Legacy application decommissioning framework
A legacy application decommissioner provides developers a tool to decommission and migrate legacy application functionality in a phased approach. The decommissioner identifies core web services that invoke legacy applications through an accessibility layer that monitors operator interaction with the application. The decommissioner then defines, creates, and deploys a web service that provides control over the operation of the legacy application. As a result, the functionality of the legacy application may be migrated to a new platform and architecture and the legacy application decommissioned so that organizations may continue to realize a return on their significant investment in the creation of the legacy application.
1. A method for decommissioning a legacy application, the method comprising:
implementing a core web service that invokes legacy application logic implemented in a legacy application, the core web service comprising:
a core web service identifier; and
legacy application invocation logic operable to invoke the legacy application logic;
identifying decommissioning replacement logic for a first part of the legacy application logic;
establishing a decommissioning framework for the legacy application by:
building a partially transitioned web service wrapper that comprises the core web service identifier and that invokes a combination of a second part of the legacy application logic and new application logic implemented in a new application;
inserting the identified decommissioning replacement logic into the partially transitioned web service wrapper, the decommissioning replacement logic invoking new application logic implemented in the new application, and
inserting legacy application invocation logic into the partially transitioned web service wrapper, the legacy application invocation logic invoking the second part of the legacy application logic;
replacing the core web service with the partially transitioned web service wrapper included in the decommissioning framework;
identifying additional decommissioning replacement logic for the second part of the legacy application logic; and
building, in the decommissioning framework and using the additional decommissioning replacement logic, a fully transitioned web service wrapper that invokes new application logic implemented in the new application, but does not invoke the legacy application logic.
2. The method of claim 1 , where the web service wrapper is one of multiple web service wrappers in the decommissioning framework, each comprising different decommissioning replacement logic for different legacy application logic in the legacy application.
3. The method of claim 2 , further comprising:
evaluating the decommissioning framework to determine a degree of coverage of desired functionality originally provided by the legacy application that is also provided by the decommissioning framework.
4. The method of claim 3 , further comprising:
comparing the degree of coverage against a decommissioning threshold; and issuing a decommissioning request to deactivate the legacy application when the degree of coverage exceeds the decommissioning threshold.
5. The method of claim 1 , where inserting comprises:
inserting an invocation of a replacement web service that replaces the legacy application logic.
6. The method of claim 1 , where inserting comprises:
inserting in-line executable logic that replaces the legacy application logic.
7. The method of claim 1 , where establishing a decommissioning framework further comprises:
adding a wrapper exception handler to the decommissioning framework.
8. A method for decommissioning a legacy application, the method comprising:
determining a core web service identifier of a pre-existing web service for invoking legacy application logic;
identifying decommissioning replacement logic for a first part of the legacy application logic;
establishing a decommissioning framework for the legacy application by:
building a partially transitioned web service wrapper that comprises the core web service identifier and that invokes a combination of a second part of the legacy application logic and new application logic implemented in a new application;
inserting the identified decommissioning replacement logic into the partially transitioned web service wrapper, the decommissioning replacement logic invoking new application logic implemented in the new application, and
inserting legacy application invocation logic into the partially transitioned web service wrapper, the legacy application invocation logic invoking the second part of the legacy application logic;
replacing the core web service with the partially transitioned web service wrapper included in the decommissioning framework;
identifying additional decommissioning replacement logic for the second part of the legacy application logic; and
building, in the decommissioning framework and using the additional decommissioning replacement logic, a fully transitioned web service wrapper that invokes new application logic implemented in the new application, but does not invoke the legacy application logic.
9. The method of claim 8 , where the web service wrapper is one of multiple web service wrappers in the decommissioning framework, each comprising different decommissioning replacement logic for different legacy application logic in the legacy application.
10. The method of claim 9 , further comprising:
evaluating the decommissioning framework to determine a degree of coverage of desired functionality originally provided by the legacy application that is also provided by the decommissioning framework.
11. The method of claim 10 , further comprising:
comparing the degree of coverage against a decommissioning threshold; and
issuing a decommissioning request to deactivate the legacy application when the degree of coverage exceeds the decommissioning threshold.
12. The method of claim 9 , where inserting comprises:
inserting an invocation of a replacement web service that replaces the legacy application logic.
13. The method of claim 9 , where establishing comprises:
establishing a decommissioning web service.
14. A computer system comprising:
at least one processing device; and
at least one computer-readable medium having computer-executable instructions that when executed, by the at least one processing device, cause the at least one processing device to perform operations comprising:
determining a core web service identifier of a pre-existing web service for invoking legacy application logic;
identifying decommissioning replacement logic for a first part of the legacy application logic;
establishing a decommissioning framework for the legacy application by:
building a partially transitioned web service wrapper that comprises the core web service identifier and that invokes a combination of a second part of the legacy application logic and new application logic implemented in a new application;
inserting the identified decommissioning replacement logic into the partially transitioned web service wrapper, the decommissioning replacement logic invoking new application logic implemented in the new application, and
inserting legacy application invocation logic into the partially transitioned web service wrapper, the legacy application invocation logic invoking the second part of the legacy application logic;
replacing the core web service with the partially transitioned web service wrapper included in the decommissioning framework;
identifying additional decommissioning replacement logic for the second part of the legacy application logic; and
building, in the decommissioning framework and using the additional decommissioning replacement logic, a fully transitioned web service wrapper that invokes new application logic implemented in the new application, but does not invoke the legacy application logic.
15. The system of claim 14 , where the web service wrapper is one of multiple web service wrappers in the decommissioning framework, each comprising different decommissioning replacement logic for different legacy application logic in the legacy application.
16. The system of claim 15 , wherein the operations further comprise:
evaluating the decommissioning framework to determine a degree of coverage of desired functionality originally provided by the legacy application that is also provided by the decommissioning framework.
17. The system of claim 16 , wherein the operations further comprise:
comparing the degree of coverage against a decommissioning threshold; and
issuing a decommissioning request to deactivate the legacy application when the degree of coverage exceeds the decommissioning threshold.
18. The system of claim 15 , where inserting comprises:
inserting an invocation of a replacement web service that replaces the legacy application logic.
19. The method of claim 15 , where establishing comprises:
establishing a decommissioning web service.
20. The system of claim 14 , where establishing a decommissioning framework further comprises:
adding a wrapper exception handler to the decommissioning framework.