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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.

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.

instance variables that are not marked transient. Is your object large Do you really need all that data to be shipped

it by stepping into the deserialization process The process of implementing your own private readObject() method can help. (Think of a private readObject() as kind of like a constructor, except instead of constructing an object for the first time, the private readObject() is involved in reconstructing the object following serialization.)

different niche markets), you can also use the promotional boxes to link buyers to your other eBay Stores. Promotional boxes are the perfect marketing feature for cross-promoting all of your eBay businesses in each of your stores. You can create these boxes to show up in your store header and/or in the left-hand navigational toolbar. Just like the store templates, promotional boxes can be as simple as you want or as complex as you choose to make them. They can include graphics, clickable links, custom colors, and text. To create your own promotional box, click the link for Promotion Boxes from the left menu of your Manage Your Store page.

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Do you have any final transient variables Be careful! If you use blank finals,

you re in big trouble because the variable will come back to life with a default value since the constructor won t run when deserializing an object. And since it s final, you ll be stuck with that value.

Have you thought about versioning issues When an object is serialized,

remember, the class needs to be present at the location where the object is being deserialized. What happens if the class has been modified Will the

object still be usable if it was serialized from one version of the class and deserialized using a different version Consider declaring an explicit serial version ID in all your serializable classes to reduce versioning issues.

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client does a lookup in the RMI registry, remember, it s the stub object that gets shipped, and the client will need it. Dynamic code downloading is by far the coolest and most flexible, but unless your project specification appears to need it, it may well be more work than you need to provide.

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