Performing API services using zone-based topics within a pub/sub messaging infrastructure

A computer program product, comprising:

• one or more computer readable hardware storage devices having computer readable program code stored therein, said program code containing instructions executable by one or more processors of a computer system to implement a method for performing an Application Programming Interface (API) service using zone-based topics within a publish/subscribe (pub/sub) messaging infrastructure, said method comprising:
• receiving, by the one or more processors, an API service request sent by a client entity, said API service request specifying the API service to be fulfilled;
• receiving, by the one or more processors, a selection of an API service endpoint, wherein the API service endpoint is configured to execute the API service;
• receiving, by the one or more processors, a selection of an API service invocation model supported by the selected API service endpoint, wherein
• the API service invocation model is one of a synchronous invocation model or an asynchronous invocation model, with respect to interactions between the API service endpoint and workers;
• posting, by the one or more processors, messages to respective pub/sub zone-based topics of a sequence of zone-based topics, based on the selected API service invocation model;
• selecting, by the one or more processors, the workers who are subscribed to the respective pub/sub zone-based topics, each zone-based topic of the sequence of zone-based topics comprising one or more tasks to be performed in a specified one or more zones;
• and
• implementing, by the one or more processors, for each zone-based topic of the sequence of zone-based topics, the one or more tasks, wherein
• said implementing of the one or more tasks is performed by executing a corresponding worker of the selected workers, selected for the zone-based topic,
• said implementing of the one or more tasks is in accordance with the selected API service invocation model,
• one or more tasks of the zone-based topics include invoking the API service endpoint for the API service and making a fulfillment result of the API service available to the client entity, and
• the invoking of the API service endpoint is in accordance with the selected API service invocation model.

A computer system, comprising:

• one or more processors;
• one or more memories;
• and
• one or more computer readable hardware storage devices, said one or more computer readable hardware storage devices containing program code executable by the one or more processors via the one or more memories to implement a method for performing an Application Programming Interface (API) service using zone-based topics within a publish/subscribe (pub/sub) messaging infrastructure, said method comprising:
• receiving, by the one or more processors, an API service request sent by a client entity, said API service request specifying the API service to be fulfilled;
• receiving, by the one or more processors, a selection of an API service endpoint, wherein the API service endpoint is configured to execute the API service;
• receiving, by the one or more processors, a selection of an API service invocation model supported by the selected API service endpoint, wherein
• the API service invocation model is one of a synchronous invocation model or an asynchronous invocation model, with respect to interactions between the API service endpoint and workers;
• posting, by the one or more processors, messages to respective pub/sub zone-based topics of a sequence of zone-based topics, based on the selected API service invocation model;
• selecting, by the one or more processors, the workers who are subscribed to the respective pub/sub zone-based topics, each zone-based topic of the sequence of zone-based topics comprising one or more tasks to be performed in a specified one or more zones;
• and
• implementing, by the one or more processors, for each zone-based topic of the sequence of zone-based topics, the one or more tasks, wherein
• said implementing of the one or more tasks is performed by executing a corresponding worker of the selected workers, selected for the zone-based topic,
• said implementing of the one or more tasks is in accordance with the selected API service invocation model,
• the one or more tasks of the zone-based topics include invoking the API service endpoint for the API service and making a fulfillment result of the API service available to the client entity, and
• the invoking of the API service endpoint is in accordance with the selected API service invocation model.