Class BatcherImpl<ElementT,ElementResultT,RequestT,ResponseT> (2.19.1)

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public class BatcherImpl<ElementT,ElementResultT,RequestT,ResponseT> implements Batcher<ElementT,ElementResultT>

Queues up the elements until #flush() is called; once batching is over, returned future resolves.

This class is not thread-safe, and expects to be used from a single thread.

Inheritance

java.lang.Object > BatcherImpl<ElementT,ElementResultT,RequestT,ResponseT>

Implements

com.google.api.gax.batching.Batcher<ElementT,ElementResultT>

Type Parameters

NameDescription
ElementT
ElementResultT
RequestT
ResponseT

Constructors

BatcherImpl(BatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT> batchingDescriptor, UnaryCallable<RequestT,ResponseT> unaryCallable, RequestT prototype, BatchingSettings batchingSettings, ScheduledExecutorService executor) (deprecated)

public BatcherImpl(BatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT> batchingDescriptor, UnaryCallable<RequestT,ResponseT> unaryCallable, RequestT prototype, BatchingSettings batchingSettings, ScheduledExecutorService executor)

Deprecated. Please instantiate the Batcher with FlowController and ApiCallContext

Parameters
NameDescription
batchingDescriptorBatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT>

a BatchingDescriptor for transforming individual elements into wrappers request and response

unaryCallableUnaryCallable<RequestT,ResponseT>

a UnaryCallable object

prototypeRequestT

a RequestT object

batchingSettingsBatchingSettings

a BatchingSettings with configuration of thresholds

executorScheduledExecutorService

BatcherImpl(BatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT> batchingDescriptor, UnaryCallable<RequestT,ResponseT> unaryCallable, RequestT prototype, BatchingSettings batchingSettings, ScheduledExecutorService executor, FlowController flowController) (deprecated)

public BatcherImpl(BatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT> batchingDescriptor, UnaryCallable<RequestT,ResponseT> unaryCallable, RequestT prototype, BatchingSettings batchingSettings, ScheduledExecutorService executor, FlowController flowController)

Deprecated. Please instantiate the Batcher with ApiCallContext

Parameters
NameDescription
batchingDescriptorBatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT>

a BatchingDescriptor for transforming individual elements into wrappers request and response

unaryCallableUnaryCallable<RequestT,ResponseT>

a UnaryCallable object

prototypeRequestT

a RequestT object

batchingSettingsBatchingSettings

a BatchingSettings with configuration of thresholds

executorScheduledExecutorService
flowControllerFlowController

a FlowController for throttling requests. If it's null, create a FlowController object from BatchingSettings#getFlowControlSettings().

BatcherImpl(BatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT> batchingDescriptor, UnaryCallable<RequestT,ResponseT> unaryCallable, RequestT prototype, BatchingSettings batchingSettings, ScheduledExecutorService executor, FlowController flowController, ApiCallContext callContext)

public BatcherImpl(BatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT> batchingDescriptor, UnaryCallable<RequestT,ResponseT> unaryCallable, RequestT prototype, BatchingSettings batchingSettings, ScheduledExecutorService executor, FlowController flowController, ApiCallContext callContext)
Parameters
NameDescription
batchingDescriptorBatchingDescriptor<ElementT,ElementResultT,RequestT,ResponseT>

a BatchingDescriptor for transforming individual elements into wrappers request and response

unaryCallableUnaryCallable<RequestT,ResponseT>

a UnaryCallable object

prototypeRequestT

a RequestT object

batchingSettingsBatchingSettings

a BatchingSettings with configuration of thresholds

executorScheduledExecutorService
flowControllerFlowController

a FlowController for throttling requests. If it's null, create a FlowController object from BatchingSettings#getFlowControlSettings().

callContextApiCallContext

a ApiCallContext object that'll be merged in unaryCallable

Methods

add(ElementT element)

public ApiFuture<ElementResultT> add(ElementT element)

Queues the passed in element to be sent at some point in the future.

The element will be sent as part of a larger batch request at some point in the future. The returned ApiFuture will be resolved once the result for the element has been extracted from the batch response.

Note: Cancelling returned result simply marks the future cancelled, It would not stop the batch request.

Parameter
NameDescription
elementElementT
Returns
TypeDescription
com.google.api.core.ApiFuture<ElementResultT>

close()

public void close()

Closes this Batcher by preventing new elements from being added, and then flushing the existing elements.

Exceptions
TypeDescription
InterruptedException

closeAsync()

public ApiFuture<Void> closeAsync()

Closes this Batcher by preventing new elements from being added, and then sending outstanding elements. The returned future will be resolved when the last element completes

Returns
TypeDescription
com.google.api.core.ApiFuture<Void>

flush()

public void flush()

Synchronously sends any pending elements as a batch and waits for all outstanding batches to be complete.

Exceptions
TypeDescription
InterruptedException

getFlowController()

public FlowController getFlowController()
Returns
TypeDescription
FlowController

sendOutstanding()

public void sendOutstanding()

Sends accumulated elements asynchronously for batching.

Note: This method can be invoked concurrently unlike #add and #close, which can only be called from a single user thread. Please take caution to avoid race condition.