org.apache.hadoop.metrics2.impl.MetricsCollectorImpl.java Source code

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Here is the source code for org.apache.hadoop.metrics2.impl.MetricsCollectorImpl.java

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/**
 * 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 com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Lists;

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 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;
    }
}