Github user eolivelli commented on a diff in the pull request: https://github.com/apache/zookeeper/pull/582#discussion_r205047955 --- Diff: src/java/main/org/apache/zookeeper/metrics/Counter.java --- @@ -0,0 +1,47 @@ +/** + * 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.metrics; + +/** + * A counter refers to a value which can only increase. + * Usually the value is reset when the process starts. + */ +public interface Counter { + + /** + * Increment the value by one. + */ + public default void inc() { + inc(1); + } + + /** + * Increment the value by a given amount. + * + * @param delta + */ + public void inc(long delta); + + /** + * Get the current value held by the counter. + * + * @return the current value + */ + public long getCurrentValue(); --- End diff -- @lvfangmin done (I did a squash commit, GitHub lost the binding to the code)
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