Method and apparatus for deferred throwing of exceptions in C++

A distributed object-based computing system arranged to process a request dispatched to a skeleton in a skeleton layer on a server of the computing system, the method comprising:

• an execution heap;
• a processor;
• a custom object associated with the request, the custom object being a module of application code which is inserted into the computing system;
• a mechanism for calling a custom pre-dispatch method which corresponds to the custom object, the custom pre-dispatch method being used to determine an appropriate servant to use to invoke a called method specified in the request;
• a selector for selecting an unmarshaling mechanism which corresponds to the request, wherein the unmarshaling mechanism is arranged to unmarshal at least a part of a marshal buffer into invocation arguments;
• a method invoker for invoking the called method in the servant which corresponds with the request using the invocation arguments;
• a mechanism for determining when an exception is raised during invocation of the called method;
• and
• a caller for calling a custom post-dispatch method which corresponds to the custom object, the custom post-dispatch method being arranged to process the exception when it is determined that the exception was raised during invocation of the called method, wherein the caller for calling the custom post-dispatch method processes a first copy of the exception that is arranged to be stored off of the execution heap and a runtime copy of the exception that is arranged to be stored on the execution heap when the exception is raised during invocation of the called method.

A computer program product for processing a request dispatched to a skeleton in a skeleton layer on a server of a distributed client/server based computing system comprising:

• computer code that constructs a custom object associated with the request, the custom object inserted into the distributed client/server based computing system;
• computer code that calls a custom pre-dispatch method which corresponds to the custom object, the custom pre-dispatch method being used to determine an appropriate servant to use to invoke a called method specified in the request;
• computer code that selects an unmarshaling mechanism which corresponds to the request;
• computer code that unmarshals at least a portion of a marshal buffer into invocation arguments using the selected unmarshaling mechanism;
• computer code that invokes the called method in the servant which corresponds with the request using the invocation arguments;
• computer code that determines when an exception is raised during invocation of the called method;
• computer code that calls a custom post-dispatch method which corresponds to the custom object, the custom post-dispatch method being used to process the exception when it is determined that the exception was raised during invocation of the called method, wherein the computer code that calls the custom post-dispatch method includes computer code that processes a first copy of the exception that is arranged to be stored off of an execution heap and a second copy of the exception that is arranged to be stored on the execution heap when the exception is raised during invocation of the called method;
• and
• a computer readable medium that stores the computer codes.