mufiye commented on issue #9999:
URL: https://github.com/apache/skywalking/issues/9999#issuecomment-1396388730
Hello, @wu-sheng . I have completed the toolkit and pass the unit test part.
Now I am writing the plugin automatic tests. But I encounter one problem and I
have no idea to solve it.
To implement the createExitSpan with inject function, I use the Interceptor
below. But when I start the automatic tests and run the
`Tracer.createExitSpan`, it will report the Exception in the
skywalking-api.log. I think the `ContextCarrier` implement the
`EnhancedInstance` interface after intercepting, but why it can not cast?
```java
public class Tracer {
public static SpanRef createExitSpan(String operationName,
ContextCarrierRef carrierRef, String remotePeer) {
return new SpanRef();
}
}
```
```java
public class TracerCreateExitSpanWithContextInterceptor implements
StaticMethodsAroundInterceptor {
@Override
public void beforeMethod(Class clazz, Method method, Object[]
allArguments, Class<?>[] parameterTypes, MethodInterceptResult result) {
}
@Override
public Object afterMethod(Class clazz, Method method, Object[]
allArguments, Class<?>[] parameterTypes, Object ret) {
ContextCarrier contextCarrier = new ContextCarrier();
AbstractSpan exitSpan =
ContextManager.createExitSpan(String.valueOf(allArguments[0]), contextCarrier,
String.valueOf(allArguments[2]));
((EnhancedInstance)
allArguments[1]).setSkyWalkingDynamicField(contextCarrier);
((EnhancedInstance) ret).setSkyWalkingDynamicField(exitSpan);
return ret;
}
...
}
```
```java
public class ContextCarrierRef {
public CarrierItemRef items() {
return new CarrierItemRef();
}
}
```
```java
public class ContextCarrierRefActivation extends
ClassInstanceMethodsEnhancePluginDefine {
private static final String ENHANCE_CLASS =
"org.apache.skywalking.apm.toolkit.trace.ContextCarrier";
private static final String ITEMS_METHOD_NAME = "items";
private static final String ITEMS_INTERCEPTOR_CLASS =
"org.apache.skywalking.apm.toolkit.activation.trace.ContextCarrierRefItemsInterceptor";
@Override
protected ClassMatch enhanceClass() {
return NameMatch.byName(ENHANCE_CLASS);
}
@Override
public ConstructorInterceptPoint[] getConstructorsInterceptPoints() {
return new ConstructorInterceptPoint[0];
}
@Override
public InstanceMethodsInterceptPoint[]
getInstanceMethodsInterceptPoints() {
return new InstanceMethodsInterceptPoint[] {
new InstanceMethodsInterceptPoint() {
@Override
public ElementMatcher<MethodDescription> getMethodsMatcher()
{
return named(ITEMS_METHOD_NAME);
}
@Override
public String getMethodsInterceptor() {
return ITEMS_INTERCEPTOR_CLASS;
}
@Override
public boolean isOverrideArgs() {
return false;
}
}
};
}
}
```
```
ERROR 2023-01-19 02:57:58.212 http-nio-8080-exec-2 StaticMethodsInter :
class[class org.apache.skywalking.apm.toolkit.trace.Tracer] after static
method[createExitSpan] intercept
failure:org.apache.skywalking.apm.toolkit.trace.ContextCarrierRef cannot be
cast to
org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance
java.lang.ClassCastException:
org.apache.skywalking.apm.toolkit.trace.ContextCarrierRef cannot be cast to
org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance
at
org.apache.skywalking.apm.toolkit.activation.trace.TracerCreateExitSpanWithContextInterceptor.afterMethod(TracerCreateExitSpanWithContextInterceptor.java:41)
at
org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.StaticMethodsInter.intercept(StaticMethodsInter.java:94)
at
org.apache.skywalking.apm.toolkit.trace.Tracer.createExitSpan(Tracer.java)
at
test.apache.skywalking.apm.testcase.toolkit.controller.TestService.endServiceWithCarrier(TestService.java:81)
at
test.apache.skywalking.apm.testcase.toolkit.controller.CaseController.testcase$original$mL17GHKM(CaseController.java:76)
...
```
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