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Much of the code that implements the serialization behavior described in this chapter is generated from the DSL de nition, in two les in the Dsl project called Serializercs and SerializationHelpercs The core of this code consists of a serialization class corresponding to every domain class (including relationships, shapes, diagram, connectors, and so on) For example, the domain class IssueState has a corresponding serialization class called IssueStateSerializer We will have a look at a simpli ed version of some of the methods of this class in order to get an understanding of how the serialization code is structured You only need to understand this code if you need more customization than is provided by the settings described so far
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The starting points for serialization are the Load() and Save() methods in the IssueStateModelsDocDataBase class in the le DocDatacs generated in the DslPackage project These methods are called by Visual Studio when the user opens or saves the le using the normal user interface They deal with various interactions with Visual Studio, such as ensuring that the right les exist, locking them where necessary, and posting errors At the heart of the Load() and Save() methods are calls to methods on a helper class called IssueStateModelsSerializationHelper, which is in the le SerializationHelpercs in the Dsl project Loading the model, like any changes to the store, is done in a transaction This is a special kind of transaction, called a serializing transaction, which allows links to exist in a partially instantiated state so that references can be xed up at the end of the transaction The IssueStateModelsSerializationHelper class is paired, according to the double-derived pattern for customization introduced in 3 and discussed further in 10, with a class in the same le called IssueStateModelsSerializationHelperBase that introduces several overloads of the methods LoadModel(), LoadModelAndDiagram(), SaveModel(), and SaveModelAndDiagram() Let s take a look at one of these:
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public virtual IssueStateModel LoadModel( DslModeling::SerializationResult serializationResult, DslModeling::Partition partition, string fileName, DslModeling::ISchemaResolver schemaResolver, DslValidation::ValidationController validationController)
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The rst parameter, serializationResult, collects any warning messages that are encountered during serialization The partition parameter speci es the partition, that is, the section of the store, where the deserialized model is to be created The filename speci es the le to be loaded The schemaResolver allows the loader to do XML schema validation on the model while it is being loaded and will cause any schema validation errors to be offered to the user as warnings If this parameter is null, then loading will occur without XML schema validation Similarly, if the validationController is not null, then load-time constraint validation will occur on the model, as described in 7
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The LoadModel() method creates an XmlReader to acquire the content from the le The XmlReader is one of several approaches that could have been chosen to load the le It is exible because it can read any well-formed XML content, and its performance is good However, it does require the le to be processed sequentially, in contrast, say, to reading the entire le into a Document Object Model (DOM) before processing it Having created the XmlReader, the method starts reading the le, and the rst thing it does is create in the store an instance of the domain class that is mapped to the top-level element in the le It then calls the ReadRootElement() method on the corresponding serializer class This ReadRootElement() method is only generated for serializers that correspond to root domain classes and their subclasses, because these are the only elements that can appear as roots of a model le The ReadRootElement() method rst checks the version of the le using the method CheckVersion() This can be replaced if needed; to do so, the domain class IssueStateModel must have the Generates Double Derived property set to True, which will cause its serializer also to be generated using the double-derived pattern, so that methods such as CheckVersion() can be overridden After checking the version, if passed a schemaResolver, the method sets up the XmlReader so that schema validation will occur while reading in the le If not, it sets up the XmlReader to read the le without schema validation Then it calls the Read() method, which exists for every serializer class Thus, the Read() method is called on the serializer for IssueStateModel when an instance of IssueState exists but none of its properties or embedded children have yet been deserialized At this point, the deserializer will be looking at the point in the XML just after the <issueState> element has been recognized, as marked by the symbol in this fragment of XML:
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name="Raised" description="The issue has been raised" icon="raisedico"> <successors> <issueStateTransition action="submit"> <issueStateMoniker name="StateModel/Submitted" /> </issueStateTransition> </successors> </issueState> <issueState
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