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Java Source Code / Java Documentation » Web Crawler » heritrix » org.archive.queue

Source Cross Reference Class Diagram Java Document (Java Doc)

org.archive.queue .Queue

Queue
public interface Queue (Code)
	An Abstract queue. It should implement FIFO semantics. author: gojomo

Method Summary
long	deleteMatchedItems(Predicate matcher) All objects in the queue where `matcher.match(object)` returns true will be deleted from the queue.
T	dequeue()
void	enqueue(T obj)
Iterator<T>	getIterator(boolean inCacheOnly) Returns an iterator for the queue.
boolean	isEmpty()
long	length()
T	peek() Give the top object in the queue, leaving it in place to be returned by future peek() or dequeue() invocations.
void	release()
void	unpeek() Releases queue from the obligation to return in the next peek()/dequeue() the same object as returned by any previous peek().

Method Detail

deleteMatchedItems
long deleteMatchedItems(Predicate matcher)(Code)
	All objects in the queue where `matcher.match(object)` returns true will be deleted from the queue. Making other changes to the queue while this method is being processed is not safe. Parameters: matcher - a predicate the number of deleted items

dequeue
T dequeue() throws NoSuchElementException(Code)
	remove an entry from the start of the queue the object throws: java.util.NoSuchElementException -

enqueue
void enqueue(T obj)(Code)
	Add an entry to the end of queue Parameters: obj - the entry to queue

getIterator

Iterator<T> getIterator(boolean inCacheOnly)(Code)

Returns an iterator for the queue.

The returned iterator's remove method is considered unsafe.

Editing the queue while using the iterator is not safe.
Parameters:
inCacheOnly - an iterator for the queue

isEmpty
boolean isEmpty()(Code)
	is the queue empty? `true` if the queue has no elements

length
long length()(Code)
	get the number of elements in the queue the number of elements in the queue

peek
T peek()(Code)
	Give the top object in the queue, leaving it in place to be returned by future peek() or dequeue() invocations. top object, without removing it

release
void release()(Code)
	release any OS/IO resources associated with Queue

unpeek
void unpeek()(Code)
	Releases queue from the obligation to return in the next peek()/dequeue() the same object as returned by any previous peek().

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