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Comparing jsr166/src/main/java/util/concurrent/TimeUnit.java (file contents):
Revision 1.26 by dl, Mon Mar 7 16:41:56 2005 UTC vs.
Revision 1.27 by dl, Tue Mar 8 12:27:11 2005 UTC

#	Line 7 | Line 7
7		package java.util.concurrent;
8
9		/**
10	<	* A <tt>TimeUnit</tt> represents time durations at a given unit of
11	<	* granularity and provides utility methods to convert across units,
12	<	* and to perform timing and delay operations in these units.  A
13	<	* <tt>TimeUnit</tt> does not maintain time information, but only
14	<	* 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	<	* <p>A <tt>TimeUnit</tt> is mainly used to inform time-based methods
22	<	* 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	<	* <pre>  Lock lock = ...;
27	<	*  if ( lock.tryLock(50L, TimeUnit.MILLISECONDS) ) ...
28	<	* </pre>
29	<	* while this code will timeout in 50 seconds:
30	<	* <pre>
31	<	*  Lock lock = ...;
32	<	*  if ( lock.tryLock(50L, TimeUnit.SECONDS) ) ...
33	<	* </pre>
34	<	*
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	<	* same granularity as the given <tt>TimeUnit</tt>.
38	<	*
39	<	* @since 1.5
40	<	* @author Doug Lea
41	<	*/
10	>	* A <tt>TimeUnit</tt> represents time durations at a given unit of
11	>	* granularity and provides utility methods to convert across units,
12	>	* and to perform timing and delay operations in these units.  A
13	>	* <tt>TimeUnit</tt> does not maintain time information, but only
14	>	* 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	>	* <p>A <tt>TimeUnit</tt> is mainly used to inform time-based methods
22	>	* 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	>	* <pre>  Lock lock = ...;
27	>	*  if ( lock.tryLock(50L, TimeUnit.MILLISECONDS) ) ...
28	>	* </pre>
29	>	* while this code will timeout in 50 seconds:
30	>	* <pre>
31	>	*  Lock lock = ...;
32	>	*  if ( lock.tryLock(50L, TimeUnit.SECONDS) ) ...
33	>	* </pre>
34	>	*
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	>	* same granularity as the given <tt>TimeUnit</tt>.
38	>	*
39	>	* @since 1.5
40	>	* @author Doug Lea
41	>	*/
42		public enum TimeUnit {
43	<	NANOSECONDS (0) {
44	<	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	<	MICROSECONDS (1) {
55	<	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)((d*C1) - (m*C2)); }
64	<	},
65	<	MILLISECONDS (2) {
66	<	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	<	SECONDS (3) {
77	<	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	<	MINUTES (4) {
88	<	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	<	HOURS (5) {
99	<	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	<	DAYS (6) {
110	<	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	<
121	<	/**
122	<	* The index of this unit. This value is no longer used in this
123	<	* version of this class, but is retained for serialization
124	<	* compatibility with previous version.
125	<	*/
126	<	private final int index;
127	<
128	<	/** Internal constructor */
129	<	TimeUnit(int index) {
130	<	this.index = index;
131	<	}
132	<
133	<	// Handy constants for conversion methods
134	<	static final long C0 = 1L;
135	<	static final long C1 = C0 * 1000L;
136	<	static final long C2 = C1 * 1000L;
137	<	static final long C3 = C2 * 1000L;
138	<	static final long C4 = C3 * 60L;
139	<	static final long C5 = C4 * 60L;
140	<	static final long C6 = C5 * 24L;
141	<
142	<	static final long MAX = Long.MAX_VALUE;
143	<
144	<	/**
145	<	* Scale d by m, checking for overflow.
146	<	* This has a short name to make above code more readable.
147	<	*/
148	<	static long x(long d, long m, long over) {
149	<	if (d >  over) return Long.MAX_VALUE;
150	<	if (d < -over) return Long.MIN_VALUE;
151	<	return d * m;
152	<	}
153	<
154	<	/**
155	<	* Convert the given time duration in the given unit to this
156	<	* unit.  Conversions from finer to coarser granularities
157	<	* truncate, so lose precision. For example converting
158	<	* <tt>999</tt> milliseconds to seconds results in
159	<	* <tt>0</tt>. Conversions from coarser to finer granularities
160	<	* with arguments that would numerically overflow saturate to
161	<	* <tt>Long.MIN_VALUE</tt> if negative or <tt>Long.MAX_VALUE</tt>
162	<	* if positive.
163	<	*
164	<	* @param duration the time duration in the given <tt>unit</tt>
165	<	* @param unit the unit of the <tt>duration</tt> argument
166	<	* @return the converted duration in this unit,
167	<	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
168	<	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
169	<	*/
170	<	public abstract long convert(long duration, TimeUnit unit);
171	<
172	<	/**
173	<	* Equivalent to <tt>NANOSECONDS.convert(duration, this)</tt>.
174	<	* @param duration the duration
175	<	* @return the converted duration,
176	<	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
177	<	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
178	<	* @see #convert
179	<	*/
180	<	public abstract long toNanos(long duration);
181	<
182	<	/**
183	<	* Equivalent to <tt>MICROSECONDS.convert(duration, this)</tt>.
184	<	* @param duration the duration
185	<	* @return the converted duration,
186	<	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
187	<	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
188	<	* @see #convert
189	<	*/
190	<	public abstract long toMicros(long duration);
191	<
192	<	/**
193	<	* Equivalent to <tt>MILLISECONDS.convert(duration, this)</tt>.
194	<	* @param duration the duration
195	<	* @return the converted duration,
196	<	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
197	<	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
198	<	* @see #convert
199	<	*/
200	<	public abstract long toMillis(long duration);
201	<
202	<	/**
203	<	* Equivalent to <tt>SECONDS.convert(duration, this)</tt>.
204	<	* @param duration the duration
205	<	* @return the converted duration,
206	<	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
207	<	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
208	<	* @see #convert
209	<	*/
210	<	public abstract long toSeconds(long duration);
211	<
212	<	/**
213	<	* Equivalent to <tt>MINUTES.convert(duration, this)</tt>.
214	<	* @param duration the duration
215	<	* @return the converted duration,
216	<	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
217	<	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
218	<	* @see #convert
219	<	*/
220	<	public abstract long toMinutes(long duration);
221	<
222	<	/**
223	<	* Equivalent to <tt>HOURS.convert(duration, this)</tt>.
224	<	* @param duration the duration
225	<	* @return the converted duration,
226	<	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
227	<	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
228	<	* @see #convert
229	<	*/
230	<	public abstract long toHours(long duration);
231	<
232	<	/**
233	<	* Equivalent to <tt>DAYS.convert(duration, this)</tt>.
234	<	* @param duration the duration
235	<	* @return the converted duration
236	<	* @see #convert
237	<	*/
238	<	public abstract long toDays(long duration);
239	<
240	<	/**
241	<	* Utility to compute the excess-nanosecond argument to wait,
242	<	* sleep, join.
243	<	* @param d the duration
244	<	* @param m the number of milliseconds
245	<	* @return the number of nanoseconds
246	<	*/
247	<	abstract int excessNanos(long d, long m);
248	<
249	<	/**
250	<	* Perform a timed <tt>Object.wait</tt> using this time unit.
251	<	* This is a convenience method that converts timeout arguments
252	<	* into the form required by the <tt>Object.wait</tt> method.
253	<	*
254	<	* <p>For example, you could implement a blocking <tt>poll</tt>
255	<	* method (see {@link BlockingQueue#poll BlockingQueue.poll})
256	<	* using:
257	<	*
258	<	* <pre>  public synchronized  Object poll(long timeout, TimeUnit unit) throws InterruptedException {
259	<	*    while (empty) {
260	<	*      unit.timedWait(this, timeout);
261	<	*      ...
262	<	*    }
263	<	*  }</pre>
264	<	*
265	<	* @param obj the object to wait on
266	<	* @param timeout the maximum time to wait.
267	<	* @throws InterruptedException if interrupted while waiting.
268	<	* @see Object#wait(long, int)
269	<	*/
270	<	public void timedWait(Object obj, long timeout)
271	<	throws InterruptedException {
272	<	if (timeout > 0) {
273	<	long ms = toMillis(timeout);
274	<	int ns = excessNanos(timeout, ms);
275	<	obj.wait(ms, ns);
276	<	}
277	<	}
278	<
279	<	/**
280	<	* Perform a timed <tt>Thread.join</tt> using this time unit.
281	<	* This is a convenience method that converts time arguments into the
282	<	* form required by the <tt>Thread.join</tt> method.
283	<	* @param thread the thread to wait for
284	<	* @param timeout the maximum time to wait
285	<	* @throws InterruptedException if interrupted while waiting.
286	<	* @see Thread#join(long, int)
287	<	*/
288	<	public void timedJoin(Thread thread, long timeout)
289	<	throws InterruptedException {
290	<	if (timeout > 0) {
291	<	long ms = toMillis(timeout);
292	<	int ns = excessNanos(timeout, ms);
293	<	thread.join(ms, ns);
294	<	}
295	<	}
296	<
297	<	/**
298	<	* Perform a <tt>Thread.sleep</tt> using this unit.
299	<	* This is a convenience method that converts time arguments into the
300	<	* form required by the <tt>Thread.sleep</tt> method.
301	<	* @param timeout the minimum time to sleep
302	<	* @throws InterruptedException if interrupted while sleeping.
303	<	* @see Thread#sleep
304	<	*/
305	<	public void sleep(long timeout) throws InterruptedException {
306	<	if (timeout > 0) {
307	<	long ms = toMillis(timeout);
308	<	int ns = excessNanos(timeout, ms);
309	<	Thread.sleep(ms, ns);
310	<	}
311	<	}
312	<
43	>	NANOSECONDS (0) {
44	>	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	>	MICROSECONDS (1) {
55	>	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)((d*C1) - (m*C2)); }
64	>	},
65	>	MILLISECONDS (2) {
66	>	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	>	SECONDS (3) {
77	>	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	>	MINUTES (4) {
88	>	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	>	HOURS (5) {
99	>	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	>	DAYS (6) {
110	>	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	>
121	>	/**
122	>	* The index of this unit. This value is no longer used in this
123	>	* version of this class, but is retained for serialization
124	>	* compatibility with previous version.
125	>	*/
126	>	private final int index;
127	>
128	>	/** Internal constructor */
129	>	TimeUnit(int index) {
130	>	this.index = index;
131	>	}
132	>
133	>	// Handy constants for conversion methods
134	>	static final long C0 = 1L;
135	>	static final long C1 = C0 * 1000L;
136	>	static final long C2 = C1 * 1000L;
137	>	static final long C3 = C2 * 1000L;
138	>	static final long C4 = C3 * 60L;
139	>	static final long C5 = C4 * 60L;
140	>	static final long C6 = C5 * 24L;
141	>
142	>	static final long MAX = Long.MAX_VALUE;
143	>
144	>	/**
145	>	* Scale d by m, checking for overflow.
146	>	* This has a short name to make above code more readable.
147	>	*/
148	>	static long x(long d, long m, long over) {
149	>	if (d >  over) return Long.MAX_VALUE;
150	>	if (d < -over) return Long.MIN_VALUE;
151	>	return d * m;
152	>	}
153	>
154	>	/**
155	>	* Convert the given time duration in the given unit to this
156	>	* unit.  Conversions from finer to coarser granularities
157	>	* truncate, so lose precision. For example converting
158	>	* <tt>999</tt> milliseconds to seconds results in
159	>	* <tt>0</tt>. Conversions from coarser to finer granularities
160	>	* with arguments that would numerically overflow saturate to
161	>	* <tt>Long.MIN_VALUE</tt> if negative or <tt>Long.MAX_VALUE</tt>
162	>	* if positive.
163	>	*
164	>	* @param duration the time duration in the given <tt>unit</tt>
165	>	* @param unit the unit of the <tt>duration</tt> argument
166	>	* @return the converted duration in this unit,
167	>	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
168	>	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
169	>	*/
170	>	public abstract long convert(long duration, TimeUnit unit);
171	>
172	>	/**
173	>	* Equivalent to <tt>NANOSECONDS.convert(duration, this)</tt>.
174	>	* @param duration the duration
175	>	* @return the converted duration,
176	>	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
177	>	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
178	>	* @see #convert
179	>	*/
180	>	public abstract long toNanos(long duration);
181	>
182	>	/**
183	>	* Equivalent to <tt>MICROSECONDS.convert(duration, this)</tt>.
184	>	* @param duration the duration
185	>	* @return the converted duration,
186	>	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
187	>	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
188	>	* @see #convert
189	>	*/
190	>	public abstract long toMicros(long duration);
191	>
192	>	/**
193	>	* Equivalent to <tt>MILLISECONDS.convert(duration, this)</tt>.
194	>	* @param duration the duration
195	>	* @return the converted duration,
196	>	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
197	>	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
198	>	* @see #convert
199	>	*/
200	>	public abstract long toMillis(long duration);
201	>
202	>	/**
203	>	* Equivalent to <tt>SECONDS.convert(duration, this)</tt>.
204	>	* @param duration the duration
205	>	* @return the converted duration,
206	>	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
207	>	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
208	>	* @see #convert
209	>	*/
210	>	public abstract long toSeconds(long duration);
211	>
212	>	/**
213	>	* Equivalent to <tt>MINUTES.convert(duration, this)</tt>.
214	>	* @param duration the duration
215	>	* @return the converted duration,
216	>	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
217	>	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
218	>	* @see #convert
219	>	*/
220	>	public abstract long toMinutes(long duration);
221	>
222	>	/**
223	>	* Equivalent to <tt>HOURS.convert(duration, this)</tt>.
224	>	* @param duration the duration
225	>	* @return the converted duration,
226	>	* or <tt>Long.MIN_VALUE</tt> if conversion would negatively
227	>	* overflow, or <tt>Long.MAX_VALUE</tt> if it would positively overflow.
228	>	* @see #convert
229	>	*/
230	>	public abstract long toHours(long duration);
231	>
232	>	/**
233	>	* Equivalent to <tt>DAYS.convert(duration, this)</tt>.
234	>	* @param duration the duration
235	>	* @return the converted duration
236	>	* @see #convert
237	>	*/
238	>	public abstract long toDays(long duration);
239	>
240	>	/**
241	>	* Utility to compute the excess-nanosecond argument to wait,
242	>	* sleep, join.
243	>	* @param d the duration
244	>	* @param m the number of milliseconds
245	>	* @return the number of nanoseconds
246	>	*/
247	>	abstract int excessNanos(long d, long m);
248	>
249	>	/**
250	>	* Perform a timed <tt>Object.wait</tt> using this time unit.
251	>	* This is a convenience method that converts timeout arguments
252	>	* into the form required by the <tt>Object.wait</tt> method.
253	>	*
254	>	* <p>For example, you could implement a blocking <tt>poll</tt>
255	>	* method (see {@link BlockingQueue#poll BlockingQueue.poll})
256	>	* using:
257	>	*
258	>	* <pre>  public synchronized  Object poll(long timeout, TimeUnit unit) throws InterruptedException {
259	>	*    while (empty) {
260	>	*      unit.timedWait(this, timeout);
261	>	*      ...
262	>	*    }
263	>	*  }</pre>
264	>	*
265	>	* @param obj the object to wait on
266	>	* @param timeout the maximum time to wait.
267	>	* @throws InterruptedException if interrupted while waiting.
268	>	* @see Object#wait(long, int)
269	>	*/
270	>	public void timedWait(Object obj, long timeout)
271	>	throws InterruptedException {
272	>	if (timeout > 0) {
273	>	long ms = toMillis(timeout);
274	>	int ns = excessNanos(timeout, ms);
275	>	obj.wait(ms, ns);
276	>	}
277	>	}
278	>
279	>	/**
280	>	* Perform a timed <tt>Thread.join</tt> using this time unit.
281	>	* This is a convenience method that converts time arguments into the
282	>	* form required by the <tt>Thread.join</tt> method.
283	>	* @param thread the thread to wait for
284	>	* @param timeout the maximum time to wait
285	>	* @throws InterruptedException if interrupted while waiting.
286	>	* @see Thread#join(long, int)
287	>	*/
288	>	public void timedJoin(Thread thread, long timeout)
289	>	throws InterruptedException {
290	>	if (timeout > 0) {
291	>	long ms = toMillis(timeout);
292	>	int ns = excessNanos(timeout, ms);
293	>	thread.join(ms, ns);
294	>	}
295	>	}
296	>
297	>	/**
298	>	* Perform a <tt>Thread.sleep</tt> using this unit.
299	>	* This is a convenience method that converts time arguments into the
300	>	* form required by the <tt>Thread.sleep</tt> method.
301	>	* @param timeout the minimum time to sleep
302	>	* @throws InterruptedException if interrupted while sleeping.
303	>	* @see Thread#sleep
304	>	*/
305	>	public void sleep(long timeout) throws InterruptedException {
306	>	if (timeout > 0) {
307	>	long ms = toMillis(timeout);
308	>	int ns = excessNanos(timeout, ms);
309	>	Thread.sleep(ms, ns);
310	>	}
311	>	}
312	>
313		}

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