A DAC represents a topic, and in order to access such a DAC
from a process, a proxy must be created. This requires an argument
denoting the name of the topic represented by the DAC. Except for that topic name,
the action of creating a DAC proxy is identical to creating a local
collection.
The DAStrongSet collection class instantiated in
Figure 13 offers reliable delivery of notifications
to subscribers. The instance called myChat henceforth provides
access to the topic /Chat/Insomnia. Now it is possible to directly publish and receive
messages for the topic associated to that DAC.
Creating an event notification for a topic consists in inserting a message object into the DAC by issuing a call to the add() method, from where it becomes accessible for any party.
...
/* connect */
DASet myChat = new DAStrongSet("/Chat/Insomnia");
/* create new message and publish it */
ChatMsg m = new ChatMsg("Alice", "Hi everyone");
myChat.add(m);
...