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JSON-WSP is an RPC protocol that uses JSON-encoded messages.JSON-RPC is an RPC protocol that uses JSON-encoded messages.XML-RPC is an RPC protocol that uses XML to encode its calls and HTTP as a transport mechanism.Modula-3's network objects, which were the basis for Java's RMI.Java's Java Remote Method Invocation (Java RMI) API provides similar functionality to standard Unix RPC methods.The most common tool used for this is RPCGEN.
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The IDL files can then be used to generate code to interface between the client and server. Most of these use an interface description language (IDL) to let various platforms call the RPC. To let different clients access servers, a number of standardized RPC systems have been created. The reply traces the same steps in the reverse direction. Finally, the server stub calls the server procedure.Unpacking the parameters is called unmarshalling. The server stub unpacks the parameters from the message.The local operating system on the server machine passes the incoming packets to the server stub.The client's local operating system sends the message from the client machine to the server machine.Packing the parameters is called marshalling. The client stub packs the parameters into a message and makes a system call to send the message.The call is a local procedure call, with parameters pushed on to the stack in the normal way. Idempotent procedures (those that have no additional effects if called more than once) are easily handled, but enough difficulties remain that code to call remote procedures is often confined to carefully written low-level subsystems. Also, callers generally must deal with such failures without knowing whether the remote procedure was actually invoked. There are many variations and subtleties in various implementations, resulting in a variety of different (incompatible) RPC protocols.Īn important difference between remote procedure calls and local calls is that remote calls can fail because of unpredictable network problems. While the server is processing the call, the client is blocked (it waits until the server has finished processing before resuming execution), unless the client sends an asynchronous request to the server, such as an XHTTP call. The remote server sends a response to the client, and the application continues its process. Message passingĪn RPC is initiated by the client, which sends a request message to a known remote server to execute a specified procedure with supplied parameters. The first popular implementation of RPC on Unix was Sun's RPC (now called ONC RPC), used as the basis for Network File System. One of the first business uses of RPC was by Xerox under the name "Courier" in 1981.
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Bruce Jay Nelson is generally credited with coining the term.
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The idea of treating network operations as remote procedure calls goes back at least to the 1980s in early ARPANET documents.