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Piggibacking Platform Events, Igor Chtivelband

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Platform Events is a powerful instrument, which can be applied, even if your organization is still not ready to go ""all-in"" with the event-driven architectural approach.
In Billie, Platform Events are used to inform admins about production issues, dispatch emails with individual attachments or to update locked records asynchronously. It is not precisely what Platform Events were designed for, that is why the second name of this session is ""How we crack nuts with the Great Seal of England""

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Piggibacking Platform Events, Igor Chtivelband

  1. 1. Piggybacking Platform Events or “How we crack nuts with the Great Seal of England” by Igor Chtivelband !1
  2. 2. #CD19 B.Sc. in Information Systems Engineering Double M.Sc. in Software Engineering Certified System and Application Architect VP Data at !2
  3. 3. #CD19 Event-driven architecture basics !3
  4. 4. #CD19 - First introduced in November 2017 - One can define a new Platform Event similarly to the way it is done with Custom Objects - Platform Events can be published using Apex, Declarative Tools (Process Builder/Flow) and API - Platform Events can be subscribed to using Apex Triggers, Process Builders and CometD Platform Events in Salesforce !4
  5. 5. #CD19 - Mainly we love them, because Platform Events help us to overcome transaction limits - We use them to inform Admins in case of exceptions/issues (MessageForAdmin__e) - We dispatch thousands of emails (some of them with custom attachments) in a couple of clicks (ContactOrLeadEmailRequest__e) - In case that a record is currently locked, we can update it asynchronously using a custom Platform Event So how exactly do we piggyback Platform Events in Billie? !5
  6. 6. #CD19 MessageForAdmin__e: Event Definition !6
  7. 7. #CD19 catch (Exception e){ MessageForAdmin__e m = new MessageForAdmin__e (); m.Subject__c = 'Bad news: tried to send email, but could not find Attachment'; m.Body__c = e.getMessage(); EventBus.publish(m); } MessageForAdmin__e: Publishing !7
  8. 8. #CD19 - Easy to send a notification from Apex code/process - Even if the main transaction is rolled-back, admins will still be notified - Since event publishing is decoupled from event consumption, we can always change the way the notifications are delivered (email, Slack, etc.) MessageForAdmin__e: advantages !8
  9. 9. #CD19 ContactOrLeadEmailRequest__e: Definition !9
  10. 10. #CD19 String ATTACHMENT_NAME_TEMPLATE = '2019-02-%_Billie_Invoice.pdf'; String EMAIL_TEMPLATE = 'Contact_Monthly_FeeInvoice'; List<ContactOrLeadEmailRequest__e> events = new List<ContactOrLeadEmailRequest__e>(); for (Attachment att: [SELECT parentId,Name FROM Attachment WHERE Name like :ATTACHMENT_NAME_TEMPLATE]){ events.add( new ContactOrLeadEmailRequest__e ( ObjectID__c = att.parentId, EmailTemplateName__c = EMAIL_TEMPLATE, AttachmentNamePattern__c = att.Name ) ); } List<Database.SaveResult> results = EventBus.publish(events); ContactOrLeadEmailRequest__e: Publishing !10
  11. 11. #CD19 - Limit of 100 emails per transaction is worked around - We can send mass emails with individual attachments (currently not supported by Salesforce “out of the box”) - No need to configure Email Alert - Email Messages are stored in Salesforce database and can be used for later analysis ContactOrLeadEmailRequest__e: advantages !11
  12. 12. #CD19 - Each EventBus.publish method call is considered a DML statement, and DML limits apply - Each EventBus.publish method call is considered an API call - If you are trying to publish Platform Events from an external system, you have to perform Oauth authentication - It is impossible to replay Platform Events from Apex - You can’t call Messaging.SingleEmailMessage methods directly in your event trigger Considerations for Publishing and Subscribing to Platform Events !12
  13. 13. Thank you! !13

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