Class ReactiveServerExchangeHandler

java.lang.Object

org.apache.hc.core5.reactive.ReactiveServerExchangeHandler

All Implemented Interfaces:

AsyncDataConsumer, AsyncDataExchangeHandler, AsyncDataProducer, AsyncServerExchangeHandler, ResourceHolder

public final class ReactiveServerExchangeHandler
extends Object
implements AsyncServerExchangeHandler

An implementation of AsyncServerExchangeHandler designed to work with reactive streams.

Since:

5.0

Field Summary

Fields

Modifier and Type	Field	Description
private DataStreamChannel	channel
private final ReactiveDataConsumer	requestConsumer
private final ReactiveRequestProcessor	requestProcessor
private final AtomicReference<ReactiveDataProducer>	responseProducer

Constructor Summary

Constructors

Constructor	Description
ReactiveServerExchangeHandler(ReactiveRequestProcessor requestProcessor)	Creates a ReactiveServerExchangeHandler.

Method Summary

Modifier and Type	Method	Description
int	available()	Returns the number of bytes immediately available for output.
void	consume(ByteBuffer src)	Triggered to pass incoming data to the data consumer.
void	failed(Exception cause)	Triggered to signal a failure in data processing.
void	handleRequest(HttpRequest request, EntityDetails entityDetails, ResponseChannel responseChannel, HttpContext context)	Processes the actual HTTP request.
void	produce(DataStreamChannel channel)	Triggered to signal the ability of the underlying data channel to accept more data.
void	releaseResources()
void	streamEnd(List<? extends Header> trailers)	Triggered to signal termination of the data stream.
void	updateCapacity(CapacityChannel capacityChannel)	Triggered to signal ability of the underlying data stream to receive data capacity update.

Methods inherited from class Object

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

Field Details

requestProcessor

private final ReactiveRequestProcessor requestProcessor

responseProducer

private final AtomicReference<ReactiveDataProducer> responseProducer

requestConsumer

private final ReactiveDataConsumer requestConsumer

channel

private volatile DataStreamChannel channel

Constructor Details

ReactiveServerExchangeHandler

public ReactiveServerExchangeHandler(ReactiveRequestProcessor requestProcessor)

Creates a ReactiveServerExchangeHandler.

Parameters:

requestProcessor - the ReactiveRequestProcessor instance to invoke when the request is ready to be handled.

Method Details

handleRequest

public void handleRequest(HttpRequest request,
 EntityDetails entityDetails,
 ResponseChannel responseChannel,
 HttpContext context)
                   throws HttpException,
IOException

Description copied from interface: AsyncServerExchangeHandler

Processes the actual HTTP request. The handler can choose to send response messages immediately inside the call or asynchronously at some later point.

Specified by:

handleRequest in interface AsyncServerExchangeHandler

Parameters:

request - the actual request.

entityDetails - the request entity details or null if the request does not enclose an entity.

responseChannel - the response channel.

context - the actual execution context.

Throws:

HttpException - in case of an HTTP protocol violation.

IOException - in case of an I/O error.

failed

public void failed(Exception cause)

Description copied from interface: AsyncDataExchangeHandler

Triggered to signal a failure in data processing.

Specified by:

failed in interface AsyncDataExchangeHandler

Parameters:

cause - the cause of the failure.

updateCapacity

public void updateCapacity(CapacityChannel capacityChannel)
                    throws IOException

Description copied from interface: AsyncDataConsumer

Triggered to signal ability of the underlying data stream to receive data capacity update. The data consumer can choose to write data immediately inside the call or asynchronously at some later point.

Specified by:

updateCapacity in interface AsyncDataConsumer

Parameters:

capacityChannel - the channel for capacity updates.

Throws:

IOException - in case of an I/O error.

consume

public void consume(ByteBuffer src)
             throws IOException

Description copied from interface: AsyncDataConsumer

Triggered to pass incoming data to the data consumer. The consumer must consume the entire content of the data buffer. The consumer must stop incrementing its capacity on the capacity channel if it is unable to accept more data. Once the data consumer has handled accumulated data or allocated more intermediate storage it can update its capacity information on the capacity channel.

Specified by:

consume in interface AsyncDataConsumer

Parameters:

src - data source.

Throws:

IOException - in case of an I/O error.

streamEnd

public void streamEnd(List<? extends Header> trailers)
               throws HttpException,
IOException

Description copied from interface: AsyncDataConsumer

Triggered to signal termination of the data stream.

Specified by:

streamEnd in interface AsyncDataConsumer

Parameters:

trailers - data stream trailers.

Throws:

HttpException - in case of an HTTP protocol violation.

IOException - in case of an I/O error.

available

public int available()

Description copied from interface: AsyncDataProducer

Returns the number of bytes immediately available for output. This method can be used as a hint to control output events of the underlying I/O session.

Please note this method should return zero if the data producer is unable to produce any more data, in which case AsyncDataProducer.produce(DataStreamChannel) method will not get triggered. The producer can resume writing out data asynchronously once more data becomes available or request output readiness events with DataStreamChannel.requestOutput().

Specified by:

available in interface AsyncDataProducer

Returns:

the number of bytes immediately available for output

See Also:

• AsyncDataProducer.produce(DataStreamChannel)
• DataStreamChannel.requestOutput()

produce

public void produce(DataStreamChannel channel)
             throws IOException

Description copied from interface: AsyncDataProducer

Triggered to signal the ability of the underlying data channel to accept more data. The data producer can choose to write data immediately inside the call or asynchronously at some later point.

Please note this method gets triggered only if AsyncDataProducer.available() returns a positive value.

Specified by:

produce in interface AsyncDataProducer

Parameters:

channel - the data channel capable of accepting more data.

Throws:

IOException - in case of an I/O error.

See Also:

• AsyncDataProducer.available()

releaseResources

public void releaseResources()

Specified by:

releaseResources in interface ResourceHolder