Question

I have a class:

MessageReceiver.java

that receives messages but can also produce messages indirectly (that then could potentially be redelivered to this class). I don’t want to process messages that were sent with MessageReceiver.java in the stack trace. Is there a way to efficiently determine if the message I received was from MessageReceiver.java?

The following chain is possible:

MessageReceiver.java -> OtherClass.java -> MessageProducer.java -> MessageReceiver.java

Answer 1

I think this is what you’re after:

Class<?> myClass = MessageReceiver.class;
StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();

for (StackTraceElement element : stackTrace) {
    if (element.getClassName().equals(myClass.getCanonicalName())) {
        System.out.println("class found in stack trace");
        break;
    }
}

---

If you’re using java-8 or higher, you can also use the following

Class<?> myClass = MessageReceiver.class;
StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();

boolean found = Arrays.stream(stackTrace)
                      .map(StackTraceElement::getClassName)
                      .anyMatch(myClass.getCanonicalName::equals);

if (found) {
    System.out.println("class found in stack trace");
}