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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.qpid.test.framework.clocksynch;
/**
* LocalClockSynchronizer is a fake {@link ClockSynchronizer} that simply calls System.nanoTime(). It exists so that
* the same tests can be run distributed or locally, taking timings against the ClockSynchronizer interface without
* being aware of how they are being run.
*
* <p/><table id="crc"><caption>CRC Card</caption>
* <tr><th> Responsibilities <th> Collaborations
* <tr><td> Supply the local clock with no delta.
* </table>
*/
public class LocalClockSynchronizer implements ClockSynchronizer
{
/**
* The slave side should call this to copute a clock delta with the reference.
*
* @throws org.apache.qpid.test.framework.clocksynch.ClockSynchFailureException
* If synchronization cannot be achieved.
*/
public void synch() throws ClockSynchFailureException
{ }
/**
* Gets the clock delta in nano seconds.
*
* @return The clock delta in nano seconds.
*/
public long getDelta()
{
return 0L;
}
/**
* Gets an estimate of the clock error in nan seconds.
*
* @return An estimate of the clock error in nan seconds.
*/
public long getEpsilon()
{
return 0L;
}
/**
* Gets the local clock time with any computed delta added in.
*
* @return The local clock time with any computed delta added in.
*/
public long nanoTime()
{
return System.nanoTime();
}
}
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