Implementation Continued II
For this example (running a physics program), we could use a specific machine as defined on previous foil (the Windows NT PC maryland) or a generic machine <run domain=“any” machine=“any” type=“pc” os=“nt” >
In this case, middle tier broker, would look in a database (XML file) to find what machines were available and either automatically or with user input choose one.
Both Software and Hardware are defined in XML
Note databases and an XML files are logically equivalent
JDBC can access either Oracle (Microsoft) database or XML ASCII file
More generally XML can be thought of as general object serialization
- A database table is one type of object