org.apache.http.nio.protocol

Class ThrottlingHttpClientHandler

java.lang.Object

org.apache.http.nio.protocol.NHttpHandlerBase

org.apache.http.nio.protocol.ThrottlingHttpClientHandler

All Implemented Interfaces:

NHttpClientHandler

Deprecated.

(4.2) use HttpAsyncRequestExecutor and HttpAsyncRequester

@Deprecated
 @Contract(threading=SAFE_CONDITIONAL)
public class ThrottlingHttpClientHandler
extends NHttpHandlerBase
implements NHttpClientHandler

Client protocol handler implementation that provide compatibility with the blocking I/O by utilizing shared content buffers and a fairly small pool of worker threads. The throttling protocol handler allocates input / output buffers of a constant length upon initialization and controls the rate of I/O events in order to ensure those content buffers do not ever get overflown. This helps ensure nearly constant memory footprint for HTTP connections and avoid the out of memory condition while streaming content in and out. The HttpRequestExecutionHandler.handleResponse(HttpResponse, HttpContext) method will fire immediately when a message is received. The protocol handler delegate the task of processing requests and generating response content to an Executor, which is expected to perform those tasks using dedicated worker threads in order to avoid blocking the I/O thread.

Usually throttling protocol handlers need only a modest number of worker threads, much fewer than the number of concurrent connections. If the length of the message is smaller or about the size of the shared content buffer worker thread will just store content in the buffer and terminate almost immediately without blocking. The I/O dispatch thread in its turn will take care of sending out the buffered content asynchronously. The worker thread will have to block only when processing large messages and the shared buffer fills up. It is generally advisable to allocate shared buffers of a size of an average content body for optimal performance.

The following parameters can be used to customize the behavior of this class:

• NIOReactorPNames.CONTENT_BUFFER_SIZE
• CoreProtocolPNames.WAIT_FOR_CONTINUE

Since:

4.0

Constructor Summary

Constructors

Constructor and Description
ThrottlingHttpClientHandler(HttpProcessor httpProcessor, HttpRequestExecutionHandler execHandler, ConnectionReuseStrategy connStrategy, ByteBufferAllocator allocator, Executor executor, HttpParams params) Deprecated.
ThrottlingHttpClientHandler(HttpProcessor httpProcessor, HttpRequestExecutionHandler execHandler, ConnectionReuseStrategy connStrategy, Executor executor, HttpParams params) Deprecated.

Method Summary

Modifier and Type	Method and Description
void	closed(NHttpClientConnection conn) Deprecated. Triggered when the connection is closed.
void	connected(NHttpClientConnection conn, Object attachment) Deprecated. Triggered when a new outgoing connection is created.
void	exception(NHttpClientConnection conn, HttpException ex) Deprecated. Triggered when an HTTP protocol violation occurs while receiving an HTTP response.
void	exception(NHttpClientConnection conn, IOException ex) Deprecated. Triggered when an I/O error occurs while reading from or writing to the underlying channel.
void	inputReady(NHttpClientConnection conn, ContentDecoder decoder) Deprecated. Triggered when the underlying channel is ready for reading a new portion of the response entity through the corresponding content decoder.
void	outputReady(NHttpClientConnection conn, ContentEncoder encoder) Deprecated. Triggered when the underlying channel is ready for writing a next portion of the request entity through the corresponding content encoder.
void	requestReady(NHttpClientConnection conn) Deprecated. Triggered when the connection is ready to accept a new HTTP request.
void	responseReceived(NHttpClientConnection conn) Deprecated. Triggered when an HTTP response is received.
void	timeout(NHttpClientConnection conn) Deprecated. Triggered when no input is detected on this connection over the maximum period of inactivity.

Methods inherited from class org.apache.http.nio.protocol.NHttpHandlerBase

getParams, setEventListener

Methods inherited from class java.lang.Object

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

Constructor Detail

ThrottlingHttpClientHandler

public ThrottlingHttpClientHandler(HttpProcessor httpProcessor,
                                   HttpRequestExecutionHandler execHandler,
                                   ConnectionReuseStrategy connStrategy,
                                   ByteBufferAllocator allocator,
                                   Executor executor,
                                   HttpParams params)

Deprecated.

ThrottlingHttpClientHandler

public ThrottlingHttpClientHandler(HttpProcessor httpProcessor,
                                   HttpRequestExecutionHandler execHandler,
                                   ConnectionReuseStrategy connStrategy,
                                   Executor executor,
                                   HttpParams params)

Deprecated.

Method Detail

connected

public void connected(NHttpClientConnection conn,
                      Object attachment)

Deprecated.

Description copied from interface: NHttpClientHandler

Triggered when a new outgoing connection is created.

Specified by:

connected in interface NHttpClientHandler

Parameters:

conn - new outgoing HTTP connection.

attachment - an object that was attached to the session request

closed

public void closed(NHttpClientConnection conn)

Deprecated.

Description copied from interface: NHttpClientHandler

Triggered when the connection is closed.

Specified by:

closed in interface NHttpClientHandler

Parameters:

conn - closed HTTP connection.

exception

public void exception(NHttpClientConnection conn,
                      HttpException ex)

Deprecated.

Description copied from interface: NHttpClientHandler

Triggered when an HTTP protocol violation occurs while receiving an HTTP response.

Specified by:

exception in interface NHttpClientHandler

Parameters:

conn - HTTP connection that caused an HTTP protocol violation

ex - HTTP protocol violation exception

exception

public void exception(NHttpClientConnection conn,
                      IOException ex)

Deprecated.

Description copied from interface: NHttpClientHandler

Triggered when an I/O error occurs while reading from or writing to the underlying channel.

Specified by:

exception in interface NHttpClientHandler

Parameters:

conn - HTTP connection that caused an I/O error

ex - I/O exception

requestReady

public void requestReady(NHttpClientConnection conn)

Deprecated.

Description copied from interface: NHttpClientHandler

Triggered when the connection is ready to accept a new HTTP request. The protocol handler does not have to submit a request if it is not ready.

Specified by:

requestReady in interface NHttpClientHandler

Parameters:

conn - HTTP connection that is ready to accept a new HTTP request.

See Also:

NHttpClientConnection

outputReady

public void outputReady(NHttpClientConnection conn,
                        ContentEncoder encoder)

Deprecated.

Description copied from interface: NHttpClientHandler

Triggered when the underlying channel is ready for writing a next portion of the request entity through the corresponding content encoder.

If the content producer is unable to generate the outgoing content, output event notifications can be temporarily suspended using IOControl interface.

Specified by:

outputReady in interface NHttpClientHandler

Parameters:

conn - HTTP connection that can accommodate a new portion of the outgoing request content.

encoder - The content encoder to use to write content.

See Also:

NHttpClientConnection, ContentEncoder, IOControl

responseReceived

public void responseReceived(NHttpClientConnection conn)

Deprecated.

Description copied from interface: NHttpClientHandler

Triggered when an HTTP response is received. The connection passed as a parameter to this method is guaranteed to return a valid HTTP response object.

If the response received encloses a response entity this method will be followed by a series of NHttpClientHandler.inputReady(NHttpClientConnection, ContentDecoder) calls to transfer the response content.

Specified by:

responseReceived in interface NHttpClientHandler

Parameters:

conn - HTTP connection that contains an HTTP response

See Also:

NHttpClientConnection

inputReady

public void inputReady(NHttpClientConnection conn,
                       ContentDecoder decoder)

Deprecated.

Description copied from interface: NHttpClientHandler

Triggered when the underlying channel is ready for reading a new portion of the response entity through the corresponding content decoder.

If the content consumer is unable to process the incoming content, input event notifications can be temporarily suspended using IOControl interface.

Specified by:

inputReady in interface NHttpClientHandler

Parameters:

conn - HTTP connection that can produce a new portion of the incoming response content.

decoder - The content decoder to use to read content.

See Also:

NHttpClientConnection, ContentDecoder, IOControl

timeout

public void timeout(NHttpClientConnection conn)

Deprecated.

Description copied from interface: NHttpClientHandler

Triggered when no input is detected on this connection over the maximum period of inactivity.

Specified by:

timeout in interface NHttpClientHandler

Parameters:

conn - HTTP connection that caused timeout condition.