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Passing Mobile Objects by Reference
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There s a piece of terminology here that can get confusing. So far, I ve loosely associated anchored objects with the concept of passing by reference, and mobile objects as being passed by value. Intuitively, this makes sense, because anchored objects provide a reference, though mobile objects provide the actual object (and its values). However, the terms by reference and by value have come to mean other things over the years. The original idea of passing a value by reference was that there would be just one set of data one object and any code could get a reference to that single entity. Any changes made to that entity by any code would therefore be immediately visible to any other code. The original idea of passing a value by value was that a copy of the original value would be made. Any code could get a copy of the original value, but any changes made to that copy weren t reflected in the original value. That makes sense, because the changes were made to a copy, not to the original value.
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In distributed applications, things get a little more complicated, but the previous definitions remain true: an object can be passed by reference so that all machines have a reference to the same object on a server. And an object can be passed by value, so that a copy of the object is made. So far, so good. However, what happens if you mark an object as Serializable or DataContract (that is, mark it as a mobile object) and then intentionally pass it by reference It turns out that the object is passed by value, but the .NET Framework attempts to provide the illusion that the object was passed by reference. To be more specific, in this scenario, the object is copied across the network just as if it were being passed by value. The difference is that the object is then returned back to the calling code when the method is complete, and the reference to the original object is replaced with a reference to this new version, as shown in Figure 1-21.
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Figure 1-21. Passing a copy of the object to the server and getting a copy back The original object (instance 1) starts on the left and is copied (cloned) to the right (instance 2). The right-hand process or machine has full access to a local copy of the object and can interact with it freely. When that s done, the object is returned to the left, meaning it is copied back across the network into a new object on the left (instance 3). This is potentially very dangerous, since other references to the original object continue to point to that original object only this one particular reference is updated. You can end up with two different versions of the same object on the machine, with some references pointing to the new one and some to the old one.
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If you pass a mobile object by reference, you must always make sure to update all references to use the new version of the object when the method call is complete.
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You can choose to pass a mobile object by value, in which case it s passed one way: from the caller to the method. Or you can choose to pass a mobile object by reference, in which case it s passed two ways: from the caller to the method and from the method back to the caller. If you want to get back any changes the method makes to the object, use by reference. If you don t care about or don t want any changes made to the object by the method, use by value. Note that passing a mobile object by reference has performance implications it requires that the object be passed back across the network to the calling machine, so it s slower than passing by value.
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