hadoop MetricsCollectorImpl 源码
haddop MetricsCollectorImpl 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/impl/MetricsCollectorImpl.java
/**
* 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 org.apache.hadoop.metrics2.impl;
import java.util.Iterator;
import java.util.List;
import org.apache.hadoop.classification.VisibleForTesting;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.metrics2.MetricsInfo;
import org.apache.hadoop.metrics2.MetricsCollector;
import org.apache.hadoop.metrics2.MetricsFilter;
import org.apache.hadoop.util.Lists;
import static org.apache.hadoop.metrics2.lib.Interns.*;
@InterfaceAudience.Private
@VisibleForTesting
public class MetricsCollectorImpl implements MetricsCollector,
Iterable<MetricsRecordBuilderImpl> {
private final List<MetricsRecordBuilderImpl> rbs = Lists.newArrayList();
private MetricsFilter recordFilter, metricFilter;
@Override
public MetricsRecordBuilderImpl addRecord(MetricsInfo info) {
boolean acceptable = recordFilter == null ||
recordFilter.accepts(info.name());
MetricsRecordBuilderImpl rb = new MetricsRecordBuilderImpl(this, info,
recordFilter, metricFilter, acceptable);
if (acceptable) rbs.add(rb);
return rb;
}
@Override
public MetricsRecordBuilderImpl addRecord(String name) {
return addRecord(info(name, name +" record"));
}
public List<MetricsRecordImpl> getRecords() {
List<MetricsRecordImpl> recs = Lists.newArrayListWithCapacity(rbs.size());
for (MetricsRecordBuilderImpl rb : rbs) {
MetricsRecordImpl mr = rb.getRecord();
if (mr != null) {
recs.add(mr);
}
}
return recs;
}
@Override
public Iterator<MetricsRecordBuilderImpl> iterator() {
return rbs.iterator();
}
@InterfaceAudience.Private
public void clear() { rbs.clear(); }
MetricsCollectorImpl setRecordFilter(MetricsFilter rf) {
recordFilter = rf;
return this;
}
MetricsCollectorImpl setMetricFilter(MetricsFilter mf) {
metricFilter = mf;
return this;
}
}
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