/
PoolStats.java
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/
PoolStats.java
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/*
* Copyright (C) 2015 Brett Wooldridge
*
* 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.zaxxer.hikari.metrics;
import static com.zaxxer.hikari.util.ClockSource.currentTime;
import static com.zaxxer.hikari.util.ClockSource.plusMillis;
import java.util.concurrent.atomic.AtomicLong;
/**
*
* @author Brett Wooldridge
*/
public abstract class PoolStats
{
private final AtomicLong reloadAt;
private final long timeoutMs;
protected volatile int totalConnections;
protected volatile int idleConnections;
protected volatile int activeConnections;
protected volatile int pendingThreads;
protected volatile int maxConnections;
protected volatile int minConnections;
public PoolStats(final long timeoutMs)
{
this.timeoutMs = timeoutMs;
this.reloadAt = new AtomicLong();
}
public int getTotalConnections()
{
if (shouldLoad()) {
update();
}
return totalConnections;
}
public int getIdleConnections()
{
if (shouldLoad()) {
update();
}
return idleConnections;
}
public int getActiveConnections()
{
if (shouldLoad()) {
update();
}
return activeConnections;
}
public int getPendingThreads()
{
if (shouldLoad()) {
update();
}
return pendingThreads;
}
public int getMaxConnections() {
if (shouldLoad()) {
update();
}
return maxConnections;
}
public int getMinConnections() {
if (shouldLoad()) {
update();
}
return minConnections;
}
protected abstract void update();
private boolean shouldLoad()
{
for (; ; ) {
final var now = currentTime();
final var reloadTime = reloadAt.get();
if (reloadTime > now) {
return false;
}
else if (reloadAt.compareAndSet(reloadTime, plusMillis(now, timeoutMs))) {
return true;
}
}
}
}