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CHAPTER 10 INFINITE DATA PATTERN
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else if( reference == "2" && valIdentifier == transactionIdentifier2Counter) { return true; } else { return false; } } In the implementation of IsActiveTransactionIdentifier, the parameter transactionIdentifier is from the result, where an example would be 1_101. The transaction identifier parameter is encoded and needs to be separated into two pieces; the first piece is the destination span element, and the second piece is the transaction identifier (transactionIdentifier1Counter or transactionIdentifier2Counter). The two pieces are verified, and if the destination span element references an active transaction identifier, a true is returned; otherwise, a false is returned. Returning true allows a result to be processed. If the result is processed, the destination of the result needs to be extracted by using the function GetResultField, which is implemented as follows: function GetResultField( transactionIdentifier) { var reference = transactionIdentifier.charAt( 0); if( reference == "1") { return "result1"; } EBVN else if( reference == "2") { return "result2"; } throw new Error("Invalid transaction identifier value"); } In the implementation of GetResultField, the code used to extract the field reference is identical to the code used in the function IsActiveTransactionIdentifier, and this is done for illustration purposes only. The decision block tests to see if the variable reference has the value 1 or 2, and if so returns the appropriate HTML identifier. If the variable reference is neither 1 or 2, an exception is thrown to indicate an incorrectly formatted transactionIdentifier parameter. Earlier it was mentioned that on the client side there is no reusable code because the implementation of the pattern is specific to the problem being solved. This is not entirely correct, because some pieces of the HTML client code could have been combined into a small library. The small library could be have been used in this context, but probably could not be reused in another context. An example would have been the functions IsActiveTransactionIdentifier and GetResultField. Be wary of adding small libraries of reusable code. Often there is no real advantage to using the functions because doing so does not save you much coding time or logic. It does not mean that all client-side Infinite Data implementations will be hard-coded as in the example prime number application. Some things could be abstracted, but it very much depends on the specifics of the applications that you are creating. What could be useful is the creation of helper routines. Helper routines are encapsulated pieces of code that make it quicker to implement certain functionalities. Going back to the illustrative example of functions, they could be abstracted to a set of helper functions used to create and decipher the transaction identifier. The helper
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CHAPTER 10 INFINITE DATA PATTERN
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functions should be implemented only after you have determined what a standard transaction identifier is.
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Implementing the Task Manager
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On the server side, two pieces of functionality are implemented: the task manager and the implementation of the task. In the case of the prime number algorithm, that means implementing a task to find all prime numbers. Interfaces are used so that there are no dependencies between the task manager, results, and tasks. The task manager, prime number task, and prime number result algorithms each implement one of the interfaces. The role of the task manager is to wire all of the interfaces together and provide a working solution to the Infinite Data pattern on the server side.
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Defining the Task Manager Interfaces
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There are three main interfaces for the Task Manager: ITask, ITaskManager, and IResult. The three interfaces are defined as follows: public interface ITask { long TransactionIdentifier { get; set;} void Execute( ITaskManager taskManager); } public interface IResult { string Result { get; } long TransactionIdentifier { get; } } public interface ITaskManager { void AddResult( IResult result); } The interface ITask is implemented by the individual tasks, with an example being the prime number algorithm. The ITask interface has one property and one method. The property TransactionIdentifier contains the value of the client-provided transaction identifier (for example, 1_101). The method Execute is called by the task manager to run the task. The parameter taskManager is a callback interface used by the task to save the generated results. The interface IResult is composed entirely of properties that represent the status of the result (Result) and the transaction identifier (TransactionIdentifier). The IResult interface s definition is incomplete, allowing a developer to subclass IResult by adding properties specific to the task. The idea of the IResult interface is to provide a common interface and a placeholder that can be referenced by other parts of the Infinite Data implementation without having to know the type of the result. The consumer of the IResult interface would know the different result implementations and if necessary be able to perform a type cast. The interface ITaskManager is implemented by the task manager and has a single method, AddResult. The AddResult method is used by an ITask interface instance to pass an IResult
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