The client communicates with an RMI, and the RMI responds to the client by sending an update to the client's current state. We assume the client is communicating using a text-only Internet protocol (IP). Now, we can ask the RMI, for example, for an instruction to transfer a copy of one of the program variables, an int variable, as its value to a memory location, by using a message. The RMI returns, “Transfer the number 123 to a memory location. “ RMI: Transfer 123 to memory location This message indicates the communication is finished; we then wait for an “OK” response from the RMI in order for the transfer to be completed. The response, in Mozart-Oz, should indicate the state of the RMI: OK if the RMI received the command successfully; otherwise, it indicates the reason why it could not execute the command: FAIL (failure; cannot be transferred). The following message will then be sent to the assistant: Transfer 123 to memory location FAIL (the message indicates the communication may be interrupted at this point.)
In the context of a die lease programming language, our problem can be expressed as: “In order to transfer 123, the RMI must receive the command. However, the RMI cannot receive the command unless the pointer to the current state has been updated and the correct pointer to the past state is provided in the transfer command. Otherwise, the pointer to the past state will be ignored, which will cause a transfer error. “ When we implement such a language in Mozart-Oz, we will create two “sensors”; one to indicate the current state, and one to show the past state. The “state sensor” is simply the memory location (i.e. pointer to a memory location, not pointer to a pointer). The “past sensor” is a value that will be added to the current value. Since we are sending the state sensor as a value of a memory location, and since the pointer to the past state is a value of the pointer to a memory location, when we transmit the message in Mozart-Oz, the RMI will read the memory location indicating which of the two past values was included in the command. The program will then execute, transferring 123 to the memory location pointed to by the pointer to the past state.
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LSINF2345 Lab 2: RMI, failure detector and client-server 1. Ping-Pong Call the assistant and demonstrate your ping-pong application. If you are planning to use a die rent programming language, other
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