Partial migration of applications to the cloud

A computer-implemented method comprising:

• partially migrating to a cloud environment an application configured for execution on a mainframe system, the application comprising a first object that is configured to call a second object of the application as part of transaction execution, the partially migrating comprising:
• migrating the second object to the cloud environment for execution thereon;
• providing in the mainframe system a facade component that receives from the first object the call to the second object;
• and
• providing a proxy component exposing an application programming interface (API) for calling by the facade component, the proxy component providing a call for provision to the second object on the cloud environment.

A computer-implemented method comprising:

• partially migrating to a cloud environment a transaction flow configured for execution on a mainframe system, the transaction flow comprising a sequence of actions performed by execution of a plurality of objects, the plurality of objects comprising a first object configured to call a second object as part of the transaction flow, the partially migrating comprising:
• migrating the first object to the cloud environment for execution thereon as part of the transaction flow;
• and
• providing in the cloud environment a façade component that receives from the first object the call to the second object, and calls to the second object through a mainframe gateway to invoke execution of the second object on the mainframe system.