Salesforce integration Pattern:Remote Process Invocation—Fire and Forget

Problem
When an event occurs in Salesforce, how do you initiate a process in a remote system and pass the required information to that process without waiting for a response from the remote system?
Solution
The following table contains solutions to this integration problem.
Solution Fit Comments
Workflow-driven outbound messaging Best No customization is required in Salesforce to implement outbound messaging. The recommended solution for this type of integration is when the remote process is invoked from an insert or update event. Salesforce provides a workflow-driven outbound messaging capability that allows sending SOAP messages to remote systems triggered by an insert or update operation in Salesforce. These messages are sent asynchronously and are independent of the Salesforce user interface.
The outbound message is sent to a specific remote endpoint. The remote service must be able to participate in a contract-first integration where Salesforce provides the contract.
On receipt of the message, if the remote service doesn’t respond with a positive acknowledgment, Salesforce retries sending the message, providing a form of guaranteed delivery. When using middleware, this solution becomes a “first-mile” guarantee of delivery.
Outbound messaging and callbacks Best Callbacks provide a way to mitigate the impacts of out-of-sequence messaging. In addition, they handle these scenarios.
  • Idempotency— If an acknowledgment isn’t received in a timely fashion, outbound messaging performs retries. Multiple messages can be sent to the target system. Using a callback ensures that the data retrieved is at a specific point in time rather than when the message was sent.
  • Retrieving more data—A single outbound message can send data only for a single object. A callback can be used to retrieve data from other related records, such as related lists associated with the parent object.
The outbound message provides a unique SessionId that can be used as the authentication token. You can use the token to authenticate and authorize a callback using either the SOAP API or the REST API. The system performing the callback isn’t required to separately authenticate to Salesforce. The standard methods of either API can then be used to perform the desired business functions.
A typical use of this variant is the scenario in which Salesforce sends an outbound message to a remote system to create a record. The callback is used to update the original Salesforce record with the unique key of the record created in the remote system.
Custom Visualforce page that initiates an Apex SOAP or HTTP asynchronous callout Good This solution is typically used in user interface-based scenarios, but does require customization. In addition, the solution must handle guaranteed delivery of the message in the code.
In this pattern, Salesforce doesn’t wait for the request to complete before handing off control to the user.
After receiving the message, the remote system responds and indicates receipt of the message, then asynchronously processes the message. The remote system hands control back to Salesforce before it begins to process the message; therefore, Salesforce doesn’t have to wait for processing to complete.
A trigger that’s invoked from Salesforce data changes performs an Apex SOAP or HTTP asynchronous callout Suboptimal You can use Apex triggers to perform automation based on record data changes.
An Apex proxy class can be executed as the result of a DML operation by using an Apex trigger. However, all calls made from within the trigger context must be executed asynchronously.
A batchApex job that performs an Apex SOAP or HTTP asynchronous callout Suboptimal Calls to a remote system can be performed from a batch job. This solution allows for batch remote process execution and for processing of the response from the remote system in Salesforce. However, there are limits to the number of calls for a given batch context.

Sketch

The following diagram illustrates a call from Salesforce to a remote system in which create or update operations on a record trigger the call.


Source : http://www.saasanalogy.com/salesforce-integration-patternremote-process-invocation-fire-and-forget/

Comments

  1. Ram Ramky19 April 2018 at 03:48

    Thank you for this post!! I have just discovered your blog recently and I really like it! I will definitely try some of your insights.
    Salesforce Developer 501 Training in Chennai
    Salesforce Developer 502 Training in Chennai

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