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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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*/ |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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package java.util.concurrent; |
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/** |
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* A <tt>TimeUnit</tt> represents time durations at a given unit of |
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* A {@code TimeUnit} represents time durations at a given unit of |
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* granularity and provides utility methods to convert across units, |
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* and to perform timing and delay operations in these units. A |
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* <tt>TimeUnit</tt> does not maintain time information, but only |
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* {@code TimeUnit} does not maintain time information, but only |
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* helps organize and use time representations that may be maintained |
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* separately across various contexts. A nanosecond is defined as one |
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* thousandth of a microsecond, a microsecond as one thousandth of a |
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* as sixty seconds, an hour as sixty minutes, and a day as twenty four |
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* hours. |
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* |
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* <p>A <tt>TimeUnit</tt> is mainly used to inform time-based methods |
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* <p>A {@code TimeUnit} is mainly used to inform time-based methods |
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* how a given timing parameter should be interpreted. For example, |
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* the following code will timeout in 50 milliseconds if the {@link |
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* java.util.concurrent.locks.Lock lock} is not available: |
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* |
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* <pre> Lock lock = ...; |
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* if ( lock.tryLock(50L, TimeUnit.MILLISECONDS) ) ... |
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* </pre> |
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* <pre> {@code |
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* Lock lock = ...; |
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* if (lock.tryLock(50L, TimeUnit.MILLISECONDS)) ...}</pre> |
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* |
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* while this code will timeout in 50 seconds: |
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* <pre> |
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* Lock lock = ...; |
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* if ( lock.tryLock(50L, TimeUnit.SECONDS) ) ... |
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* </pre> |
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* <pre> {@code |
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* Lock lock = ...; |
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* if (lock.tryLock(50L, TimeUnit.SECONDS)) ...}</pre> |
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* |
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* Note however, that there is no guarantee that a particular timeout |
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* implementation will be able to notice the passage of time at the |
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* same granularity as the given <tt>TimeUnit</tt>. |
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* same granularity as the given {@code TimeUnit}. |
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* |
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* @since 1.5 |
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* @author Doug Lea |
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*/ |
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public enum TimeUnit { |
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NANOSECONDS (0) { |
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/** |
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* Time unit representing one thousandth of a microsecond |
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*/ |
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NANOSECONDS { |
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public long toNanos(long d) { return d; } |
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public long toMicros(long d) { return d/(C1/C0); } |
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public long toMillis(long d) { return d/(C2/C0); } |
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public long convert(long d, TimeUnit u) { return u.toNanos(d); } |
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int excessNanos(long d, long m) { return (int)(d - (m*C2)); } |
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}, |
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MICROSECONDS (1) { |
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|
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/** |
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* Time unit representing one thousandth of a millisecond |
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*/ |
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MICROSECONDS { |
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public long toNanos(long d) { return x(d, C1/C0, MAX/(C1/C0)); } |
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public long toMicros(long d) { return d; } |
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public long toMillis(long d) { return d/(C2/C1); } |
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public long convert(long d, TimeUnit u) { return u.toMicros(d); } |
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int excessNanos(long d, long m) { return (int)((d*C1) - (m*C2)); } |
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}, |
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MILLISECONDS (2) { |
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|
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/** |
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* Time unit representing one thousandth of a second |
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*/ |
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MILLISECONDS { |
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public long toNanos(long d) { return x(d, C2/C0, MAX/(C2/C0)); } |
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public long toMicros(long d) { return x(d, C2/C1, MAX/(C2/C1)); } |
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public long toMillis(long d) { return d; } |
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public long convert(long d, TimeUnit u) { return u.toMillis(d); } |
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int excessNanos(long d, long m) { return 0; } |
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}, |
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SECONDS (3) { |
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|
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/** |
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* Time unit representing one second |
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*/ |
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SECONDS { |
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public long toNanos(long d) { return x(d, C3/C0, MAX/(C3/C0)); } |
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public long toMicros(long d) { return x(d, C3/C1, MAX/(C3/C1)); } |
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public long toMillis(long d) { return x(d, C3/C2, MAX/(C3/C2)); } |
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public long convert(long d, TimeUnit u) { return u.toSeconds(d); } |
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int excessNanos(long d, long m) { return 0; } |
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}, |
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MINUTES (4) { |
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|
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/** |
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* Time unit representing sixty seconds |
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* @since 1.6 |
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*/ |
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MINUTES { |
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public long toNanos(long d) { return x(d, C4/C0, MAX/(C4/C0)); } |
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public long toMicros(long d) { return x(d, C4/C1, MAX/(C4/C1)); } |
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public long toMillis(long d) { return x(d, C4/C2, MAX/(C4/C2)); } |
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public long convert(long d, TimeUnit u) { return u.toMinutes(d); } |
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int excessNanos(long d, long m) { return 0; } |
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}, |
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HOURS (5) { |
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|
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/** |
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* Time unit representing sixty minutes |
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* @since 1.6 |
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*/ |
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HOURS { |
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public long toNanos(long d) { return x(d, C5/C0, MAX/(C5/C0)); } |
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public long toMicros(long d) { return x(d, C5/C1, MAX/(C5/C1)); } |
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public long toMillis(long d) { return x(d, C5/C2, MAX/(C5/C2)); } |
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public long convert(long d, TimeUnit u) { return u.toHours(d); } |
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int excessNanos(long d, long m) { return 0; } |
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}, |
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DAYS (6) { |
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|
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/** |
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* Time unit representing twenty four hours |
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* @since 1.6 |
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*/ |
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DAYS { |
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public long toNanos(long d) { return x(d, C6/C0, MAX/(C6/C0)); } |
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public long toMicros(long d) { return x(d, C6/C1, MAX/(C6/C1)); } |
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public long toMillis(long d) { return x(d, C6/C2, MAX/(C6/C2)); } |
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public long convert(long d, TimeUnit u) { return u.toDays(d); } |
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int excessNanos(long d, long m) { return 0; } |
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}; |
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|
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/** |
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* The index of this unit. This value is no longer used in this |
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* version of this class, but is retained for serialization |
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* compatibility with previous version. |
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*/ |
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private final int index; |
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|
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/** Internal constructor */ |
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TimeUnit(int index) { |
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this.index = index; |
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} |
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|
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|
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// Handy constants for conversion methods |
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static final long C0 = 1L; |
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static final long C1 = C0 * 1000L; |
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static final long C4 = C3 * 60L; |
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static final long C5 = C4 * 60L; |
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static final long C6 = C5 * 24L; |
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static final long MAX = Long.MAX_VALUE; |
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|
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/** |
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* Scale d by m, checking for overflow. |
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* This has a short name to make above code more readable. |
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if (d < -over) return Long.MIN_VALUE; |
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return d * m; |
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} |
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|
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|
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// To maintain full signature compatibility with 1.5, and to improve the |
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// clarity of the generated javadoc (see 6287639: Abstract methods in |
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// enum classes should not be listed as abstract), method convert |
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// etc. are not declared abstract but otherwise act as abstract methods. |
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|
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/** |
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* Convert the given time duration in the given unit to this |
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* unit. Conversions from finer to coarser granularities |
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* truncate, so lose precision. For example converting |
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* <tt>999</tt> milliseconds to seconds results in |
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* <tt>0</tt>. Conversions from coarser to finer granularities |
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* with arguments that would numerically overflow saturate to |
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* <tt>Long.MIN_VALUE</tt> if negative or <tt>Long.MAX_VALUE</tt> |
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* if positive. |
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* Converts the given time duration in the given unit to this unit. |
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* Conversions from finer to coarser granularities truncate, so |
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* lose precision. For example, converting {@code 999} milliseconds |
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* to seconds results in {@code 0}. Conversions from coarser to |
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* finer granularities with arguments that would numerically |
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* overflow saturate to {@code Long.MIN_VALUE} if negative or |
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* {@code Long.MAX_VALUE} if positive. |
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* |
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* <p>For example, to convert 10 minutes to milliseconds, use: |
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* {@code TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)} |
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* |
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* @param duration the time duration in the given <tt>unit</tt> |
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* @param unit the unit of the <tt>duration</tt> argument |
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* @param sourceDuration the time duration in the given {@code sourceUnit} |
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* @param sourceUnit the unit of the {@code sourceDuration} argument |
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* @return the converted duration in this unit, |
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* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
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* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
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* or {@code Long.MIN_VALUE} if conversion would negatively |
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* overflow, or {@code Long.MAX_VALUE} if it would positively overflow. |
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*/ |
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public abstract long convert(long duration, TimeUnit unit); |
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|
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public long convert(long sourceDuration, TimeUnit sourceUnit) { |
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throw new AbstractMethodError(); |
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} |
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|
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/** |
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* Equivalent to <tt>NANOSECONDS.convert(duration, this)</tt>. |
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* Equivalent to |
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* {@link #convert(long, TimeUnit) NANOSECONDS.convert(duration, this)}. |
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* @param duration the duration |
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* @return the converted duration, |
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* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
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* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
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* @see #convert |
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* or {@code Long.MIN_VALUE} if conversion would negatively |
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* overflow, or {@code Long.MAX_VALUE} if it would positively overflow. |
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*/ |
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public abstract long toNanos(long duration); |
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|
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public long toNanos(long duration) { |
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throw new AbstractMethodError(); |
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} |
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|
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/** |
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* Equivalent to <tt>MICROSECONDS.convert(duration, this)</tt>. |
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* Equivalent to |
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* {@link #convert(long, TimeUnit) MICROSECONDS.convert(duration, this)}. |
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* @param duration the duration |
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* @return the converted duration, |
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* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
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* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
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* @see #convert |
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* or {@code Long.MIN_VALUE} if conversion would negatively |
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* overflow, or {@code Long.MAX_VALUE} if it would positively overflow. |
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*/ |
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public abstract long toMicros(long duration); |
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|
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public long toMicros(long duration) { |
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throw new AbstractMethodError(); |
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} |
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> |
|
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/** |
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< |
* Equivalent to <tt>MILLISECONDS.convert(duration, this)</tt>. |
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> |
* Equivalent to |
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> |
* {@link #convert(long, TimeUnit) MILLISECONDS.convert(duration, this)}. |
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* @param duration the duration |
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* @return the converted duration, |
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< |
* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
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< |
* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
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< |
* @see #convert |
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> |
* or {@code Long.MIN_VALUE} if conversion would negatively |
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* overflow, or {@code Long.MAX_VALUE} if it would positively overflow. |
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*/ |
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< |
public abstract long toMillis(long duration); |
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< |
|
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> |
public long toMillis(long duration) { |
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throw new AbstractMethodError(); |
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> |
} |
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> |
|
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/** |
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< |
* Equivalent to <tt>SECONDS.convert(duration, this)</tt>. |
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> |
* Equivalent to |
| 237 |
> |
* {@link #convert(long, TimeUnit) SECONDS.convert(duration, this)}. |
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* @param duration the duration |
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* @return the converted duration, |
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< |
* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
| 241 |
< |
* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
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< |
* @see #convert |
| 240 |
> |
* or {@code Long.MIN_VALUE} if conversion would negatively |
| 241 |
> |
* overflow, or {@code Long.MAX_VALUE} if it would positively overflow. |
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*/ |
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< |
public abstract long toSeconds(long duration); |
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< |
|
| 243 |
> |
public long toSeconds(long duration) { |
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throw new AbstractMethodError(); |
| 245 |
> |
} |
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> |
|
| 247 |
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/** |
| 248 |
< |
* Equivalent to <tt>MINUTES.convert(duration, this)</tt>. |
| 248 |
> |
* Equivalent to |
| 249 |
> |
* {@link #convert(long, TimeUnit) MINUTES.convert(duration, this)}. |
| 250 |
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* @param duration the duration |
| 251 |
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* @return the converted duration, |
| 252 |
< |
* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
| 253 |
< |
* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
| 254 |
< |
* @see #convert |
| 252 |
> |
* or {@code Long.MIN_VALUE} if conversion would negatively |
| 253 |
> |
* overflow, or {@code Long.MAX_VALUE} if it would positively overflow. |
| 254 |
> |
* @since 1.6 |
| 255 |
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*/ |
| 256 |
< |
public abstract long toMinutes(long duration); |
| 257 |
< |
|
| 256 |
> |
public long toMinutes(long duration) { |
| 257 |
> |
throw new AbstractMethodError(); |
| 258 |
> |
} |
| 259 |
> |
|
| 260 |
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/** |
| 261 |
< |
* Equivalent to <tt>HOURS.convert(duration, this)</tt>. |
| 261 |
> |
* Equivalent to |
| 262 |
> |
* {@link #convert(long, TimeUnit) HOURS.convert(duration, this)}. |
| 263 |
|
* @param duration the duration |
| 264 |
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* @return the converted duration, |
| 265 |
< |
* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
| 266 |
< |
* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
| 267 |
< |
* @see #convert |
| 265 |
> |
* or {@code Long.MIN_VALUE} if conversion would negatively |
| 266 |
> |
* overflow, or {@code Long.MAX_VALUE} if it would positively overflow. |
| 267 |
> |
* @since 1.6 |
| 268 |
|
*/ |
| 269 |
< |
public abstract long toHours(long duration); |
| 270 |
< |
|
| 269 |
> |
public long toHours(long duration) { |
| 270 |
> |
throw new AbstractMethodError(); |
| 271 |
> |
} |
| 272 |
> |
|
| 273 |
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/** |
| 274 |
< |
* Equivalent to <tt>DAYS.convert(duration, this)</tt>. |
| 274 |
> |
* Equivalent to |
| 275 |
> |
* {@link #convert(long, TimeUnit) DAYS.convert(duration, this)}. |
| 276 |
|
* @param duration the duration |
| 277 |
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* @return the converted duration |
| 278 |
< |
* @see #convert |
| 278 |
> |
* @since 1.6 |
| 279 |
|
*/ |
| 280 |
< |
public abstract long toDays(long duration); |
| 281 |
< |
|
| 280 |
> |
public long toDays(long duration) { |
| 281 |
> |
throw new AbstractMethodError(); |
| 282 |
> |
} |
| 283 |
> |
|
| 284 |
|
/** |
| 285 |
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* Utility to compute the excess-nanosecond argument to wait, |
| 286 |
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* sleep, join. |
| 289 |
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* @return the number of nanoseconds |
| 290 |
|
*/ |
| 291 |
|
abstract int excessNanos(long d, long m); |
| 292 |
< |
|
| 292 |
> |
|
| 293 |
|
/** |
| 294 |
< |
* Perform a timed <tt>Object.wait</tt> using this time unit. |
| 294 |
> |
* Performs a timed {@link Object#wait(long, int) Object.wait} |
| 295 |
> |
* using this time unit. |
| 296 |
|
* This is a convenience method that converts timeout arguments |
| 297 |
< |
* into the form required by the <tt>Object.wait</tt> method. |
| 297 |
> |
* into the form required by the {@code Object.wait} method. |
| 298 |
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* |
| 299 |
< |
* <p>For example, you could implement a blocking <tt>poll</tt> |
| 299 |
> |
* <p>For example, you could implement a blocking {@code poll} |
| 300 |
|
* method (see {@link BlockingQueue#poll BlockingQueue.poll}) |
| 301 |
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* using: |
| 302 |
|
* |
| 303 |
< |
* <pre> public synchronized Object poll(long timeout, TimeUnit unit) throws InterruptedException { |
| 304 |
< |
* while (empty) { |
| 305 |
< |
* unit.timedWait(this, timeout); |
| 306 |
< |
* ... |
| 307 |
< |
* } |
| 308 |
< |
* }</pre> |
| 303 |
> |
* <pre> {@code |
| 304 |
> |
* public synchronized Object poll(long timeout, TimeUnit unit) |
| 305 |
> |
* throws InterruptedException { |
| 306 |
> |
* while (empty) { |
| 307 |
> |
* unit.timedWait(this, timeout); |
| 308 |
> |
* ... |
| 309 |
> |
* } |
| 310 |
> |
* }}</pre> |
| 311 |
|
* |
| 312 |
|
* @param obj the object to wait on |
| 313 |
< |
* @param timeout the maximum time to wait. |
| 314 |
< |
* @throws InterruptedException if interrupted while waiting. |
| 315 |
< |
* @see Object#wait(long, int) |
| 313 |
> |
* @param timeout the maximum time to wait. If less than |
| 314 |
> |
* or equal to zero, do not wait at all. |
| 315 |
> |
* @throws InterruptedException if interrupted while waiting |
| 316 |
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*/ |
| 317 |
|
public void timedWait(Object obj, long timeout) |
| 318 |
< |
throws InterruptedException { |
| 318 |
> |
throws InterruptedException { |
| 319 |
|
if (timeout > 0) { |
| 320 |
|
long ms = toMillis(timeout); |
| 321 |
|
int ns = excessNanos(timeout, ms); |
| 322 |
|
obj.wait(ms, ns); |
| 323 |
|
} |
| 324 |
|
} |
| 325 |
< |
|
| 325 |
> |
|
| 326 |
|
/** |
| 327 |
< |
* Perform a timed <tt>Thread.join</tt> using this time unit. |
| 327 |
> |
* Performs a timed {@link Thread#join(long, int) Thread.join} |
| 328 |
> |
* using this time unit. |
| 329 |
|
* This is a convenience method that converts time arguments into the |
| 330 |
< |
* form required by the <tt>Thread.join</tt> method. |
| 330 |
> |
* form required by the {@code Thread.join} method. |
| 331 |
> |
* |
| 332 |
|
* @param thread the thread to wait for |
| 333 |
< |
* @param timeout the maximum time to wait |
| 334 |
< |
* @throws InterruptedException if interrupted while waiting. |
| 335 |
< |
* @see Thread#join(long, int) |
| 333 |
> |
* @param timeout the maximum time to wait. If less than |
| 334 |
> |
* or equal to zero, do not wait at all. |
| 335 |
> |
* @throws InterruptedException if interrupted while waiting |
| 336 |
|
*/ |
| 337 |
|
public void timedJoin(Thread thread, long timeout) |
| 338 |
< |
throws InterruptedException { |
| 338 |
> |
throws InterruptedException { |
| 339 |
|
if (timeout > 0) { |
| 340 |
|
long ms = toMillis(timeout); |
| 341 |
|
int ns = excessNanos(timeout, ms); |
| 342 |
|
thread.join(ms, ns); |
| 343 |
|
} |
| 344 |
|
} |
| 345 |
< |
|
| 345 |
> |
|
| 346 |
|
/** |
| 347 |
< |
* Perform a <tt>Thread.sleep</tt> using this unit. |
| 347 |
> |
* Performs a {@link Thread#sleep(long, int) Thread.sleep} using |
| 348 |
> |
* this time unit. |
| 349 |
|
* This is a convenience method that converts time arguments into the |
| 350 |
< |
* form required by the <tt>Thread.sleep</tt> method. |
| 351 |
< |
* @param timeout the minimum time to sleep |
| 352 |
< |
* @throws InterruptedException if interrupted while sleeping. |
| 353 |
< |
* @see Thread#sleep |
| 350 |
> |
* form required by the {@code Thread.sleep} method. |
| 351 |
> |
* |
| 352 |
> |
* @param timeout the minimum time to sleep. If less than |
| 353 |
> |
* or equal to zero, do not sleep at all. |
| 354 |
> |
* @throws InterruptedException if interrupted while sleeping |
| 355 |
|
*/ |
| 356 |
|
public void sleep(long timeout) throws InterruptedException { |
| 357 |
|
if (timeout > 0) { |
| 360 |
|
Thread.sleep(ms, ns); |
| 361 |
|
} |
| 362 |
|
} |
| 363 |
< |
|
| 363 |
> |
|
| 364 |
|
} |
