icu.easyj.core.clock.TickClock Maven / Gradle / Ivy

/*
 * Copyright 2021 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;

/**
 * 记号时钟
 *
 * @author wangliang181230
 */
public class TickClock implements ITickClock {

	//region 基准时间（为了获取指定单位的时间少一次计算，保存三个基准时间）

	/**
	 * 基准时间-毫秒数
	 */
	private final long baseEpochMillis;

	/**
	 * 基准时间-微秒数
	 */
	private final long baseEpochMicros;

	/**
	 * 基准时间-纳秒数
	 * 注意：值格式与 {@link System#nanoTime()} 并不相同
	 */
	private final long baseEpochNanos;

	//endregion

	/**
	 * 基准记号-纳秒数
	 */
	private final long baseTickNanos;

	/**
	 * 构造函数
	 *
	 * @param baseEpochMicros 基准时间微秒数
	 * @param baseTickNanos   基准记号纳秒数
	 */
	public TickClock(long baseEpochMicros, long baseTickNanos) {
		// 设置基准时间-毫秒数、微秒数、纳秒数
		this.baseEpochMillis = baseEpochMicros / 1000;
		this.baseEpochMicros = baseEpochMicros;
		this.baseEpochNanos = baseEpochMicros * 1000;
		// 设置基准记号纳秒数
		this.baseTickNanos = baseTickNanos;
	}

	/**
	 * 构造函数
	 *
	 * @param baseEpochMicros 基准时间微秒数
	 */
	public TickClock(long baseEpochMicros) {
		this(baseEpochMicros, System.nanoTime());
	}


	//region Override

	//region Override IClock

	@Override
	public long currentTimeMillis() {
		return (getPassedNanos() / 1000000) + baseEpochMillis;
	}

	@Override
	public long currentTimeMicros() {
		return (getPassedNanos() / 1000) + baseEpochMicros;
	}

	@Override
	public long currentTimeNanos() {
		return getPassedNanos() + baseEpochNanos;
	}

	//endregion

	//region Override ITickClock

	@Override
	public long getBaseEpochMicros() {
		return this.baseEpochMicros;
	}

	@Override
	public long getBaseTickNanos() {
		return this.baseTickNanos;
	}

	//endregion

	//endregion
}