/**
* 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 java.util.Random;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.SourceFactory.SourceBuilder;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventImpl;
import com.cloudera.flume.core.EventSource;
import com.cloudera.util.Clock;
/**
* A synthetic source that just creates random events of specified size and
* returns them.
*
* 'open' resets the source's seed and will generate essentially the same stream
* of events.
*/
public class SynthSource extends EventSource.Base {
static final Logger LOG = LoggerFactory.getLogger(SynthSource.class);
final int size;
final long total;
final long seed;
final Random rand;
long count = 0;
public SynthSource(long count, int size) {
this(count, size, Clock.unixTime());
}
public SynthSource(long count, int size, long seed) {
this.rand = new Random(seed);
this.seed = seed;
this.size = size;
this.total = count;
}
@Override
public void close() throws IOException {
LOG.info("closing SynthSource(" + total + ", " + size + " )");
}
@Override
public Event next() throws IOException {
if (count >= total && total != 0)
return null;// end marker if gotten to count
count++;
byte[] data = new byte[size];
rand.nextBytes(data);
Event e = new EventImpl(data);
updateEventProcessingStats(e);
return e;
}
@Override
public void open() throws IOException {
LOG.info("Resetting count and seed; openingSynthSource(" + total + ", "
+ size + " )");
// resetting the seed
count = 0;
rand.setSeed(seed);
}
public static SourceBuilder builder() {
return new SourceBuilder() {
@Override
public EventSource build(Context ctx, String... argv) {
int size = 150;
long count = 0;
if (argv.length > 2) {
throw new IllegalArgumentException(
"usage: synth([count=0 [,randsize=150]]) // count=0 infinite");
}
if (argv.length >= 1) {
count = Long.parseLong(argv[0]);
}
if (argv.length >= 2)
size = Integer.parseInt(argv[1]);
return new SynthSource(count, size);
}
};
}
}