/** * Copyright 2015 Netflix, Inc. * * Licensed 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 com.netflix.spectator.api; /** * Measures the rate of change based on calls to increment. */ public interface Counter extends Meter { /** Update the counter by one. */ void increment(); /** * Update the counter by {@code amount}. * * @param amount * Amount to add to the counter. */ void increment(long amount); /** The cumulative count since this counter was created. */ long count(); }