jstorm-core/src/main/java/backtype/storm/metric/api/CountMetric.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 backtype.storm.metric.api;

import backtype.storm.metric.api.IMetric;

public class CountMetric implements IMetric {
    long _value = 0;

    public CountMetric() {
    }

    public void incr() {
        _value++;
    }

    public void incrBy(long incrementBy) {
        _value += incrementBy;
    }

    public Object getValueAndReset() {
        long ret = _value;
        _value = 0;
        return ret;
    }
}