Class ThrottlingHttpClientHandler

  • All Implemented Interfaces:
    NHttpClientHandler

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

    Since:
    4.0
    • Field Detail

      • executor

        protected final java.util.concurrent.Executor executor
        Deprecated.
    • Constructor Detail

      • ThrottlingHttpClientHandler

        public ThrottlingHttpClientHandler​(org.apache.http.protocol.HttpProcessor httpProcessor,
                                           HttpRequestExecutionHandler execHandler,
                                           org.apache.http.ConnectionReuseStrategy connStrategy,
                                           ByteBufferAllocator allocator,
                                           java.util.concurrent.Executor executor,
                                           org.apache.http.params.HttpParams params)
        Deprecated.
      • ThrottlingHttpClientHandler

        public ThrottlingHttpClientHandler​(org.apache.http.protocol.HttpProcessor httpProcessor,
                                           HttpRequestExecutionHandler execHandler,
                                           org.apache.http.ConnectionReuseStrategy connStrategy,
                                           java.util.concurrent.Executor executor,
                                           org.apache.http.params.HttpParams params)
        Deprecated.
    • Method Detail

      • connected

        public void connected​(NHttpClientConnection conn,
                              java.lang.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
      • exception

        public void exception​(NHttpClientConnection conn,
                              org.apache.http.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,
                              java.io.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
      • 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.