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1.2 |
/* |
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jsr166 |
1.35 |
* 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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jsr166 |
1.38 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
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jsr166 |
1.35 |
*/ |
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dl |
1.2 |
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tim |
1.1 |
package java.util.concurrent; |
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/** |
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1.27 |
* A <tt>TimeUnit</tt> 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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* 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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* millisecond, a millisecond as one thousandth of a second, a minute |
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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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* 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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jsr166 |
1.39 |
* <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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1.27 |
* while this code will timeout in 50 seconds: |
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1.39 |
* <pre> {@code |
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* Lock lock = ...; |
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* if (lock.tryLock(50L, TimeUnit.SECONDS)) ...}</pre> |
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1.27 |
* |
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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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* |
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* @since 1.5 |
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* @author Doug Lea |
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*/ |
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1.20 |
public enum TimeUnit { |
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1.34 |
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 toSeconds(long d) { return d/(C3/C0); } |
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public long toMinutes(long d) { return d/(C4/C0); } |
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public long toHours(long d) { return d/(C5/C0); } |
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public long toDays(long d) { return d/(C6/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 { |
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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 toSeconds(long d) { return d/(C3/C1); } |
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public long toMinutes(long d) { return d/(C4/C1); } |
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public long toHours(long d) { return d/(C5/C1); } |
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public long toDays(long d) { return d/(C6/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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1.34 |
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 toSeconds(long d) { return d/(C3/C2); } |
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public long toMinutes(long d) { return d/(C4/C2); } |
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public long toHours(long d) { return d/(C5/C2); } |
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public long toDays(long d) { return d/(C6/C2); } |
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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 { |
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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 toSeconds(long d) { return d; } |
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public long toMinutes(long d) { return d/(C4/C3); } |
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public long toHours(long d) { return d/(C5/C3); } |
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public long toDays(long d) { return d/(C6/C3); } |
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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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dl |
1.34 |
MINUTES { |
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1.27 |
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 toSeconds(long d) { return x(d, C4/C3, MAX/(C4/C3)); } |
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public long toMinutes(long d) { return d; } |
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public long toHours(long d) { return d/(C5/C4); } |
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public long toDays(long d) { return d/(C6/C4); } |
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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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dl |
1.34 |
HOURS { |
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1.27 |
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)); } |
102 |
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public long toSeconds(long d) { return x(d, C5/C3, MAX/(C5/C3)); } |
103 |
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public long toMinutes(long d) { return x(d, C5/C4, MAX/(C5/C4)); } |
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public long toHours(long d) { return d; } |
105 |
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public long toDays(long d) { return d/(C6/C5); } |
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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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}, |
109 |
dl |
1.34 |
DAYS { |
110 |
dl |
1.27 |
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)); } |
112 |
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public long toMillis(long d) { return x(d, C6/C2, MAX/(C6/C2)); } |
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public long toSeconds(long d) { return x(d, C6/C3, MAX/(C6/C3)); } |
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public long toMinutes(long d) { return x(d, C6/C4, MAX/(C6/C4)); } |
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public long toHours(long d) { return x(d, C6/C5, MAX/(C6/C5)); } |
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public long toDays(long d) { return d; } |
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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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1.27 |
// 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 C2 = C1 * 1000L; |
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static final long C3 = C2 * 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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dl |
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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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*/ |
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static long x(long d, long m, long over) { |
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if (d > over) return Long.MAX_VALUE; |
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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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1.29 |
|
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jsr166 |
1.33 |
// To maintain full signature compatibility with 1.5, and to improve the |
143 |
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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 |
145 |
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// etc. are not declared abstract but otherwise act as abstract methods. |
146 |
dl |
1.32 |
|
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dl |
1.27 |
/** |
148 |
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* Convert the given time duration in the given unit to this |
149 |
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* unit. Conversions from finer to coarser granularities |
150 |
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* truncate, so lose precision. For example converting |
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* <tt>999</tt> milliseconds to seconds results in |
152 |
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* <tt>0</tt>. Conversions from coarser to finer granularities |
153 |
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* with arguments that would numerically overflow saturate to |
154 |
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* <tt>Long.MIN_VALUE</tt> if negative or <tt>Long.MAX_VALUE</tt> |
155 |
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* if positive. |
156 |
jsr166 |
1.33 |
* |
157 |
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* <p>For example, to convert 10 minutes to milliseconds, use: |
158 |
dl |
1.32 |
* <tt>TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)</tt> |
159 |
dl |
1.27 |
* |
160 |
jsr166 |
1.33 |
* @param sourceDuration the time duration in the given <tt>sourceUnit</tt> |
161 |
dl |
1.32 |
* @param sourceUnit the unit of the <tt>sourceDuration</tt> argument |
162 |
dl |
1.27 |
* @return the converted duration in this unit, |
163 |
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* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
164 |
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* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
165 |
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*/ |
166 |
dl |
1.32 |
public long convert(long sourceDuration, TimeUnit sourceUnit) { |
167 |
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throw new AbstractMethodError(); |
168 |
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} |
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jsr166 |
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|
170 |
dl |
1.27 |
/** |
171 |
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* Equivalent to <tt>NANOSECONDS.convert(duration, this)</tt>. |
172 |
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* @param duration the duration |
173 |
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* @return the converted duration, |
174 |
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* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
175 |
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* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
176 |
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* @see #convert |
177 |
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*/ |
178 |
dl |
1.32 |
public long toNanos(long duration) { |
179 |
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throw new AbstractMethodError(); |
180 |
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} |
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jsr166 |
1.29 |
|
182 |
dl |
1.27 |
/** |
183 |
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* Equivalent to <tt>MICROSECONDS.convert(duration, this)</tt>. |
184 |
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* @param duration the duration |
185 |
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* @return the converted duration, |
186 |
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* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
187 |
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* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
188 |
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* @see #convert |
189 |
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*/ |
190 |
dl |
1.32 |
public long toMicros(long duration) { |
191 |
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throw new AbstractMethodError(); |
192 |
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} |
193 |
jsr166 |
1.29 |
|
194 |
dl |
1.27 |
/** |
195 |
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* Equivalent to <tt>MILLISECONDS.convert(duration, this)</tt>. |
196 |
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* @param duration the duration |
197 |
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* @return the converted duration, |
198 |
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* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
199 |
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* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
200 |
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* @see #convert |
201 |
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*/ |
202 |
dl |
1.32 |
public long toMillis(long duration) { |
203 |
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throw new AbstractMethodError(); |
204 |
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} |
205 |
jsr166 |
1.29 |
|
206 |
dl |
1.27 |
/** |
207 |
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* Equivalent to <tt>SECONDS.convert(duration, this)</tt>. |
208 |
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* @param duration the duration |
209 |
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* @return the converted duration, |
210 |
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* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
211 |
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* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
212 |
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* @see #convert |
213 |
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*/ |
214 |
dl |
1.32 |
public long toSeconds(long duration) { |
215 |
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throw new AbstractMethodError(); |
216 |
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} |
217 |
jsr166 |
1.29 |
|
218 |
dl |
1.27 |
/** |
219 |
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* Equivalent to <tt>MINUTES.convert(duration, this)</tt>. |
220 |
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* @param duration the duration |
221 |
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* @return the converted duration, |
222 |
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* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
223 |
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* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
224 |
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* @see #convert |
225 |
dl |
1.31 |
* @since 1.6 |
226 |
dl |
1.27 |
*/ |
227 |
dl |
1.32 |
public long toMinutes(long duration) { |
228 |
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throw new AbstractMethodError(); |
229 |
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} |
230 |
jsr166 |
1.29 |
|
231 |
dl |
1.27 |
/** |
232 |
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* Equivalent to <tt>HOURS.convert(duration, this)</tt>. |
233 |
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* @param duration the duration |
234 |
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* @return the converted duration, |
235 |
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* or <tt>Long.MIN_VALUE</tt> if conversion would negatively |
236 |
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* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow. |
237 |
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* @see #convert |
238 |
dl |
1.31 |
* @since 1.6 |
239 |
dl |
1.27 |
*/ |
240 |
dl |
1.32 |
public long toHours(long duration) { |
241 |
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throw new AbstractMethodError(); |
242 |
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} |
243 |
jsr166 |
1.29 |
|
244 |
dl |
1.27 |
/** |
245 |
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* Equivalent to <tt>DAYS.convert(duration, this)</tt>. |
246 |
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* @param duration the duration |
247 |
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* @return the converted duration |
248 |
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* @see #convert |
249 |
dl |
1.31 |
* @since 1.6 |
250 |
dl |
1.27 |
*/ |
251 |
dl |
1.32 |
public long toDays(long duration) { |
252 |
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throw new AbstractMethodError(); |
253 |
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} |
254 |
jsr166 |
1.29 |
|
255 |
dl |
1.27 |
/** |
256 |
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* Utility to compute the excess-nanosecond argument to wait, |
257 |
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* sleep, join. |
258 |
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* @param d the duration |
259 |
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* @param m the number of milliseconds |
260 |
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* @return the number of nanoseconds |
261 |
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*/ |
262 |
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abstract int excessNanos(long d, long m); |
263 |
jsr166 |
1.29 |
|
264 |
dl |
1.27 |
/** |
265 |
jsr166 |
1.37 |
* Performs a timed {@link Object#wait(long, int) Object.wait} |
266 |
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* using this time unit. |
267 |
dl |
1.27 |
* This is a convenience method that converts timeout arguments |
268 |
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* into the form required by the <tt>Object.wait</tt> method. |
269 |
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* |
270 |
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* <p>For example, you could implement a blocking <tt>poll</tt> |
271 |
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* method (see {@link BlockingQueue#poll BlockingQueue.poll}) |
272 |
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* using: |
273 |
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* |
274 |
jsr166 |
1.36 |
* <pre> {@code |
275 |
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* public synchronized Object poll(long timeout, TimeUnit unit) |
276 |
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* throws InterruptedException { |
277 |
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* while (empty) { |
278 |
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* unit.timedWait(this, timeout); |
279 |
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* ... |
280 |
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* } |
281 |
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* }}</pre> |
282 |
dl |
1.27 |
* |
283 |
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* @param obj the object to wait on |
284 |
dl |
1.28 |
* @param timeout the maximum time to wait. If less than |
285 |
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* or equal to zero, do not wait at all. |
286 |
jsr166 |
1.37 |
* @throws InterruptedException if interrupted while waiting |
287 |
dl |
1.27 |
*/ |
288 |
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public void timedWait(Object obj, long timeout) |
289 |
jsr166 |
1.37 |
throws InterruptedException { |
290 |
dl |
1.27 |
if (timeout > 0) { |
291 |
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long ms = toMillis(timeout); |
292 |
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int ns = excessNanos(timeout, ms); |
293 |
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obj.wait(ms, ns); |
294 |
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} |
295 |
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} |
296 |
jsr166 |
1.29 |
|
297 |
dl |
1.27 |
/** |
298 |
jsr166 |
1.37 |
* Performs a timed {@link Thread#join(long, int) Thread.join} |
299 |
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* using this time unit. |
300 |
dl |
1.27 |
* This is a convenience method that converts time arguments into the |
301 |
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* form required by the <tt>Thread.join</tt> method. |
302 |
jsr166 |
1.37 |
* |
303 |
dl |
1.27 |
* @param thread the thread to wait for |
304 |
dl |
1.28 |
* @param timeout the maximum time to wait. If less than |
305 |
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* or equal to zero, do not wait at all. |
306 |
jsr166 |
1.37 |
* @throws InterruptedException if interrupted while waiting |
307 |
dl |
1.27 |
*/ |
308 |
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public void timedJoin(Thread thread, long timeout) |
309 |
jsr166 |
1.37 |
throws InterruptedException { |
310 |
dl |
1.27 |
if (timeout > 0) { |
311 |
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long ms = toMillis(timeout); |
312 |
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int ns = excessNanos(timeout, ms); |
313 |
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thread.join(ms, ns); |
314 |
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} |
315 |
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} |
316 |
jsr166 |
1.29 |
|
317 |
dl |
1.27 |
/** |
318 |
jsr166 |
1.37 |
* Performs a {@link Thread#sleep(long, int) Thread.sleep} using |
319 |
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* this time unit. |
320 |
dl |
1.27 |
* This is a convenience method that converts time arguments into the |
321 |
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* form required by the <tt>Thread.sleep</tt> method. |
322 |
jsr166 |
1.37 |
* |
323 |
dl |
1.28 |
* @param timeout the minimum time to sleep. If less than |
324 |
|
|
* or equal to zero, do not sleep at all. |
325 |
jsr166 |
1.37 |
* @throws InterruptedException if interrupted while sleeping |
326 |
dl |
1.27 |
*/ |
327 |
|
|
public void sleep(long timeout) throws InterruptedException { |
328 |
|
|
if (timeout > 0) { |
329 |
|
|
long ms = toMillis(timeout); |
330 |
|
|
int ns = excessNanos(timeout, ms); |
331 |
|
|
Thread.sleep(ms, ns); |
332 |
|
|
} |
333 |
|
|
} |
334 |
jsr166 |
1.29 |
|
335 |
tim |
1.1 |
} |