Package org.apache.http.nio.protocol

Class BasicAsyncClientExchangeHandler<T>

java.lang.Object

org.apache.http.nio.protocol.BasicAsyncClientExchangeHandler<T>

Type Parameters:

T - the result type of request execution.

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, Cancellable, HttpAsyncClientExchangeHandler

public class BasicAsyncClientExchangeHandler<T>
extends java.lang.Object
implements HttpAsyncClientExchangeHandler

Basic implementation of HttpAsyncClientExchangeHandler that executes a single HTTP request / response exchange.

Since:

4.3

Constructor Summary

Constructors

Constructor	Description
BasicAsyncClientExchangeHandler(HttpAsyncRequestProducer requestProducer, HttpAsyncResponseConsumer<T> responseConsumer, FutureCallback<T> callback, HttpContext localContext, NHttpClientConnection conn, HttpProcessor httppocessor, ConnectionReuseStrategy connReuseStrategy)	Creates new instance of BasicAsyncRequestExecutionHandler.
BasicAsyncClientExchangeHandler(HttpAsyncRequestProducer requestProducer, HttpAsyncResponseConsumer<T> responseConsumer, HttpContext localContext, NHttpClientConnection conn, HttpProcessor httppocessor)	Creates new instance of BasicAsyncRequestExecutionHandler.

Method Summary

Modifier and Type	Method	Description
boolean	cancel()
void	close()
void	consumeContent(ContentDecoder decoder, IOControl ioctrl)	Invoked to process a chunk of content from the ContentDecoder.
void	failed(java.lang.Exception ex)	Invoked to signal that the response processing terminated abnormally.
HttpRequest	generateRequest()	Invoked to generate a HTTP request message head.
java.util.concurrent.Future<T>	getFuture()
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 ioctrl)	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 class java.lang.Object

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

Constructor Detail

BasicAsyncClientExchangeHandler

public BasicAsyncClientExchangeHandler(HttpAsyncRequestProducer requestProducer,
                                       HttpAsyncResponseConsumer<T> responseConsumer,
                                       FutureCallback<T> callback,
                                       HttpContext localContext,
                                       NHttpClientConnection conn,
                                       HttpProcessor httppocessor,
                                       ConnectionReuseStrategy connReuseStrategy)

Creates new instance of BasicAsyncRequestExecutionHandler.

Parameters:

requestProducer - the request producer.

responseConsumer - the response consumer.

callback - the future callback invoked when the operation is completed.

localContext - the local execution context.

conn - the actual connection.

httppocessor - the HTTP protocol processor.

connReuseStrategy - the connection re-use strategy.

BasicAsyncClientExchangeHandler

public BasicAsyncClientExchangeHandler(HttpAsyncRequestProducer requestProducer,
                                       HttpAsyncResponseConsumer<T> responseConsumer,
                                       HttpContext localContext,
                                       NHttpClientConnection conn,
                                       HttpProcessor httppocessor)

Creates new instance of BasicAsyncRequestExecutionHandler.

Parameters:

requestProducer - the request producer.

responseConsumer - the response consumer.

localContext - the local execution context.

conn - the actual connection.

httppocessor - the HTTP protocol processor.

Method Detail

getFuture

public java.util.concurrent.Future<T> getFuture()

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Throws:

java.io.IOException

generateRequest

public HttpRequest generateRequest()
                            throws java.io.IOException,
                                   HttpException

Description copied from interface: HttpAsyncClientExchangeHandler

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 HttpAsyncClientExchangeHandler.produceContent(ContentEncoder, IOControl) method will not be invoked if HttpEntityEnclosingRequest.getEntity() returns null.

Specified by:

generateRequest in interface HttpAsyncClientExchangeHandler

Returns:

HTTP request message.

Throws:

java.io.IOException - in case of an I/O error

HttpException - in case of HTTP protocol violation

produceContent

public void produceContent(ContentEncoder encoder,
                           IOControl ioctrl)
                    throws java.io.IOException

Description copied from interface: HttpAsyncClientExchangeHandler

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.

Specified by:

produceContent in interface HttpAsyncClientExchangeHandler

Parameters:

encoder - content encoder.

ioctrl - I/O control of the underlying connection.

Throws:

java.io.IOException - in case of an I/O error

requestCompleted

public void requestCompleted()

Description copied from interface: HttpAsyncClientExchangeHandler

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

Specified by:

requestCompleted in interface HttpAsyncClientExchangeHandler

responseReceived

public void responseReceived(HttpResponse response)
                      throws java.io.IOException,
                             HttpException

Description copied from interface: HttpAsyncClientExchangeHandler

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

Specified by:

responseReceived in interface HttpAsyncClientExchangeHandler

Parameters:

response - HTTP response message.

Throws:

java.io.IOException - in case of an I/O error

HttpException - in case of HTTP protocol violation

consumeContent

public void consumeContent(ContentDecoder decoder,
                           IOControl ioctrl)
                    throws java.io.IOException

Description copied from interface: HttpAsyncClientExchangeHandler

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.

Specified by:

consumeContent in interface HttpAsyncClientExchangeHandler

Parameters:

decoder - content decoder.

ioctrl - I/O control of the underlying connection.

Throws:

java.io.IOException - in case of an I/O error

responseCompleted

public void responseCompleted()
                       throws java.io.IOException

Description copied from interface: HttpAsyncClientExchangeHandler

Invoked to signal that the response has been fully processed.

Specified by:

responseCompleted in interface HttpAsyncClientExchangeHandler

Throws:

java.io.IOException

inputTerminated

public void inputTerminated()

Description copied from interface: HttpAsyncClientExchangeHandler

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

Specified by:

inputTerminated in interface HttpAsyncClientExchangeHandler

failed

public void failed(java.lang.Exception ex)

Description copied from interface: HttpAsyncClientExchangeHandler

Invoked to signal that the response processing terminated abnormally.

Specified by:

failed in interface HttpAsyncClientExchangeHandler

Parameters:

ex - exception

cancel

public boolean cancel()

Specified by:

cancel in interface Cancellable

isDone

public boolean isDone()

Description copied from interface: HttpAsyncClientExchangeHandler

Determines whether or not the response processing completed.

Specified by:

isDone in interface HttpAsyncClientExchangeHandler