public class MailAccessDelayQueue extends java.util.AbstractQueue<MailAccessDelayElement> implements java.util.concurrent.BlockingQueue<MailAccessDelayElement>
Modifier and Type | Class and Description |
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static interface |
MailAccessDelayQueue.ElementFilter
Simple condition interface.
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Constructor and Description |
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MailAccessDelayQueue()
Creates a new MailAccessWatcherDelayQueue that is initially empty.
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MailAccessDelayQueue(java.util.Collection<? extends MailAccessDelayElement> c)
Creates a MailAccessWatcherDelayQueue initially containing the elements of the given collection of
Delayed
instances. |
Modifier and Type | Method and Description |
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boolean |
add(MailAccessDelayElement 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(java.util.Collection<? super MailAccessDelayElement> c) |
int |
drainTo(java.util.Collection<? super MailAccessDelayElement> c,
int maxElements) |
java.util.Iterator<MailAccessDelayElement> |
iterator()
Returns an iterator over all the elements (both expired and unexpired) in this queue.
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boolean |
offer(MailAccessDelayElement e)
Inserts the specified element into this delay queue.
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boolean |
offer(MailAccessDelayElement e,
long timeout,
java.util.concurrent.TimeUnit unit)
Inserts the specified element into this delay queue.
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MailAccessDelayElement |
peek()
Retrieves, but does not remove, the head of this queue, or returns null if this queue is empty.
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MailAccessDelayElement |
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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MailAccessDelayElement |
poll(long timeout,
java.util.concurrent.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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MailAccessDelayElement |
poll(MailAccessDelayQueue.ElementFilter filter)
Retrieves and removes the head of this queue, or returns null if this queue has no elements with an expired delay or specified filter is not fulfilled.
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void |
put(MailAccessDelayElement e)
Inserts the specified element into this delay queue.
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int |
remainingCapacity()
Always returns Integer.MAX_VALUE because a MailAccessWatcherDelayQueue is not capacity constrained.
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boolean |
remove(java.lang.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() |
MailAccessDelayElement |
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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java.lang.Object[] |
toArray()
Returns an array containing all of the elements in this queue.
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<T> T[] |
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.
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contains, containsAll, isEmpty, removeAll, retainAll, toString
public MailAccessDelayQueue()
public MailAccessDelayQueue(java.util.Collection<? extends MailAccessDelayElement> c)
Delayed
instances.c
- the collection of elements to initially containjava.lang.NullPointerException
- if the specified collection or any of its elements are nullpublic boolean add(MailAccessDelayElement e)
add
in interface java.util.Collection<MailAccessDelayElement>
add
in interface java.util.concurrent.BlockingQueue<MailAccessDelayElement>
add
in interface java.util.Queue<MailAccessDelayElement>
add
in class java.util.AbstractQueue<MailAccessDelayElement>
e
- the element to addCollection.add(E)
)java.lang.NullPointerException
- if the specified element is nullpublic boolean offer(MailAccessDelayElement e)
offer
in interface java.util.concurrent.BlockingQueue<MailAccessDelayElement>
offer
in interface java.util.Queue<MailAccessDelayElement>
e
- the element to addjava.lang.NullPointerException
- if the specified element is nullpublic void put(MailAccessDelayElement e)
put
in interface java.util.concurrent.BlockingQueue<MailAccessDelayElement>
e
- the element to addjava.lang.NullPointerException
public boolean offer(MailAccessDelayElement e, long timeout, java.util.concurrent.TimeUnit unit)
offer
in interface java.util.concurrent.BlockingQueue<MailAccessDelayElement>
e
- the element to addtimeout
- This parameter is ignored as the method never blocksunit
- This parameter is ignored as the method never blocksjava.lang.NullPointerException
public MailAccessDelayElement poll()
poll
in interface java.util.Queue<MailAccessDelayElement>
public MailAccessDelayElement poll(MailAccessDelayQueue.ElementFilter filter)
public MailAccessDelayElement take() throws java.lang.InterruptedException
take
in interface java.util.concurrent.BlockingQueue<MailAccessDelayElement>
java.lang.InterruptedException
public MailAccessDelayElement poll(long timeout, java.util.concurrent.TimeUnit unit) throws java.lang.InterruptedException
poll
in interface java.util.concurrent.BlockingQueue<MailAccessDelayElement>
java.lang.InterruptedException
public MailAccessDelayElement peek()
peek
in interface java.util.Queue<MailAccessDelayElement>
public int size()
size
in interface java.util.Collection<MailAccessDelayElement>
size
in class java.util.AbstractCollection<MailAccessDelayElement>
public int drainTo(java.util.Collection<? super MailAccessDelayElement> c)
drainTo
in interface java.util.concurrent.BlockingQueue<MailAccessDelayElement>
java.lang.UnsupportedOperationException
java.lang.ClassCastException
java.lang.NullPointerException
java.lang.IllegalArgumentException
public int drainTo(java.util.Collection<? super MailAccessDelayElement> c, int maxElements)
drainTo
in interface java.util.concurrent.BlockingQueue<MailAccessDelayElement>
java.lang.UnsupportedOperationException
java.lang.ClassCastException
java.lang.NullPointerException
java.lang.IllegalArgumentException
public void clear()
clear
in interface java.util.Collection<MailAccessDelayElement>
clear
in class java.util.AbstractQueue<MailAccessDelayElement>
public int remainingCapacity()
remainingCapacity
in interface java.util.concurrent.BlockingQueue<MailAccessDelayElement>
public java.lang.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 java.util.Collection<MailAccessDelayElement>
toArray
in class java.util.AbstractCollection<MailAccessDelayElement>
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 java.util.Collection<MailAccessDelayElement>
toArray
in class java.util.AbstractCollection<MailAccessDelayElement>
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 purposejava.lang.ArrayStoreException
- if the runtime type of the specified array is not a supertype of the runtime type of every element in
this queuejava.lang.NullPointerException
- if the specified array is nullpublic boolean remove(java.lang.Object o)
remove
in interface java.util.Collection<MailAccessDelayElement>
remove
in interface java.util.concurrent.BlockingQueue<MailAccessDelayElement>
remove
in class java.util.AbstractCollection<MailAccessDelayElement>
public java.util.Iterator<MailAccessDelayElement> 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.iterator
in interface java.lang.Iterable<MailAccessDelayElement>
iterator
in interface java.util.Collection<MailAccessDelayElement>
iterator
in class java.util.AbstractCollection<MailAccessDelayElement>