org.apache.flink.streaming.api.operators.async.queue

类 OrderedStreamElementQueue<OUT>

java.lang.Object

org.apache.flink.streaming.api.operators.async.queue.OrderedStreamElementQueue<OUT>

所有已实现的接口:

StreamElementQueue<OUT>

@Internal
public final class OrderedStreamElementQueue<OUT>
extends Object
implements StreamElementQueue<OUT>

Ordered StreamElementQueue implementation. The ordered stream element queue provides asynchronous results in the order in which the StreamElementQueueEntry have been added to the queue. Thus, even if the completion order can be arbitrary, the output order strictly follows the insertion order (element cannot overtake each other).

构造器概要

构造器

构造器和说明
OrderedStreamElementQueue(int capacity)

方法概要

限定符和类型	方法和说明
void	emitCompletedElement(TimestampedCollector<OUT> output) Emits one completed element from the head of this queue into the given output.
boolean	hasCompletedElements() Checks if there is at least one completed head element.
boolean	isEmpty() True if the queue is empty; otherwise false.
int	size() Return the size of the queue.
Optional<ResultFuture<OUT>>	tryPut(StreamElement streamElement) Tries to put the given element in the queue.
List<StreamElement>	values() Returns the collection of StreamElement currently contained in this queue for checkpointing.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

OrderedStreamElementQueue

public OrderedStreamElementQueue(int capacity)

方法详细资料

hasCompletedElements

public boolean hasCompletedElements()

从接口复制的说明: StreamElementQueue

Checks if there is at least one completed head element.

指定者:

hasCompletedElements 在接口中 StreamElementQueue<OUT>

返回:

True if there is a completed head element.

emitCompletedElement

public void emitCompletedElement(TimestampedCollector<OUT> output)

从接口复制的说明: StreamElementQueue

Emits one completed element from the head of this queue into the given output.

Will not emit any element if no element has been completed (check StreamElementQueue.hasCompletedElements() before entering any critical section).

指定者:

emitCompletedElement 在接口中 StreamElementQueue<OUT>

参数:

output - the output into which to emit

values

public List<StreamElement> values()

从接口复制的说明: StreamElementQueue

Returns the collection of StreamElement currently contained in this queue for checkpointing.

This includes all non-emitted, completed and non-completed elements.

指定者:

values 在接口中 StreamElementQueue<OUT>

返回:

List of currently contained StreamElement.

isEmpty

public boolean isEmpty()

从接口复制的说明: StreamElementQueue

True if the queue is empty; otherwise false.

指定者:

isEmpty 在接口中 StreamElementQueue<OUT>

返回:

True if the queue is empty; otherwise false.

size

public int size()

从接口复制的说明: StreamElementQueue

Return the size of the queue.

指定者:

size 在接口中 StreamElementQueue<OUT>

返回:

The number of elements contained in this queue.

tryPut

public Optional<ResultFuture<OUT>> tryPut(StreamElement streamElement)

从接口复制的说明: StreamElementQueue

Tries to put the given element in the queue. This operation succeeds if the queue has capacity left and fails if the queue is full.

This method returns a handle to the inserted element that allows to set the result of the computation.

指定者:

tryPut 在接口中 StreamElementQueue<OUT>

参数:

streamElement - the element to be inserted.

返回:

A handle to the element if successful or Optional.empty() otherwise.