gobblin.metrics.InnerCounter.java Source code

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Here is the source code for gobblin.metrics.InnerCounter.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 gobblin.metrics;

import java.lang.ref.WeakReference;

import com.codahale.metrics.Counter;
import com.google.common.base.Optional;

import gobblin.metrics.metric.InnerMetric;

/**
 * Implementation of {@link InnerMetric} for {@link Counter}.
 */
public class InnerCounter extends Counter implements InnerMetric {
    protected final String name;
    protected final Tagged tagged;
    protected final Optional<ContextAwareCounter> parentCounter;
    private final WeakReference<ContextAwareCounter> contextAwareCounter;

    public InnerCounter(MetricContext context, String name, ContextAwareCounter counter) {
        this.tagged = new Tagged();
        this.name = name;

        Optional<MetricContext> parentContext = context.getParent();
        if (parentContext.isPresent()) {
            this.parentCounter = Optional.fromNullable(parentContext.get().contextAwareCounter(name));
        } else {
            this.parentCounter = Optional.absent();
        }

        this.contextAwareCounter = new WeakReference<>(counter);
    }

    @Override
    public void inc(long n) {
        super.inc(n);
        if (this.parentCounter.isPresent()) {
            this.parentCounter.get().inc(n);
        }
    }

    @Override
    public void dec(long n) {
        super.dec(n);
        if (this.parentCounter.isPresent()) {
            this.parentCounter.get().dec(n);
        }
    }

    public String getName() {
        return this.name;
    }

    @Override
    public ContextAwareMetric getContextAwareMetric() {
        return this.contextAwareCounter.get();
    }
}