java – @AroundInvoke拦截器在@WebService类上被调用两次

在@WebService类上调用@AroundInvoke拦截器两次,
如果截取的方法是通过端点作为SOAP Web服务从应用程序外部调用的.
如果从另一个bean内部调用相同的方法,它只被调用一次(正如我所料).

截获的方法本身始终只调用一次！

问题1：我可以只拦截一次拦截器吗？

问题2：如果我不能,是否有可转移的(服务器独立的)方式来决定我在哪个拦截器中,那么我可以忽略多余的拦截器？

问题3：这种行为是否常见(并在某些文档中定义和描述),
或者它是否依赖于我的特定环境(JBoss EAP 6.4.0)？

观察：

>这两个调用不在同一个拦截器链中.
>它与拦截器类的实例不同.
>两个调用的InvocationContext的实现类都不同.
>有趣的是,contextData(InvocationContext的用于沿拦截器链传递数据的字段)之一不是HashMap的实例,而是WrappedMessageContext,但它无论如何都不包装其他contextData.

最小的可重现代码

(我删除了包名.)

MyEndpoint界面

import javax.jws.WebService;

@WebService
public interface MyEndpoint {
    public static final String SERVICE_NAME = "MyEndpointService";
    public String getHello();
}

MyEndpointImpl类

import javax.interceptor.Interceptors;
import javax.jws.WebService;

@WebService(endpointInterface = "MyEndpoint",serviceName = MyEndpoint.SERVICE_NAME)
@Interceptors({TestInterceptor.class})
public class MyEndpointImpl implements MyEndpoint {
    @Override
    public String getHello() {
        System.out.println("MyEndpointImpl.getHello() called");
        return "Hello";
    }
}

TestInterceptor类

import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;

public class TestInterceptor {
    @AroundInvoke
    private Object countCalls(InvocationContext ic) throws Exception {
        System.out.println("Interceptor called");
        return ic.proceed();
    }
}

产量

Interceptor called
Interceptor called
MyEndpointImpl.getHello() called

更多细节

为了获得更多运行时信息,我添加了更多日志记录

MyEndpointImpl类

import java.lang.reflect.Method;
import java.util.Map;
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TestInterceptor {
    private static Logger logger = LoggerFactory.getLogger(TestInterceptor.class);
    private static int callCnt = 0;

    @AroundInvoke
    private Object countCalls(InvocationContext ic) throws Exception {
        final String interceptorClass = this.toString();
        final String invocationContextClass = ic.getClass().getName();
        final Method method = ic.getMethod();
        final String calledClass = method.getDeclaringClass().getName();
        final String calledName = method.getName();
        final String message = String.format(
                "%n    INTERCEPTOR: %s%n    InvocationContext: %s%n    %s # %s()",interceptorClass,invocationContextClass,calledClass,calledName);
        logger.info(message);

        final int call = ++callCnt;
        final Map<String,Object> contextData = ic.getContextData();
        contextData.put("whoami",call);

        logger.info("BEFORE PROCEED {},{}",call,contextData);
        final Object ret = ic.proceed();
        logger.info("AFTER PROCEED {},contextData);
        return ret;
    }
}

产量

INTERCEPTOR: TestInterceptor@74c90b72
    InvocationContext: org.jboss.invocation.InterceptorContext$Invocation
    MyEndpointImpl # getHello()
BEFORE PROCEED 1,org.apache.cxf.jaxws.context.WrappedMessageContext@2cfccb1d
    INTERCEPTOR: TestInterceptor@5226f6d8
    InvocationContext: org.jboss.weld.interceptor.proxy.InterceptorInvocationContext
    MyEndpointImpl # getHello()
BEFORE PROCEED 2,{whoami=2}
MyEndpointImpl.getHello() called
AFTER PROCEED 2,{whoami=2}
AFTER PROCEED 1,org.apache.cxf.jaxws.context.WrappedMessageContext@2cfccb1d