Earlier I wrote a blog post dedicated to Asynchronous processing in Salesforce. This time I will focus on Queueable Apex only.Queueable Apex is a more advanced version of future methods. It has all the functionalities of the future method along with the power of Batch Apex. So – Queueable Apex = Future Method + Batch ApexIt provides additional job chaining and allows for more complex data types.With Queueable Apex, developers will be able to submit jobs for asynchronous processing, like something future method can do as well. But the difference comes here -Flexibility in method parameters: With Queueable Apex, developers will be able to create classes that will allow member variables of non-primitive data types like sObjects or custom Apex types. Monitor the progress: Once the developer submits a job by executing the command System.enqueuJob, it provides an ID, which is basically a Job Id. With that Id, the developer can now query the progress either from Salesforce interface in the Apex Job page or by querying the AsyncApexJob table.Chaining jobs: Developer can now chain jobs i.e. starting a new queueable job from an already running queueable job.Batchable vs Future vs QueueableBatchable was the first one introduced by Salesforce for asynchronous heavy processing. It was “heavy” in terms of resource usage and also needs longer time to process/complete the work.To solve the problem with Batchable, Salesforce introduced the Future method. It...Read More
While studying for the Salesforce Platform Developer II certification, I was going through the different options Apex provides to run Apex code asynchronously. This post is all about sharing the study notes with key points to remember.Apex provides four options to run code asynchronously. Future Method, Queueable Apex, Batch Apex and Scheduled Apex.Future MethodsMethods are annotated with @future annotation.Future methods should be static and can only return void type.It supports parameters, but parameters should be primitive data types, arrays of primitive data types, or collection. sObjects or objects cannot be used as parameters to future methods.These methods run in their own thread and will only start when the resources are available.They are used for long running operations and prevent any delay in apex transaction.They can be used for callouts to external web services and also separating DML operations to prevent Mixed DML error.Future methods should not be used for processing large amount of data. In that case, Batch Apex should be used.To test future methods, enclose test code between startTest and stopTest test methods.Future methods not necessarity execute in the same order as they are called.Future methods cannot be used inside Visualforce controllers getter, setter, constructor methods.Reference: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_invoking_future_methods.htmhttps://trailhead.salesforce.com/en/content/learn/modules/asynchronous_apex/async_apex_future_methodsQueueable ApexApex code must implement Queueable interace.By implementing Queueable interface, Apex class can be added to the job queue and it will run when the system resources are available.The difference between Queueable Apex...Read More
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