By Dharma Shukla
A vital home windows Workflow beginning, WF lead architects-Dharma Shukla and Bob Schmidt-offer an under-the-hood examine the know-how, explaining the why and never simply the how of WF's key ideas and structure. severe WF builders looking information about the way to successfully make the most of and expand the framework through writing actions will locate cogent reasons and solutions right here. With basic and illustrative examples, the authors show precisely find out how to leverage WF's extensible programming version to craft domain-specific courses. Drawing on their exact vantage element in designing and constructing WF, Shukla and Schmidt carry authoritative assurance of * The center techniques and ideas that shape the guts of WF's programming version * The execution version for actions, with info of the job automaton, bookmarking, scheduling, and the threading version of the WF runtime * complex execution thoughts, together with task execution contexts, transactions, patience issues, passivation, fault dealing with, cancellation, reimbursement, and synchronization * internet hosting the WF runtime in purposes * The task part version, with information of validation, compilation, serialization, and visualization * Databinding, XAML, dependency homes, and WF application metadata * Declarative stipulations and ideas, job designers, and clothier webhosting * customized regulate circulate styles starting from easy sequencing and generation to extra advanced graphs and kingdom machines * Dynamic modifying of working WF software instancesEssential home windows Workflow starting place is the definitive source for builders looking an in-depth knowing of this novel technology.Dharma Shukla is an architect at Microsoft engaged on next-generation programming types. A founding member of the home windows Workflow origin (WF) workforce, Dharma performed a key position in defining the structure of WF. Bob Schmidt is a senior application supervisor at Microsoft engaged on next-generation programming versions. due to the fact 2003, his basic concentration has been at the layout of WF. either authors were concerned with the WF venture seeing that its inception, and feature been chargeable for specifying, designing, and constructing huge parts of the expertise.
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Extra resources for Essential Windows Workflow Foundation
Sample text
Programs compiled to MSIL are ultimately translated to machine-specific instructions, but virtualization allows language compilers to target only MSIL and not worry about various processor architectures. In the WF programming model, the program statements used to build WF programs are classes that derive from Activity and CompositeActivity. Therefore, unlike MSIL, the "instruction set" supported by WF is not fixed. It is expected that many kinds of activities will be built and used in WF programs, while the WF runtime only relies upon the base classes.
7. 7. ContinueAt method returns, the WriteLine activity moves to the Closed state and the program instance completes. 60 61 WF Program Queues Any activity that requires input from an external entity must figure out a way to (a) let that external entity know that it requires input, and (b) receive notification when the input is available. This simple pattern is at the heart of episodic computation, and it is supported in a first-class way by the WF runtime. The plain requirement is that an activity must be able to receive input even if the WF program instance in which it exists is idle and sitting in persistent storage like a SQL Server database table.
This chapter began with a simple reactive program and the issues related to making that kind of program scalable and robust. Leveraging the ideas of bookmarks and continuations, we first decoupled the logic of our program from a given thread; the elimination of stack reliance, and the factoring of our program logic into distinct chunks of code, made our program resumable. We also made bookmarks available for serialization, which allowed us to passivate them; with this step, our program achieved process agility.