/**
* 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.reporter.aggregator;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicLong;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.ReportTestingContext;
import com.cloudera.flume.conf.SinkFactory.SinkBuilder;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventSink;
import com.cloudera.flume.reporter.ReportEvent;
import com.cloudera.flume.reporter.ReportManager;
import com.google.common.base.Preconditions;
/**
* This just counts the number of entries appended.
*/
public class CounterSink extends EventSink.Base {
static final Logger LOG = LoggerFactory.getLogger(CounterSink.class);
AtomicLong cnt;
String name;
boolean isOpen = false;
public CounterSink(String name) {
this.name = name;
this.cnt = new AtomicLong();
}
@Override
public void append(Event e) throws IOException, InterruptedException {
Preconditions.checkState(isOpen,
"Attempting to append to a Counter that is not open!");
cnt.incrementAndGet();
super.append(e);
}
@Override
public void close() throws IOException, InterruptedException {
isOpen = false;
LOG.info(name + " closed, counted " + cnt + " events");
LOG.info("report: " + getMetrics().toText());
}
@Override
public void open() throws IOException, InterruptedException {
Preconditions.checkState(!isOpen);
isOpen = true;
cnt = new AtomicLong();
LOG.info("CounterSink " + name + " opened");
}
@Override
public String getName() {
return name;
}
@Override
public ReportEvent getMetrics() {
ReportEvent re = super.getMetrics();
re.setLongMetric(name, cnt.get());
return re;
}
@Deprecated
@Override
public ReportEvent getReport() {
ReportEvent re = super.getReport();
re.setLongMetric(name, cnt.get());
return re;
}
public long getCount() {
return cnt.get();
}
public static SinkBuilder builder() {
return new SinkBuilder() {
@Override
public EventSink build(Context context, String... argv) {
if (argv.length != 1) {
throw new IllegalArgumentException("need only a name argument");
}
EventSink snk = new CounterSink(argv[0]);
if (context.getValue(ReportTestingContext.TESTING_REPORTS) != null) {
ReportManager.get().add(snk);
}
return snk;
}
};
}
}