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How do you use Continuation in Apex?
Use the Continuation class to make callouts asynchronously to a SOAP or REST Web service. When the user hits Start Request button, the callout is made to the URL. Once the response is sent, processResponse method will be called. statusBool variable will be true when the request is hit and it shows the message.
What is Salesforce Continuation?
Continuation Class: Continuation Class is used to make asynchronous callout using REST and SOAP services. Using this class, we can make a long running request from a Visualforce page to external systems, and can integrate our Visualforce pages with complex back end systems.
What are Apex callouts?
An Apex callout enables you to tightly integrate your Apex with an external service by making a call to an external Web service or sending a HTTP request from Apex code and then receiving the response. Apex provides integration with Web services that utilize SOAP and WSDL, or HTTP services (RESTful services).
What is asynchronous callout?
An asynchronous callout is a callout that is made from a Visualforce page for which the response is returned through a callback method. An asynchronous callout is also referred to as a continuation . This diagram shows the execution path of an asynchronous callout, starting from a Visualforce page.
What is Apex Continuation?
In Apex a Continuation refers to an asynchronous external callout (a callout that runs in the background). What this means is that the thread you opened when you made a callout becomes dormant while it’s awaiting a response.
What is Apex continuation?
How long can a continuation be used in apex?
Process the response in a callback method. An asynchronous callout made with a continuation doesn’t count toward the Apex limit of 10 synchronous requests that last longer than five seconds. Here’s a list of steps for working with a continuation in an Apex class.
How many asynchronous callouts can I make in apex?
You can make up to three asynchronous callouts in a single continuation. Add these callout requests to the same continuation by using the addHttpRequest method of the Continuation class. The callouts run in parallel for this continuation and suspend the Visualforce request.
In the following example application, the button action is implemented in an Apex controller method. The action method creates a Continuation and returns it. After the request is sent to the service, the Visualforce request is suspended.
How to create an apex callback in Java?
// Create continuation. Argument is timeout in seconds. Set an Apex callback method to be invoked after the callout completes in the continuationMethod property of the Continuation object. In this example, the callback method is processResponse. The callback method must be in the same Apex class.