Package org.apache.arrow.flight

Class BackpressureStrategy.CallbackBackpressureStrategy

java.lang.Object

org.apache.arrow.flight.BackpressureStrategy.CallbackBackpressureStrategy

All Implemented Interfaces:

BackpressureStrategy

Enclosing interface:

BackpressureStrategy

public static class BackpressureStrategy.CallbackBackpressureStrategy
extends Object
implements BackpressureStrategy

A back pressure strategy that uses callbacks to notify when the client is ready or cancelled.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.arrow.flight.BackpressureStrategy

BackpressureStrategy.CallbackBackpressureStrategy, BackpressureStrategy.WaitResult

Constructor Summary

Constructors

Constructor	Description
CallbackBackpressureStrategy()

Method Summary

Modifier and Type	Method	Description
protected void	cancelCallback()	Callback to execute when the listener is cancelled.
void	interruptWait()	Interrupt waiting on the listener to change state.
protected void	readyCallback()	Callback to execute when the listener becomes ready.
void	register(FlightProducer.ServerStreamListener listener)	Set up operations to work against the given listener.
protected boolean	shouldContinueWaiting(FlightProducer.ServerStreamListener listener, long remainingTimeout)	Callback function to run to check if the listener should continue to be waited on if it leaves the waiting state without being cancelled, ready, or timed out.
BackpressureStrategy.WaitResult	waitForListener(long timeout)	Waits for the listener to be ready or cancelled up to the given timeout.

Methods inherited from class java.lang.Object

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

Constructor Details

CallbackBackpressureStrategy

public CallbackBackpressureStrategy()

Method Details

register

public void register(FlightProducer.ServerStreamListener listener)

Description copied from interface: BackpressureStrategy

Set up operations to work against the given listener.

This must be called exactly once and before any calls to BackpressureStrategy.waitForListener(long) and OutboundStreamListener.start(VectorSchemaRoot)

Specified by:

register in interface BackpressureStrategy

Parameters:

listener - The listener this strategy applies to.

waitForListener

public BackpressureStrategy.WaitResult waitForListener(long timeout)

Description copied from interface: BackpressureStrategy

Waits for the listener to be ready or cancelled up to the given timeout.

Specified by:

waitForListener in interface BackpressureStrategy

Parameters:

timeout - The timeout in milliseconds. Infinite if timeout is <= 0.

Returns:

The result of the wait.

interruptWait

public void interruptWait()

Interrupt waiting on the listener to change state.

This method can be used in conjunction with shouldContinueWaiting(FlightProducer.ServerStreamListener, long) to allow FlightProducers to terminate streams internally and notify clients.

shouldContinueWaiting

protected boolean shouldContinueWaiting(FlightProducer.ServerStreamListener listener,
 long remainingTimeout)

Callback function to run to check if the listener should continue to be waited on if it leaves the waiting state without being cancelled, ready, or timed out.

This method should be used to determine if the wait on the listener was interrupted explicitly using a call to interruptWait() or if it was woken up due to a spurious wake.

readyCallback

protected void readyCallback()

Callback to execute when the listener becomes ready.

cancelCallback

protected void cancelCallback()

Callback to execute when the listener is cancelled.