package com.cloudera.flume.reporter.sampler;
import java.io.IOException;
import java.util.Random;
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.util.Clock;
import com.google.common.base.Preconditions;
EventSinkDecorator<S> {
double prob;
Random rand;
super(s);
this.prob = prob;
this.rand = new Random(seed);
}
this(s, prob, Clock.unixTime());
}
@Override
public void append(Event e)
throws IOException {
if (rand.nextDouble() < prob) {
getSink().append(e);
}
}
public static SinkDecoBuilder
builder() {
return new SinkDecoBuilder() {
@Override
public EventSinkDecorator<EventSink>
build(Context context,
String... argv) {
Preconditions.checkArgument(argv.length == 1 || argv.length == 2,
"usage: proabilitySampler(prob[, seed])");
double prob = Double.parseDouble(argv[0]);
long seed = Clock.unixTime();
if (argv.length == 2) {
seed = Long.parseLong(argv[1]);
}
return new ProbabilitySampler<EventSink>(null, prob, seed);
}
};
}
}