visual basic barcode printing 14: Networking Issues in Java

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14: Networking Issues
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it in an object (or group of objects) and ship it back following the same process serialize it, ship it to the client, client deserializes it and uses it in some meaningful way (most likely, presenting the Horse Cruise search results in a GUI). So now we know what form the request and result take (serialized objects), but we still need to know how to ship it from point A to point B (in other words, from client to server and from server to client). That leaves us with only one real question: do we use Sockets or RMI
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Given that Sockets are simply the end-points of a connection between two devices, you aren t limited to shipping only serialized objects over the wire. In fact, the Socket has no idea what s coming it just sees a stream of bytes. When the server gets the bytes, it s up to your server code to figure out what those bytes are supposed to mean. Are they in fact serialized objects Then deserialize them but in what order are they coming over The server needs to know. And if they re not serialized objects, the server needs to know exactly what is in those bytes, in exactly which order, so it can do the appropriate read and get the bytes into some form a little more useful (Strings, numbers, etc.). And for that, you ll need a protocol. The client code developer and the server code developer will have to get together in advance and come to an agreement on what these bytes mean, in other words, how they re supposed to be interpreted. Of course, in the Developer exam, you re writing both the client and the server, so you only have to agree with yourself.
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The beauty of RMI is that the protocol is already agreed on by both ends it s just objects moving from one place to another (copied into the new location, but we re just going to say moved because it s easier to think about). In other words, we ve already decided on the protocol for what the bytes mean, and the protocol is serialized objects. And since we ve established that, then the client and server don t even have to do the serialization/deserialization RMI takes care of it. The tradeoffs, then, are already shaping up: using Sockets lets you have whatever protocol you want, but you have to do all the heavy lifting, while using RMI restricts the protocol to serialization. But with that flexibility removed, RMI can do most of the heavy lifting. By heavy lifting, we mean things like establishing the Socket connections, packing up the bytes, sending an output stream from one place to another, then receiving it and unpacking it and so on.
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RMI is much simpler than Sockets. But simplicity never comes for free, of course, so it s also a little slower. You have to decide in all of this which is most important, but here s a hint: think Team Work. Again, there s no right answer; the assessor isn t going to prefer one over the other, because it depends on your goal and need (or in some cases, all things being equal, just which you prefer). But whichever you choose, you need to justify in your documentation (and possibly on the essay portion of the exam) why you chose one over the other. The rest of this document looks at some of the things you ll need to think about when implementing your solution. They are in no particular order, so don t infer any relative importance from the order in which they re listed.
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