/**
* 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.history;
import java.io.IOException;
import java.util.ArrayList;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.FlumeConfiguration;
import com.cloudera.flume.conf.SinkFactory.SinkBuilder;
import com.cloudera.flume.core.EventSink;
import com.cloudera.flume.handlers.rolling.Tagger;
import com.cloudera.flume.reporter.ReportEvent;
import com.cloudera.flume.reporter.aggregator.CounterSink;
import com.cloudera.flume.reporter.charts.ChartPackage;
import com.cloudera.util.Pair;
import com.google.common.base.Preconditions;
/**
* This counts elements that are appended in each epoch.
*/
public class CountHistoryReporter extends ScheduledHistoryReporter<CounterSink> {
public CountHistoryReporter(String name, long maxAge) {
this(name, maxAge, new DumbTagger());
}
public CountHistoryReporter(String name, long maxAge, Tagger t) {
super(name, maxAge, FlumeConfiguration.get().getHistoryMaxLength(), t);
}
@Override
public CounterSink newSink(Tagger format) throws IOException {
return new CounterSink(format.newTag());
}
/**
* TODO make not use legacy html report
*/
@Override
public ReportEvent getMetrics() {
ArrayList<Pair<Long, Long>> list = new ArrayList<Pair<Long, Long>>(
getHistory().size());
for (Pair<Long, CounterSink> p : getHistory()) {
list.add(new Pair<Long, Long>(p.getLeft(), p.getRight().getCount()));
}
String report = ChartPackage.createTimelineGen().generate(list);
return ReportEvent.createLegacyHtmlReport(name, report);
}
public static SinkBuilder builder() {
return new SinkBuilder() {
@Override
public EventSink build(Context context, String... argv) {
Preconditions.checkArgument(argv.length <= 2,
"usage: counterHistory(name[, period_ms])");
String name = argv[0];
long period = FlumeConfiguration.get().getHistoryDefaultPeriod();
if (argv.length == 2) {
period = Integer.parseInt(argv[1]);
}
EventSink snk = new CountHistoryReporter(name, period);
return snk;
}
};
}
}