1 |
dl |
1.2 |
/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
dl |
1.23 |
* Expert Group and released to the public domain, as explained at |
4 |
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* http://creativecommons.org/licenses/publicdomain |
5 |
dl |
1.2 |
*/ |
6 |
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7 |
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8 |
tim |
1.1 |
package java.util.concurrent; |
9 |
jsr166 |
1.37 |
import java.util.concurrent.*; // for javadoc (till 6280605 is fixed) |
10 |
dl |
1.5 |
import java.util.concurrent.locks.*; |
11 |
tim |
1.1 |
import java.util.*; |
12 |
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13 |
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/** |
14 |
dl |
1.27 |
* An unbounded {@linkplain BlockingQueue blocking queue} of |
15 |
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* <tt>Delayed</tt> elements, in which an element can only be taken |
16 |
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* when its delay has expired. The <em>head</em> of the queue is that |
17 |
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* <tt>Delayed</tt> element whose delay expired furthest in the |
18 |
jsr166 |
1.32 |
* past. If no delay has expired there is no head and <tt>poll</tt> |
19 |
dl |
1.27 |
* will return <tt>null</tt>. Expiration occurs when an element's |
20 |
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* <tt>getDelay(TimeUnit.NANOSECONDS)</tt> method returns a value less |
21 |
dl |
1.36 |
* than or equal to zero. Even though unexpired elements cannot be |
22 |
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* removed using <tt>take</tt> or <tt>poll</tt>, they are otherwise |
23 |
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* treated as normal elements. For example, the <tt>size</tt> method |
24 |
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* returns the count of both expired and unexpired elements. |
25 |
jsr166 |
1.39 |
* This queue does not permit null elements. |
26 |
dl |
1.25 |
* |
27 |
dl |
1.26 |
* <p>This class and its iterator implement all of the |
28 |
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* <em>optional</em> methods of the {@link Collection} and {@link |
29 |
jsr166 |
1.29 |
* Iterator} interfaces. |
30 |
dl |
1.26 |
* |
31 |
dl |
1.25 |
* <p>This class is a member of the |
32 |
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* <a href="{@docRoot}/../guide/collections/index.html"> |
33 |
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* Java Collections Framework</a>. |
34 |
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* |
35 |
dl |
1.4 |
* @since 1.5 |
36 |
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* @author Doug Lea |
37 |
dl |
1.20 |
* @param <E> the type of elements held in this collection |
38 |
dl |
1.19 |
*/ |
39 |
tim |
1.1 |
|
40 |
dl |
1.3 |
public class DelayQueue<E extends Delayed> extends AbstractQueue<E> |
41 |
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implements BlockingQueue<E> { |
42 |
tim |
1.6 |
|
43 |
dl |
1.2 |
private transient final ReentrantLock lock = new ReentrantLock(); |
44 |
dl |
1.22 |
private transient final Condition available = lock.newCondition(); |
45 |
dl |
1.3 |
private final PriorityQueue<E> q = new PriorityQueue<E>(); |
46 |
tim |
1.1 |
|
47 |
dl |
1.4 |
/** |
48 |
dholmes |
1.7 |
* Creates a new <tt>DelayQueue</tt> that is initially empty. |
49 |
dl |
1.4 |
*/ |
50 |
tim |
1.1 |
public DelayQueue() {} |
51 |
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|
52 |
tim |
1.6 |
/** |
53 |
tim |
1.9 |
* Creates a <tt>DelayQueue</tt> initially containing the elements of the |
54 |
dholmes |
1.7 |
* given collection of {@link Delayed} instances. |
55 |
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* |
56 |
jsr166 |
1.32 |
* @param c the collection of elements to initially contain |
57 |
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* @throws NullPointerException if the specified collection or any |
58 |
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* of its elements are null |
59 |
tim |
1.6 |
*/ |
60 |
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public DelayQueue(Collection<? extends E> c) { |
61 |
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this.addAll(c); |
62 |
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} |
63 |
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64 |
dholmes |
1.7 |
/** |
65 |
dl |
1.16 |
* Inserts the specified element into this delay queue. |
66 |
dholmes |
1.7 |
* |
67 |
jsr166 |
1.30 |
* @param e the element to add |
68 |
jsr166 |
1.38 |
* @return <tt>true</tt> (as specified by {@link Collection#add}) |
69 |
jsr166 |
1.32 |
* @throws NullPointerException if the specified element is null |
70 |
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*/ |
71 |
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public boolean add(E e) { |
72 |
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return offer(e); |
73 |
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} |
74 |
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75 |
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/** |
76 |
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* Inserts the specified element into this delay queue. |
77 |
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* |
78 |
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* @param e the element to add |
79 |
dholmes |
1.7 |
* @return <tt>true</tt> |
80 |
jsr166 |
1.32 |
* @throws NullPointerException if the specified element is null |
81 |
dholmes |
1.7 |
*/ |
82 |
jsr166 |
1.30 |
public boolean offer(E e) { |
83 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
84 |
dl |
1.2 |
lock.lock(); |
85 |
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try { |
86 |
dl |
1.3 |
E first = q.peek(); |
87 |
jsr166 |
1.30 |
q.offer(e); |
88 |
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if (first == null || e.compareTo(first) < 0) |
89 |
dl |
1.4 |
available.signalAll(); |
90 |
dl |
1.2 |
return true; |
91 |
tim |
1.13 |
} finally { |
92 |
dl |
1.2 |
lock.unlock(); |
93 |
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} |
94 |
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} |
95 |
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96 |
dholmes |
1.7 |
/** |
97 |
jsr166 |
1.32 |
* Inserts the specified element into this delay queue. As the queue is |
98 |
dholmes |
1.7 |
* unbounded this method will never block. |
99 |
jsr166 |
1.32 |
* |
100 |
jsr166 |
1.30 |
* @param e the element to add |
101 |
jsr166 |
1.32 |
* @throws NullPointerException {@inheritDoc} |
102 |
dholmes |
1.7 |
*/ |
103 |
jsr166 |
1.30 |
public void put(E e) { |
104 |
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offer(e); |
105 |
dl |
1.2 |
} |
106 |
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|
107 |
dholmes |
1.7 |
/** |
108 |
dl |
1.16 |
* Inserts the specified element into this delay queue. As the queue is |
109 |
dholmes |
1.7 |
* unbounded this method will never block. |
110 |
jsr166 |
1.32 |
* |
111 |
jsr166 |
1.30 |
* @param e the element to add |
112 |
dl |
1.14 |
* @param timeout This parameter is ignored as the method never blocks |
113 |
dholmes |
1.7 |
* @param unit This parameter is ignored as the method never blocks |
114 |
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* @return <tt>true</tt> |
115 |
jsr166 |
1.32 |
* @throws NullPointerException {@inheritDoc} |
116 |
dholmes |
1.7 |
*/ |
117 |
jsr166 |
1.30 |
public boolean offer(E e, long timeout, TimeUnit unit) { |
118 |
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return offer(e); |
119 |
dl |
1.2 |
} |
120 |
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|
121 |
dholmes |
1.7 |
/** |
122 |
jsr166 |
1.32 |
* Retrieves and removes the head of this queue, or returns <tt>null</tt> |
123 |
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* if this queue has no elements with an expired delay. |
124 |
dholmes |
1.7 |
* |
125 |
jsr166 |
1.32 |
* @return the head of this queue, or <tt>null</tt> if this |
126 |
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* queue has no elements with an expired delay |
127 |
dholmes |
1.7 |
*/ |
128 |
jsr166 |
1.32 |
public E poll() { |
129 |
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final ReentrantLock lock = this.lock; |
130 |
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lock.lock(); |
131 |
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try { |
132 |
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E first = q.peek(); |
133 |
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if (first == null || first.getDelay(TimeUnit.NANOSECONDS) > 0) |
134 |
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return null; |
135 |
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else { |
136 |
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E x = q.poll(); |
137 |
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assert x != null; |
138 |
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if (q.size() != 0) |
139 |
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available.signalAll(); |
140 |
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return x; |
141 |
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} |
142 |
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} finally { |
143 |
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lock.unlock(); |
144 |
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} |
145 |
dl |
1.2 |
} |
146 |
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147 |
dl |
1.27 |
/** |
148 |
jsr166 |
1.32 |
* Retrieves and removes the head of this queue, waiting if necessary |
149 |
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* until an element with an expired delay is available on this queue. |
150 |
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* |
151 |
dl |
1.27 |
* @return the head of this queue |
152 |
jsr166 |
1.32 |
* @throws InterruptedException {@inheritDoc} |
153 |
dl |
1.27 |
*/ |
154 |
dl |
1.3 |
public E take() throws InterruptedException { |
155 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
156 |
dl |
1.2 |
lock.lockInterruptibly(); |
157 |
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try { |
158 |
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for (;;) { |
159 |
dl |
1.3 |
E first = q.peek(); |
160 |
dl |
1.12 |
if (first == null) { |
161 |
dl |
1.4 |
available.await(); |
162 |
tim |
1.13 |
} else { |
163 |
dl |
1.2 |
long delay = first.getDelay(TimeUnit.NANOSECONDS); |
164 |
dl |
1.12 |
if (delay > 0) { |
165 |
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long tl = available.awaitNanos(delay); |
166 |
tim |
1.13 |
} else { |
167 |
dl |
1.3 |
E x = q.poll(); |
168 |
dl |
1.2 |
assert x != null; |
169 |
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if (q.size() != 0) |
170 |
dl |
1.4 |
available.signalAll(); // wake up other takers |
171 |
dl |
1.2 |
return x; |
172 |
tim |
1.6 |
|
173 |
dl |
1.2 |
} |
174 |
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} |
175 |
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} |
176 |
tim |
1.13 |
} finally { |
177 |
dl |
1.2 |
lock.unlock(); |
178 |
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} |
179 |
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} |
180 |
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|
181 |
dl |
1.27 |
/** |
182 |
jsr166 |
1.32 |
* Retrieves and removes the head of this queue, waiting if necessary |
183 |
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* until an element with an expired delay is available on this queue, |
184 |
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* or the specified wait time expires. |
185 |
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* |
186 |
dl |
1.27 |
* @return the head of this queue, or <tt>null</tt> if the |
187 |
jsr166 |
1.32 |
* specified waiting time elapses before an element with |
188 |
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* an expired delay becomes available |
189 |
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* @throws InterruptedException {@inheritDoc} |
190 |
dl |
1.27 |
*/ |
191 |
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public E poll(long timeout, TimeUnit unit) throws InterruptedException { |
192 |
jsr166 |
1.41 |
long nanos = unit.toNanos(timeout); |
193 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
194 |
dl |
1.2 |
lock.lockInterruptibly(); |
195 |
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try { |
196 |
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for (;;) { |
197 |
dl |
1.3 |
E first = q.peek(); |
198 |
dl |
1.2 |
if (first == null) { |
199 |
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if (nanos <= 0) |
200 |
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return null; |
201 |
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else |
202 |
dl |
1.4 |
nanos = available.awaitNanos(nanos); |
203 |
tim |
1.13 |
} else { |
204 |
jsr166 |
1.41 |
long delay = first.getDelay(TimeUnit.NANOSECONDS); |
205 |
dl |
1.2 |
if (delay > 0) { |
206 |
dl |
1.40 |
if (nanos <= 0) |
207 |
|
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return null; |
208 |
dl |
1.2 |
if (delay > nanos) |
209 |
|
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delay = nanos; |
210 |
dl |
1.4 |
long timeLeft = available.awaitNanos(delay); |
211 |
dl |
1.2 |
nanos -= delay - timeLeft; |
212 |
tim |
1.13 |
} else { |
213 |
dl |
1.3 |
E x = q.poll(); |
214 |
dl |
1.2 |
assert x != null; |
215 |
|
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if (q.size() != 0) |
216 |
tim |
1.6 |
available.signalAll(); |
217 |
dl |
1.2 |
return x; |
218 |
|
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} |
219 |
|
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} |
220 |
|
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} |
221 |
tim |
1.13 |
} finally { |
222 |
dl |
1.2 |
lock.unlock(); |
223 |
|
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} |
224 |
|
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} |
225 |
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|
226 |
dl |
1.27 |
/** |
227 |
dl |
1.36 |
* Retrieves, but does not remove, the head of this queue, or |
228 |
|
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* returns <tt>null</tt> if this queue is empty. Unlike |
229 |
|
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* <tt>poll</tt>, if no expired elements are available in the queue, |
230 |
|
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* this method returns the element that will expire next, |
231 |
|
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* if one exists. |
232 |
dl |
1.27 |
* |
233 |
jsr166 |
1.32 |
* @return the head of this queue, or <tt>null</tt> if this |
234 |
dl |
1.35 |
* queue is empty. |
235 |
dl |
1.27 |
*/ |
236 |
dl |
1.3 |
public E peek() { |
237 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
238 |
dl |
1.2 |
lock.lock(); |
239 |
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try { |
240 |
|
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return q.peek(); |
241 |
tim |
1.13 |
} finally { |
242 |
dl |
1.2 |
lock.unlock(); |
243 |
|
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} |
244 |
tim |
1.1 |
} |
245 |
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|
246 |
dl |
1.2 |
public int size() { |
247 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
248 |
dl |
1.2 |
lock.lock(); |
249 |
|
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try { |
250 |
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return q.size(); |
251 |
tim |
1.13 |
} finally { |
252 |
dl |
1.2 |
lock.unlock(); |
253 |
|
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} |
254 |
|
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} |
255 |
|
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|
256 |
jsr166 |
1.32 |
/** |
257 |
|
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* @throws UnsupportedOperationException {@inheritDoc} |
258 |
|
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* @throws ClassCastException {@inheritDoc} |
259 |
|
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* @throws NullPointerException {@inheritDoc} |
260 |
|
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* @throws IllegalArgumentException {@inheritDoc} |
261 |
|
|
*/ |
262 |
dl |
1.17 |
public int drainTo(Collection<? super E> c) { |
263 |
|
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if (c == null) |
264 |
|
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throw new NullPointerException(); |
265 |
|
|
if (c == this) |
266 |
|
|
throw new IllegalArgumentException(); |
267 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
268 |
dl |
1.17 |
lock.lock(); |
269 |
|
|
try { |
270 |
|
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int n = 0; |
271 |
|
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for (;;) { |
272 |
|
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E first = q.peek(); |
273 |
|
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if (first == null || first.getDelay(TimeUnit.NANOSECONDS) > 0) |
274 |
|
|
break; |
275 |
|
|
c.add(q.poll()); |
276 |
|
|
++n; |
277 |
|
|
} |
278 |
|
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if (n > 0) |
279 |
|
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available.signalAll(); |
280 |
|
|
return n; |
281 |
|
|
} finally { |
282 |
|
|
lock.unlock(); |
283 |
|
|
} |
284 |
|
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} |
285 |
|
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|
286 |
jsr166 |
1.32 |
/** |
287 |
|
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* @throws UnsupportedOperationException {@inheritDoc} |
288 |
|
|
* @throws ClassCastException {@inheritDoc} |
289 |
|
|
* @throws NullPointerException {@inheritDoc} |
290 |
|
|
* @throws IllegalArgumentException {@inheritDoc} |
291 |
|
|
*/ |
292 |
dl |
1.17 |
public int drainTo(Collection<? super E> c, int maxElements) { |
293 |
|
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if (c == null) |
294 |
|
|
throw new NullPointerException(); |
295 |
|
|
if (c == this) |
296 |
|
|
throw new IllegalArgumentException(); |
297 |
|
|
if (maxElements <= 0) |
298 |
|
|
return 0; |
299 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
300 |
dl |
1.17 |
lock.lock(); |
301 |
|
|
try { |
302 |
|
|
int n = 0; |
303 |
|
|
while (n < maxElements) { |
304 |
|
|
E first = q.peek(); |
305 |
|
|
if (first == null || first.getDelay(TimeUnit.NANOSECONDS) > 0) |
306 |
|
|
break; |
307 |
|
|
c.add(q.poll()); |
308 |
|
|
++n; |
309 |
|
|
} |
310 |
|
|
if (n > 0) |
311 |
|
|
available.signalAll(); |
312 |
|
|
return n; |
313 |
|
|
} finally { |
314 |
|
|
lock.unlock(); |
315 |
|
|
} |
316 |
|
|
} |
317 |
|
|
|
318 |
dholmes |
1.7 |
/** |
319 |
|
|
* Atomically removes all of the elements from this delay queue. |
320 |
|
|
* The queue will be empty after this call returns. |
321 |
jsr166 |
1.32 |
* Elements with an unexpired delay are not waited for; they are |
322 |
|
|
* simply discarded from the queue. |
323 |
dholmes |
1.7 |
*/ |
324 |
dl |
1.2 |
public void clear() { |
325 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
326 |
dl |
1.2 |
lock.lock(); |
327 |
|
|
try { |
328 |
|
|
q.clear(); |
329 |
tim |
1.13 |
} finally { |
330 |
dl |
1.2 |
lock.unlock(); |
331 |
|
|
} |
332 |
|
|
} |
333 |
tim |
1.1 |
|
334 |
dholmes |
1.7 |
/** |
335 |
|
|
* Always returns <tt>Integer.MAX_VALUE</tt> because |
336 |
|
|
* a <tt>DelayQueue</tt> is not capacity constrained. |
337 |
jsr166 |
1.32 |
* |
338 |
dholmes |
1.7 |
* @return <tt>Integer.MAX_VALUE</tt> |
339 |
|
|
*/ |
340 |
dl |
1.2 |
public int remainingCapacity() { |
341 |
|
|
return Integer.MAX_VALUE; |
342 |
tim |
1.1 |
} |
343 |
dl |
1.2 |
|
344 |
jsr166 |
1.32 |
/** |
345 |
|
|
* Returns an array containing all of the elements in this queue. |
346 |
|
|
* The returned array elements are in no particular order. |
347 |
|
|
* |
348 |
|
|
* <p>The returned array will be "safe" in that no references to it are |
349 |
|
|
* maintained by this queue. (In other words, this method must allocate |
350 |
|
|
* a new array). The caller is thus free to modify the returned array. |
351 |
jsr166 |
1.33 |
* |
352 |
jsr166 |
1.32 |
* <p>This method acts as bridge between array-based and collection-based |
353 |
|
|
* APIs. |
354 |
|
|
* |
355 |
|
|
* @return an array containing all of the elements in this queue |
356 |
|
|
*/ |
357 |
dl |
1.2 |
public Object[] toArray() { |
358 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
359 |
dl |
1.2 |
lock.lock(); |
360 |
|
|
try { |
361 |
|
|
return q.toArray(); |
362 |
tim |
1.13 |
} finally { |
363 |
dl |
1.2 |
lock.unlock(); |
364 |
|
|
} |
365 |
tim |
1.1 |
} |
366 |
dl |
1.2 |
|
367 |
jsr166 |
1.32 |
/** |
368 |
|
|
* Returns an array containing all of the elements in this queue; the |
369 |
|
|
* runtime type of the returned array is that of the specified array. |
370 |
|
|
* The returned array elements are in no particular order. |
371 |
|
|
* If the queue fits in the specified array, it is returned therein. |
372 |
|
|
* Otherwise, a new array is allocated with the runtime type of the |
373 |
|
|
* specified array and the size of this queue. |
374 |
|
|
* |
375 |
|
|
* <p>If this queue fits in the specified array with room to spare |
376 |
|
|
* (i.e., the array has more elements than this queue), the element in |
377 |
|
|
* the array immediately following the end of the queue is set to |
378 |
|
|
* <tt>null</tt>. |
379 |
|
|
* |
380 |
|
|
* <p>Like the {@link #toArray()} method, this method acts as bridge between |
381 |
|
|
* array-based and collection-based APIs. Further, this method allows |
382 |
|
|
* precise control over the runtime type of the output array, and may, |
383 |
|
|
* under certain circumstances, be used to save allocation costs. |
384 |
|
|
* |
385 |
jsr166 |
1.37 |
* <p>The following code can be used to dump a delay queue into a newly |
386 |
|
|
* allocated array of <tt>Delayed</tt>: |
387 |
jsr166 |
1.32 |
* |
388 |
|
|
* <pre> |
389 |
jsr166 |
1.37 |
* Delayed[] a = q.toArray(new Delayed[0]);</pre> |
390 |
jsr166 |
1.32 |
* |
391 |
|
|
* Note that <tt>toArray(new Object[0])</tt> is identical in function to |
392 |
|
|
* <tt>toArray()</tt>. |
393 |
|
|
* |
394 |
|
|
* @param a the array into which the elements of the queue are to |
395 |
|
|
* be stored, if it is big enough; otherwise, a new array of the |
396 |
|
|
* same runtime type is allocated for this purpose |
397 |
|
|
* @return an array containing all of the elements in this queue |
398 |
|
|
* @throws ArrayStoreException if the runtime type of the specified array |
399 |
|
|
* is not a supertype of the runtime type of every element in |
400 |
|
|
* this queue |
401 |
|
|
* @throws NullPointerException if the specified array is null |
402 |
|
|
*/ |
403 |
|
|
public <T> T[] toArray(T[] a) { |
404 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
405 |
dl |
1.2 |
lock.lock(); |
406 |
|
|
try { |
407 |
jsr166 |
1.32 |
return q.toArray(a); |
408 |
tim |
1.13 |
} finally { |
409 |
dl |
1.2 |
lock.unlock(); |
410 |
|
|
} |
411 |
tim |
1.1 |
} |
412 |
|
|
|
413 |
dl |
1.26 |
/** |
414 |
|
|
* Removes a single instance of the specified element from this |
415 |
dl |
1.36 |
* queue, if it is present, whether or not it has expired. |
416 |
dl |
1.26 |
*/ |
417 |
dholmes |
1.7 |
public boolean remove(Object o) { |
418 |
dl |
1.21 |
final ReentrantLock lock = this.lock; |
419 |
dl |
1.2 |
lock.lock(); |
420 |
|
|
try { |
421 |
dholmes |
1.7 |
return q.remove(o); |
422 |
tim |
1.13 |
} finally { |
423 |
dl |
1.2 |
lock.unlock(); |
424 |
|
|
} |
425 |
|
|
} |
426 |
|
|
|
427 |
dholmes |
1.7 |
/** |
428 |
dl |
1.36 |
* Returns an iterator over all the elements (both expired and |
429 |
|
|
* unexpired) in this queue. The iterator does not |
430 |
jsr166 |
1.43 |
* return the elements in any particular order. |
431 |
dholmes |
1.7 |
* |
432 |
jsr166 |
1.32 |
* @return an iterator over the elements in this queue |
433 |
dholmes |
1.7 |
*/ |
434 |
dl |
1.3 |
public Iterator<E> iterator() { |
435 |
dl |
1.42 |
return new Itr<E>(toArray()); |
436 |
dl |
1.2 |
} |
437 |
|
|
|
438 |
dl |
1.42 |
/** |
439 |
|
|
* Snapshot iterator that works off copy of underlying q array. |
440 |
|
|
*/ |
441 |
dl |
1.3 |
private class Itr<E> implements Iterator<E> { |
442 |
dl |
1.42 |
final Object[] array; // Array of all elements |
443 |
|
|
int cursor; // index of next element to return; |
444 |
|
|
int lastRet; // index of last element, or -1 if no such |
445 |
jsr166 |
1.43 |
|
446 |
dl |
1.42 |
Itr(Object[] array) { |
447 |
|
|
lastRet = -1; |
448 |
|
|
this.array = array; |
449 |
dl |
1.2 |
} |
450 |
|
|
|
451 |
tim |
1.6 |
public boolean hasNext() { |
452 |
dl |
1.42 |
return cursor < array.length; |
453 |
tim |
1.6 |
} |
454 |
|
|
|
455 |
|
|
public E next() { |
456 |
dl |
1.42 |
if (cursor >= array.length) |
457 |
|
|
throw new NoSuchElementException(); |
458 |
|
|
lastRet = cursor; |
459 |
|
|
return (E)array[cursor++]; |
460 |
tim |
1.6 |
} |
461 |
|
|
|
462 |
|
|
public void remove() { |
463 |
jsr166 |
1.43 |
if (lastRet < 0) |
464 |
dl |
1.42 |
throw new IllegalStateException(); |
465 |
|
|
Object x = array[lastRet]; |
466 |
|
|
lastRet = -1; |
467 |
|
|
// Traverse underlying queue to find == element, |
468 |
|
|
// not just a .equals element. |
469 |
dl |
1.2 |
lock.lock(); |
470 |
|
|
try { |
471 |
dl |
1.42 |
for (Iterator it = q.iterator(); it.hasNext(); ) { |
472 |
|
|
if (it.next() == x) { |
473 |
|
|
it.remove(); |
474 |
|
|
return; |
475 |
|
|
} |
476 |
|
|
} |
477 |
tim |
1.13 |
} finally { |
478 |
dl |
1.2 |
lock.unlock(); |
479 |
|
|
} |
480 |
tim |
1.6 |
} |
481 |
tim |
1.1 |
} |
482 |
|
|
|
483 |
|
|
} |