Class QueueIteration<E,T extends Exception>
java.lang.Object
org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E,X>
org.eclipse.rdf4j.common.iteration.LookAheadIteration<E,T>
org.eclipse.rdf4j.common.iteration.QueueIteration<E,T>
- All Implemented Interfaces:
AutoCloseable,CloseableIteration<E,,T> Iteration<E,T>
- Direct Known Subclasses:
QueueCursor
@Deprecated(since="4.1.0")
public abstract class QueueIteration<E,T extends Exception>
extends LookAheadIteration<E,T>
Deprecated.
Makes working with a queue easier by adding the methods
done() and toss(Exception) and after
converting the Exception to the required type using convert(Exception).- Author:
- James Leigh
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Constructor Summary
ConstructorsModifierConstructorDescriptionprotectedQueueIteration(int capacity) Deprecated.Creates an QueueIteration with the given (fixed) capacity and default access policy.protectedQueueIteration(int capacity, boolean fair) Deprecated.Creates an QueueIteration with the given (fixed) capacity and the specified access policy.protectedQueueIteration(int capacity, boolean fair, WeakReference<?> callerRef) Deprecated, for removal: This API element is subject to removal in a future version.WeakReference is no longer supported as a way to automatically close this iteration.protectedQueueIteration(int capacity, WeakReference<?> callerRef) Deprecated, for removal: This API element is subject to removal in a future version.WeakReference is no longer supported as a way to automatically close this iteration.protectedQueueIteration(BlockingQueue<E> queue) Deprecated.Creates an QueueIteration with the givenBlockingQueueas its backing queue.
It may not be threadsafe to modify or access the givenBlockingQueuefrom other locations.protectedQueueIteration(BlockingQueue<E> queue, WeakReference<?> callerRef) Deprecated, for removal: This API element is subject to removal in a future version.WeakReference is no longer supported as a way to automatically close this iteration. -
Method Summary
Modifier and TypeMethodDescriptionvoidDeprecated.protected abstract TDeprecated.Converts an exception from the underlying iteration to an exception of type X.voiddone()Deprecated.Indicates the methodput(Object)will not be called in the queue anymore.Deprecated.Returns the next item in the queue, which may be null, or throws an exception.voidDeprecated.Called byAbstractCloseableIteration.close()when it is called for the first time.voidDeprecated.Adds another item to the queue, blocking while the queue is full.voidDeprecated.The next timeLookAheadIteration.next()is called this exception will be thrown.Methods inherited from class org.eclipse.rdf4j.common.iteration.LookAheadIteration
hasNext, next, removeMethods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration
close, isClosedMethods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration
stream
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Constructor Details
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QueueIteration
protected QueueIteration(int capacity) Deprecated.Creates an QueueIteration with the given (fixed) capacity and default access policy.- Parameters:
capacity- the capacity of this queue
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QueueIteration
@Deprecated(since="4.1.2", forRemoval=true) protected QueueIteration(int capacity, WeakReference<?> callerRef) Deprecated, for removal: This API element is subject to removal in a future version.WeakReference is no longer supported as a way to automatically close this iteration. The recommended approach to automatically closing an iteration on garbage collection is to use aCleaner.Creates an QueueIteration with the given (fixed) capacity and default access policy.- Parameters:
capacity- the capacity of this queue
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QueueIteration
@Deprecated(since="4.1.2", forRemoval=true) protected QueueIteration(int capacity, boolean fair, WeakReference<?> callerRef) Deprecated, for removal: This API element is subject to removal in a future version.WeakReference is no longer supported as a way to automatically close this iteration. The recommended approach to automatically closing an iteration on garbage collection is to use aCleaner.Creates an QueueIteration with the given (fixed) capacity and the specified access policy.- Parameters:
capacity- the capacity of this queuefair- if true then queue accesses for threads blocked on insertion or removal, are processed in FIFO order; if false the access order is unspecified.
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QueueIteration
protected QueueIteration(int capacity, boolean fair) Deprecated.Creates an QueueIteration with the given (fixed) capacity and the specified access policy.- Parameters:
capacity- the capacity of this queuefair- if true then queue accesses for threads blocked on insertion or removal, are processed in FIFO order; if false the access order is unspecified.
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QueueIteration
@Deprecated(since="4.1.2", forRemoval=true) protected QueueIteration(BlockingQueue<E> queue, WeakReference<?> callerRef) Deprecated, for removal: This API element is subject to removal in a future version.WeakReference is no longer supported as a way to automatically close this iteration. The recommended approach to automatically closing an iteration on garbage collection is to use aCleaner.Creates an QueueIteration with the givenBlockingQueueas its backing queue.
It may not be threadsafe to modify or access the givenBlockingQueuefrom other locations. This method only enables the defaultArrayBlockingQueueto be overridden.- Parameters:
queue- A BlockingQueue that is not used in other locations, but will be used as the backing Queue implementation for this cursor.
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QueueIteration
Deprecated.Creates an QueueIteration with the givenBlockingQueueas its backing queue.
It may not be threadsafe to modify or access the givenBlockingQueuefrom other locations. This method only enables the defaultArrayBlockingQueueto be overridden.- Parameters:
queue- A BlockingQueue that is not used in other locations, but will be used as the backing Queue implementation for this cursor.
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Method Details
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convert
Deprecated.Converts an exception from the underlying iteration to an exception of type X. -
toss
Deprecated.The next timeLookAheadIteration.next()is called this exception will be thrown. If it is not a QueryEvaluationException or RuntimeException it will be wrapped in a QueryEvaluationException. -
put
Deprecated.Adds another item to the queue, blocking while the queue is full.- Throws:
InterruptedExceptionT extends Exception
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done
public void done()Deprecated.Indicates the methodput(Object)will not be called in the queue anymore. -
getNextElement
Deprecated.Returns the next item in the queue, which may be null, or throws an exception.- Specified by:
getNextElementin classLookAheadIteration<E,T extends Exception> - Returns:
- The next element, or null if no more elements are available.
- Throws:
T extends Exception
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handleClose
Deprecated.Description copied from class:AbstractCloseableIterationCalled byAbstractCloseableIteration.close()when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.- Overrides:
handleClosein classLookAheadIteration<E,T extends Exception> - Throws:
T extends Exception
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checkException
Deprecated.
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