@Immutable public class HttpAsyncService extends Object implements NHttpServerEventHandler
NHttpServerEventHandler
interface into logically related
HTTP message exchanges.
Upon receiving an incoming request HttpAsyncService verifies
the message for compliance with the server expectations using
HttpAsyncExpectationVerifier
, if provided, and then
HttpAsyncRequestHandlerResolver
is used to resolve the request URI
to a particular HttpAsyncRequestHandler
intended to handle
the request with the given URI. The protocol handler uses the selected
HttpAsyncRequestHandler
instance to process the incoming request
and to generate an outgoing response.
HttpAsyncService relies on HttpProcessor
to generate
mandatory protocol headers for all outgoing messages and apply common,
cross-cutting message transformations to all incoming and outgoing messages,
whereas individual HttpAsyncRequestHandler
s are expected
to implement application specific content generation and processing.
Individual HttpAsyncRequestHandler
s do not have to submit a response
immediately. They can defer transmission of an HTTP response back to
the client without blocking the I/O thread by delegating the process of
request handling to another service or a worker thread. HTTP response can
be submitted as a later a later point of time once response content becomes
available.
The following parameters can be used to customize the behavior of this
class:
Constructor and Description |
---|
HttpAsyncService(HttpProcessor httpProcessor,
ConnectionReuseStrategy connStrategy,
HttpAsyncRequestHandlerResolver handlerResolver,
HttpParams params)
Creates an instance of HttpAsyncServerProtocolHandler.
|
HttpAsyncService(HttpProcessor httpProcessor,
ConnectionReuseStrategy connStrategy,
HttpResponseFactory responseFactory,
HttpAsyncRequestHandlerResolver handlerResolver,
HttpAsyncExpectationVerifier expectationVerifier,
HttpParams params)
Creates an instance of HttpAsyncServerProtocolHandler.
|
Modifier and Type | Method and Description |
---|---|
void |
closed(NHttpServerConnection conn)
Triggered when the connection is closed.
|
void |
connected(NHttpServerConnection conn)
Triggered when a new incoming connection is created.
|
void |
endOfInput(NHttpServerConnection conn)
Triggered when the connection is closed by the opposite end point
(half-closed).
|
void |
exception(NHttpServerConnection conn,
Exception cause)
Triggered if an error occurs during the HTTP exchange.
|
protected HttpAsyncResponseProducer |
handleException(Exception ex,
HttpContext context) |
void |
inputReady(NHttpServerConnection conn,
ContentDecoder decoder)
Triggered when the underlying channel is ready for reading a
new portion of the request entity through the corresponding
content decoder.
|
protected void |
log(Exception ex)
This method can be used to log I/O exception thrown while closing
Closeable
objects (such as HttpConnection ). |
void |
outputReady(NHttpServerConnection conn,
ContentEncoder encoder)
Triggered when the underlying channel is ready for writing a
next portion of the response entity through the corresponding
content encoder.
|
void |
requestReceived(NHttpServerConnection conn)
Triggered when a new HTTP request is received.
|
void |
responseReady(NHttpServerConnection conn)
Triggered when the connection is ready to accept a new HTTP response.
|
void |
timeout(NHttpServerConnection conn)
Triggered when no input is detected on this connection over the
maximum period of inactivity.
|
public HttpAsyncService(HttpProcessor httpProcessor, ConnectionReuseStrategy connStrategy, HttpResponseFactory responseFactory, HttpAsyncRequestHandlerResolver handlerResolver, HttpAsyncExpectationVerifier expectationVerifier, HttpParams params)
httpProcessor
- HTTP protocol processor (required).connStrategy
- Connection re-use strategy (required).responseFactory
- HTTP response factory (required).handlerResolver
- Request handler resolver.expectationVerifier
- Request expectation verifier (optional).params
- HTTP parameters (required).public HttpAsyncService(HttpProcessor httpProcessor, ConnectionReuseStrategy connStrategy, HttpAsyncRequestHandlerResolver handlerResolver, HttpParams params)
httpProcessor
- HTTP protocol processor (required).connStrategy
- Connection re-use strategy (required).handlerResolver
- Request handler resolver.params
- HTTP parameters (required).public void connected(NHttpServerConnection conn)
NHttpServerEventHandler
connected
in interface NHttpServerEventHandler
conn
- new incoming connection HTTP connection.public void closed(NHttpServerConnection conn)
NHttpServerEventHandler
closed
in interface NHttpServerEventHandler
conn
- closed HTTP connection.public void exception(NHttpServerConnection conn, Exception cause)
NHttpServerEventHandler
exception
in interface NHttpServerEventHandler
conn
- HTTP connection that caused an I/O errorcause
- exceptionpublic void requestReceived(NHttpServerConnection conn) throws IOException, HttpException
NHttpServerEventHandler
NHttpServerEventHandler.inputReady(NHttpServerConnection, ContentDecoder)
calls
to transfer the request content.requestReceived
in interface NHttpServerEventHandler
conn
- HTTP connection that contains a new HTTP requestIOException
HttpException
NHttpServerConnection
public void inputReady(NHttpServerConnection conn, ContentDecoder decoder) throws IOException, HttpException
NHttpServerEventHandler
IOControl
interface (super interface of NHttpServerConnection
).
Please note that the NHttpServerConnection
and ContentDecoder
objects are 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 handler is capable of
processing more content.inputReady
in interface NHttpServerEventHandler
conn
- HTTP connection that can produce a new portion of the
incoming request content.decoder
- The content decoder to use to read content.IOException
HttpException
NHttpServerConnection
,
ContentDecoder
,
IOControl
public void responseReady(NHttpServerConnection conn) throws IOException, HttpException
NHttpServerEventHandler
responseReady
in interface NHttpServerEventHandler
conn
- HTTP connection that contains an HTTP responseIOException
HttpException
NHttpServerConnection
public void outputReady(NHttpServerConnection conn, ContentEncoder encoder) throws IOException
NHttpServerEventHandler
IOControl
interface (super interface of NHttpServerConnection
).
Please note that the NHttpServerConnection
and ContentEncoder
objects are 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.outputReady
in interface NHttpServerEventHandler
conn
- HTTP connection that can accommodate a new portion
of the outgoing response content.encoder
- The content encoder to use to write content.IOException
NHttpServerConnection
,
ContentEncoder
,
IOControl
public void endOfInput(NHttpServerConnection conn) throws IOException
NHttpServerEventHandler
endOfInput
in interface NHttpServerEventHandler
conn
- half-closed HTTP connection.IOException
public void timeout(NHttpServerConnection conn) throws IOException
NHttpServerEventHandler
timeout
in interface NHttpServerEventHandler
conn
- HTTP connection that caused timeout condition.IOException
protected void log(Exception ex)
Closeable
objects (such as HttpConnection
).ex
- I/O exception thrown by Closeable.close()
protected HttpAsyncResponseProducer handleException(Exception ex, HttpContext context)
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