Define a class whose instances represent request and reply messages as illustrated in Figure 5.4. The class should provide a pair of constructors, one for request messages and the other for reply messages, showing how the request identifier is assigned. It should also provide a method to marshal itself into an array of bytes and to unmarshal an array of bytes into an instance.

You can use languages like Java, etc,

Fig 5.4:

message Type requestid remote Reference operationld arguments int (O=Request, 1= Reply) int RemoteRef int or Operation // array of bytes