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What is a use case for using a dynamic proxy?
How do they relate to bytecode generation and reflection?
Any recommended reading?
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A dynamic proxy class is a class that implements a list of interfaces specified at runtime such that a method invocation through one of the interfaces on an instance of the class will be encoded and dispatched to another object through a uniform interface.
JDK Dynamic Proxies allow one to create implementations of Java interfaces at runtime by the means of Reflection. A proxy may be seen as a subject that will forward method calls to target instances and eventually return any result produced by the target instance to the caller.
Dynamic proxies allow one single class with one single method to service multiple method calls to arbitrary classes with an arbitrary number of methods. A dynamic proxy can be thought of as a kind of Facade, but one that can pretend to be an implementation of any interface.
The Proxy class is basically the Proxy design pattern. In this pattern an object provides a modified interface for another class. Let us see one example. In this example, we want to make an array class, that can store only binary values [0, 1].
I highly recommend this resource.
First of all, you must understand what the proxy pattern use case. Remember that the main intent of a proxy is to control access to the target object, rather than to enhance the functionality of the target object. The access control includes synchronization, authentication, remote access (RPC), lazy instantiation (Hibernate, Mybatis), AOP (transaction).
In contrast with static proxy, the dynamic proxy generates bytecode which requires Java reflection at runtime. With the dynamic approach you don't need to create the proxy class, which can lead to more convenience.
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