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Force.com Enterprise Architecture

You're reading from   Force.com Enterprise Architecture Architect and deliver packaged Force.com applications that cater to enterprise business needs

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781786463685
Length 504 pages
Edition 2nd Edition
Languages
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Author (1):
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Andrew Fawcett Andrew Fawcett
Author Profile Icon Andrew Fawcett
Andrew Fawcett
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Toc

Table of Contents (15) Chapters Close

Preface 1. Building, Publishing, and Supporting Your Application FREE CHAPTER 2. Leveraging Platform Features 3. Application Storage 4. Apex Execution and Separation of Concerns 5. Application Service Layer 6. Application Domain Layer 7. Application Selector Layer 8. User Interface 9. Lightning 10. Providing Integration and Extensibility 11. Asynchronous Processing and Big Data Volumes 12. Unit Testing 13. Source Control and Continuous Integration Index

Execution contexts


An execution context on the platform has a beginning and an end; it starts with a user or system action or event, such as a button click or part of a scheduled background job, and is typically short lived; with seconds or minutes instead of hours before it ends. It is especially important in multitenant architecture because each context receives its own set of limits around queries, database operations, logs, and duration of the execution.

In the case of background jobs (Batch Apex), instead of having one execution context for the whole job, the platform splits the information being processed and hands it back through several execution contexts in a serial fashion. For example, if a job was asked by the user to process 1000 records and the batch size (or scope size in Batch Apex terms) was 200 (which is the default), this would result in five distinct execution contexts, one after another. This is done so that the platform can throttle the execution of jobs up or down or...

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