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Counter.java
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Counter.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.bookkeeper.stats;
import java.util.concurrent.TimeUnit;
/**
* Simple stats that require only increment and decrement
* functions on a Long. Metrics like the number of topics, persist queue size
* etc. should use this.
*/
public interface Counter {
/**
* Clear this stat.
*/
void clear();
/**
* Increment the value associated with this stat.
*/
void inc();
/**
* Decrement the value associated with this stat.
*/
void dec();
/**
* Add delta to the value associated with this stat.
* @param delta
*/
void addCount(long delta);
/**
* An operation succeeded with the given eventLatency. Update
* stats to reflect the same
* @param eventLatency The event latency
* @param unit
*/
void addLatency(long eventLatency, TimeUnit unit);
/**
* Get the value associated with this stat.
*/
Long get();
}