Implement locking for some Workflow API operations

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 M3
• Fix Version/s: 6.1.X EE, 6.2.X EE, 7.0.0 M2
• Component/s: Workflow, Workflow > API, Workflow > API > Kaleo Engine
• Labels:
  • QA-TP
  • ee-ts
• Branch Version/s:
  6.2.x, 6.1.x
• Backported to Branch:
  Committed
• Story Points: 2
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-plugins/pull/3796

Some operations on the Workflow API needs to be synchronized to avoid concurrency issues

Some examples are:

1. WorkflowInstance signalWorkflowInstance
2. WorkflowTask completeWorkflowTask