/**
* 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.DataInput;
import java.io.DataInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
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 is a pass through that will unbatch batched events or just pass other
* events through to the decorated sink.
*/
public class UnbatchingDecorator<S extends EventSink> extends
EventSinkDecorator<S> {
public UnbatchingDecorator(S s) {
super(s);
}
/**
* if it is not a batch event, pass it through, otherwise, unbatch and pass
* through the events.
*/
@Override
public void append(Event e) throws IOException {
if (!BatchingDecorator.isBatch(e)) {
super.append(e);
return;
}
int sz = ByteBuffer.wrap(e.get(BatchingDecorator.BATCH_SIZE)).getInt();
byte[] data = e.get(BatchingDecorator.BATCH_DATA);
DataInput in = new DataInputStream(new ByteArrayInputStream(data));
for (int i = 0; i < sz; i++) {
WriteableEvent we = new WriteableEvent();
we.readFields(in);
super.append(we);
}
}
public static SinkDecoBuilder builder() {
return new SinkDecoBuilder() {
@Override
public EventSinkDecorator<EventSink> build(Context context,
String... argv) {
Preconditions.checkArgument(argv.length == 0, "usage: unbatch");
return new UnbatchingDecorator<EventSink>(null);
}
};
}
}