/*
* Copyright 2014 TORCH GmbH
*
* 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 org.graylog2.gelfclient.encoder;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageEncoder;
import java.io.ByteArrayOutputStream;
import java.util.List;
import java.util.zip.GZIPOutputStream;
/**
* A Netty channel handler which compresses messages using a {@link GZIPOutputStream}.
*/
public class GelfCompressionEncoder extends MessageToMessageEncoder<ByteBuf> {
@Override
protected void encode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out) throws Exception {
try (final ByteArrayOutputStream bos = new ByteArrayOutputStream();
final GZIPOutputStream stream = new GZIPOutputStream(bos)) {
stream.write(msg.array());
stream.finish();
out.add(Unpooled.wrappedBuffer(bos.toByteArray()));
}
}
}