| // Copyright (C) 2015 The Android Open Source Project |
| // |
| // 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.google.gerrit.metrics; |
| |
| import com.google.gerrit.extensions.registration.RegistrationHandle; |
| |
| /** |
| * Metric whose value increments during the life of the process. |
| * <p> |
| * Suitable uses are "total requests handled", "bytes sent", etc. |
| * Use {@link Description#setRate()} to suggest the monitoring system |
| * should also track the rate of increments if this is of interest. |
| * <p> |
| * For an instantaneous read of a value that can change over time |
| * (e.g. "memory in use") use a {@link CallbackMetric}. |
| */ |
| public abstract class Counter0 implements RegistrationHandle { |
| /** Increment the counter by one event. */ |
| public void increment() { |
| incrementBy(1); |
| } |
| |
| /** |
| * Increment the counter by a specified amount. |
| * |
| * @param value value to increment by, must be >= 0. |
| */ |
| public abstract void incrementBy(long value); |
| } |