/**
* Licensed to Cloudera, Inc. under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Cloudera, Inc. 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 com.cloudera.flume.handlers.batch;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPOutputStream;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.SinkFactory.SinkDecoBuilder;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventImpl;
import com.cloudera.flume.core.EventSink;
import com.cloudera.flume.core.EventSinkDecorator;
import com.cloudera.flume.handlers.hdfs.WriteableEvent;
import com.google.common.base.Preconditions;
/**
* This gzips each event as it passes through the decorator.
*/
public class GzipDecorator<S extends EventSink> extends EventSinkDecorator<S> {
public GzipDecorator(S s) {
super(s);
}
@Override
public void append(Event e) throws IOException {
WriteableEvent we = new WriteableEvent(e);
byte[] bs = we.toBytes();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
GZIPOutputStream gzos = new GZIPOutputStream(baos);
gzos.write(bs);
gzos.close();
Event gze = new EventImpl(new byte[0]);
gze.set(GunzipDecorator.GZDOC, baos.toByteArray());
super.append(gze);
}
public static SinkDecoBuilder builder() {
return new SinkDecoBuilder() {
@Override
public EventSinkDecorator<EventSink> build(Context context,
String... argv) {
Preconditions.checkArgument(argv.length == 0, "usage: gzip");
return new GzipDecorator<EventSink>(null);
}
};
}
}