javax.interceptor

Interface InvocationContext

public interface InvocationContext

Exposes context information about the intercepted invocation and operations that enable interceptor methods to control the behavior of the invocation chain.

    @AroundInvoke
    public Object logInvocation(InvocationContext ctx) throws Exception {
       String class = ctx.getMethod().getDeclaringClass().getName();
       String method = ctx.getMethod().getName();
       Logger.global.entering(class, method, ctx.getParameters());
       try {
          Object result = ctx.proceed();
          Logger.global.exiting(class, method, result);
          return result;
       }
       catch (Exception e) {
          Logger.global.throwing(class, method, e);
          throw e;
       }

    }
 
 

Since:

Interceptors 1.0

Method Summary

Methods

Modifier and Type	Method and Description
Constructor<?>	getConstructor() Returns the constructor of the target class for which the interceptor was invoked.
Map<String,Object>	getContextData() Enables an interceptor to retrieve or update the data associated with the invocation by another interceptor, business method,and/or webservices context in the invocation chain.
Method	getMethod() Returns the method of the target class for which the interceptor was invoked.
Object[]	getParameters() Returns the parameter values that will be passed to the method or constructor of the target class.
Object	getTarget() Returns the target instance.
Object	getTimer() Returns the timer object associated with a timeout method invocation on the target class, or a null value for method and lifecycle callback interceptor methods.
Object	proceed() Proceed to the next interceptor in the interceptor chain.
void	setParameters(Object[] params) Sets the parameter values that will be passed to the method or constructor of the target class.

Method Detail

getTarget

Object getTarget()

Returns the target instance. For the AroundConstruct lifecycle callback interceptor method, the getTarget returns null if called before the proceed() method.

Returns:

the target instance

getTimer

Object getTimer()

Returns the timer object associated with a timeout method invocation on the target class, or a null value for method and lifecycle callback interceptor methods. For example, when associated with an EJB component timeout, this method returns Timer

Returns:

the timer object or a null value

Since:

Interceptors 1.1

getMethod

Method getMethod()

Returns the method of the target class for which the interceptor was invoked. In a lifecycle callback interceptor for which there is no corresponding lifecycle callback method on the target class or in the AroundConstruct lifecycle callback interceptor method, getMethod returns null.

Returns:

the method, or a null value

getConstructor

Constructor<?> getConstructor()

Returns the constructor of the target class for which the interceptor was invoked. For AroundConstruct interceptor, the constructor of the target class is returned. For all other interceptors, a null value is returned.

Returns:

the constructor, or a null value

getParameters

Object[] getParameters()

Returns the parameter values that will be passed to the method or constructor of the target class. If setParameters(java.lang.Object[]) has been called, getParameters returns the values to which the parameters have been set.

Returns:

the parameter values, as an array

Throws:

IllegalStateException - if invoked within a lifecycle callback method which is not an AroundConstruct callback.

setParameters

void setParameters(Object[] params)

Sets the parameter values that will be passed to the method or constructor of the target class.

Parameters:

params - the parameter values, as an array

Throws:

IllegalStateException - if invoked within a lifecycle callback method which is not an AroundConstruct callback.

IllegalArgumentException - if the types of the given parameter values do not match the types of the method or constructor parameters, or if the number of parameters supplied does not equal the number of method or constructor parameters (if the last parameter is a vararg parameter of type T, it is considered to be equivalent to a parameter of type T[]).

getContextData

Map<String,Object> getContextData()

Enables an interceptor to retrieve or update the data associated with the invocation by another interceptor, business method,and/or webservices context in the invocation chain. If interceptors are invoked as a result of the invocation on a web service endpoint, the returned value will be an instance of javax.xml.rpc.handler.MessageContext

Returns:

the context data associated with this invocation or lifecycle callback. If there is no context data, an empty Map<String,Object> object will be returned.

proceed

Object proceed()
               throws Exception

Proceed to the next interceptor in the interceptor chain. For the around-invoke or around-timeout interceptor methods, the invocation of the last interceptor method in the chain causes the invocation of the target class method. For AroundConstruct lifecycle callback interceptor methods, the invocation of the last interceptor method in the chain causes the target instance to be created. For all other lifecycle callback interceptor methods, if there is no callback method defined on the target class, the invocation of proceed in the last interceptor method in the chain is a no-op

Return the result of the next method invoked, or a null value if the method has return type void.

Returns:

the return value of the next method in the chain

Throws:

Exception