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How to register / trace any call to an object method in java

I need something like a Python decorator. I need to save some information, in particular, the method called, the start time, the end time and its arguments. I cannot import anything outside of Java 1.5 libraries. Is there something like what is available in Python?

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6 answers

A good tracking tool for Java is BTrace .

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You can try profiling with Java Management Extensions or java agent.

See http://java.sun.com/developer/technicalArticles/releases/j2se15/#mnm

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No, Python decorators do not allow you to control all the code without changing anything. You should still put your decorator everywhere (and essentially wrap each of your functions in a function that does the counting).

I’m not sure how much I understand your requirements (you don’t say whether you need code for production or testing, also the requirement “do not import anything” is strange: are all your classes in the package by default? Did you allow to use IDE and compiler?) but I think the easiest way would be to use a Javassist (the second link kindly provided by cschooley is a great introduction), but do not use the agent: use CtClass # write () instead in the instrument class files and save them to disk (maybe in custom for Aceh ant). Thus, the final assembly does not need any special configuration.

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You can get away with the Java Proxy class if you can only rely on interface methods.

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@Loggable annotation and AspectJ aspect from jcabi-aspects can help you. Annotate all your methods and each time they are called SLF4J, they will receive log messages:

 @Loggable(Loggable.DEBUG) public String load(URL url) { return url.openConnection().getContent(); }

The following versions of jcabi-aspects will implement full class logging: https://github.com/yegor256/jcabi/issues/129

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Source: https://habr.com/ru/post/1369541/

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