Let's assume that we want to get in on the update() action, we want to add some custom logic - maybe notify some observer class - when update() is called. Nothing unusual is happening here, the arrows show exactly what we would expect to happen given the code listings. Let's consider the flow of execution when the setPos setter is called from some external code: This is an important fact to bear in mind when we consider Injection Points later on.
This is included because - in bytecode terms - there is no such thing as an implicit return, there is always a RETURN opcode in the method bytecode. Notice that even though the methods return void, I have still included an explicit return in the code listing.
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The update method handles sending the object state to the server when properties are changed. The internal behaviour of Flard is that whenever a property is mutated, the setter for the property always calls the update() method before returning. The following diagram shows a schematic view of some code in an extremely simple class Flard: An injection point definition - this is an annotation which tells the mixin processor where to create instructions inside an existing method (known as the target method) which will invoke our handler method.īefore we go into too much detail, let's introduce our case study example.A regular mixin method known as a handler method, this method is added to the target class by our mixin with some custom code within it.
In fact, even with more complex functionality like Intrinsic Proxies, the code which ultimately ends up in the target class is only ever going to be a blend of original bytecode and new code supplied by you.Ĭallback Injectors are the first Mixin technology you will learn about where this is no longer the case: with Callback Injectors, the Mixin processor can be instructed to generate new code for us.
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If you've read the Introduction Series, you know how to leverage the Mixin processor to merge code you provide into a target class. Code Out Of The Aether - Discovering Injectors If you haven't read the Introduction Series, turn back now, because here be dragons.
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