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connections POAManager objects logically represent communications endpoints where objects listen for requests In some ORB implementations, POAManager objects encapsulate connections and perform network connection management When created, these POAManager implementations start listening for incoming requests, and when they are deactivated, they stop listening and close their connections
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1111 ORB Event Handling
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Any CORBA application that acts as a server must listen for and handle events such as incoming connections from clients and their subsequent requests With respect to event handling, server applications fall into one of two categories In some applications, only the ORB has the need to listen for and handle such events These applications can simply turn the main thread of control over to the ORB so that it can handle requests and dispatch them to its object adapters and servants Such applications are said to perform blocking event handling because the application main blocks until the ORB shuts down its event handling and returns control to main In other applications, the ORB is only one of several components that must perform event handling For example, a CORBA application with a graphical user interface (GUI) must allow the GUI to handle windowing events in addition to allowing the ORB to handle incoming requests These types of applications therefore perform non-blocking event handling They turn the main thread of control over to each of the various event-handling subsystems while not allowing any of them to block for significant periods of time Just as POAManager objects give you control over the request flow for your POAs, the ORB provides operations that allow you to control request flow and event handling for your whole application, including all object adapters[1] Following are the definitions of these operations
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[1] Although they are not strictly POA-specific, we cover ORB event-handling issues in this chapter because they, like the POA, relate to server applications
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#pragma prefix "omgorg" module CORBA { interface ORB { void run(); void shutdown(in boolean wait_for_completion); boolean work_pending(); void perform_work(); // }; // };
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These operations support both the blocking and the non-blocking varieties of eventhandling applications The run operation, which is blocking, causes the application to start listening for requests After an application is listening for requests, you can invoke shutdown to make it stop listening For non-blocking event handling, you use work_pending and perform_work We supply details of how each of these operations works in the following sections If the ORB did not provide such operations, applications would have to individually tell each POA or POAManager to listen for requests This in turn would mean that your application main would have to know about all POAs in your application and deal with all of them directly Instead, applications initiate event handling at the ORB level, and it delegates to each of its object adapters 11111 Blocking Event Handling The ORB::run operation blocks until the ORB has shut down By invoking run from the thread executing your application main, you permit the ORB to take over the main thread to perform its work The ORB keeps control of the main thread and does not return until after you invoke ORB::shutdown and the ORB completely shuts itself down Invoking run from any other thread merely blocks that thread by making it wait for ORB shutdown 11112 Non-Blocking Event Handling The ORB::run operation suffices for applications that operate correctly when the ORB takes over the main thread For applications that share the main thread with other event loops, however, yielding control of the main thread to the ORB is unacceptable Instead, such applications need a way to determine when the ORB requires the main thread to perform some work and then to temporarily hand over control of the main thread to the ORB to complete that work To determine whether the ORB has any work items pending, you call work_pending It returns true if the ORB needs the main thread to perform some work; otherwise, it returns false If work_pending returns true, you can temporarily give control of the main thread to the ORB by invoking perform_work
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// The handle_gui_events function allows the user // interface to refresh itself and handle its events // It returns true if the user has clicked the // "exit" button extern bool handle_gui_events(); int main(int argc, char * argv[]) { CORBA::ORB_var orb = CORBA::ORB_init(argc, argv); // Initialize POAs and POAManagers and then activate
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