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JavaTM 2 Platform Std. Ed. v1.6.0
java.util.concurrent
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Constructor Summary | |
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DelayQueue()
Creates a new DelayQueue that is initially empty. |
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DelayQueue(Collection<? extends E> c)
Creates a DelayQueue initially containing the elements of the given collection of Delayed instances. |
Method Summary | ||
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boolean |
add(E e)
Inserts the specified element into this delay queue. |
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void |
clear()
Atomically removes all of the elements from this delay queue. |
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int |
drainTo(Collection<? super E> c)
Removes all available elements from this queue and adds them to the given collection. |
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int |
drainTo(Collection<? super E> c,
int maxElements)
Removes at most the given number of available elements from this queue and adds them to the given collection. |
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Iterator<E> |
iterator()
Returns an iterator over all the elements (both expired and unexpired) in this queue. |
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boolean |
offer(E e)
Inserts the specified element into this delay queue. |
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boolean |
offer(E e,
long timeout,
TimeUnit unit)
Inserts the specified element into this delay queue. |
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E |
peek()
Retrieves, but does not remove, the head of this queue, or returns null if this queue is empty. |
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E |
poll()
Retrieves and removes the head of this queue, or returns null if this queue has no elements with an expired delay. |
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E |
poll(long timeout,
TimeUnit unit)
Retrieves and removes the head of this queue, waiting if necessary until an element with an expired delay is available on this queue, or the specified wait time expires. |
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void |
put(E e)
Inserts the specified element into this delay queue. |
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int |
remainingCapacity()
Always returns Integer.MAX_VALUE because a DelayQueue is not capacity constrained. |
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boolean |
remove(Object o)
Removes a single instance of the specified element from this queue, if it is present, whether or not it has expired. |
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int |
size()
Returns the number of elements in this collection. |
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E |
take()
Retrieves and removes the head of this queue, waiting if necessary until an element with an expired delay is available on this queue. |
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Object[] |
toArray()
Returns an array containing all of the elements in this queue. |
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toArray(T[] a)
Returns an array containing all of the elements in this queue; the runtime type of the returned array is that of the specified array. |
Methods inherited from class java.util.AbstractQueue |
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addAll, element, remove |
Methods inherited from class java.util.AbstractCollection |
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contains, containsAll, isEmpty, removeAll, retainAll, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.concurrent.BlockingQueue |
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contains |
Methods inherited from interface java.util.Queue |
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element, remove |
Methods inherited from interface java.util.Collection |
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addAll, containsAll, equals, hashCode, isEmpty, removeAll, retainAll |
Constructor Detail |
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public DelayQueue()
public DelayQueue(Collection<? extends E> c)
Delayed
instances.
c
- the collection of elements to initially contain
NullPointerException
- if the specified collection or any
of its elements are nullMethod Detail |
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public boolean add(E e)
e
- the element to add
Collection.add(E)
)
NullPointerException
- if the specified element is nullpublic boolean offer(E e)
e
- the element to add
NullPointerException
- if the specified element is nullpublic void put(E e)
put
in interface BlockingQueue<E extends Delayed>
e
- the element to add
NullPointerException
- if the specified element is nullpublic boolean offer(E e, long timeout, TimeUnit unit)
offer
in interface BlockingQueue<E extends Delayed>
e
- the element to addtimeout
- This parameter is ignored as the method never blocksunit
- This parameter is ignored as the method never blocks
NullPointerException
- if the specified element is nullpublic E poll()
public E take() throws InterruptedException
take
in interface BlockingQueue<E extends Delayed>
InterruptedException
- if interrupted while waitingpublic E poll(long timeout, TimeUnit unit) throws InterruptedException
poll
in interface BlockingQueue<E extends Delayed>
timeout
- how long to wait before giving up, in units of
unitunit
- a TimeUnit determining how to interpret the
timeout parameter
InterruptedException
- if interrupted while waitingpublic E peek()
public int size()
Collection
size
in interface Collection<E extends Delayed>
size
in class AbstractCollection<E extends Delayed>
public int drainTo(Collection<? super E> c)
BlockingQueue
drainTo
in interface BlockingQueue<E extends Delayed>
c
- the collection to transfer elements into
UnsupportedOperationException
- if addition of elements
is not supported by the specified collection
ClassCastException
- if the class of an element of this queue
prevents it from being added to the specified collection
NullPointerException
- if the specified collection is null
IllegalArgumentException
- if the specified collection is this
queue, or some property of an element of this queue prevents
it from being added to the specified collectionpublic int drainTo(Collection<? super E> c, int maxElements)
BlockingQueue
drainTo
in interface BlockingQueue<E extends Delayed>
c
- the collection to transfer elements intomaxElements
- the maximum number of elements to transfer
UnsupportedOperationException
- if addition of elements
is not supported by the specified collection
ClassCastException
- if the class of an element of this queue
prevents it from being added to the specified collection
NullPointerException
- if the specified collection is null
IllegalArgumentException
- if the specified collection is this
queue, or some property of an element of this queue prevents
it from being added to the specified collectionpublic void clear()
clear
in interface Collection<E extends Delayed>
clear
in class AbstractQueue<E extends Delayed>
public int remainingCapacity()
remainingCapacity
in interface BlockingQueue<E extends Delayed>
public Object[] toArray()
The returned array will be "safe" in that no references to it are maintained by this queue. (In other words, this method must allocate a new array). The caller is thus free to modify the returned array.
This method acts as bridge between array-based and collection-based APIs.
toArray
in interface Collection<E extends Delayed>
toArray
in class AbstractCollection<E extends Delayed>
public <T> T[] toArray(T[] a)
If this queue fits in the specified array with room to spare (i.e., the array has more elements than this queue), the element in the array immediately following the end of the queue is set to null.
Like the toArray()
method, this method acts as bridge between
array-based and collection-based APIs. Further, this method allows
precise control over the runtime type of the output array, and may,
under certain circumstances, be used to save allocation costs.
The following code can be used to dump a delay queue into a newly allocated array of Delayed:
Delayed[] a = q.toArray(new Delayed[0]);Note that toArray(new Object[0]) is identical in function to toArray().
toArray
in interface Collection<E extends Delayed>
toArray
in class AbstractCollection<E extends Delayed>
a
- the array into which the elements of the queue are to
be stored, if it is big enough; otherwise, a new array of the
same runtime type is allocated for this purpose
ArrayStoreException
- if the runtime type of the specified array
is not a supertype of the runtime type of every element in
this queue
NullPointerException
- if the specified array is nullpublic boolean remove(Object o)
remove
in interface Collection<E extends Delayed>
remove
in interface BlockingQueue<E extends Delayed>
remove
in class AbstractCollection<E extends Delayed>
o
- element to be removed from this collection, if present
public Iterator<E> iterator()
ConcurrentModificationException
, and
guarantees to traverse elements as they existed upon
construction of the iterator, and may (but is not guaranteed
to) reflect any modifications subsequent to construction.