As of CA Gen 8 the CICS Socket Listener is the preferred CICS TCP/IP connection mechanism. This version supports a non persistent socket which means a new socket connection is created for each client/server request/response. As of CA Gen 8 all supported client side runtimes have been modified to allow support for this non persistent behavior.
If this listener is used with the Client Manager, the server configuration details must be set with the CICS Socket Listener check box selected as mentioned in the Details for Configuring TCP/IP (Sockets) section above.
The CICS Socket Listener implementation uses the CICS program TISRVLIS. TISRVLIS listens for connection requests from the Client Manager using its well-known port address. When a request is accepted TISRVLIS passes the connection request to the appropriate CA Gen application server. The CA Gen application server then assumes responsibility for creating, managing, and closing the socket connection.
When DPS application processing is complete, a response message is passed from the server application to the Client Manager and on to the DPC application.
The following diagram illustrates a Distributed Process application prior to a DPC request being serviced by the target server environment TISRVLIS process. The Client Manager initiates a bind socket request to the TISRVLIS process's well-known port address.
The following diagram illustrates a Distributed Process application at the time the Client Manager request has been accepted and the application server process has taken responsibility for the connection. The TISRVLIS process is now available to listen for additional connections from the Client Manager.
The following diagram illustrates a Distributed Process application after the server application has completed. The socket connection used for the transaction has been closed. The TISRVLIS process is handling another connection request from the Client Manager and the cycle repeats.
Note: Installation and configuration information for the TISRVLIS component appears in the Host Encyclopedia and Host Construction Installation Guide and in the z/OS Implementation Toolset Installation Guide.
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