/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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 parquet.hadoop.util.counters.mapred;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapred.Counters;
import org.apache.hadoop.mapred.Reporter;
import parquet.hadoop.util.counters.BenchmarkCounter;
import parquet.hadoop.util.counters.CounterLoader;
import parquet.hadoop.util.counters.ICounter;
/**
* Concrete factory for counters in mapred API,
* get a counter using mapred API when the corresponding flag is set, otherwise return a NullCounter
*
* @author Tianshuo Deng
*/
public class MapRedCounterLoader implements CounterLoader {
private Reporter reporter;
private Configuration conf;
public MapRedCounterLoader(Reporter reporter, Configuration conf) {
this.reporter = reporter;
this.conf = conf;
}
public ICounter getCounterByNameAndFlag(String groupName, String counterName, String counterFlag) {
if (conf.getBoolean(counterFlag, true)) {
Counters.Counter counter = reporter.getCounter(groupName, counterName);
if (counter != null) {
return new MapRedCounterAdapter(reporter.getCounter(groupName, counterName));
}
}
return new BenchmarkCounter.NullCounter();
}
}