org.apache.http.nio.protocol
Interface HttpAsyncClientExchangeHandler

All Superinterfaces:

Cancellable, Closeable

All Known Implementing Classes:

BasicAsyncClientExchangeHandler, PipeliningClientExchangeHandler

public interface HttpAsyncClientExchangeHandler
extends Closeable, Cancellable

HttpAsyncClientExchangeHandler represents a callback interface whose methods get invoked when executing one or multiple HTTP message exchanges on the client side.

Individual HttpAsyncClientExchangeHandler are expected to make use of a HttpProcessor to generate mandatory protocol headers for all outgoing messages and apply common, cross-cutting message transformations to all incoming and outgoing messages. HttpAsyncClientExchangeHandlers can delegate implementation of application specific content generation and processing to a HttpAsyncRequestProducer and a HttpAsyncResponseConsumer.

Since:

4.3

Method Summary

void	consumeContent(ContentDecoder decoder, IOControl ioControl) Invoked to process a chunk of content from the ContentDecoder.
void	failed(Exception ex) Invoked to signal that the response processing terminated abnormally.
HttpRequest	generateRequest() Invoked to generate a HTTP request message head.
void	inputTerminated() Invoked to signal that the connection has been terminated prematurely by the opposite end.
boolean	isDone() Determines whether or not the response processing completed.
void	produceContent(ContentEncoder encoder, IOControl ioControl) Invoked to write out a chunk of content to the ContentEncoder.
void	requestCompleted() Invoked to signal that the request has been fully written out.
void	responseCompleted() Invoked to signal that the response has been fully processed.
void	responseReceived(HttpResponse response) Invoked when a HTTP response message is received.

Methods inherited from interface java.io.Closeable

close

Methods inherited from interface org.apache.http.concurrent.Cancellable

cancel

Method Detail

generateRequest

HttpRequest generateRequest()
                            throws IOException,
                                   HttpException

Invoked to generate a HTTP request message head. The message is expected to implement the HttpEntityEnclosingRequest interface if it is to enclose a content entity. The produceContent(ContentEncoder, IOControl) method will not be invoked if HttpEntityEnclosingRequest.getEntity() returns null.

Returns:

HTTP request message.

Throws:

HttpException - in case of HTTP protocol violation

IOException - in case of an I/O error

produceContent

void produceContent(ContentEncoder encoder,
                    IOControl ioControl)
                    throws IOException

Invoked to write out a chunk of content to the ContentEncoder. The IOControl interface can be used to suspend output event notifications if the producer is temporarily unable to produce more content.

When all content is finished, the producer MUST call ContentEncoder.complete(). Failure to do so may cause the entity to be incorrectly delimited.

Please note that the ContentEncoder object is not thread-safe and should only be used within the context of this method call. The IOControl object can be shared and used on other thread to resume output event notifications when more content is made available.

Parameters:

encoder - content encoder.

ioControl - I/O control of the underlying connection.

Throws:

IOException - in case of an I/O error

requestCompleted

void requestCompleted()

Invoked to signal that the request has been fully written out.

responseReceived

void responseReceived(HttpResponse response)
                      throws IOException,
                             HttpException

Invoked when a HTTP response message is received. Please note that the consumeContent(ContentDecoder, IOControl) method will be invoked only if the response messages has a content entity enclosed.

Parameters:

response - HTTP response message.

Throws:

HttpException - in case of HTTP protocol violation

IOException - in case of an I/O error

consumeContent

void consumeContent(ContentDecoder decoder,
                    IOControl ioControl)
                    throws IOException

Invoked to process a chunk of content from the ContentDecoder. The IOControl interface can be used to suspend input event notifications if the consumer is temporarily unable to process content.

The consumer can use the ContentDecoder.isCompleted() method to find out whether or not the message content has been fully consumed.

Please note that the ContentDecoder object is not thread-safe and should only be used within the context of this method call. The IOControl object can be shared and used on other thread to resume input event notifications when the consumer is capable of processing more content.

Parameters:

decoder - content decoder.

ioControl - I/O control of the underlying connection.

Throws:

IOException - in case of an I/O error

responseCompleted

void responseCompleted()
                       throws IOException,
                              HttpException

Invoked to signal that the response has been fully processed.

Throws:

IOException

HttpException

inputTerminated

void inputTerminated()

Invoked to signal that the connection has been terminated prematurely by the opposite end.

failed

void failed(Exception ex)

Invoked to signal that the response processing terminated abnormally.

Parameters:

ex - exception

isDone

boolean isDone()

Determines whether or not the response processing completed.