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The trick is to remember that the .NET Framework creates instances two ways. Normal creation of an instance invokes the constructor of each class in the inheritance hierarchy, but deserialization (when using the BinaryFormatter or NetDataContractSerializer) doesn t invoke any constructors. Fortunately, the BusinessBase and ReadOnlyBase classes include code, so they are notified when they are deserialized. In that case, they invoke a Protected method called OnDeserialized(), which a business class can override to be notified that it has been deserialized. Using this capability, you can force initialization of the Shared fields in a class by adding the following code to any custom base class: <Serializable()> _ Public MustInherit Class CustomBase(Of T As CustomBase(Of T)) Inherits BusinessBase(Of T) Private Shared _forceInit As Integer Protected Sub New() _forceInit = 1 End Sub Protected Overrides Sub OnDeserialized(ByVal context As StreamingContext) _forceInit = 1 End Sub End Class When an instance of this class, or a subclass, is created normally, the constructor is invoked. The constructor accesses the Shared field and ensures that all Shared fields are initialized. When an instance is created through deserialization, OnDeserialized() is invoked, which again accesses the Shared field and ensures that all Shared fields are initialized. This technique requires a bit more code, but it doesn t incur the performance penalty of implementing a Shared constructor. Regardless of which technique you use, the end result is that the Shared fields declared in each class are initialized before any properties can be accessed. This ensures that all the RegisterProperty() calls occur and that all properties are registered early in the process.

SELECT x, STDDEV(w) FROM table GROUP BY x HAVING x > MIN(z) OR x < MAX(y) ORDER BY y DESC LIMIT 10 OFFSET 3; If you are already familiar with SQL, imagine coding the equivalent of a subquery, compound query, GROUP BY clause, or multiway join in your favorite (or not so favorite) programming language. SQLite embeds all of this functionality into your application with minimal cost. With a database engine integrated directly into your code, you can begin to think of SQL as an offload engine in which to implement complex sorting algorithms in your program. This approach becomes more appealing as the size of your data set grows or as your algorithms become more complex. What s more, SQLite can be configured to use a fixed amount of RAM and then offload data to disk if it exceeds the specified limit. This is even harder to do if you write your own algorithms. With SQLite, this feature is available with a simple call to a single SQL command. SQLite is also a great learning tool for programmers a cornucopia for studying computer science topics. From parser generators to tokenizers, virtual machines, B-tree algorithms, caching, program architecture, and more, it is a fantastic vehicle for exploring many well-established computer science concepts. Its modularity, small size, and simplicity make it easy to present each topic as an isolated case study that any individual could easily follow.

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The PropertyInfoManager is a Module that is responsible for managing all the properties that have been registered for each business object type using the RegisterProperty() method. This type is found in the Csla.Core.FieldManager namespace. Each time RegisterProperty() is called, it is associating an IPropertyInfo object with a specific business object type. For each business object type, PropertyInfoManager maintains a list of IPropertyInfo objects that describe the properties registered for that type. This means that it also has a list of all the business object types, which is maintained in a Dictionary, as you can see in the PropertyInfoManager code: Private _propertyInfoCache As Dictionary(Of Type, List(Of IPropertyInfo)) This Dictionary is indexed by a Type object, representing the type of each business object with registered properties. The value is a List of IPropertyInfo objects, each containing metadata about a property registered to that type. The hard part about this module is that its methods need to be thread-safe. In many cases, it will be used in a multithreaded environment, such as in ASP.NET, so access to this Dictionary and to each individual List object must be wrapped with locking code. The PropertyInfoCache property does this for the Dictionary itself: Private _cacheLock As New Object() Private ReadOnly Property PropertyInfoCache() As _ Dictionary(Of Type, List(Of IPropertyInfo))

Note If you implement hardware-based load balancing, you may experience issues using the TCP protocol, because the pooling of TCP connections by the load balancer may lead to an uneven availability of connections between services, which could interrupt messages. You should consider software load balancing for your Web services solutions or, better yet, avoid load balancers and implement a routing-based manager to direct service calls for you. Routing and referral is discussed in detail in this chapter in the section titled Overview of Routing and Referral.

Get If _propertyInfoCache Is Nothing Then SyncLock _cacheLock If _propertyInfoCache Is Nothing Then _propertyInfoCache = New Dictionary(Of Type, List(Of IPropertyInfo))() End If End SyncLock End If Return _propertyInfoCache End Get End Property The Private field _cacheLock is used to lock the region of code that creates the Dictionary if it doesn t already exist Notice how the code checks the existence of the Dictionary both before and after the SyncLock statement This avoids a race condition, where multiple threads could wait on the lock and run the code inside the lock, even though the first thread to reach that point would have already created the Dictionary.

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