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 {
    /**
     * Time unit representing one thousandth of a microsecond.
     */
    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)); }
    },

    /**
     * Time unit representing one thousandth of a millisecond.
     */
    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)); }
    },

    /**
     * Time unit representing one thousandth of a second.
     */
    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; }
    },

    /**
     * Time unit representing one second.
     */
    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; }
    },

    /**
     * Time unit representing sixty seconds.
     * @since 1.6
     */
    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; }
    },

    /**
     * Time unit representing sixty minutes.
     * @since 1.6
     */
    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; }
    },

    /**
     * Time unit representing twenty four hours.
     * @since 1.6
     */
    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.

    /**
     * Converts 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:	1.47
Committed:	Sun Sep 20 17:03:23 2015 UTC (8 years, 8 months ago) by jsr166
Branch:	MAIN
Changes since 1.46:	+7 -7 lines
Log Message:	Terminate javadoc with a period.
#	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	1.45	* <pre> {@code
27	jsr166	1.39	* 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	1.45	* <pre> {@code
32	jsr166	1.39	* 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	jsr166	1.43	/**
44	jsr166	1.47	* Time unit representing one thousandth of a microsecond.
45	jsr166	1.43	*/
46	dl	1.34	NANOSECONDS {
47	dl	1.27	public long toNanos(long d) { return d; }
48			public long toMicros(long d) { return d/(C1/C0); }
49			public long toMillis(long d) { return d/(C2/C0); }
50			public long toSeconds(long d) { return d/(C3/C0); }
51			public long toMinutes(long d) { return d/(C4/C0); }
52			public long toHours(long d) { return d/(C5/C0); }
53			public long toDays(long d) { return d/(C6/C0); }
54			public long convert(long d, TimeUnit u) { return u.toNanos(d); }
55			int excessNanos(long d, long m) { return (int)(d - (m*C2)); }
56			},
57	jsr166	1.43
58			/**
59	jsr166	1.47	* Time unit representing one thousandth of a millisecond.
60	jsr166	1.43	*/
61	dl	1.34	MICROSECONDS {
62	dl	1.27	public long toNanos(long d) { return x(d, C1/C0, MAX/(C1/C0)); }
63			public long toMicros(long d) { return d; }
64			public long toMillis(long d) { return d/(C2/C1); }
65			public long toSeconds(long d) { return d/(C3/C1); }
66			public long toMinutes(long d) { return d/(C4/C1); }
67			public long toHours(long d) { return d/(C5/C1); }
68			public long toDays(long d) { return d/(C6/C1); }
69			public long convert(long d, TimeUnit u) { return u.toMicros(d); }
70			int excessNanos(long d, long m) { return (int)((dC1) - (mC2)); }
71			},
72	jsr166	1.43
73			/**
74	jsr166	1.47	* Time unit representing one thousandth of a second.
75	jsr166	1.43	*/
76	dl	1.34	MILLISECONDS {
77	dl	1.27	public long toNanos(long d) { return x(d, C2/C0, MAX/(C2/C0)); }
78			public long toMicros(long d) { return x(d, C2/C1, MAX/(C2/C1)); }
79			public long toMillis(long d) { return d; }
80			public long toSeconds(long d) { return d/(C3/C2); }
81			public long toMinutes(long d) { return d/(C4/C2); }
82			public long toHours(long d) { return d/(C5/C2); }
83			public long toDays(long d) { return d/(C6/C2); }
84			public long convert(long d, TimeUnit u) { return u.toMillis(d); }
85			int excessNanos(long d, long m) { return 0; }
86			},
87	jsr166	1.43
88			/**
89	jsr166	1.47	* Time unit representing one second.
90	jsr166	1.43	*/
91	dl	1.34	SECONDS {
92	dl	1.27	public long toNanos(long d) { return x(d, C3/C0, MAX/(C3/C0)); }
93			public long toMicros(long d) { return x(d, C3/C1, MAX/(C3/C1)); }
94			public long toMillis(long d) { return x(d, C3/C2, MAX/(C3/C2)); }
95			public long toSeconds(long d) { return d; }
96			public long toMinutes(long d) { return d/(C4/C3); }
97			public long toHours(long d) { return d/(C5/C3); }
98			public long toDays(long d) { return d/(C6/C3); }
99			public long convert(long d, TimeUnit u) { return u.toSeconds(d); }
100			int excessNanos(long d, long m) { return 0; }
101			},
102	jsr166	1.43
103			/**
104	jsr166	1.47	* Time unit representing sixty seconds.
105	jsr166	1.44	* @since 1.6
106	jsr166	1.43	*/
107	dl	1.34	MINUTES {
108	dl	1.27	public long toNanos(long d) { return x(d, C4/C0, MAX/(C4/C0)); }
109			public long toMicros(long d) { return x(d, C4/C1, MAX/(C4/C1)); }
110			public long toMillis(long d) { return x(d, C4/C2, MAX/(C4/C2)); }
111			public long toSeconds(long d) { return x(d, C4/C3, MAX/(C4/C3)); }
112			public long toMinutes(long d) { return d; }
113			public long toHours(long d) { return d/(C5/C4); }
114			public long toDays(long d) { return d/(C6/C4); }
115			public long convert(long d, TimeUnit u) { return u.toMinutes(d); }
116			int excessNanos(long d, long m) { return 0; }
117			},
118	jsr166	1.43
119			/**
120	jsr166	1.47	* Time unit representing sixty minutes.
121	jsr166	1.44	* @since 1.6
122	jsr166	1.43	*/
123	dl	1.34	HOURS {
124	dl	1.27	public long toNanos(long d) { return x(d, C5/C0, MAX/(C5/C0)); }
125			public long toMicros(long d) { return x(d, C5/C1, MAX/(C5/C1)); }
126			public long toMillis(long d) { return x(d, C5/C2, MAX/(C5/C2)); }
127			public long toSeconds(long d) { return x(d, C5/C3, MAX/(C5/C3)); }
128			public long toMinutes(long d) { return x(d, C5/C4, MAX/(C5/C4)); }
129			public long toHours(long d) { return d; }
130			public long toDays(long d) { return d/(C6/C5); }
131			public long convert(long d, TimeUnit u) { return u.toHours(d); }
132			int excessNanos(long d, long m) { return 0; }
133			},
134	jsr166	1.43
135			/**
136	jsr166	1.47	* Time unit representing twenty four hours.
137	jsr166	1.44	* @since 1.6
138	jsr166	1.43	*/
139	dl	1.34	DAYS {
140	dl	1.27	public long toNanos(long d) { return x(d, C6/C0, MAX/(C6/C0)); }
141			public long toMicros(long d) { return x(d, C6/C1, MAX/(C6/C1)); }
142			public long toMillis(long d) { return x(d, C6/C2, MAX/(C6/C2)); }
143			public long toSeconds(long d) { return x(d, C6/C3, MAX/(C6/C3)); }
144			public long toMinutes(long d) { return x(d, C6/C4, MAX/(C6/C4)); }
145			public long toHours(long d) { return x(d, C6/C5, MAX/(C6/C5)); }
146			public long toDays(long d) { return d; }
147			public long convert(long d, TimeUnit u) { return u.toDays(d); }
148			int excessNanos(long d, long m) { return 0; }
149			};
150	jsr166	1.29
151	dl	1.27	// Handy constants for conversion methods
152			static final long C0 = 1L;
153			static final long C1 = C0 * 1000L;
154			static final long C2 = C1 * 1000L;
155			static final long C3 = C2 * 1000L;
156			static final long C4 = C3 * 60L;
157			static final long C5 = C4 * 60L;
158			static final long C6 = C5 * 24L;
159	jsr166	1.29
160	dl	1.27	static final long MAX = Long.MAX_VALUE;
161	jsr166	1.29
162	dl	1.27	/**
163			* Scale d by m, checking for overflow.
164			* This has a short name to make above code more readable.
165			*/
166			static long x(long d, long m, long over) {
167	jsr166	1.46	if (d > +over) return Long.MAX_VALUE;
168	dl	1.27	if (d < -over) return Long.MIN_VALUE;
169			return d * m;
170			}
171	jsr166	1.29
172	jsr166	1.33	// To maintain full signature compatibility with 1.5, and to improve the
173			// clarity of the generated javadoc (see 6287639: Abstract methods in
174			// enum classes should not be listed as abstract), method convert
175			// etc. are not declared abstract but otherwise act as abstract methods.
176	dl	1.32
177	dl	1.27	/**
178	jsr166	1.42	* Converts the given time duration in the given unit to this unit.
179			* Conversions from finer to coarser granularities truncate, so
180			* lose precision. For example, converting {@code 999} milliseconds
181			* to seconds results in {@code 0}. Conversions from coarser to
182			* finer granularities with arguments that would numerically
183			* overflow saturate to {@code Long.MIN_VALUE} if negative or
184			* {@code Long.MAX_VALUE} if positive.
185	jsr166	1.33	*
186			* <p>For example, to convert 10 minutes to milliseconds, use:
187	jsr166	1.40	* {@code TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)}
188	dl	1.27	*
189	jsr166	1.40	* @param sourceDuration the time duration in the given {@code sourceUnit}
190			* @param sourceUnit the unit of the {@code sourceDuration} argument
191	dl	1.27	* @return the converted duration in this unit,
192	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
193			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
194	dl	1.27	*/
195	dl	1.32	public long convert(long sourceDuration, TimeUnit sourceUnit) {
196			throw new AbstractMethodError();
197			}
198	jsr166	1.29
199	dl	1.27	/**
200	jsr166	1.41	* Equivalent to
201			* {@link #convert(long, TimeUnit) NANOSECONDS.convert(duration, this)}.
202	dl	1.27	* @param duration the duration
203			* @return the converted duration,
204	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
205			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
206	dl	1.27	*/
207	dl	1.32	public long toNanos(long duration) {
208			throw new AbstractMethodError();
209			}
210	jsr166	1.29
211	dl	1.27	/**
212	jsr166	1.41	* Equivalent to
213			* {@link #convert(long, TimeUnit) MICROSECONDS.convert(duration, this)}.
214	dl	1.27	* @param duration the duration
215			* @return the converted duration,
216	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
217			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
218	dl	1.27	*/
219	dl	1.32	public long toMicros(long duration) {
220			throw new AbstractMethodError();
221			}
222	jsr166	1.29
223	dl	1.27	/**
224	jsr166	1.41	* Equivalent to
225			* {@link #convert(long, TimeUnit) MILLISECONDS.convert(duration, this)}.
226	dl	1.27	* @param duration the duration
227			* @return the converted duration,
228	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
229			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
230	dl	1.27	*/
231	dl	1.32	public long toMillis(long duration) {
232			throw new AbstractMethodError();
233			}
234	jsr166	1.29
235	dl	1.27	/**
236	jsr166	1.41	* Equivalent to
237			* {@link #convert(long, TimeUnit) SECONDS.convert(duration, this)}.
238	dl	1.27	* @param duration the duration
239			* @return the converted duration,
240	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
241			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
242	dl	1.27	*/
243	dl	1.32	public long toSeconds(long duration) {
244			throw new AbstractMethodError();
245			}
246	jsr166	1.29
247	dl	1.27	/**
248	jsr166	1.41	* Equivalent to
249			* {@link #convert(long, TimeUnit) MINUTES.convert(duration, this)}.
250	dl	1.27	* @param duration the duration
251			* @return the converted duration,
252	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
253			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
254	dl	1.31	* @since 1.6
255	dl	1.27	*/
256	dl	1.32	public long toMinutes(long duration) {
257			throw new AbstractMethodError();
258			}
259	jsr166	1.29
260	dl	1.27	/**
261	jsr166	1.41	* Equivalent to
262			* {@link #convert(long, TimeUnit) HOURS.convert(duration, this)}.
263	dl	1.27	* @param duration the duration
264			* @return the converted duration,
265	jsr166	1.40	* or {@code Long.MIN_VALUE} if conversion would negatively
266			* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
267	dl	1.31	* @since 1.6
268	dl	1.27	*/
269	dl	1.32	public long toHours(long duration) {
270			throw new AbstractMethodError();
271			}
272	jsr166	1.29
273	dl	1.27	/**
274	jsr166	1.41	* Equivalent to
275			* {@link #convert(long, TimeUnit) DAYS.convert(duration, this)}.
276	dl	1.27	* @param duration the duration
277			* @return the converted duration
278	dl	1.31	* @since 1.6
279	dl	1.27	*/
280	dl	1.32	public long toDays(long duration) {
281			throw new AbstractMethodError();
282			}
283	jsr166	1.29
284	dl	1.27	/**
285			* Utility to compute the excess-nanosecond argument to wait,
286			* sleep, join.
287			* @param d the duration
288			* @param m the number of milliseconds
289			* @return the number of nanoseconds
290			*/
291			abstract int excessNanos(long d, long m);
292	jsr166	1.29
293	dl	1.27	/**
294	jsr166	1.37	* Performs a timed {@link Object#wait(long, int) Object.wait}
295			* using this time unit.
296	dl	1.27	* This is a convenience method that converts timeout arguments
297	jsr166	1.40	* into the form required by the {@code Object.wait} method.
298	dl	1.27	*
299	jsr166	1.40	* <p>For example, you could implement a blocking {@code poll}
300	dl	1.27	* method (see {@link BlockingQueue#poll BlockingQueue.poll})
301			* using:
302			*
303	jsr166	1.45	* <pre> {@code
304	jsr166	1.36	* public synchronized Object poll(long timeout, TimeUnit unit)
305			* throws InterruptedException {
306			* while (empty) {
307			* unit.timedWait(this, timeout);
308			* ...
309			* }
310			* }}</pre>
311	dl	1.27	*
312			* @param obj the object to wait on
313	dl	1.28	* @param timeout the maximum time to wait. If less than
314			* or equal to zero, do not wait at all.
315	jsr166	1.37	* @throws InterruptedException if interrupted while waiting
316	dl	1.27	*/
317			public void timedWait(Object obj, long timeout)
318	jsr166	1.37	throws InterruptedException {
319	dl	1.27	if (timeout > 0) {
320			long ms = toMillis(timeout);
321			int ns = excessNanos(timeout, ms);
322			obj.wait(ms, ns);
323			}
324			}
325	jsr166	1.29
326	dl	1.27	/**
327	jsr166	1.37	* Performs a timed {@link Thread#join(long, int) Thread.join}
328			* using this time unit.
329	dl	1.27	* This is a convenience method that converts time arguments into the
330	jsr166	1.40	* form required by the {@code Thread.join} method.
331	jsr166	1.37	*
332	dl	1.27	* @param thread the thread to wait for
333	dl	1.28	* @param timeout the maximum time to wait. If less than
334			* or equal to zero, do not wait at all.
335	jsr166	1.37	* @throws InterruptedException if interrupted while waiting
336	dl	1.27	*/
337			public void timedJoin(Thread thread, long timeout)
338	jsr166	1.37	throws InterruptedException {
339	dl	1.27	if (timeout > 0) {
340			long ms = toMillis(timeout);
341			int ns = excessNanos(timeout, ms);
342			thread.join(ms, ns);
343			}
344			}
345	jsr166	1.29
346	dl	1.27	/**
347	jsr166	1.37	* Performs a {@link Thread#sleep(long, int) Thread.sleep} using
348			* this time unit.
349	dl	1.27	* This is a convenience method that converts time arguments into the
350	jsr166	1.40	* form required by the {@code Thread.sleep} method.
351	jsr166	1.37	*
352	dl	1.28	* @param timeout the minimum time to sleep. If less than
353			* or equal to zero, do not sleep at all.
354	jsr166	1.37	* @throws InterruptedException if interrupted while sleeping
355	dl	1.27	*/
356			public void sleep(long timeout) throws InterruptedException {
357			if (timeout > 0) {
358			long ms = toMillis(timeout);
359			int ns = excessNanos(timeout, ms);
360			Thread.sleep(ms, ns);
361			}
362			}
363	jsr166	1.29
364	tim	1.1	}