icu.easyj.core.clock.HighAccuracyRefreshableTickClock Maven / Gradle / Ivy
/*
* Copyright 2021-2022 the original author or authors.
*
* 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
*
* https://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 icu.easyj.core.clock;
import java.util.function.Supplier;
import org.springframework.lang.NonNull;
/**
* 高精准可刷新记号时钟
*
* @author wangliang181230
*/
public class HighAccuracyRefreshableTickClock extends RefreshableTickClock {
/**
* 最小尝试次数
*/
protected static final int MIN_TRY_COUNT = 5;
/**
* 默认尝试次数
*/
protected static final int DEFAULT_TRY_COUNT = 10;
/**
* 尝试次数
*
* 为了获取更加精准，时间误差更小的记号时钟，通过多次尝试，获取延迟最小的一次时间作为记号时钟的时间
*/
private final int tryCount;
public HighAccuracyRefreshableTickClock(@NonNull Supplier tickClockSupplier, int tryCount) {
super(tickClockSupplier);
// 不能小于 最小尝试次数（MIN_TRY_COUNT）
this.tryCount = Math.max(tryCount, MIN_TRY_COUNT);
// 初始化
this.init();
}
public HighAccuracyRefreshableTickClock(@NonNull Supplier tickClockSupplier) {
this(tickClockSupplier, DEFAULT_TRY_COUNT);
}
/**
* 刷新记号时钟
*/
@Override
public void refreshTickClock() {
// 尝试次数
int tryCount = this.tryCount;
// 方式一：多次创建远端记号时钟，取耗时最小的一次
// long currentNanoTime;
// ITickClock newTickClock, currentTickClock = null;
// long currentCost, minCost = Long.MAX_VALUE;
// do {
// currentNanoTime = System.nanoTime();
// newTickClock = this.createClock();
// currentCost = newTickClock.getBaseTickNanos() - currentNanoTime;
//
// if (currentTickClock == null || minCost > currentCost) {
// currentTickClock = newTickClock;
// minCost = currentCost;
// }
// } while (--tryCount > 0);
// 方式二：多次创建远端记号时钟，取时间最大的时钟
ITickClock newTickClock, currentTickClock = null;
do {
newTickClock = this.createClock();
if (currentTickClock == null || newTickClock.compareTo(currentTickClock) > 0) {
currentTickClock = newTickClock;
}
} while (--tryCount > 0);
super.setTickClock(currentTickClock);
}
//region Getter、Setter
public int getTryCount() {
return tryCount;
}
//endregion
}