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I have a class of common code that is thread safe.
One of the methods in that class is abstract and needs to be overridden for different implementations.
I need to ensure or at least flag to other developers that all implementations of this method need to be thread-safe.
What is the best way to do this?
Is there a keyword or annotation to this effect?
I have already tried abstract synchronized but that combination of keywords is not allowed.
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Synchronized method Overriding !! Above code compiles ,so answer to above question is “yes,synchronized method can be overriden” .
getMethod("myMethod"). getDeclaringClass(); If the class that's returned is your own, then it's not overridden; if it's something else, that subclass has overridden it.
Similarly, you can prevent a method from being overridden by subclasses by declaring it as a final method. An abstract class can only be subclassed; it cannot be instantiated. An abstract class can contain abstract methods—methods that are declared but not implemented.
You can't do it directly. One thing you can do is have the method be concrete, but invoke an abstract method:
public synchronized final void foo() { doFoo(); } protected abstract void doFoo(); That way, doFoo() will always* be invoked under the synchronization established by foo().
* unless someone invokes it directly, so you should name and document it to make it clear that they shouldn't.
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