com.wudaosoft.commons.utils.Clock Maven / Gradle / Ivy
/**
* Copyright 2009-2018 Wudao Software Studio(wudaosoft.com)
*
* 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.wudaosoft.commons.utils;
import java.util.Date;
/**
* 日期提供者，使用它而不是直接取得系统时间，方便测试。
*
* @author Changsoul Wu
*/
public interface Clock {
static final Clock DEFAULT = new DefaultClock();
Date getCurrentDate();
long getCurrentTimeInMillis();
/**
* 默认时间提供者，返回当前的时间，线程安全。
*/
public static class DefaultClock implements Clock {
@Override
public Date getCurrentDate() {
return new Date();
}
@Override
public long getCurrentTimeInMillis() {
return System.currentTimeMillis();
}
}
/**
* 可配置的时间提供者，用于测试.
*/
public static class MockClock implements Clock {
private long time;
public MockClock() {
this(0);
}
public MockClock(Date date) {
this.time = date.getTime();
}
public MockClock(long time) {
this.time = time;
}
@Override
public Date getCurrentDate() {
return new Date(time);
}
@Override
public long getCurrentTimeInMillis() {
return time;
}
/**
* 重新设置日期。
*/
public void update(Date newDate) {
time = newDate.getTime();
}
/**
* 重新设置时间。
*/
public void update(long newTime) {
this.time = newTime;
}
/**
* 滚动时间.
*/
public void increaseTime(int millis) {
time += millis;
}
/**
* 滚动时间.
*/
public void decreaseTime(int millis) {
time -= millis;
}
}
}