Apache ZooKeeper is an open-source server which enables highly reliable distributed coordination.

Apache ZooKeeper Server Source Code files are provided in the source packge (apache-zookeeper-3.7.0.tar.gz). You can download it at Apache ZooKeeper Website.

You can also browse Apache ZooKeeper Server Source Code below:

⏎ org/apache/zookeeper/server/metric/SimpleCounter.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.zookeeper.server.metric;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.zookeeper.metrics.Counter;

public class SimpleCounter extends Metric implements Counter {

    private final String name;
    private final AtomicLong counter = new AtomicLong();

    public SimpleCounter(String name) {
        this.name = name;
    }

    @Override
    public void add(long value) {
        counter.addAndGet(value);
    }

    @Override
    public void reset() {
        counter.set(0);
    }

    public long get() {
        return counter.get();
    }

    @Override
    public Map<String, Object> values() {
        Map<String, Object> m = new LinkedHashMap<String, Object>();
        m.put(name, this.get());
        return m;
    }

}

⏎ org/apache/zookeeper/server/metric/SimpleCounter.java

 

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