以下是一个完整的示例,展示如何使用ByteBuddy AgentBuilder来设置KafkaListenerContainerFactory的钩子:
import net.bytebuddy.agent.builder.AgentBuilder;
import net.bytebuddy.matcher.ElementMatchers;
import org.springframework.kafka.listener.KafkaListenerContainerFactory;
public class KafkaListenerContainerFactoryAgent {
public static KafkaListenerContainerFactory hook(KafkaListenerContainerFactory containerFactory) {
return new AgentBuilder.Default()
.type(ElementMatchers.named(containerFactory.getClass().getName()))
.transform((builder, typeDescription, classLoader, module) ->
builder.method(ElementMatchers.named("createListenerContainer"))
.intercept(MethodDelegation.to(KafkaListenerContainerFactoryInterceptor.class)))
.with(getClass().getClassLoader())
.build()
.load(getClass().getClassLoader(), ClassLoadingStrategy.Default.WRAPPER)
.getLoaded()
.newInstance();
}
public static class KafkaListenerContainerFactoryInterceptor {
@RuntimeType
public static Object intercept(@SuperCall Callable
你可以使用此类来替换现有的KafkaListenerContainerFactory实例:
@Bean
public KafkaListenerContainerFactory> kafkaListenerContainerFactory() {
KafkaListenerContainerFactory> factory = new ConcurrentKafkaListenerContainerFactory<>();
// add your factory configuration
return KafkaListenerContainerFactoryAgent.hook(factory);
}
通过这种方法,你可以在不修改应用程序代码的情况下,拦截和修改KafkaListenerContainerFactory的方法调用。