Writing a netlet

public class MyNetlet implements MobileCode, Callback, ....., Serializable {

private MobileCodeStub stub = null; // Defined here but set by the MCM !

// Implement all methods of the MobileCode interface

public setStub (MobileCodeStub stub) { // Nobody but MCM should call this !

this.stub = stub;

}

......

// If you want your netlet to run, implement the Callback methods

public onStart () {

for (;;) { .... }

}

// Implement all methods of all other interfaces implemented

public aMethod (...) {

if (stub != null) {

stub.aMethod (...);

}

}

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Netlet Summary

1) Every netlet must implement MobileCode, at the least.

ie. Every netlet must implement all methods of MobileCode, notably setStub ()

2) To satisfy 1), every netlet must define a private stub;

3) If you want your netlet to run (ie. be active, not passive), you must implement Callback

NOTE : In particular, you must implement onInit () and onStart ().

4) Implementation of any interface method follows the same format as aMethod().

5) Avoid all this hassle by using SuperNetlet : Simply override onInit () and onStart () !

6) To migrate, must implement Serializable (Maybe this should be added to SuperNetlet).