org.apache.http.nio.protocol
Class AbstractAsyncResponseConsumer<T>

java.lang.Object
  extended by org.apache.http.nio.protocol.AbstractAsyncResponseConsumer<T>
All Implemented Interfaces:
Closeable, Cancellable, HttpAsyncResponseConsumer<T>
Direct Known Subclasses:
BasicAsyncResponseConsumer

public abstract class AbstractAsyncResponseConsumer<T>
extends Object
implements HttpAsyncResponseConsumer<T>

Abstract HttpAsyncResponseConsumer implementation that relieves its subclasses from having to manage internal state and provides a number of protected event methods that they need to implement.

Since:
4.2

Constructor Summary
AbstractAsyncResponseConsumer()
           
 
Method Summary
protected abstract  T buildResult(HttpContext context)
          Invoked to generate a result object from the received HTTP response message.
 boolean cancel()
           
 void close()
           
 void consumeContent(ContentDecoder decoder, IOControl ioctrl)
          Use onContentReceived(ContentDecoder, IOControl) instead.
 void failed(Exception ex)
          Invoked to signal that the response processing terminated abnormally.
 Exception getException()
          Returns an exception in case of an abnormal termination.
 T getResult()
          Returns a result of the response processing, when available.
 boolean isDone()
          Determines whether or not the response processing completed.
protected  void onClose()
          Invoked when the consumer is being closed.
protected abstract  void onContentReceived(ContentDecoder decoder, IOControl ioctrl)
          Invoked to process a chunk of content from the ContentDecoder.
protected abstract  void onEntityEnclosed(HttpEntity entity, ContentType contentType)
          Invoked if the response message encloses a content entity.
protected abstract  void onResponseReceived(HttpResponse response)
          Invoked when a HTTP response message is received.
protected abstract  void releaseResources()
          Invoked to release all system resources currently allocated.
 void responseCompleted(HttpContext context)
          Use buildResult(HttpContext) instead.
 void responseReceived(HttpResponse response)
          Use onResponseReceived(HttpResponse) instead.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

AbstractAsyncResponseConsumer

public AbstractAsyncResponseConsumer()
Method Detail

onResponseReceived

protected abstract void onResponseReceived(HttpResponse response)
                                    throws HttpException,
                                           IOException
Invoked when a HTTP response message is received. Please note that the onContentReceived(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

onContentReceived

protected abstract void onContentReceived(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 events if the consumer is temporarily unable to consume more content.

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

Parameters:
decoder - content decoder.
ioctrl - I/O control of the underlying connection.
Throws:
IOException - in case of an I/O error

onEntityEnclosed

protected abstract void onEntityEnclosed(HttpEntity entity,
                                         ContentType contentType)
                                  throws IOException
Invoked if the response message encloses a content entity.

Parameters:
entity - HTTP entity
contentType - expected content type.
Throws:
IOException - in case of an I/O error

buildResult

protected abstract T buildResult(HttpContext context)
                          throws Exception
Invoked to generate a result object from the received HTTP response message.

Parameters:
context - HTTP context.
Returns:
result of the response processing.
Throws:
Exception - in case of an abnormal termination.

releaseResources

protected abstract void releaseResources()
Invoked to release all system resources currently allocated.


onClose

protected void onClose()
                throws IOException
Invoked when the consumer is being closed.

Throws:
IOException - may be thrown by subclassses
Since:
4.3

responseReceived

public final void responseReceived(HttpResponse response)
                            throws IOException,
                                   HttpException
Use onResponseReceived(HttpResponse) instead.

Specified by:
responseReceived in interface HttpAsyncResponseConsumer<T>
Parameters:
response - HTTP response message.
Throws:
IOException - in case of an I/O error
HttpException - in case of HTTP protocol violation

consumeContent

public final void consumeContent(ContentDecoder decoder,
                                 IOControl ioctrl)
                          throws IOException
Use onContentReceived(ContentDecoder, IOControl) instead.

Specified by:
consumeContent in interface HttpAsyncResponseConsumer<T>
Parameters:
decoder - content decoder.
ioctrl - I/O control of the underlying connection.
Throws:
IOException - in case of an I/O error

responseCompleted

public final void responseCompleted(HttpContext context)
Use buildResult(HttpContext) instead.

Specified by:
responseCompleted in interface HttpAsyncResponseConsumer<T>
Parameters:
context - HTTP context

cancel

public final boolean cancel()
Specified by:
cancel in interface Cancellable

failed

public final void failed(Exception ex)
Description copied from interface: HttpAsyncResponseConsumer
Invoked to signal that the response processing terminated abnormally.

Specified by:
failed in interface HttpAsyncResponseConsumer<T>
Parameters:
ex - exception

close

public final void close()
                 throws IOException
Specified by:
close in interface Closeable
Throws:
IOException

getException

public Exception getException()
Description copied from interface: HttpAsyncResponseConsumer
Returns an exception in case of an abnormal termination. This method returns null if the response processing is still ongoing or if it completed successfully.

Specified by:
getException in interface HttpAsyncResponseConsumer<T>
See Also:
HttpAsyncResponseConsumer.isDone()

getResult

public T getResult()
Description copied from interface: HttpAsyncResponseConsumer
Returns a result of the response processing, when available. This method returns null if the response processing is still ongoing.

Specified by:
getResult in interface HttpAsyncResponseConsumer<T>
See Also:
HttpAsyncResponseConsumer.isDone()

isDone

public boolean isDone()
Description copied from interface: HttpAsyncResponseConsumer
Determines whether or not the response processing completed. If the response processing terminated normally HttpAsyncResponseConsumer.getResult() can be used to obtain the result. If the response processing terminated abnormally HttpAsyncResponseConsumer.getException() can be used to obtain the cause.

Specified by:
isDone in interface HttpAsyncResponseConsumer<T>


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