Planned lessonMID-009-L06

Demo: building a mini @Timed with a proxy

On This Lesson 3 topics

This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.

In this lesson

build an annotation-driven interceptor; prepares MID-009-LAB1.

Draft outline details

Define @Timed (RUNTIME, METHOD) and an interface PriceService with an implementation.
Write a Proxy.newProxyInstance handler that checks the annotation on the target method and logs elapsed time.
Call through the proxy; see the timing log.
Planned mistake: annotate only the interface method and read the annotation from the implementation class (not found). Fix: look up the annotation on the target class method (and note Spring's own lookup rules).
Add an internal call between two methods; show it is not timed (self-invocation).
Discuss reflection cost and caching Method lookups.

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