Dynamic replacement of software components

A computer program product, comprising:

• a non-transitory computer readable medium comprising code to perform the steps of:
• receiving, by a processor of a vestibule bank, an installation manager call for replacement of a component;
• routing, by the processor, the installation manager call from the vestibule bank to the component;
• draining, by the processor, one or more first user calls from a first queue of the component, and diverting the one or more first user calls to a replacement component via a private gate separate from the vestibule bank;
• queueing, by the processor, in a second queue different from the first queue, one or more second user calls for the component while the one or more first user calls are being drained from the component;
• and
• routing, by the processor, the one or more second user calls in the second queue via the private gate to the replacement component upon completion of draining the one or more first user calls from the component;
• wherein the vestibule bank provides a transition point into a protected subsystem, and comprises a collection of software units that collectively serve as a transition point into a protected system by routing incoming user calls, including routing the one or more first user calls and the one or more second user calls to the component and routing subsequent user calls to the replacement component.

An apparatus, comprising:

• a memory;
• and
• a processor coupled to the memory, the processor configured to execute the steps of:
• receiving, by the processor of a vestibule bank, an installation manager call for replacement of a component;
• routing, by the processor, the installation manager call from the vestibule bank to the component;
• draining, by the processor, one or more first user calls from a first queue of the component, and diverting the one or more first user calls to a replacement component via a private gate separate from the vestibule bank;
• queueing, by the processor, in a second queue different from the first queue, one or more second user calls for the component while the one or more first user calls are being drained from the component;
• and
• routing, by the processor, the one or more second user calls in the second queue via the private gate to the replacement component upon completion of draining the one or more first user calls from the component;
• wherein the vestibule bank provides a transition point into a protected subsystem, and comprises a collection of software units that collectively serve as a transition point into a protected system by routing incoming user calls including the one or more first user calls and the one or more second user calls to the component and routing subsequent user calls to the replacement component.