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*
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* published by the Free Software Foundation. Oracle designates this
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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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*
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/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
*/
package java.util.concurrent;
/**
* A TimeUnit represents time durations at a given unit of
* granularity and provides utility methods to convert across units,
* and to perform timing and delay operations in these units. A
* TimeUnit does not maintain time information, but only
* helps organize and use time representations that may be maintained
* separately across various contexts. A nanosecond is defined as one
* thousandth of a microsecond, a microsecond as one thousandth of a
* millisecond, a millisecond as one thousandth of a second, a minute
* as sixty seconds, an hour as sixty minutes, and a day as twenty four
* hours.
*
* A TimeUnit is mainly used to inform time-based methods
* how a given timing parameter should be interpreted. For example,
* the following code will timeout in 50 milliseconds if the {@link
* java.util.concurrent.locks.Lock lock} is not available:
*
*
Lock lock = ...;
* if (lock.tryLock(50L, TimeUnit.MILLISECONDS)) ...
*
* while this code will timeout in 50 seconds:
*
* Lock lock = ...;
* if (lock.tryLock(50L, TimeUnit.SECONDS)) ...
*
*
* Note however, that there is no guarantee that a particular timeout
* implementation will be able to notice the passage of time at the
* same granularity as the given TimeUnit.
*
* @since 1.5
* @author Doug Lea
*/
public enum TimeUnit
{
NANOSECONDS
{
public long toNanos(long d)
{
return d;
}
public long toMicros(long d)
{
return d / (C1 / C0);
}
public long toMillis(long d)
{
return d / (C2 / C0);
}
public long toSeconds(long d)
{
return d / (C3 / C0);
}
public long toMinutes(long d)
{
return d / (C4 / C0);
}
public long toHours(long d)
{
return d / (C5 / C0);
}
public long toDays(long d)
{
return d / (C6 / C0);
}
public long convert(long d, TimeUnit u)
{
return u.toNanos(d);
}
int excessNanos(long d, long m)
{
return (int) (d - (m * C2));
}
},
MICROSECONDS
{
public long toNanos(long d)
{
return x(d, C1 / C0, MAX / (C1 / C0));
}
public long toMicros(long d)
{
return d;
}
public long toMillis(long d)
{
return d / (C2 / C1);
}
public long toSeconds(long d)
{
return d / (C3 / C1);
}
public long toMinutes(long d)
{
return d / (C4 / C1);
}
public long toHours(long d)
{
return d / (C5 / C1);
}
public long toDays(long d)
{
return d / (C6 / C1);
}
public long convert(long d, TimeUnit u)
{
return u.toMicros(d);
}
int excessNanos(long d, long m)
{
return (int) ((d * C1) - (m * C2));
}
},
MILLISECONDS
{
public long toNanos(long d)
{
return x(d, C2 / C0, MAX / (C2 / C0));
}
public long toMicros(long d)
{
return x(d, C2 / C1, MAX / (C2 / C1));
}
public long toMillis(long d)
{
return d;
}
public long toSeconds(long d)
{
return d / (C3 / C2);
}
public long toMinutes(long d)
{
return d / (C4 / C2);
}
public long toHours(long d)
{
return d / (C5 / C2);
}
public long toDays(long d)
{
return d / (C6 / C2);
}
public long convert(long d, TimeUnit u)
{
return u.toMillis(d);
}
int excessNanos(long d, long m)
{
return 0;
}
},
SECONDS
{
public long toNanos(long d)
{
return x(d, C3 / C0, MAX / (C3 / C0));
}
public long toMicros(long d)
{
return x(d, C3 / C1, MAX / (C3 / C1));
}
public long toMillis(long d)
{
return x(d, C3 / C2, MAX / (C3 / C2));
}
public long toSeconds(long d)
{
return d;
}
public long toMinutes(long d)
{
return d / (C4 / C3);
}
public long toHours(long d)
{
return d / (C5 / C3);
}
public long toDays(long d)
{
return d / (C6 / C3);
}
public long convert(long d, TimeUnit u)
{
return u.toSeconds(d);
}
int excessNanos(long d, long m)
{
return 0;
}
},
MINUTES
{
public long toNanos(long d)
{
return x(d, C4 / C0, MAX / (C4 / C0));
}
public long toMicros(long d)
{
return x(d, C4 / C1, MAX / (C4 / C1));
}
public long toMillis(long d)
{
return x(d, C4 / C2, MAX / (C4 / C2));
}
public long toSeconds(long d)
{
return x(d, C4 / C3, MAX / (C4 / C3));
}
public long toMinutes(long d)
{
return d;
}
public long toHours(long d)
{
return d / (C5 / C4);
}
public long toDays(long d)
{
return d / (C6 / C4);
}
public long convert(long d, TimeUnit u)
{
return u.toMinutes(d);
}
int excessNanos(long d, long m)
{
return 0;
}
},
HOURS
{
public long toNanos(long d)
{
return x(d, C5 / C0, MAX / (C5 / C0));
}
public long toMicros(long d)
{
return x(d, C5 / C1, MAX / (C5 / C1));
}
public long toMillis(long d)
{
return x(d, C5 / C2, MAX / (C5 / C2));
}
public long toSeconds(long d)
{
return x(d, C5 / C3, MAX / (C5 / C3));
}
public long toMinutes(long d)
{
return x(d, C5 / C4, MAX / (C5 / C4));
}
public long toHours(long d)
{
return d;
}
public long toDays(long d)
{
return d / (C6 / C5);
}
public long convert(long d, TimeUnit u)
{
return u.toHours(d);
}
int excessNanos(long d, long m)
{
return 0;
}
},
DAYS
{
public long toNanos(long d)
{
return x(d, C6 / C0, MAX / (C6 / C0));
}
public long toMicros(long d)
{
return x(d, C6 / C1, MAX / (C6 / C1));
}
public long toMillis(long d)
{
return x(d, C6 / C2, MAX / (C6 / C2));
}
public long toSeconds(long d)
{
return x(d, C6 / C3, MAX / (C6 / C3));
}
public long toMinutes(long d)
{
return x(d, C6 / C4, MAX / (C6 / C4));
}
public long toHours(long d)
{
return x(d, C6 / C5, MAX / (C6 / C5));
}
public long toDays(long d)
{
return d;
}
public long convert(long d, TimeUnit u)
{
return u.toDays(d);
}
int excessNanos(long d, long m)
{
return 0;
}
};
// Handy constants for conversion methods
static final long C0= 1L;
static final long C1= C0 * 1000L;
static final long C2= C1 * 1000L;
static final long C3= C2 * 1000L;
static final long C4= C3 * 60L;
static final long C5= C4 * 60L;
static final long C6= C5 * 24L;
static final long MAX= Long.MAX_VALUE;
/**
* Scale d by m, checking for overflow.
* This has a short name to make above code more readable.
*/
static long x(long d, long m, long over)
{
if (d > over)
return Long.MAX_VALUE;
if (d < -over)
return Long.MIN_VALUE;
return d * m;
}
// To maintain full signature compatibility with 1.5, and to improve the
// clarity of the generated javadoc (see 6287639: Abstract methods in
// enum classes should not be listed as abstract), method convert
// etc. are not declared abstract but otherwise act as abstract methods.
/**
* Convert the given time duration in the given unit to this
* unit. Conversions from finer to coarser granularities
* truncate, so lose precision. For example converting
* 999 milliseconds to seconds results in
* 0. Conversions from coarser to finer granularities
* with arguments that would numerically overflow saturate to
* Long.MIN_VALUE if negative or Long.MAX_VALUE
* if positive.
*
* For example, to convert 10 minutes to milliseconds, use:
* TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)
*
* @param sourceDuration the time duration in the given sourceUnit
* @param sourceUnit the unit of the sourceDuration argument
* @return the converted duration in this unit,
* or Long.MIN_VALUE if conversion would negatively
* overflow, or Long.MAX_VALUE if it would positively overflow.
*/
public long convert(long sourceDuration, TimeUnit sourceUnit)
{
throw new AbstractMethodError();
}
/**
* Equivalent to NANOSECONDS.convert(duration, this).
* @param duration the duration
* @return the converted duration,
* or Long.MIN_VALUE if conversion would negatively
* overflow, or Long.MAX_VALUE if it would positively overflow.
* @see #convert
*/
public long toNanos(long duration)
{
throw new AbstractMethodError();
}
/**
* Equivalent to MICROSECONDS.convert(duration, this).
* @param duration the duration
* @return the converted duration,
* or Long.MIN_VALUE if conversion would negatively
* overflow, or Long.MAX_VALUE if it would positively overflow.
* @see #convert
*/
public long toMicros(long duration)
{
throw new AbstractMethodError();
}
/**
* Equivalent to MILLISECONDS.convert(duration, this).
* @param duration the duration
* @return the converted duration,
* or Long.MIN_VALUE if conversion would negatively
* overflow, or Long.MAX_VALUE if it would positively overflow.
* @see #convert
*/
public long toMillis(long duration)
{
throw new AbstractMethodError();
}
/**
* Equivalent to SECONDS.convert(duration, this).
* @param duration the duration
* @return the converted duration,
* or Long.MIN_VALUE if conversion would negatively
* overflow, or Long.MAX_VALUE if it would positively overflow.
* @see #convert
*/
public long toSeconds(long duration)
{
throw new AbstractMethodError();
}
/**
* Equivalent to MINUTES.convert(duration, this).
* @param duration the duration
* @return the converted duration,
* or Long.MIN_VALUE if conversion would negatively
* overflow, or Long.MAX_VALUE if it would positively overflow.
* @see #convert
* @since 1.6
*/
public long toMinutes(long duration)
{
throw new AbstractMethodError();
}
/**
* Equivalent to HOURS.convert(duration, this).
* @param duration the duration
* @return the converted duration,
* or Long.MIN_VALUE if conversion would negatively
* overflow, or Long.MAX_VALUE if it would positively overflow.
* @see #convert
* @since 1.6
*/
public long toHours(long duration)
{
throw new AbstractMethodError();
}
/**
* Equivalent to DAYS.convert(duration, this).
* @param duration the duration
* @return the converted duration
* @see #convert
* @since 1.6
*/
public long toDays(long duration)
{
throw new AbstractMethodError();
}
/**
* Utility to compute the excess-nanosecond argument to wait,
* sleep, join.
* @param d the duration
* @param m the number of milliseconds
* @return the number of nanoseconds
*/
abstract int excessNanos(long d, long m);
/**
* Performs a timed {@link Object#wait(long, int) Object.wait}
* using this time unit.
* This is a convenience method that converts timeout arguments
* into the form required by the Object.wait method.
*
*
For example, you could implement a blocking poll
* method (see {@link BlockingQueue#poll BlockingQueue.poll})
* using:
*
*
{@code
* public synchronized Object poll(long timeout, TimeUnit unit)
* throws InterruptedException {
* while (empty) {
* unit.timedWait(this, timeout);
* ...
* }
* }}
*
* @param obj the object to wait on
* @param timeout the maximum time to wait. If less than
* or equal to zero, do not wait at all.
* @throws InterruptedException if interrupted while waiting
*/
public void timedWait(Object obj, long timeout) throws InterruptedException
{
if (timeout > 0)
{
long ms= toMillis(timeout);
int ns= excessNanos(timeout, ms);
obj.wait(ms, ns);
}
}
/**
* Performs a timed {@link Thread#join(long, int) Thread.join}
* using this time unit.
* This is a convenience method that converts time arguments into the
* form required by the Thread.join method.
*
* @param thread the thread to wait for
* @param timeout the maximum time to wait. If less than
* or equal to zero, do not wait at all.
* @throws InterruptedException if interrupted while waiting
*/
public void timedJoin(Thread thread, long timeout) throws InterruptedException
{
if (timeout > 0)
{
long ms= toMillis(timeout);
int ns= excessNanos(timeout, ms);
thread.join(ms, ns);
}
}
/**
* Performs a {@link Thread#sleep(long, int) Thread.sleep} using
* this time unit.
* This is a convenience method that converts time arguments into the
* form required by the Thread.sleep method.
*
* @param timeout the minimum time to sleep. If less than
* or equal to zero, do not sleep at all.
* @throws InterruptedException if interrupted while sleeping
*/
public void sleep(long timeout) throws InterruptedException
{
if (timeout > 0)
{
long ms= toMillis(timeout);
int ns= excessNanos(timeout, ms);
Thread.sleep(ms, ns);
}
}
}