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A broadcast is a datagram sent to a "broadcast address" A broadcast address is an IP address whose host portion is all 1's, meaning all hosts in the subnet: in a Class C subnet, whose netmask is 2552552550, the broadcast address would be ABC255, where A, B, and C are the Class A, Class B, and Class C parts of the network address An RMI broadcast server would be a small further development of the datagram server described above
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1741 Purpose An RMI broadcast server is largely indistinguishable from a datagram server It would function most probably as a replicated server in a Class C or smaller subnet Instances of the same RMI remote object would be executing at several hosts in the subnet All instances would receive RMI calls directed at the subnet Obviously UDP broadcasts are cheap to implement but rather drastic in their effect on the network The UDP Multicast facilities have largely superseded the functions of UDP broadcasts 1742 Semantics The semantics of a broadcast remote call are similar to those of a datagram remote call the call has been executed "at least zero times" except that replies may be received from every member of the subnet Most probably, an RMI broadcast server would adopt the semantics of not replying at all on failure, only replying on success, following the example of the 1983 1984 Sun RPC package 1743 Implementation The only difference between a datagram server and an RMI broadcast server is the fact that the latter is addressed by a broadcast address rather than a specific host address All that an implementation would require would be a way of getting the broadcast address into the stub The elaboration of this is left as an exercise for the reader
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175 Clients
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It is important to note that apart from the addition of some call controlling mechanism, the clients of the servers described in this chapter would be largely oblivious to the server type The reason for this is that in RMI "the stub is the protocol" Once a client has acquired a remote stub it just executes method calls It doesn't have to be at all aware of the protocol implemented by the stub
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176 Exercises
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1:Design a DatagramRemoteObject class, including methods to control timeouts and retries 2:Design a BroadcastRemoteObject class, including methods to control timeouts and retries 3:Design a MulticastRemoteObject class, including methods to control joining and leaving multicast groups, and to control the TTL of messages
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18 Selected further topics
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Distributed garbage collection Logging Debugging Testing RMI in a single machine Performance RMI and JDK versions Exercises
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181 In this chapter
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In this chapter we discuss some selected further topics in RMI: DGC, logging, debugging, performance, efficiency, and the usability and interoperability of RMI under different versions of Java and JDK
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182 Distributed garbage collection
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You really don't need to know much about distributed garbage collection (DGC) in RMI, except that it exists The interfaces and classes defined in the package javarmidgc are used by the DGC subsystem, not by developers 1821 Overview Consider a client which acquires a remote reference to an RMI server As we saw in 15, a remote reference is initially obtained from a naming service, typically the RMI registry or a JNDI service The client then executes zero or more remote method calls via this reference, and eventually releases the reference, probably by releasing an object which contains it, allowing the remote reference to be locally garbage collected in the client JVM At this point in the client's execution, we would like a protocol to notify the remote JVM that this client no longer has any references to the remote object This is what DGC does 1822 Description RMI implements a DGC protocol which keeps track of remote references references to remote objects and notifies the remote JVM when a remote reference has been released[1]
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