elek commented on pull request #2330:
URL: https://github.com/apache/ozone/pull/2330#issuecomment-861396282
Ok, I checked the implementation and it looks like a bug in `TraceAllMethod`
where we need using `getMethods` instead of `getDeclaredMethods`
I think `getDeclaredMethods` was used to avoid tracing the `Object` methods
(`toString`,`equals`) but those can be excluded:
The fixed version looks like:
```
public TraceAllMethod(T delegate, String name) {
this.delegate = delegate;
this.name = name;
for (Method method : delegate.getClass().getMethods()) {
if (!methods.containsKey(method.getName())) {
methods.put(method.getName(), new HashMap<>());
}
if (!method.getDeclaringClass().equals(Object.class)) {
methods.get(method.getName()).put(method.getParameterTypes(),
method);
}
}
}
```
Tested with this unit test:
```
package org.apache.hadoop.hdds.tracing;
import org.junit.Assert;
import org.junit.Test;
public class TestTraceAllMethod {
@Test
public void tracing() throws Throwable {
final TraceAllMethod tracer = new TraceAllMethod(new ServiceImpl(),
"test");
Assert.assertEquals("Hello noname", tracer.invoke(null,
ServiceImpl.class.getMethod("hello"), new Object[]{}));
Assert.assertEquals("Hello asd", tracer.invoke(null,
ServiceImpl.class.getMethod("hello", String.class), new Object[]{"asd"}));
}
public interface Service {
default String hello() {
return hello("noname");
}
String hello(String name);
}
public static class ServiceImpl implements Service {
@Override
public String hello(String name) {
return "Hello " + name;
}
}
}
```
I think it would be greate to have this more resilient fix, but I am fine
with both including it here or submitting it in a new PR.
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