Question

I am using Apach CXF as REST provider.

I want to gather data when I enter the webservice, gather data before I enter the resposne and add some calculation to the response. For this question and for simplicity, lets assume I want to get the starting time on entering, the finishing time before the response is sent and add the total time to the response.

Now, how do I do that? I created In and Out interceptors that works fine alone, but how do I use the data from the In interceptor in the Out interceptor?

Thanks
Idob

UPDATE:

I tried to set the data as contextual parameter with

message.setContextualProperty(key,value);

but I am getteing NULL on

message.getContextualProperty(key);

I also tried the same but just with

message.put(key,value) and message.get(key)

didn’t work.

Idea’s anyone?

Thank you,
Idob

Answer 1

You can store values on the Exchange. CXF creates an Exchange object for each request to act as a container for the in and out messages for the request/response pair and makes it accessible as message.getExchange() from both.

In interceptor:

public void handleMessage(Message inMessage) throws Fault {
  inMessage.getExchange().put("com.example.myKey", myCustomObject);
}

Out interceptor

public void handleMessage(Message outMessage) throws Fault {
  MyCustomObject obj = (MyCustomObject)outMessage.getExchange().get("com.example.myKey");
}

(or vice-versa for client-side interceptors, where the out would store values and the in would retrieve them). Choose a key that you know won’t be used by other interceptors – a package-qualified name is a good choice. Note that, like Message, Exchange is a StringMap and has generic put/get methods taking a Class as the key that give you compile-time type safety and save you having to cast:

theExchange.put(MyCustomObject.class, new MyCustomObject());
MyCustomObject myObj = theExchange.get(MyCustomObject.class);