Package org.jcsp.lang

Class AltingConnectionServerImpl

All Implemented Interfaces:
ConnectionServer

public class AltingConnectionServerImpl extends AltingConnectionServer
This class does not need to be used by standard JCSP users. It is exposed so that the connection mechanism can be extended for custom connections.
Author:
Quickstone Technologies Limited
  • Field Details

    • SERVER_STATE_CLOSED

      protected static final int SERVER_STATE_CLOSED
      Server state. The server is initially CLOSED the first request will take it to the RECEIVED state. A reply will take it back to OPEN or CLOSED depending on the mode of reply. From the OPEN or CLOSED state a further request can occur.
      See Also:
    • SERVER_STATE_OPEN

      protected static final int SERVER_STATE_OPEN
      Server state. The server is initially CLOSED the first request will take it to the RECEIVED state. A reply will take it back to OPEN or CLOSED depending on the mode of reply. From the OPEN or CLOSED state a further request can occur.
      See Also:
    • SERVER_STATE_RECEIVED

      protected static final int SERVER_STATE_RECEIVED
      Server state. The server is initially CLOSED the first request will take it to the RECEIVED state. A reply will take it back to OPEN or CLOSED depending on the mode of reply. From the OPEN or CLOSED state a further request can occur.
      See Also:
  • Constructor Details

    • AltingConnectionServerImpl

      protected AltingConnectionServerImpl(AltingChannelInput openIn, AltingChannelInput furtherRequestIn)
      Constructs a new server instance. This must be called by a subclass which is responsible for creating the channels.
  • Method Details

    • request

      public Object request() throws IllegalStateException
      Receives some data from a client once a connection has been established. This will block until the client calls request(Object) but by establishing a connection.
      Returns:
      the Object sent by the client.
      Throws:
      IllegalStateException
    • reply

      public void reply(Object data) throws IllegalStateException
      Sends some data back to the client after a request has been received but keeps the connection open. After calling this method, the server should call recieve() to receive a further request.
      Parameters:
      data - the data to send to the client.
      Throws:
      IllegalStateException
    • reply

      public void reply(Object data, boolean close) throws IllegalStateException
      Sends some data back to the client after a request has been received. The closed parameter indicates whether or not the connection should be closed. The connection will be closed iff close is true.
      Parameters:
      data - the data to send to the client.
      close - boolean indicating whether or not the connection should be closed.
      Throws:
      IllegalStateException
    • replyAndClose

      public void replyAndClose(Object data) throws IllegalStateException
      Sends some data back to the client and closes the connection. This method will not block. After calling this method, the server may call accept() in order to allow another connection to this server to be established. If this method did not take any data to send back to the client, and the server was meant to call reply(Object) followed by a close(), then there would be a race hazard at the client as it would not know whether the connection had remained open or not.
      Parameters:
      data - the data to send back to client.
      Throws:
      IllegalStateException
    • getServerState

      protected int getServerState()