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Chapter 5 Invocation, Invocation Semantics: Failure Model Local invocations are executed exactly once, this cannot always be the case for remote method invocations. RMI, RMI Main Choices: Combinations of these choices lead to a variety of possible sematics for the reliability of remote invocations as seen by the invoker Retransmission of Results: whether to keep a history of result messages to enable lost results to be retransmitted without re-executing the operations at the server, RMI Main Choices: Combinations of these choices lead to a variety of possible sematics for the reliability of remote invocations as seen by the invoker Retry-Request Message: whether to retransmit the request message until either a reply is received or the server is assumed to have failed, Invocation Semantics: Failure Model At-Least-Once the client gets a result (and the method was executed at least once) or an exception (no result), RMI Main Choices: Combinations of these choices lead to a variety of possible sematics for the reliability of remote invocations as seen by the invoker Duplicated Filtering: when retransmissions are used, whether to filter out deplicate requests at the server, Invocation Semantics: Failure Model Maybe, At-Least-Once and At-Most-Once Can suffer from crash failures when the server containing the remote objects fails