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Queueable classes

With the recent Spring '15 release, Apex developers have a new asynchronous tool, queueable Apex classes. At first glance, queueable classes are very similar to @future annotated methods. A closer look, however, reveals their true power. There are three key differences between @future and queueable classes:

• The method for enqueueing a job returns an ID, allowing you to monitor its progress much like a batch or scheduled job
• Queueable jobs accept sObjects
• Finally, and perhaps most importantly, queueable code can invoke queueable code—no more exceptions complaining about how you are trying to call the @future methods or batch methods from an @future context

Implementing the queueable interface is very similar to implementing the batchable ...