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2. The use of the word “DBMS” here is a simplification. In fact, frameworks can be made for a wide range of programming environments or underlying architectures (middleware), that supports the application. The design described here, originally focused on distributed object management systems like ANSAware.

class AccountRef public ObjectRef {

public:

AccountRef(AccountRef&);

~AccountRef();

AccountRef& operator = (AccountRef&);

...

int Credit(Real);

int Debit (Real);

Real balance();

};

// bind // unbind // unbind + bind // invoke “Credit”

// invoke “Debit”

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MGMT-CLASS PlanetServer = BEGIN

VAR nodename : STRING;

VAR path : STRING;

VAR program : STRING;

VAR arg : STRING;

ACTIVATOR = Factory (nodename, path, program, arg);

PASSIVATOR = Capsule;

NOTIFICATION;

END;

MGMT-CLASS Planet = BEGIN

SERVER : PlanetServer;

VAR name : STRING;

VAR pos : INTEGER;

ACTIVATOR = Capsule (“Planet”, “%name, %pos”);

PASSIVATOR = Object;

PASSIVATION AFTER 120;

END;

PERMANENT pserv = PlanetServer (“odslab2”, “/usr/local/bin”, “pserver”, ““);

PERMANENT world1 = Planet (pserv, “Jupiter”, 5)EXPORT;

PERMANENT world2 = Planet (pserv, “Saturn”, 6) EXPORT;

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