/**
* 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.debug;
import java.io.IOException;
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.google.common.base.Preconditions;
/**
* This sink essentially acts as a pass through decorator, but will throw an
* IOException every n'th append. Useful for testing FailOverSink or Stubborn
* append sinks, or for fault tolerance testing.
*/
public class IntervalFlakeyEventSink<S extends EventSink> extends
EventSinkDecorator<S> {
int interval;
int count = 0;
public IntervalFlakeyEventSink(S s, int i) {
super(s);
Preconditions.checkArgument(i > 0);
this.interval = i;
}
@Override
public void append(Event e) throws IOException, InterruptedException {
count++;
if (count % interval == 0) {
count = 0;
throw new IOException("flakiness struck and caused a failure");
}
super.append(e);
}
public static SinkDecoBuilder builder() {
return new SinkDecoBuilder() {
@Override
public EventSinkDecorator<EventSink> build(Context context,
String... argv) {
Preconditions.checkArgument(argv.length == 1,
"usage: intervalFlakey(interval)");
int interval = Integer.parseInt(argv[0]);
return new IntervalFlakeyEventSink<EventSink>(null, interval);
}
};
}
}