/*
* 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.internal.app.runtime.procedure;
import co.cask.cdap.api.procedure.ProcedureResponse;
import com.google.common.base.Charsets;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.handler.codec.http.DefaultHttpChunk;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
*
*/
final class HttpResponseWriter implements ProcedureResponse.Writer {
private final Channel channel;
HttpResponseWriter(Channel channel) {
this.channel = channel;
}
@Override
public ProcedureResponse.Writer write(ByteBuffer buffer) throws IOException {
return write(ChannelBuffers.wrappedBuffer(buffer));
}
@Override
public ProcedureResponse.Writer write(byte[] bytes) throws IOException {
return write(ChannelBuffers.wrappedBuffer(bytes));
}
@Override
public ProcedureResponse.Writer write(byte[] bytes, int off, int len) throws IOException {
return write(ChannelBuffers.wrappedBuffer(bytes, off, len));
}
@Override
public ProcedureResponse.Writer write(String content) throws IOException {
return write(Charsets.UTF_8.encode(content));
}
@Override
public void close() throws IOException {
Channels.write(channel, DefaultHttpChunk.LAST_CHUNK).addListener(ChannelFutureListener.CLOSE);
}
private ProcedureResponse.Writer write(ChannelBuffer buffer) throws IOException {
try {
ChannelFuture result = Channels.write(channel, new DefaultHttpChunk(buffer));
result.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
result.await();
if (!result.isSuccess()) {
if (result.isCancelled()) {
throw new IOException("Write operation cancelled.");
}
throw new IOException(result.getCause());
}
} catch (InterruptedException e) {
throw new IOException(e);
}
return this;
}
}