© Donald F. Ferguson, 2014. All rights reserved. Topics in Computer Science: Modern Internet Service Oriented Application Development Lecture 8: IPaaS.

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© Donald F. Ferguson, All rights reserved. Topics in Computer Science: Modern Internet Service Oriented Application Development Lecture 8: IPaaS Dr. Donald F. Ferguson (Admin:

2 © Donald F. Ferguson, All rights reserved.Modern Internet Service Oriented Application Development – Lecture 8: IPaaS Add Boomi Here

3 © Donald F. Ferguson, All rights reserved.Modern Internet Service Oriented Application Development – Lecture 8: IPaaS Backup

4 © Donald F. Ferguson, All rights reserved.Modern Internet Service Oriented Application Development – Lecture 8: IPaaS Amazon Simple Workflow

5 © Donald F. Ferguson, All rights reserved.Modern Internet Service Oriented Application Development – Lecture 8: IPaaS AWS Simple Workflow

6 © Donald F. Ferguson, All rights reserved.Modern Internet Service Oriented Application Development – Lecture 8: IPaaS Amazon Simple Workflow

7 © Donald F. Ferguson, All rights reserved.Modern Internet Service Oriented Application Development – Lecture 8: IPaaS Application Structure Role of the Activities Worker: The activities worker performs the various tasks that the workflow must accomplish. It consists of: –The activities implementation, which includes of a set of activity methods that perform particular tasks for the workflow. –An activity worker, which uses HTTP long poll requests to poll Amazon SWF for activity tasks. When a task is available, Amazon SWF responds to the request by sending the information required to perform the task. The activity worker then calls the appropriate activity method, and returns the results to Amazon SWF. Role of the Workflow Worker: The workflow worker orchestrates the execution of the various activities, manages data flow, and handles failed activities. It consists of: –The workflow implementation, which includes the activity orchestration logic, handles failed activities, and so on. –An activities client, which serves as a proxy for the activities worker and enables the workflow worker to schedule activities to be executed asynchronously. –A workflow worker object, which uses HTTP long poll requests to poll Amazon SWF for decision tasks. If there are tasks on the workflow task list, Amazon SWF responds to the request by returning the information that is required to perform the task. The framework then executes the workflow to perform the task and returns the results to Amazon SWF.