/**
* 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.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.SinkFactory.SinkDecoBuilder;
import com.cloudera.flume.core.Event;
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 gunzip's any event that is gzip'ed, otherwise events just pass through.
*/
public class GunzipDecorator<S extends EventSink> extends EventSinkDecorator<S> {
public GunzipDecorator(S s) {
super(s);
}
public final static String GZDOC = "compressGzip";
public static boolean isGzEven(Event e) {
return e.get(GZDOC) != null;
}
@Override
public void append(Event e) throws IOException {
byte[] bs = e.get(GZDOC);
if (bs == null) {
super.append(e);
return;
}
ByteArrayInputStream bais = new ByteArrayInputStream(bs);
GZIPInputStream gzis = new GZIPInputStream(bais);
DataInputStream dis = new DataInputStream(gzis);
WriteableEvent out = new WriteableEvent();
out.readFields(dis);
dis.close();
super.append(out);
}
public static SinkDecoBuilder builder() {
return new SinkDecoBuilder() {
@Override
public EventSinkDecorator<EventSink> build(Context context,
String... argv) {
Preconditions.checkArgument(argv.length == 0, "usage: gunzip");
return new GunzipDecorator<EventSink>(null);
}
};
}
}