[SalesForce] Invoke an apex class from Batch class

I've created an Apex class to perform some calculations in the Cases. I would like to schedule it every day. I'm trying to achieve this using a Batch class since the volumes of data is exceeding the Governor's limit. I've developed a class with schedulable interface to invoke the batch class. I've created a batch class with the query in the start method and AsyncApexJob in the finish method. I just wanted the batch class execute method to call the apex class. Is it possible to just call an apex class from a Batch class?

Best Answer

You can definitely call another apex method from another class. Not knowing what your code looks like, I can't point out if there are going to be issues with governor limits etc. In your execute method just simply call your other apex method, passing the batch list of records as a parameter:

Batch:

// some code ...

global void execute(Database.BatchableContext BC, List<sObject> scope)
{
    // if public/global and not static
    YourOtherClass instance = new YourOtherClass();
    instance.myMethod((List <Case>)scope);

    // if static
    // YourOtherClass.myMethod((List <Case>)scope);
}

// some code ...

And your other class' method should look like this:

public static void(List <Case> cases)
{
    // do something with the cases
}

Related Solutions

[SalesForce] Find Apex batch status programmatically

You can check the AsyncApexJob.Status using the JobId from the Database.BatchableContext.

E.g.

global void finish(Database.batchablecontext bc) {

    // Check batch status - IF COMPLETED then 
    AsyncApexJob a = [Select Id, Status, NumberOfErrors, JobItemsProcessed,
        TotalJobItems, CreatedBy.Email, ExtendedStatus
        from AsyncApexJob where Id = :bc.getJobId()];        

    if(a.Status == 'Completed') {


        // 1. Send Email (CSV created in execute method)


        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        // Send the email to the job submitter
        String[] toAddresses = new String[] {a.CreatedBy.Email};
        mail.setToAddresses(toAddresses);
        mail.setSenderDisplayName('Batch Processing');
        mail.setSubject('x70RecordExtract  Status: ' + a.Status);
            mail.setPlainTextBody('The batch Apex job processed ' + a.TotalJobItems +
            ' batches with '+ a.NumberOfErrors + ' failures. ExtendedStatus: ' + a.ExtendedStatus);

        // Add your attachment to the email.

        Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });


        // 2. database.executebatch(new chain_batch(),200);

    }
}

[SalesForce] Calling future method from batch class

Definitely you can use an HTTP callout as an escape mechanism. But this is pretty naughty. You'll need a Remote Site Setting and a Session ID and a global class etc etc etc (red flags, alarm bells).

May I humbly recommend the use of System.Queueable call instead of @Future. You can create a class that is constructed with any kind of argument that you want to hand in, like so:

public class DeferredHandler implements System.Queueable
{

    private Map<String,String> key2val;

    public DeferredHandler(Map<String,String> key2val) {
        this.key2val = key2val;
    }

    public void execute(System.QueueableContext objContext)
    {
        //do your @Future stuff here with this.key2val
    }

}

And invoke him from inside your batch like this:

//defer stuff
System.Queueable job = new DeferredHandler(key2val);
System.enqueueJob(job);

There is some literature about this in the docs and Josh Kaplan's awesome Queueable blog post.

Best Answer

Related Solutions

[SalesForce] Find Apex batch status programmatically

[SalesForce] Calling future method from batch class

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