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Putting a dog tag at the beginning of the memory block you ve allocated allows you to check for redundant attempts to deallocate the memory block without needing to maintain a list of all the memory blocks you ve allocated. Putting the dog tag at the end of the memory block allows you to check for overwriting memory beyond the location that was supposed to be used. You can use tags at the beginning and the end of the block to accomplish both objectives. You can use this approach in concert with the reasonableness check suggested earlier checking that the pointers are between StartData and EndData. To be sure that a pointer points to a reasonable location, rather than checking for a probable range of memory, check to see that the pointer is in the list of allocated pointers. You could check the tag field just once before you delete the variable. A corrupted tag would then tell you that sometime during the life of that variable its contents were corrupted. The more often you check the tag field, however, the closer to the root of the problem you will detect the corruption.

When this method is called, all the serializable fields will be set correctly, and they may be accessed to perform any additional work that would be necessary to fully deserialize the object Invoking these methods in reverse order is important because it allows inner objects to finish their deserialization before the outer objects that contain them finish their deserialization For example, imagine a collection object (like Hashtable or Dictionary) that internally uses a hash table to maintain its sets of items The collection object type would implement a method marked with the OnDeserialized attribute Even though the collection object would start being deserialized first (before its items), its OnDeserialized method would be called last (after any of its items OnDeserialized methods) This allows the items to complete deserialization so that all their fields are initialized properly, allowing a good hash code value to be calculated .

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Add explicit redundancies An alternative to using a tag field is to use certain fields twice. If the data in the redundant fields doesn t match, you know memory has been corrupted. This can result in a lot of overhead if you manipulate pointers directly. If you isolate pointer operations in routines, however, it adds duplicate code in only a few places. Use extra pointer variables for clarity By all means, don t skimp on pointer variables. The point is made elsewhere that a variable shouldn t be used for more than one purpose. This is especially true for pointer variables. It s hard enough to figure out what someone is doing with a linked list without having to figure out why one genericLink variable is used over and over again or what pointer->next->last->next is pointing at. Consider this code fragment:

Then, the collection object creates its internal buckets and uses the items hash codes to place the items into the buckets I show an example of how the Dictionary class uses this in the upcoming Controlling the Serialized/Deserialized Data section of this chapter ..

void InsertLink( Node *currentNode, Node *insertNode ) { // insert "insertNode" after "currentNode" insertNode->next = currentNode->next; insertNode->previous = currentNode; if ( currentNode->next != NULL ) { currentNode->next->previous = insertNode; } currentNode->next = insertNode; }

If you serialize an instance of a type, add a new field to the type, and then try to deserialize the object that did not contain the new field, the formatter throws a SerializationException with a message indicating that the data in the stream being deserialized has the wrong number of members . This is very problematic in versioning scenarios where it is common to add new fields to a type in a newer version . Fortunately, you can use the System.Runtime.Serialization.OptionalFieldAttribute attribute to help you . You apply the OptionalFieldAttribute attribute to each new field you add to a type . Now, when the formatters see this attribute applied to a field, the formatters will not throw the SerializationException if the data in the stream does not contain the field .

You define the WindowsCalculator project in a fashion similar to the Framework project, but you extend the trigger repository. You re performing an ordinary CI build every 30 seconds and also checking whether a dependent project has completed its build B. If so, you fire the build for WindowsCalculator as well. Think of distributing your projects onto more machines. CCNet lets you distribute projects indirectly. This means you don t have one centralized server that is managing build processes; you can couple several CCNet instances (we ll discuss this more in chapter 12). For example, if the Framework project is built on a separate machine, you can provide the additional attribute serverUri to the project trigger like this:

This is traditional code for inserting a node in a linked list, and it s needlessly hard to understand. Inserting a new node involves three objects: the current node, the node currently following the current node, and the node to be inserted between them. The code fragment explicitly acknowledges only two objects insertNode, and currentNode. It forces you to figure out and remember that currentNode->next is also involved. If you tried to diagram what is happening without the node originally following currentNode, you would get something like this:

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