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public interface HttpAsyncClientExchangeHandler
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.
HttpAsyncClientExchangeHandler
s can delegate implementation
of application specific content generation and processing to
a HttpAsyncRequestProducer
and a HttpAsyncResponseConsumer
.
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 |
---|
HttpRequest generateRequest() throws IOException, HttpException
HttpEntityEnclosingRequest
interface if it is
to enclose a content entity. The produceContent(ContentEncoder,
IOControl)
method will not be invoked if
HttpEntityEnclosingRequest.getEntity()
returns
null
.
HttpException
- in case of HTTP protocol violation
IOException
- in case of an I/O errorvoid produceContent(ContentEncoder encoder, IOControl ioControl) throws IOException
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.
encoder
- content encoder.ioControl
- I/O control of the underlying connection.
IOException
- in case of an I/O errorvoid requestCompleted()
void responseReceived(HttpResponse response) throws IOException, HttpException
consumeContent(ContentDecoder, IOControl)
method
will be invoked only if the response messages has a content entity
enclosed.
response
- HTTP response message.
HttpException
- in case of HTTP protocol violation
IOException
- in case of an I/O errorvoid consumeContent(ContentDecoder decoder, IOControl ioControl) throws IOException
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.
decoder
- content decoder.ioControl
- I/O control of the underlying connection.
IOException
- in case of an I/O errorvoid responseCompleted() throws IOException, HttpException
IOException
HttpException
void inputTerminated()
void failed(Exception ex)
ex
- exceptionboolean isDone()
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