Communication and coordination between web services in a cloud-based computing environment

A computer system, comprising:

• a processor;
• a memory communicatively coupled to the processor;
• and
• a program module which executes in the processor from the memory and which, when executed by the processor, causes the computer system to provide communication and coordination between web services in a cloud-based computing environment by
• executing, from a first web service, a call to an available events operation in a second web service to request subscription event identifiers corresponding to available events at the second web service,
• upon executing the call to the available events operation, receiving, at the first web service, the subscription event identifiers,
• upon receiving the subscription event identifiers, populating, at the first web service, a subscribe operation with a relevant subscription event identifier related to a subscribed event from the subscription event identifiers, wherein the subscribed event comprises updating of the second web service causing the second web service to be offline,
• upon populating the subscribe operation, executing, from the first web service, a call to the subscribe operation in the second web service to establish a subscription to the second web service,
• upon executing the call to the subscribe operation, receiving, at the first web service, a subscription identifier corresponding to the subscription,
• receiving, at the first web service, notifications related to the subscribed event at the second web service while the subscription is active by receiving, at the first web service, a notification to discard existing long-running service calls;
• and
• upon receiving the notification to discard existing long-running service calls, discarding, at the first web service, the existing long-running service calls.

A non-transitory computer-readable storage medium having computer-executable instructions stored thereon which, when executed by a computer, cause the computer to:

• execute, from a first web service, a call to an available events operation in a second web service to request subscription event identifiers corresponding to available events at the second web service;
• upon executing the call to the available events operation, receive, at the first web service, the subscription event identifiers;
• upon receiving the subscription event identifiers, populate, at the first web service, a subscribe operation with a relevant subscription event identifier related to a subscribed event from the subscription event identifiers, wherein the subscribed event comprises updating of the second web service causing the second web service to be offline;
• upon populating the subscribe operation, execute, from the first web service, a call to the subscribe operation in the second web service to establish a subscription to the second web service;
• upon executing the call to the subscribe operation, receive, at the first web service, a subscription identifier corresponding to the subscription;
• receive, at the first web service, notifications related to the subscribed event at the second web service while the subscription is active by receiving, at the first web service, a notification to discard existing long-running service calls;
• and
• upon receiving the notification to discard existing long-running service calls, discarding, at the first web service, the existing long-running service calls;
• upon receiving the notifications related to the subscribed event, populate, at the first web service, an unsubscribe operation with the subscription identifier;
• and
• upon populating the unsubscribe operation, execute, from the first web service, a call to the unsubscribe operation in the second web service to terminate the subscription to the second web service.