package com.cloudera.flume.handlers.debug;
import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;
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;
EventSinkDecorator<S> {
final CountDownLatch latch;
final int pre;
final AtomicInteger precount;
super(s);
this.latch = new CountDownLatch(count);
this.pre = pre;
this.precount = new AtomicInteger(pre);
}
@Override
public void append(Event e)
throws IOException {
if (precount.get() > 0) {
precount.decrementAndGet();
} else {
try {
latch.await();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
super.append(e);
}
latch.countDown();
}
public static SinkDecoBuilder
builder() {
return new SinkDecoBuilder() {
@Override
public EventSinkDecorator<EventSink>
build(Context context,
String... argv) {
Preconditions.checkArgument(argv.length <= 2,
"usage: latch([init=1,[pre=0]])");
int mult = 1;
int pre = 0;
if (argv.length >= 1)
mult = Integer.parseInt(argv[0]);
if (argv.length >= 2)
pre = Integer.parseInt(argv[1]);
return new LatchedDecorator<EventSink>(null, pre, mult);
}
};
}
}