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/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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.android.tv.common.util;
import android.os.SystemClock;
/**
* An interface through which system clocks can be read. The {@link #SYSTEM} implementation must be
* used for all non-test cases.
*/
public interface Clock {
/**
* Returns the current time in milliseconds since January 1, 1970 00:00:00.0 UTC.
*
* @see System#currentTimeMillis().
*/
long currentTimeMillis();
/**
* Returns milliseconds since boot, including time spent in sleep.
*
* @see SystemClock#elapsedRealtime()
*/
long elapsedRealtime();
/**
* Returns milliseconds since boot, not counting time spent in deep sleep.
*
* @return milliseconds of non-sleep uptime since boot.
* @see SystemClock#uptimeMillis()
*/
long uptimeMillis();
/**
* Waits a given number of milliseconds (of uptimeMillis) before returning.
*
* @param ms to sleep before returning, in milliseconds of uptime.
* @see SystemClock#sleep(long)
*/
void sleep(long ms);
/** The default implementation of Clock. */
Clock SYSTEM =
new Clock() {
@Override
public long currentTimeMillis() {
return System.currentTimeMillis();
}
@Override
public long elapsedRealtime() {
return SystemClock.elapsedRealtime();
}
@Override
public void sleep(long ms) {
SystemClock.sleep(ms);
}
@Override
public long uptimeMillis() {
return SystemClock.uptimeMillis();
}
};
}
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