming traffic from the inboundChannel.
if (e.getChannel().isWritable()) {
LOG.trace("Setting inboundChannel readable.");
inboundChannel.setReadable(true);
} else {
// If outboundChannel is saturated, do not read inboundChannel
LOG.trace("Setting inboundChannel non-readable.");
inboundChannel.setReadable(false);
}
}
});
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
LOG.error("Got exception {}", ctx.getChannel(), e.getCause());
HttpRequestHandler.closeOnFlush(e.getChannel());
}
}