从Mule ESB上的Java会话中读取变量

Question

im developping a bookstore in Mule ESB and i need how can i read a session variable in java. My case is i query on my MYSQL the price of the book. I save this result in a session variable. To print the bill, i show the list of books with quantity and the price. I need recover the value of price.

Any solution? Thanks.

Answer 1

In order to access any variables, you need to first have access to the message. This can be done by either using a transformer which extends AbstractMessageTransformer or using a component which implements Callable. Once you have that in place, you can use something similar to the one below:

public class TestComponent implements Callable {

    @Override
    public Object onCall(MuleEventContext eventContext) throws Exception {

         MuleMessage message = eventContext.getMessage();
         String sessionProperty = message.getProperty("mySessionProperty", PropertyScope.SESSION);
         ....
    }
}

Note that session properties may affect the memory, therefore you should only use them when necessary.

Answer 2

What you will need is to implement a component that implements the callable interface. From the event context you can do a get message and then get session property .