1 |
/* |
2 |
* 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 |
* http://creativecommons.org/licenses/publicdomain |
5 |
*/ |
6 |
|
7 |
package java.util.concurrent; |
8 |
import java.util.*; |
9 |
|
10 |
/** |
11 |
* Static methods that operate on or return instances of collection |
12 |
* and synchronizer classes and interfaces defined in this package. |
13 |
* |
14 |
* @since 1.6 |
15 |
* @author Doug Lea |
16 |
*/ |
17 |
|
18 |
|
19 |
public class Concurrent { |
20 |
/** |
21 |
* Returns a view of a {@link BlockingDeque} as a stack-based |
22 |
* Last-in-first-out (Lifo) {@link BlockingQueue}. Method |
23 |
* <tt>put</tt> is mapped to <tt>putFirst</tt>, <tt>take</tt> is |
24 |
* mapped to <tt>takeFirst</tt> and so on. This view can be useful |
25 |
* when you would like to use a method requiring a |
26 |
* <tt>BlockingQueue</tt> but you need Lifo ordering. |
27 |
* @param deque the BlockingDeque |
28 |
* @return the queue |
29 |
*/ |
30 |
public static <T> BlockingQueue<T> asLifoBlockingQueue(BlockingDeque<T> deque){ |
31 |
return new AsLIFOBlockingQueue<T>(deque); |
32 |
} |
33 |
|
34 |
static class AsLIFOBlockingQueue<E> extends AbstractQueue<E> |
35 |
implements BlockingQueue<E>, java.io.Serializable { |
36 |
private final BlockingDeque<E> q; |
37 |
AsLIFOBlockingQueue(BlockingDeque<E> q) { this.q = q; } |
38 |
public boolean offer(E e) { return q.offerFirst(e); } |
39 |
public E poll() { return q.pollFirst(); } |
40 |
public E remove() { return q.removeFirst(); } |
41 |
public E peek() { return q.peekFirst(); } |
42 |
public E element() { return q.getFirst(); } |
43 |
public int size() { return q.size(); } |
44 |
public boolean isEmpty() { return q.isEmpty(); } |
45 |
public boolean contains(Object o) { return q.contains(o); } |
46 |
public Iterator<E> iterator() { return q.iterator(); } |
47 |
public Object[] toArray() { return q.toArray(); } |
48 |
public <T> T[] toArray(T[] a) { return q.toArray(a); } |
49 |
public boolean add(E e) { return q.offerFirst(e); } |
50 |
public boolean remove(Object o) { return q.remove(o); } |
51 |
public void clear() { q.clear(); } |
52 |
public int remainingCapacity() { return q.remainingCapacity(); } |
53 |
public int drainTo(Collection<? super E> c) { return q.drainTo(c); } |
54 |
public int drainTo(Collection<? super E> c, int m) { |
55 |
return q.drainTo(c, m); |
56 |
} |
57 |
public void put(E e) throws InterruptedException { q.putFirst(e); } |
58 |
public E take() throws InterruptedException { return q.takeFirst(); } |
59 |
public boolean offer(E e, long timeout, TimeUnit unit) |
60 |
throws InterruptedException { |
61 |
return q.offerFirst(e, timeout, unit); |
62 |
} |
63 |
public E poll(long timeout, TimeUnit unit) |
64 |
throws InterruptedException { |
65 |
return q.pollFirst(timeout, unit); |
66 |
} |
67 |
} |
68 |
|
69 |
} |