HelloWorld Asynchronous
Conceptually what will happen in this asynchronous example is
HelloWorldPublisher will "publish" the asynchronous service and
HelloWorldSubscriber will "subscribe" to the service. The steps
to do this are:
- Define the service interface -
HelloWorldServiceAsynchronous.java
- Create a publisher of the service -
HelloWorldPublisher.java
- get a reference to the component
- publish the service
- Create a subscriber of the service -
HelloWorldSubscriber.java
- get a reference to a component
- subscribe to the service (ie: implement the interface)
1. HelloWorldServiceAsynchronous
Source code: 
HelloWorldServiceAsynchronous.java
The HelloWorldServiceAsynchronous is
- the service interface that has been defined
Like the HelloWorldServiceSynchronous
interface, the HelloWorldServiceAsynchronous interface is very
simple. However, there are two main differences between them.
The helloWorld() method in the HelloWorldSynchronous
interface returns a String, whereas the helloWorld()
method in the asynchronous interface does not. Also, the same
method in the synchronous interface includes no parameters, while
the method in the asynchronous interface includes a parameter,
String hello.
void helloWorld (String hello) throws RemoteException;
These differences are due to how synchronous and asynchronous
connectors work. See the Connector
Generation section for more on this.
The HelloWorldServiceAnsynchronous interface in its entirety
is linked above. This interface is implemented by HelloWorldSubscriber and
the "Hello World!" messages are created by HelloWorldPublisher.
Next: HelloWorldPublisher
