util/concurrent/TimeUnit.java

/*
 * 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 {@code 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
 * {@code 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.
 *
 * <p>A {@code 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:
 *
 *  <pre> {@code
 * Lock lock = ...;
 * if (lock.tryLock(50L, TimeUnit.MILLISECONDS)) ...}</pre>
 *
 * while this code will timeout in 50 seconds:
 *  <pre> {@code
 * Lock lock = ...;
 * if (lock.tryLock(50L, TimeUnit.SECONDS)) ...}</pre>
 *
 * 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 {@code 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
     * {@code 999} milliseconds to seconds results in
     * {@code 0}. Conversions from coarser to finer granularities
     * with arguments that would numerically overflow saturate to
     * {@code Long.MIN_VALUE} if negative or {@code Long.MAX_VALUE}
     * if positive.
     *
     * <p>For example, to convert 10 minutes to milliseconds, use:
     * {@code TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)}
     *
     * @param sourceDuration the time duration in the given {@code sourceUnit}
     * @param sourceUnit the unit of the {@code sourceDuration} argument
     * @return the converted duration in this unit,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     */
    public long convert(long sourceDuration, TimeUnit sourceUnit) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) NANOSECONDS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     */
    public long toNanos(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) MICROSECONDS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     */
    public long toMicros(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) MILLISECONDS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     */
    public long toMillis(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) SECONDS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     */
    public long toSeconds(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) MINUTES.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     * @since 1.6
     */
    public long toMinutes(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) HOURS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration,
     * or {@code Long.MIN_VALUE} if conversion would negatively
     * overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
     * @since 1.6
     */
    public long toHours(long duration) {
        throw new AbstractMethodError();
    }

    /**
     * Equivalent to
     * {@link #convert(long, TimeUnit) DAYS.convert(duration, this)}.
     * @param duration the duration
     * @return the converted duration
     * @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 {@code Object.wait} method.
     *
     * <p>For example, you could implement a blocking {@code poll}
     * method (see {@link BlockingQueue#poll BlockingQueue.poll})
     * using:
     *
     *  <pre> {@code
     * public synchronized Object poll(long timeout, TimeUnit unit)
     *     throws InterruptedException {
     *   while (empty) {
     *     unit.timedWait(this, timeout);
     *     ...
     *   }
     * }}</pre>
     *
     * @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 {@code 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 {@code 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);
        }
    }

}
Revision:	1.41
Committed:	Mon Feb 11 04:29:50 2013 UTC (11 years, 3 months ago) by jsr166
Branch:	MAIN
Changes since 1.40:	+14 -14 lines
Log Message:	javadoc link readability
#	User	Rev	Content
1	dl	1.2	/*
2	jsr166	1.35	* Written by Doug Lea with assistance from members of JCP JSR-166
3			* Expert Group and released to the public domain, as explained at
4	jsr166	1.38	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.35	*/
6	dl	1.2
7	tim	1.1	package java.util.concurrent;
8
9			/**
10	jsr166	1.40	* A {@code TimeUnit} represents time durations at a given unit of
11	dl	1.27	* granularity and provides utility methods to convert across units,
12			* and to perform timing and delay operations in these units. A
13	jsr166	1.40	* {@code TimeUnit} does not maintain time information, but only
14	dl	1.27	* helps organize and use time representations that may be maintained
15			* separately across various contexts. A nanosecond is defined as one
16			* thousandth of a microsecond, a microsecond as one thousandth of a
17			* millisecond, a millisecond as one thousandth of a second, a minute
18			* as sixty seconds, an hour as sixty minutes, and a day as twenty four
19			* hours.
20			*
21	jsr166	1.40	* <p>A {@code TimeUnit} is mainly used to inform time-based methods
22	dl	1.27	* how a given timing parameter should be interpreted. For example,
23			* the following code will timeout in 50 milliseconds if the {@link
24			* java.util.concurrent.locks.Lock lock} is not available:
25			*
26	jsr166	1.39	* <pre> {@code
27			* Lock lock = ...;
28			* if (lock.tryLock(50L, TimeUnit.MILLISECONDS)) ...}</pre>
29			*
30	dl	1.27	* while this code will timeout in 50 seconds:
31	jsr166	1.39	* <pre> {@code
32			* Lock lock = ...;
33			* if (lock.tryLock(50L, TimeUnit.SECONDS)) ...}</pre>
34	dl	1.27	*
35			* Note however, that there is no guarantee that a particular timeout
36			* implementation will be able to notice the passage of time at the
37	jsr166	1.40	* same granularity as the given {@code TimeUnit}.
38	dl	1.27	*
39			* @since 1.5
40			* @author Doug Lea
41			*/
42	dl	1.20	public enum TimeUnit {
43	dl	1.34	NANOSECONDS {
44	dl	1.27	public long toNanos(long d) { return d; }
45			public long toMicros(long d) { return d/(C1/C0); }
46			public long toMillis(long d) { return d/(C2/C0); }
47			public long toSeconds(long d) { return d/(C3/C0); }
48			public long toMinutes(long d) { return d/(C4/C0); }
49			public long toHours(long d) { return d/(C5/C0); }
50			public long toDays(long d) { return d/(C6/C0); }
51			public long convert(long d, TimeUnit u) { return u.toNanos(d); }
52			int excessNanos(long d, long m) { return (int)(d - (m*C2)); }
53			},
54	dl	1.34	MICROSECONDS {
55	dl	1.27	public long toNanos(long d) { return x(d, C1/C0, MAX/(C1/C0)); }
56			public long toMicros(long d) { return d; }
57			public long toMillis(long d) { return d/(C2/C1); }
58			public long toSeconds(long d) { return d/(C3/C1); }
59			public long toMinutes(long d) { return d/(C4/C1); }
60			public long toHours(long d) { return d/(C5/C1); }
61			public long toDays(long d) { return d/(C6/C1); }
62			public long convert(long d, TimeUnit u) { return u.toMicros(d); }
63			int excessNanos(long d, long m) { return (int)((dC1) - (mC2)); }
64			},
65	dl	1.34	MILLISECONDS {
66	dl	1.27	public long toNanos(long d) { return x(d, C2/C0, MAX/(C2/C0)); }
67			public long toMicros(long d) { return x(d, C2/C1, MAX/(C2/C1)); }
68			public long toMillis(long d) { return d; }
69			public long toSeconds(long d) { return d/(C3/C2); }
70			public long toMinutes(long d) { return d/(C4/C2); }
71			public long toHours(long d) { return d/(C5/C2); }
72			public long toDays(long d) { return d/(C6/C2); }
73			public long convert(long d, TimeUnit u) { return u.toMillis(d); }
74			int excessNanos(long d, long m) { return 0; }
75			},
76	dl	1.34	SECONDS {
77	dl	1.27	public long toNanos(long d) { return x(d, C3/C0, MAX/(C3/C0)); }
78			public long toMicros(long d) { return x(d, C3/C1, MAX/(C3/C1)); }
79			public long toMillis(long d) { return x(d, C3/C2, MAX/(C3/C2)); }
80			public long toSeconds(long d) { return d; }
81			public long toMinutes(long d) { return d/(C4/C3); }
82			public long toHours(long d) { return d/(C5/C3); }
83			public long toDays(long d) { return d/(C6/C3); }
84			public long convert(long d, TimeUnit u) { return u.toSeconds(d); }
85			int excessNanos(long d, long m) { return 0; }
86			},
87	dl	1.34	MINUTES {
88	dl	1.27	public long toNanos(long d) { return x(d, C4/C0, MAX/(C4/C0)); }
89			public long toMicros(long d) { return x(d, C4/C1, MAX/(C4/C1)); }
90			public long toMillis(long d) { return x(d, C4/C2, MAX/(C4/C2)); }
91			public long toSeconds(long d) { return x(d, C4/C3, MAX/(C4/C3)); }
92			public long toMinutes(long d) { return d; }
93			public long toHours(long d) { return d/(C5/C4); }
94			public long toDays(long d) { return d/(C6/C4); }
95			public long convert(long d, TimeUnit u) { return u.toMinutes(d); }
96			int excessNanos(long d, long m) { return 0; }
97			},
98	dl	1.34	HOURS {
99	dl	1.27	public long toNanos(long d) { return x(d, C5/C0, MAX/(C5/C0)); }
100			public long toMicros(long d) { return x(d, C5/C1, MAX/(C5/C1)); }
101			public long toMillis(long d) { return x(d, C5/C2, MAX/(C5/C2)); }
102			public long toSeconds(long d) { return x(d, C5/C3, MAX/(C5/C3)); }
103			public long toMinutes(long d) { return x(d, C5/C4, MAX/(C5/C4)); }
104			public long toHours(long d) { return d; }
105			public long toDays(long d) { return d/(C6/C5); }
106			public long convert(long d, TimeUnit u) { return u.toHours(d); }
107			int excessNanos(long d, long m) { return 0; }
108			},
109	dl	1.34	DAYS {
110	dl	1.27	public long toNanos(long d) { return x(d, C6/C0, MAX/(C6/C0)); }
111			public long toMicros(long d) { return x(d, C6/C1, MAX/(C6/C1)); }
112			public long toMillis(long d) { return x(d, C6/C2, MAX/(C6/C2)); }
113			public long toSeconds(long d) { return x(d, C6/C3, MAX/(C6/C3)); }
114			public long toMinutes(long d) { return x(d, C6/C4, MAX/(C6/C4)); }
115			public long toHours(long d) { return x(d, C6/C5, MAX/(C6/C5)); }
116			public long toDays(long d) { return d; }
117			public long convert(long d, TimeUnit u) { return u.toDays(d); }
118			int excessNanos(long d, long m) { return 0; }
119			};
120	jsr166	1.29
121	dl	1.27	// Handy constants for conversion methods
122			static final long C0 = 1L;
123			static final long C1 = C0 * 1000L;
124			static final long C2 = C1 * 1000L;
125			static final long C3 = C2 * 1000L;
126			static final long C4 = C3 * 60L;
127			static final long C5 = C4 * 60L;
128			static final long C6 = C5 * 24L;
129	jsr166	1.29
130	dl	1.27	static final long MAX = Long.MAX_VALUE;
131	jsr166	1.29
132	dl	1.27	/**
133			* Scale d by m, checking for overflow.
134			* This has a short name to make above code more readable.
135			*/
136			static long x(long d, long m, long over) {
137			if (d > over) return Long.MAX_VALUE;
138			if (d < -over) return Long.MIN_VALUE;
139			return d * m;
140			}
141	jsr166	1.29
142	jsr166	1.33	// To maintain full signature compatibility with 1.5, and to improve the
143			// clarity of the generated javadoc (see 6287639: Abstract methods in
144			// enum classes should not be listed as abstract), method convert
145			// etc. are not declared abstract but otherwise act as abstract methods.
146	dl	1.32
147	dl	1.27	/**
148			* Convert the given time duration in the given unit to this
149			* unit. Conversions from finer to coarser granularities
150			* truncate, so lose precision. For example converting
151	jsr166	1.40	* {@code 999} milliseconds to seconds results in
152			* {@code 0}. Conversions from coarser to finer granularities
153	dl	1.27	* with arguments that would numerically overflow saturate to
154	jsr166	1.40	* {@code Long.MIN_VALUE} if negative or {@code Long.MAX_VALUE}
155	dl	1.27	* if positive.
156	jsr166	1.33	*
157			* <p>For example, to convert 10 minutes to milliseconds, use:
158	jsr166	1.40	* {@code TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)}
159	dl	1.27	*
160	jsr166	1.40	* @param sourceDuration the time duration in the given {@code sourceUnit}
161			* @param sourceUnit the unit of the {@code sourceDuration} argument
162	dl	1.27	* @return the converted duration in this unit,
163	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
164			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
165	dl	1.27	*/
166	dl	1.32	public long convert(long sourceDuration, TimeUnit sourceUnit) {
167			throw new AbstractMethodError();
168			}
169	jsr166	1.29
170	dl	1.27	/**
171	jsr166	1.41	* Equivalent to
172			* {@link #convert(long, TimeUnit) NANOSECONDS.convert(duration, this)}.
173	dl	1.27	* @param duration the duration
174			* @return the converted duration,
175	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
176			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
177	dl	1.27	*/
178	dl	1.32	public long toNanos(long duration) {
179			throw new AbstractMethodError();
180			}
181	jsr166	1.29
182	dl	1.27	/**
183	jsr166	1.41	* Equivalent to
184			* {@link #convert(long, TimeUnit) MICROSECONDS.convert(duration, this)}.
185	dl	1.27	* @param duration the duration
186			* @return the converted duration,
187	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
188			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
189	dl	1.27	*/
190	dl	1.32	public long toMicros(long duration) {
191			throw new AbstractMethodError();
192			}
193	jsr166	1.29
194	dl	1.27	/**
195	jsr166	1.41	* Equivalent to
196			* {@link #convert(long, TimeUnit) MILLISECONDS.convert(duration, this)}.
197	dl	1.27	* @param duration the duration
198			* @return the converted duration,
199	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
200			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
201	dl	1.27	*/
202	dl	1.32	public long toMillis(long duration) {
203			throw new AbstractMethodError();
204			}
205	jsr166	1.29
206	dl	1.27	/**
207	jsr166	1.41	* Equivalent to
208			* {@link #convert(long, TimeUnit) SECONDS.convert(duration, this)}.
209	dl	1.27	* @param duration the duration
210			* @return the converted duration,
211	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
212			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
213	dl	1.27	*/
214	dl	1.32	public long toSeconds(long duration) {
215			throw new AbstractMethodError();
216			}
217	jsr166	1.29
218	dl	1.27	/**
219	jsr166	1.41	* Equivalent to
220			* {@link #convert(long, TimeUnit) MINUTES.convert(duration, this)}.
221	dl	1.27	* @param duration the duration
222			* @return the converted duration,
223	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
224			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
225	dl	1.31	* @since 1.6
226	dl	1.27	*/
227	dl	1.32	public long toMinutes(long duration) {
228			throw new AbstractMethodError();
229			}
230	jsr166	1.29
231	dl	1.27	/**
232	jsr166	1.41	* Equivalent to
233			* {@link #convert(long, TimeUnit) HOURS.convert(duration, this)}.
234	dl	1.27	* @param duration the duration
235			* @return the converted duration,
236	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
237			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
238	dl	1.31	* @since 1.6
239	dl	1.27	*/
240	dl	1.32	public long toHours(long duration) {
241			throw new AbstractMethodError();
242			}
243	jsr166	1.29
244	dl	1.27	/**
245	jsr166	1.41	* Equivalent to
246			* {@link #convert(long, TimeUnit) DAYS.convert(duration, this)}.
247	dl	1.27	* @param duration the duration
248			* @return the converted duration
249	dl	1.31	* @since 1.6
250	dl	1.27	*/
251	dl	1.32	public long toDays(long duration) {
252			throw new AbstractMethodError();
253			}
254	jsr166	1.29
255	dl	1.27	/**
256			* Utility to compute the excess-nanosecond argument to wait,
257			* sleep, join.
258			* @param d the duration
259			* @param m the number of milliseconds
260			* @return the number of nanoseconds
261			*/
262			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			* using this time unit.
267	dl	1.27	* This is a convenience method that converts timeout arguments
268	jsr166	1.40	* into the form required by the {@code Object.wait} method.
269	dl	1.27	*
270	jsr166	1.40	* <p>For example, you could implement a blocking {@code poll}
271	dl	1.27	* method (see {@link BlockingQueue#poll BlockingQueue.poll})
272			* using:
273			*
274	jsr166	1.36	* <pre> {@code
275			* public synchronized Object poll(long timeout, TimeUnit unit)
276			* throws InterruptedException {
277			* while (empty) {
278			* unit.timedWait(this, timeout);
279			* ...
280			* }
281			* }}</pre>
282	dl	1.27	*
283			* @param obj the object to wait on
284	dl	1.28	* @param timeout the maximum time to wait. If less than
285			* or equal to zero, do not wait at all.
286	jsr166	1.37	* @throws InterruptedException if interrupted while waiting
287	dl	1.27	*/
288			public void timedWait(Object obj, long timeout)
289	jsr166	1.37	throws InterruptedException {
290	dl	1.27	if (timeout > 0) {
291			long ms = toMillis(timeout);
292			int ns = excessNanos(timeout, ms);
293			obj.wait(ms, ns);
294			}
295			}
296	jsr166	1.29
297	dl	1.27	/**
298	jsr166	1.37	* Performs a timed {@link Thread#join(long, int) Thread.join}
299			* using this time unit.
300	dl	1.27	* This is a convenience method that converts time arguments into the
301	jsr166	1.40	* form required by the {@code Thread.join} 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			* or equal to zero, do not wait at all.
306	jsr166	1.37	* @throws InterruptedException if interrupted while waiting
307	dl	1.27	*/
308			public void timedJoin(Thread thread, long timeout)
309	jsr166	1.37	throws InterruptedException {
310	dl	1.27	if (timeout > 0) {
311			long ms = toMillis(timeout);
312			int ns = excessNanos(timeout, ms);
313			thread.join(ms, ns);
314			}
315			}
316	jsr166	1.29
317	dl	1.27	/**
318	jsr166	1.37	* Performs a {@link Thread#sleep(long, int) Thread.sleep} using
319			* this time unit.
320	dl	1.27	* This is a convenience method that converts time arguments into the
321	jsr166	1.40	* form required by the {@code Thread.sleep} 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	}