Reduce overhead and accuracy of Dropwizard gauges.
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/*
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* Copyright (C) 2015 Brett Wooldridge
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.zaxxer.hikari.metrics;
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import java.util.concurrent.atomic.AtomicLong;
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import com.zaxxer.hikari.util.ClockSource;
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/**
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*
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* @author Brett Wooldridge
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*/
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public abstract class PoolStats
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{
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private final ClockSource clock;
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private final AtomicLong reloadAt;
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private final long timeoutMs;
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protected volatile int totalConnections;
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protected volatile int idleConnections;
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protected volatile int activeConnections;
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protected volatile int pendingThreads;
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public PoolStats(final long timeoutMs)
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{
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this.timeoutMs = timeoutMs;
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this.reloadAt = new AtomicLong(0);
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this.clock = ClockSource.INSTANCE;
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}
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protected int getTotalConnections()
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{
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if (shouldLoad()) {
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update();
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}
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return totalConnections;
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}
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protected int getIdleConnections()
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{
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if (shouldLoad()) {
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update();
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}
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return idleConnections;
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}
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protected int getActiveConnections()
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{
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if (shouldLoad()) {
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update();
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}
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return activeConnections;
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}
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protected int getPendingThreads()
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{
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if (shouldLoad()) {
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update();
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}
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return pendingThreads;
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}
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protected abstract void update();
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private boolean shouldLoad()
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{
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for (; ; ) {
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final long time = clock.currentTime();
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final long current = reloadAt.get();
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if (current > time) {
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return false;
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}
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if (reloadAt.compareAndSet(current, clock.plusMillis(time, timeoutMs))) {
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return true;
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}
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}
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}
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}
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