org.apache.http.nio.protocol

Class AbstractAsyncRequestConsumer<T>

java.lang.Object

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

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, HttpAsyncRequestConsumer<T>

Direct Known Subclasses:

BasicAsyncRequestConsumer

public abstract class AbstractAsyncRequestConsumer<T>
extends java.lang.Object
implements HttpAsyncRequestConsumer<T>

Abstract HttpAsyncRequestConsumer 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

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.concurrent.atomic.AtomicBoolean	completed
private java.lang.Exception	ex
private T	result

Constructor Summary

Constructors

Constructor and Description
AbstractAsyncRequestConsumer()

Method Summary

Modifier and Type	Method and Description
protected abstract T	buildResult(HttpContext context) Invoked to generate a result object from the received HTTP request message.
void	close()
void	consumeContent(ContentDecoder decoder, IOControl ioctrl) Use onContentReceived(ContentDecoder, IOControl) instead.
void	failed(java.lang.Exception ex) Invoked to signal that the request processing terminated abnormally.
java.lang.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.
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 request message encloses a content entity.
protected abstract void	onRequestReceived(HttpRequest request) Invoked when a HTTP request message is received.
protected abstract void	releaseResources() Invoked to release all system resources currently allocated.
void	requestCompleted(HttpContext context) Use buildResult(HttpContext) instead.
void	requestReceived(HttpRequest request) Use onRequestReceived(HttpRequest) instead.

Methods inherited from class java.lang.Object

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

Field Detail

completed

private final java.util.concurrent.atomic.AtomicBoolean completed

result

private volatile T result

ex

private volatile java.lang.Exception ex

Constructor Detail

AbstractAsyncRequestConsumer

public AbstractAsyncRequestConsumer()

Method Detail

onRequestReceived

protected abstract void onRequestReceived(HttpRequest request)
                                   throws HttpException,
                                          java.io.IOException

Invoked when a HTTP request message is received. Please note that the onContentReceived(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

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

onEntityEnclosed

protected abstract void onEntityEnclosed(HttpEntity entity,
                                         ContentType contentType)
                                  throws java.io.IOException

Invoked if the request message encloses a content entity.

Parameters:

entity - HTTP entity

contentType - expected content type.

Throws:

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

onContentReceived

protected abstract void onContentReceived(ContentDecoder decoder,
                                          IOControl ioctrl)
                                   throws java.io.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:

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

buildResult

protected abstract T buildResult(HttpContext context)
                          throws java.lang.Exception

Invoked to generate a result object from the received HTTP request message.

Parameters:

context - HTTP context.

Returns:

result of the request processing.

Throws:

java.lang.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 java.io.IOException

Invoked when the consumer is being closed.

Throws:

java.io.IOException - may be thrown by subclassses

Since:

4.3

requestReceived

public final void requestReceived(HttpRequest request)
                           throws HttpException,
                                  java.io.IOException

Use onRequestReceived(HttpRequest) instead.

Specified by:

requestReceived in interface HttpAsyncRequestConsumer<T>

Parameters:

request - HTTP request message.

Throws:

HttpException - in case of HTTP protocol violation

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

consumeContent

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

Use onContentReceived(ContentDecoder, IOControl) instead.

Specified by:

consumeContent in interface HttpAsyncRequestConsumer<T>

Parameters:

decoder - content decoder.

ioctrl - I/O control of the underlying connection.

Throws:

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

requestCompleted

public final void requestCompleted(HttpContext context)

Use buildResult(HttpContext) instead.

Specified by:

requestCompleted in interface HttpAsyncRequestConsumer<T>

Parameters:

context - HTTP context

failed

public final void failed(java.lang.Exception ex)

Description copied from interface: HttpAsyncRequestConsumer

Invoked to signal that the request processing terminated abnormally.

Specified by:

failed in interface HttpAsyncRequestConsumer<T>

Parameters:

ex - exception

close

public final void close()
                 throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Throws:

java.io.IOException

getException

public java.lang.Exception getException()

Description copied from interface: HttpAsyncRequestConsumer

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.

Specified by:

getException in interface HttpAsyncRequestConsumer<T>

See Also:

HttpAsyncRequestConsumer.isDone()

getResult

public T getResult()

Description copied from interface: HttpAsyncRequestConsumer

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

Specified by:

getResult in interface HttpAsyncRequestConsumer<T>

See Also:

HttpAsyncRequestConsumer.isDone()

isDone

public boolean isDone()

Description copied from interface: HttpAsyncRequestConsumer

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

Specified by:

isDone in interface HttpAsyncRequestConsumer<T>