org.apache.http.nio.protocol
Interface HttpAsyncRequestConsumer<T>

Type Parameters:
T - the result type of request processing.
All Superinterfaces:
Closeable
All Known Implementing Classes:
AbstractAsyncRequestConsumer, BasicAsyncRequestConsumer

public interface HttpAsyncRequestConsumer<T>
extends Closeable

HttpAsyncRequestConsumer is a callback interface whose methods get invoked to process an HTTP request message and to stream message content from a non-blocking HTTP connection on the server side.

Since:
4.2

Method Summary
 void consumeContent(ContentDecoder decoder, IOControl ioctrl)
          Invoked to process a chunk of content from the ContentDecoder.
 void failed(Exception ex)
          Invoked to signal that the request processing terminated abnormally.
 Exception getException()
          Returns an exception in case of an abnormal termination.
 T getResult()
          Returns a result of the request execution, when available.
 boolean isDone()
          Determines whether or not the request execution completed.
 void requestCompleted(HttpContext context)
          Invoked to signal that the request has been fully processed.
 void requestReceived(HttpRequest request)
          Invoked when a HTTP request message is received.
 
Methods inherited from interface java.io.Closeable
close
 

Method Detail

requestReceived

void requestReceived(HttpRequest request)
                     throws HttpException,
                            IOException
Invoked when a HTTP request message is received. Please note that the consumeContent(ContentDecoder, IOControl) method will be invoked only for if the request message implements HttpEntityEnclosingRequest interface and has a content entity enclosed.

Parameters:
request - HTTP request message.
Throws:
HttpException - in case of HTTP protocol violation
IOException - in case of an I/O error

consumeContent

void consumeContent(ContentDecoder decoder,
                    IOControl ioctrl)
                    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.
ioctrl - I/O control of the underlying connection.
Throws:
IOException - in case of an I/O error

requestCompleted

void requestCompleted(HttpContext context)
Invoked to signal that the request has been fully processed.

Parameters:
context - HTTP context

failed

void failed(Exception ex)
Invoked to signal that the request processing terminated abnormally.

Parameters:
ex - exception

getException

Exception getException()
Returns an exception in case of an abnormal termination. This method returns null if the request execution is still ongoing or if it completed successfully.

See Also:
isDone()

getResult

T getResult()
Returns a result of the request execution, when available. This method returns null if the request execution is still ongoing.

See Also:
isDone()

isDone

boolean isDone()
Determines whether or not the request execution completed. If the request processing terminated normally getResult() can be used to obtain the result. If the request processing terminated abnormally getException() can be used to obtain the cause.



Copyright © 2005–2015 The Apache Software Foundation. All rights reserved.