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dl |
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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jsr166 |
1.48 |
import java.time.temporal.ChronoUnit; |
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import java.util.Objects; |
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tim |
1.1 |
/** |
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jsr166 |
1.40 |
* A {@code TimeUnit} represents time durations at a given unit of |
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dl |
1.27 |
* 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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jsr166 |
1.40 |
* {@code TimeUnit} does not maintain time information, but only |
17 |
dl |
1.27 |
* 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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jsr166 |
1.40 |
* <p>A {@code TimeUnit} is mainly used to inform time-based methods |
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dl |
1.27 |
* 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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1.45 |
* <pre> {@code |
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jsr166 |
1.39 |
* Lock lock = ...; |
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* if (lock.tryLock(50L, TimeUnit.MILLISECONDS)) ...}</pre> |
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* |
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dl |
1.27 |
* while this code will timeout in 50 seconds: |
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jsr166 |
1.45 |
* <pre> {@code |
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jsr166 |
1.39 |
* 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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1.40 |
* same granularity as the given {@code TimeUnit}. |
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1.27 |
* |
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* @since 1.5 |
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* @author Doug Lea |
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*/ |
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dl |
1.20 |
public enum TimeUnit { |
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jsr166 |
1.43 |
/** |
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jsr166 |
1.47 |
* Time unit representing one thousandth of a microsecond. |
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jsr166 |
1.43 |
*/ |
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jsr166 |
1.56 |
NANOSECONDS(TimeUnit.NANO_SCALE), |
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1.43 |
/** |
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1.47 |
* Time unit representing one thousandth of a millisecond. |
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jsr166 |
1.43 |
*/ |
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jsr166 |
1.56 |
MICROSECONDS(TimeUnit.MICRO_SCALE), |
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jsr166 |
1.43 |
/** |
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jsr166 |
1.47 |
* Time unit representing one thousandth of a second. |
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jsr166 |
1.43 |
*/ |
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jsr166 |
1.56 |
MILLISECONDS(TimeUnit.MILLI_SCALE), |
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jsr166 |
1.43 |
/** |
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jsr166 |
1.47 |
* Time unit representing one second. |
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jsr166 |
1.43 |
*/ |
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jsr166 |
1.56 |
SECONDS(TimeUnit.SECOND_SCALE), |
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jsr166 |
1.43 |
/** |
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jsr166 |
1.47 |
* Time unit representing sixty seconds. |
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jsr166 |
1.44 |
* @since 1.6 |
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jsr166 |
1.43 |
*/ |
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jsr166 |
1.56 |
MINUTES(TimeUnit.MINUTE_SCALE), |
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jsr166 |
1.43 |
/** |
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jsr166 |
1.47 |
* Time unit representing sixty minutes. |
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jsr166 |
1.44 |
* @since 1.6 |
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jsr166 |
1.43 |
*/ |
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jsr166 |
1.56 |
HOURS(TimeUnit.HOUR_SCALE), |
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jsr166 |
1.43 |
/** |
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jsr166 |
1.47 |
* Time unit representing twenty four hours. |
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jsr166 |
1.44 |
* @since 1.6 |
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jsr166 |
1.43 |
*/ |
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jsr166 |
1.56 |
DAYS(TimeUnit.DAY_SCALE); |
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1.49 |
|
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// Scales as constants |
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private static final long NANO_SCALE = 1L; |
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private static final long MICRO_SCALE = 1000L * NANO_SCALE; |
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private static final long MILLI_SCALE = 1000L * MICRO_SCALE; |
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private static final long SECOND_SCALE = 1000L * MILLI_SCALE; |
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private static final long MINUTE_SCALE = 60L * SECOND_SCALE; |
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private static final long HOUR_SCALE = 60L * MINUTE_SCALE; |
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private static final long DAY_SCALE = 24L * HOUR_SCALE; |
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/* |
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* Instances cache conversion ratios and saturation cutoffs for |
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dl |
1.53 |
* the units up through SECONDS. Other cases compute them, in |
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dl |
1.52 |
* method cvt. |
91 |
dl |
1.49 |
*/ |
92 |
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private final long scale; |
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private final long maxNanos; |
95 |
dl |
1.53 |
private final long maxMicros; |
96 |
dl |
1.49 |
private final long maxMillis; |
97 |
dl |
1.52 |
private final long maxSecs; |
98 |
dl |
1.53 |
private final long microRatio; |
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private final int milliRatio; // fits in 32 bits |
100 |
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private final int secRatio; // fits in 32 bits |
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|
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jsr166 |
1.59 |
private TimeUnit(long s) { |
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dl |
1.53 |
this.scale = s; |
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this.maxNanos = Long.MAX_VALUE / s; |
105 |
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long ur = (s >= MICRO_SCALE) ? (s / MICRO_SCALE) : (MICRO_SCALE / s); |
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this.microRatio = ur; |
107 |
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this.maxMicros = Long.MAX_VALUE / ur; |
108 |
jsr166 |
1.55 |
long mr = (s >= MILLI_SCALE) ? (s / MILLI_SCALE) : (MILLI_SCALE / s); |
109 |
dl |
1.52 |
this.milliRatio = (int)mr; |
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this.maxMillis = Long.MAX_VALUE / mr; |
111 |
dl |
1.53 |
long sr = (s >= SECOND_SCALE) ? (s / SECOND_SCALE) : (SECOND_SCALE / s); |
112 |
dl |
1.52 |
this.secRatio = (int)sr; |
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this.maxSecs = Long.MAX_VALUE / sr; |
114 |
dl |
1.49 |
} |
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/** |
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* General conversion utility. |
118 |
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* |
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* @param d duration |
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jsr166 |
1.57 |
* @param dst result unit scale |
121 |
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* @param src source unit scale |
122 |
dl |
1.49 |
*/ |
123 |
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private static long cvt(long d, long dst, long src) { |
124 |
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long r, m; |
125 |
dl |
1.50 |
if (src == dst) |
126 |
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return d; |
127 |
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else if (src < dst) |
128 |
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return d / (dst / src); |
129 |
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else if (d > (m = Long.MAX_VALUE / (r = src / dst))) |
130 |
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return Long.MAX_VALUE; |
131 |
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else if (d < -m) |
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return Long.MIN_VALUE; |
133 |
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else |
134 |
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return d * r; |
135 |
dl |
1.49 |
} |
136 |
dl |
1.32 |
|
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dl |
1.27 |
/** |
138 |
jsr166 |
1.42 |
* Converts the given time duration in the given unit to this unit. |
139 |
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* Conversions from finer to coarser granularities truncate, so |
140 |
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* lose precision. For example, converting {@code 999} milliseconds |
141 |
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* to seconds results in {@code 0}. Conversions from coarser to |
142 |
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* finer granularities with arguments that would numerically |
143 |
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* overflow saturate to {@code Long.MIN_VALUE} if negative or |
144 |
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* {@code Long.MAX_VALUE} if positive. |
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jsr166 |
1.33 |
* |
146 |
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* <p>For example, to convert 10 minutes to milliseconds, use: |
147 |
jsr166 |
1.40 |
* {@code TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)} |
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dl |
1.27 |
* |
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jsr166 |
1.40 |
* @param sourceDuration the time duration in the given {@code sourceUnit} |
150 |
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* @param sourceUnit the unit of the {@code sourceDuration} argument |
151 |
dl |
1.27 |
* @return the converted duration in this unit, |
152 |
jsr166 |
1.58 |
* or {@code Long.MIN_VALUE} if conversion would negatively overflow, |
153 |
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* or {@code Long.MAX_VALUE} if it would positively overflow. |
154 |
dl |
1.27 |
*/ |
155 |
dl |
1.32 |
public long convert(long sourceDuration, TimeUnit sourceUnit) { |
156 |
dl |
1.53 |
switch (this) { |
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jsr166 |
1.54 |
case NANOSECONDS: return sourceUnit.toNanos(sourceDuration); |
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dl |
1.53 |
case MICROSECONDS: return sourceUnit.toMicros(sourceDuration); |
159 |
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case MILLISECONDS: return sourceUnit.toMillis(sourceDuration); |
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jsr166 |
1.54 |
case SECONDS: return sourceUnit.toSeconds(sourceDuration); |
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dl |
1.53 |
default: return cvt(sourceDuration, scale, sourceUnit.scale); |
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} |
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dl |
1.32 |
} |
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jsr166 |
1.29 |
|
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dl |
1.27 |
/** |
166 |
jsr166 |
1.41 |
* Equivalent to |
167 |
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* {@link #convert(long, TimeUnit) NANOSECONDS.convert(duration, this)}. |
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dl |
1.27 |
* @param duration the duration |
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* @return the converted duration, |
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jsr166 |
1.58 |
* or {@code Long.MIN_VALUE} if conversion would negatively overflow, |
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* or {@code Long.MAX_VALUE} if it would positively overflow. |
172 |
dl |
1.27 |
*/ |
173 |
dl |
1.32 |
public long toNanos(long duration) { |
174 |
dl |
1.49 |
long s, m; |
175 |
dl |
1.50 |
if ((s = scale) == NANO_SCALE) |
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return duration; |
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else if (duration > (m = maxNanos)) |
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return Long.MAX_VALUE; |
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else if (duration < -m) |
180 |
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return Long.MIN_VALUE; |
181 |
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else |
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return duration * s; |
183 |
dl |
1.32 |
} |
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jsr166 |
1.29 |
|
185 |
dl |
1.27 |
/** |
186 |
jsr166 |
1.41 |
* Equivalent to |
187 |
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* {@link #convert(long, TimeUnit) MICROSECONDS.convert(duration, this)}. |
188 |
dl |
1.27 |
* @param duration the duration |
189 |
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* @return the converted duration, |
190 |
jsr166 |
1.58 |
* or {@code Long.MIN_VALUE} if conversion would negatively overflow, |
191 |
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* or {@code Long.MAX_VALUE} if it would positively overflow. |
192 |
dl |
1.27 |
*/ |
193 |
dl |
1.32 |
public long toMicros(long duration) { |
194 |
dl |
1.53 |
long s, m; |
195 |
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if ((s = scale) == MICRO_SCALE) |
196 |
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return duration; |
197 |
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else if (s < MICRO_SCALE) |
198 |
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return duration / microRatio; |
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else if (duration > (m = maxMicros)) |
200 |
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return Long.MAX_VALUE; |
201 |
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else if (duration < -m) |
202 |
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return Long.MIN_VALUE; |
203 |
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else |
204 |
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return duration * microRatio; |
205 |
dl |
1.32 |
} |
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jsr166 |
1.29 |
|
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dl |
1.27 |
/** |
208 |
jsr166 |
1.41 |
* Equivalent to |
209 |
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* {@link #convert(long, TimeUnit) MILLISECONDS.convert(duration, this)}. |
210 |
dl |
1.27 |
* @param duration the duration |
211 |
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* @return the converted duration, |
212 |
jsr166 |
1.58 |
* or {@code Long.MIN_VALUE} if conversion would negatively overflow, |
213 |
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* or {@code Long.MAX_VALUE} if it would positively overflow. |
214 |
dl |
1.27 |
*/ |
215 |
dl |
1.32 |
public long toMillis(long duration) { |
216 |
dl |
1.49 |
long s, m; |
217 |
dl |
1.50 |
if ((s = scale) == MILLI_SCALE) |
218 |
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return duration; |
219 |
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else if (s < MILLI_SCALE) |
220 |
dl |
1.52 |
return duration / milliRatio; |
221 |
dl |
1.50 |
else if (duration > (m = maxMillis)) |
222 |
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return Long.MAX_VALUE; |
223 |
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else if (duration < -m) |
224 |
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return Long.MIN_VALUE; |
225 |
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else |
226 |
dl |
1.52 |
return duration * milliRatio; |
227 |
dl |
1.32 |
} |
228 |
jsr166 |
1.29 |
|
229 |
dl |
1.27 |
/** |
230 |
jsr166 |
1.41 |
* Equivalent to |
231 |
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* {@link #convert(long, TimeUnit) SECONDS.convert(duration, this)}. |
232 |
dl |
1.27 |
* @param duration the duration |
233 |
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* @return the converted duration, |
234 |
jsr166 |
1.58 |
* or {@code Long.MIN_VALUE} if conversion would negatively overflow, |
235 |
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* or {@code Long.MAX_VALUE} if it would positively overflow. |
236 |
dl |
1.27 |
*/ |
237 |
dl |
1.32 |
public long toSeconds(long duration) { |
238 |
dl |
1.52 |
long s, m; |
239 |
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if ((s = scale) == SECOND_SCALE) |
240 |
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return duration; |
241 |
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else if (s < SECOND_SCALE) |
242 |
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return duration / secRatio; |
243 |
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else if (duration > (m = maxSecs)) |
244 |
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return Long.MAX_VALUE; |
245 |
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else if (duration < -m) |
246 |
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return Long.MIN_VALUE; |
247 |
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else |
248 |
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return duration * secRatio; |
249 |
dl |
1.32 |
} |
250 |
jsr166 |
1.29 |
|
251 |
dl |
1.27 |
/** |
252 |
jsr166 |
1.41 |
* Equivalent to |
253 |
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* {@link #convert(long, TimeUnit) MINUTES.convert(duration, this)}. |
254 |
dl |
1.27 |
* @param duration the duration |
255 |
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* @return the converted duration, |
256 |
jsr166 |
1.58 |
* or {@code Long.MIN_VALUE} if conversion would negatively overflow, |
257 |
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* or {@code Long.MAX_VALUE} if it would positively overflow. |
258 |
dl |
1.31 |
* @since 1.6 |
259 |
dl |
1.27 |
*/ |
260 |
dl |
1.32 |
public long toMinutes(long duration) { |
261 |
dl |
1.49 |
return cvt(duration, MINUTE_SCALE, scale); |
262 |
dl |
1.32 |
} |
263 |
jsr166 |
1.29 |
|
264 |
dl |
1.27 |
/** |
265 |
jsr166 |
1.41 |
* Equivalent to |
266 |
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* {@link #convert(long, TimeUnit) HOURS.convert(duration, this)}. |
267 |
dl |
1.27 |
* @param duration the duration |
268 |
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* @return the converted duration, |
269 |
jsr166 |
1.58 |
* or {@code Long.MIN_VALUE} if conversion would negatively overflow, |
270 |
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* or {@code Long.MAX_VALUE} if it would positively overflow. |
271 |
dl |
1.31 |
* @since 1.6 |
272 |
dl |
1.27 |
*/ |
273 |
dl |
1.32 |
public long toHours(long duration) { |
274 |
dl |
1.49 |
return cvt(duration, HOUR_SCALE, scale); |
275 |
dl |
1.32 |
} |
276 |
jsr166 |
1.29 |
|
277 |
dl |
1.27 |
/** |
278 |
jsr166 |
1.41 |
* Equivalent to |
279 |
|
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* {@link #convert(long, TimeUnit) DAYS.convert(duration, this)}. |
280 |
dl |
1.27 |
* @param duration the duration |
281 |
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* @return the converted duration |
282 |
dl |
1.31 |
* @since 1.6 |
283 |
dl |
1.27 |
*/ |
284 |
dl |
1.32 |
public long toDays(long duration) { |
285 |
dl |
1.49 |
return cvt(duration, DAY_SCALE, scale); |
286 |
dl |
1.32 |
} |
287 |
jsr166 |
1.29 |
|
288 |
dl |
1.27 |
/** |
289 |
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* Utility to compute the excess-nanosecond argument to wait, |
290 |
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* sleep, join. |
291 |
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* @param d the duration |
292 |
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* @param m the number of milliseconds |
293 |
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* @return the number of nanoseconds |
294 |
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*/ |
295 |
dl |
1.49 |
private int excessNanos(long d, long m) { |
296 |
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long s; |
297 |
dl |
1.50 |
if ((s = scale) == NANO_SCALE) |
298 |
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return (int)(d - (m * MILLI_SCALE)); |
299 |
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else if (s == MICRO_SCALE) |
300 |
|
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return (int)((d * 1000L) - (m * MILLI_SCALE)); |
301 |
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else |
302 |
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return 0; |
303 |
dl |
1.49 |
} |
304 |
jsr166 |
1.29 |
|
305 |
dl |
1.27 |
/** |
306 |
jsr166 |
1.37 |
* Performs a timed {@link Object#wait(long, int) Object.wait} |
307 |
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* using this time unit. |
308 |
dl |
1.27 |
* This is a convenience method that converts timeout arguments |
309 |
jsr166 |
1.40 |
* into the form required by the {@code Object.wait} method. |
310 |
dl |
1.27 |
* |
311 |
jsr166 |
1.60 |
* <p>For example, you could implement a blocking {@code poll} method |
312 |
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* (see {@link BlockingQueue#poll(long, TimeUnit) BlockingQueue.poll}) |
313 |
dl |
1.27 |
* using: |
314 |
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* |
315 |
jsr166 |
1.45 |
* <pre> {@code |
316 |
jsr166 |
1.61 |
* public synchronized E poll(long timeout, TimeUnit unit) |
317 |
jsr166 |
1.36 |
* throws InterruptedException { |
318 |
|
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* while (empty) { |
319 |
|
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* unit.timedWait(this, timeout); |
320 |
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* ... |
321 |
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* } |
322 |
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* }}</pre> |
323 |
dl |
1.27 |
* |
324 |
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* @param obj the object to wait on |
325 |
dl |
1.28 |
* @param timeout the maximum time to wait. If less than |
326 |
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* or equal to zero, do not wait at all. |
327 |
jsr166 |
1.37 |
* @throws InterruptedException if interrupted while waiting |
328 |
dl |
1.27 |
*/ |
329 |
|
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public void timedWait(Object obj, long timeout) |
330 |
jsr166 |
1.37 |
throws InterruptedException { |
331 |
dl |
1.27 |
if (timeout > 0) { |
332 |
|
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long ms = toMillis(timeout); |
333 |
|
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int ns = excessNanos(timeout, ms); |
334 |
|
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obj.wait(ms, ns); |
335 |
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} |
336 |
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} |
337 |
jsr166 |
1.29 |
|
338 |
dl |
1.27 |
/** |
339 |
jsr166 |
1.37 |
* Performs a timed {@link Thread#join(long, int) Thread.join} |
340 |
|
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* using this time unit. |
341 |
dl |
1.27 |
* This is a convenience method that converts time arguments into the |
342 |
jsr166 |
1.40 |
* form required by the {@code Thread.join} method. |
343 |
jsr166 |
1.37 |
* |
344 |
dl |
1.27 |
* @param thread the thread to wait for |
345 |
dl |
1.28 |
* @param timeout the maximum time to wait. If less than |
346 |
|
|
* or equal to zero, do not wait at all. |
347 |
jsr166 |
1.37 |
* @throws InterruptedException if interrupted while waiting |
348 |
dl |
1.27 |
*/ |
349 |
|
|
public void timedJoin(Thread thread, long timeout) |
350 |
jsr166 |
1.37 |
throws InterruptedException { |
351 |
dl |
1.27 |
if (timeout > 0) { |
352 |
|
|
long ms = toMillis(timeout); |
353 |
|
|
int ns = excessNanos(timeout, ms); |
354 |
|
|
thread.join(ms, ns); |
355 |
|
|
} |
356 |
|
|
} |
357 |
jsr166 |
1.29 |
|
358 |
dl |
1.27 |
/** |
359 |
jsr166 |
1.37 |
* Performs a {@link Thread#sleep(long, int) Thread.sleep} using |
360 |
|
|
* this time unit. |
361 |
dl |
1.27 |
* This is a convenience method that converts time arguments into the |
362 |
jsr166 |
1.40 |
* form required by the {@code Thread.sleep} method. |
363 |
jsr166 |
1.37 |
* |
364 |
dl |
1.28 |
* @param timeout the minimum time to sleep. If less than |
365 |
|
|
* or equal to zero, do not sleep at all. |
366 |
jsr166 |
1.37 |
* @throws InterruptedException if interrupted while sleeping |
367 |
dl |
1.27 |
*/ |
368 |
|
|
public void sleep(long timeout) throws InterruptedException { |
369 |
|
|
if (timeout > 0) { |
370 |
|
|
long ms = toMillis(timeout); |
371 |
|
|
int ns = excessNanos(timeout, ms); |
372 |
|
|
Thread.sleep(ms, ns); |
373 |
|
|
} |
374 |
|
|
} |
375 |
jsr166 |
1.29 |
|
376 |
jsr166 |
1.48 |
/** |
377 |
|
|
* Converts this {@code TimeUnit} to the equivalent {@code ChronoUnit}. |
378 |
|
|
* |
379 |
|
|
* @return the converted equivalent ChronoUnit |
380 |
|
|
* @since 9 |
381 |
|
|
*/ |
382 |
|
|
public ChronoUnit toChronoUnit() { |
383 |
|
|
switch (this) { |
384 |
|
|
case NANOSECONDS: return ChronoUnit.NANOS; |
385 |
|
|
case MICROSECONDS: return ChronoUnit.MICROS; |
386 |
|
|
case MILLISECONDS: return ChronoUnit.MILLIS; |
387 |
|
|
case SECONDS: return ChronoUnit.SECONDS; |
388 |
|
|
case MINUTES: return ChronoUnit.MINUTES; |
389 |
|
|
case HOURS: return ChronoUnit.HOURS; |
390 |
|
|
case DAYS: return ChronoUnit.DAYS; |
391 |
|
|
default: throw new AssertionError(); |
392 |
|
|
} |
393 |
|
|
} |
394 |
|
|
|
395 |
|
|
/** |
396 |
|
|
* Converts a {@code ChronoUnit} to the equivalent {@code TimeUnit}. |
397 |
|
|
* |
398 |
|
|
* @param chronoUnit the ChronoUnit to convert |
399 |
|
|
* @return the converted equivalent TimeUnit |
400 |
|
|
* @throws IllegalArgumentException if {@code chronoUnit} has no |
401 |
|
|
* equivalent TimeUnit |
402 |
|
|
* @throws NullPointerException if {@code chronoUnit} is null |
403 |
|
|
* @since 9 |
404 |
|
|
*/ |
405 |
|
|
public static TimeUnit of(ChronoUnit chronoUnit) { |
406 |
|
|
switch (Objects.requireNonNull(chronoUnit, "chronoUnit")) { |
407 |
|
|
case NANOS: return TimeUnit.NANOSECONDS; |
408 |
|
|
case MICROS: return TimeUnit.MICROSECONDS; |
409 |
|
|
case MILLIS: return TimeUnit.MILLISECONDS; |
410 |
|
|
case SECONDS: return TimeUnit.SECONDS; |
411 |
|
|
case MINUTES: return TimeUnit.MINUTES; |
412 |
|
|
case HOURS: return TimeUnit.HOURS; |
413 |
|
|
case DAYS: return TimeUnit.DAYS; |
414 |
|
|
default: |
415 |
|
|
throw new IllegalArgumentException( |
416 |
|
|
"No TimeUnit equivalent for " + chronoUnit); |
417 |
|
|
} |
418 |
|
|
} |
419 |
|
|
|
420 |
tim |
1.1 |
} |