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Remote Procedure Call (RPC) We ll now discuss the third type of function call most commonly known as remote procedure call (RPC) or client/server architecture. RPC further developed the concepts introduced in the last section to enable calls to be

4

Remote Procedure Call (RPC)

Next, you have to pack up the item (this is harder than it sounds with all the different-shaped items and how fragile some items are) Then you have to hope the item isn t damaged or lost in shipment Ten percent of the time you have to fight with the winner because the outside of the shipping box was damaged, the item is okay, but still you owe me a partial refund , or there is a small scratch which wasn t shown in the pictures, I want a refund or I will leave you negative feedback and on and on and on Finally you have to write a check out to the person who dropped off the items.

made to applications running on separate hosts and connected by a network. RPC introduced for the first time, although in a rudimentary way, the declaration of the service interface. RPC also introduced the concept of marshalling and unmarshalling of parameters, which is required for communication over the network. In addition, RPC further developed the idea of a runtime library so as to include calls to the kernel that involve network routines. We describe how RPC works with a view toward these new concepts. Therefore, we will consider an example similar to the one discussed in the last section on Doors. The server will expose a function for the client applications to call, which will take as an input a long integer and return the cube of the input to the caller.

IP Multicast is another method that can be used in some cases. The address then becomes sip:mcast.net, which then gets routed to the IPv4 address of 224.0.1.75. The proxies within the network then are responsible for routing to the correct location according to the method REGISTER. A typical REGISTER message would look something like the next example. Notice that the TO and the FROM headers are the same. Also notice that the request-URI only contains the domain, since the message is not being routed to another subscriber or application server.

We begin with the discussion of interface declaration. RPC introduced a rudimentary way of defining an interface between the client and the server through the use of a specification file. The RPC specification file may be considered the first step in the development of the services interface (for example, WSDL files) in today s world. A configuration file (cube.x) for the example covered here is provided in Listing 4-3. This file is used to generate the skeleton code for both the server and the client using a tool such as rpcgen. Note that the specification is written in a specific language, such as C, and therefore requires both the server and the client to be written in the same language.

REGISTER sip: tcg.com SIP/2.0 TO: travisruss@tcg.com FROM: travisruss@tcg.com CONTACT: travis.russell@135.18.10.10 CALL-ID: 82163456@tcg.com CSeq: 1001 REGISTER

Of course, one or two or three weeks later you might see a chargeback by PayPal or your merchant account and then have to spend more time proving that you shipped the item, your customer received it, and everything is as it was supposed to be David isn t giving up on eBay, but he admits he is tired of it And with the flexibility of a true entrepreneur, he s used eBay to launch himself into a new career I will certainly start doing eBay again, he says However, it won t be for a while and I will only do items that are extremely profitable..

Listing 4-3