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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cassandra.utils;
import java.util.concurrent.TimeUnit;
public interface TimeSource
{
/**
*
* @return the current time in milliseconds
*/
long currentTimeMillis();
/**
*
* @return Returns the current time value in nanoseconds.
*
* This method can only be used to measure elapsed time and is
* not related to any other notion of system or wall-clock time.
*/
long nanoTime();
/**
* Sleep for the given amount of time uninterruptibly.
*
* @param sleepFor given amout.
* @param unit time unit
* @return The time source itself after the given sleep period.
*/
TimeSource sleepUninterruptibly(long sleepFor, TimeUnit unit);
/**
* Sleep for the given amount of time. This operation could interrupted.
* Hence after returning from this method, it is not guaranteed
* that the request amount of time has passed.
*
* @param sleepFor given amout.
* @param unit time unit
* @return The time source itself after the given sleep period.
*/
TimeSource sleep(long sleepFor, TimeUnit unit) throws InterruptedException;
}