Process for distributing an object-oriented program over a plurality of operating system processes of a computer system

• US 5,684,955 A
• Filed: 05/26/1994
• Issued: 11/04/1997
• Est. Priority Date: 09/20/1991
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Meyer, Walter, Rothe, Oliver, Hubmann, Hans-Jurgen, Bess, Rudiger, Kneissl, Franz
• Primary Examiner(s): Kriess, Kevin A.
• Assistant Examiner(s): Banankhah, Majid A.
• Application Number:
  US08/211,110
• Time in Patent Office: 1,258 Days
• Field of Search: 364/280, 364/280.4, 364/280.6, 364/281.3, 364/284, 364/284.3, 364/284.4, 364/286, 364/282.1, 395/650, 395/700, 395/280-281.3, 395/284-284.3, 395/200.03, 395/623, 395/684
• US Class Current: 719/316
• CPC Class Codes: G06F 9/449 Object-oriented method invocation or resolution
• CPC Class Codes: G06F 9/548 Object oriented; Remote method invocation [RMI] non-remote method invocation G06F9/449

Abstract

In an object-oriented application, a preparation process is used when compiling the sources of the application, a configuration process is used when link-editing, and a communication process is used during execution to call up methods for objects. No adaptation of sources is necessary when a system configuration is changed. This also applied to an extension of the object-oriented application.

Claims

1. A computer driven process for distributing an object-oriented application, which is written in a programming language whose communication mechanism is designed in such a way that only the addressing of objects within one computer-operating system is supported, over operating system processes that can be loaded and executed locally and remotely, the process comprising the steps of:

a) initiating a preparation process in which, for sources of the application to be compiled, at least one method call is replaced by a code sequence by;

substitution code by a preprocessor during compilation in accordance with a stub concept;

providing information as to whether an addressed object is currently located in the respective operating system process of the message sender at an instance that exists in every operating system process, or, if it exists in another every operating system process, providing route information to enable addressing, so that representative objects are present as stub objects instead of the real objects in the distributed application in operating system processes which do not themselves contain a real object;

b) distributing instances of the application with a configuration process for modules to be linked from compiled sources of the application as objects or stub objects over the operating system processes in accordance with a system configuration when link-editing the modules; and

c) calling up methods for objects of the application with a communication process provided during execution enabling a decision by using a local call of the stub method as to whether trans-process sending of a message is required or whether the call can be handled locally.

2. The computer-driven process of claim 1, with at least one of the following process steps of the preparation process:

d) analyzing a class declaration of the sources for allocating method identifications so that methods of used classes of the application are clearly identifiable by means of the method identification;

e) extending the classes of the application with a generic method by means of which the particular method identified by a parameter of the generic method in the form of the method identification can be called up locally during execution;

f) extending base classes of the application by a redefinably declared stub method;

g) replacing each of the calls of a method for an object of the classes provided during execution by a call of the stub method for the object provided during execution,

so that if a positive result of the call of the stub method for the object during execution, a call is provided for trans-process sending of a message, by means of which the call of the method of the object is initiated in a remote process, in that the message contains the method identification,

and also that the method of the object is called up if a negative result of the call of the stub method for the object during execution in the local process;

h) generating auxiliary definitions for methods so for each method of the application at least its class name, its method name, its parameter types, its parameter string for packing and unpacking parameters, and also its method identification are defined.

3. The computer driven process of claim 2 with at least one of the following process steps of the configuration process:

k) analyzing a particular system configuration of the application for distributing the objects as the instances of the application over the operating system processes of the application;

m) generating a generic instantiation function by means of which a new object of the application can be instantiated during execution,

with a local instantiation in the local process in the case of an object to be instantiated locally in accordance with the system configuration, so that the negative result is provided for said locally instantiated object when the stub method is called up in the local process,

and also with a remote instantiation in the case of an object to be instantiated remotely in accordance with the system configuration, in that a trans-process trigger is provided in the local process for instantiating said object to be instantiated remotely in the remote process, and also with a local instantiation for a local stub object provided for this object, the stub method of which is redefined in the local process, so that when the stub method is called up, the positive result is provided in the local process for this object locally instantiated as stub object;

n) generating a generic delete function by means of which the instantiation can be deleted by one of the objects of the application during execution,

with a local deletion in the local process for a locally instantiated object in accordance with the system configuration,

and also with a remote deletion for a remotely instantiated object in accordance with the system configuration, in that a trans-process trigger is provided in the local process for deleting said remotely instantiated object in the remote process, as well as a local deletion of the local stub object provided for said object; and

p) generating run files in that modules for the instantiation function, for the delete function, and also for the auxiliary definitions for the methods of the application are linked to the modules for each loadable unit.

4. The computer driven process of claim 3 with at least one of the following process steps of the communication process:

r) calling up the stub method for one of the objects locally and also making a local method call for the object for a negative result;

s) determining for a positive result for the local call of the stub method for the object the method identification, the remotely instantiated object, and also method parameters from the linked auxiliary definitions;

t) packing a message in the local process based on the parameter string;

u) receiving the message in the remote process,

v) determining the locally instantiated object in the remote process after unpacking the parameters and

w) executing the call of the method thereby identified by means of the generic method based on the method identification.