Fixes #307 implement a ClockSource that is backed by either System.currentTimeMillis() or System.nanoTime() depending on the platform.
Brett Wooldridge
10 years ago
commit
c9041c83f2
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/*
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* Copyright (C) 2015 Brett Wooldridge
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.zaxxer.hikari.util;
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/**
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* A resolution-independent provider of current time-stamps and elapsed time
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* calculations.
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*
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* @author Brett Wooldridge
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*/
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public interface ClockSource
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{
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final ClockSource INSTANCE = Factory.create();
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/**
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* Get the current time-stamp (resolution is opaque).
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*
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* @return the current time-stamp
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*/
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long currentTime();
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/**
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* Convert an opaque time-stamp returned by currentTime() into
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* milliseconds.
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*
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* @param time an opaque time-stamp returned by an instance of this class
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* @return the time-stamp in milliseconds
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*/
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long toMillis(long time);
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/**
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* Convert an opaque time-stamp returned by currentTime() into an
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* elapsed time in milliseconds, based on the current instant in time.
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*
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* @param startTime an opaque time-stamp returned by an instance of this class
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* @return the elapsed time between startTime and now in milliseconds
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*/
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long elapsedTimeMs(long startTime);
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/**
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* Factory class used to create a platform-specific ClockSource.
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*/
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class Factory
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{
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private static ClockSource create()
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{
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String os = System.getProperty("os.name");
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if ("Mac OS X".equals(os)) {
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return new MillisecondClockSource();
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}
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return new NanosecondClockSource();
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}
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}
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}
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@ -0,0 +1,48 @@
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/*
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* Copyright (C) 2013 Brett Wooldridge
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.zaxxer.hikari.util;
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/**
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* A System.currentTimeMillis()-based provider of current time-stamps and elapsed time
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* calculations.
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*
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* @author Brett Wooldridge
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*/
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class MillisecondClockSource implements ClockSource
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{
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/** {@inheritDoc} */
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@Override
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public long currentTime()
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{
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return System.currentTimeMillis();
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}
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/** {@inheritDoc} */
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@Override
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public long elapsedTimeMs(final long startTime)
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{
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return System.currentTimeMillis() - startTime;
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}
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/** {@inheritDoc} */
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@Override
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public long toMillis(long time)
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{
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return time;
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}
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}
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@ -0,0 +1,49 @@
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/*
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* Copyright (C) 2015 Brett Wooldridge
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.zaxxer.hikari.util;
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import java.util.concurrent.TimeUnit;
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/**
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* A System.nanoTime()-based provider of current time-stamps and elapsed time
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* calculations.
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*
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* @author Brett Wooldridge
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*/
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class NanosecondClockSource implements ClockSource
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{
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/** {@inheritDoc} */
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@Override
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public long currentTime()
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{
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return System.nanoTime();
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}
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/** {@inheritDoc} */
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@Override
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public long elapsedTimeMs(final long startTime)
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{
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return TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startTime);
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}
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/** {@inheritDoc} */
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@Override
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public final long toMillis(final long time)
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{
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return TimeUnit.NANOSECONDS.toMillis(time);
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}
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}
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