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Original file line number Diff line number Diff line change
Expand Up @@ -34,10 +34,20 @@ public List<String> getAdditionalHelperClassNames() {
return Arrays.asList("instrumentation.TestHelperClass");
}

@Override
public boolean isHelperClass(String className) {
return "instrumentation.TestSingletons".equals(className);
}

@Override
public void injectClasses(ClassInjector injector) {
injector
.proxyBuilder("instrumentation.TestHelperClass")
.inject(InjectionMode.CLASS_AND_RESOURCE);
}

@Override
public boolean isIndyReady() {
return true;
}
}
Original file line number Diff line number Diff line change
@@ -0,0 +1,16 @@
/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/

package instrumentation;

import io.opentelemetry.instrumentation.api.util.VirtualField;

public class TestSingletons {

public static final VirtualField<Runnable, String> STRING =
VirtualField.find(Runnable.class, String.class);

private TestSingletons() {}
}
Original file line number Diff line number Diff line change
Expand Up @@ -5,9 +5,9 @@

package instrumentation;

import static instrumentation.TestSingletons.STRING;
import static net.bytebuddy.matcher.ElementMatchers.named;

import io.opentelemetry.instrumentation.api.util.VirtualField;
import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
import net.bytebuddy.asm.Advice;
Expand Down Expand Up @@ -36,7 +36,7 @@ public static class TestAdvice {
@AssignReturned.ToReturned
@Advice.OnMethodExit
public static String methodExit(@Advice.This Runnable test) {
VirtualField.find(Runnable.class, String.class).set(test, "instrumented");
STRING.set(test, "instrumented");
return "instrumented";
}
}
Expand All @@ -47,7 +47,7 @@ public static class Test2Advice {
@AssignReturned.ToReturned
@Advice.OnMethodExit
public static String methodExit(@Advice.This Runnable test) {
return VirtualField.find(Runnable.class, String.class).get(test);
return STRING.get(test);
}
}
}
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