Implementation method of loosely coupled flow
A loosely coupled, process-based technology, applied in the field of computer processes, can solve problems such as difficult to effectively support process backtracking, difficult to read and understand Boolean expressions, and changes in upstream and downstream relationships
Inactive Publication Date: 2011-08-24
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology
[0003] 1. There is a strong coupling relationship between upstream and downstream nodes, and dynamic changes cannot be made in the process
The traditional process model-based workflow design method requires pre-customized process templates, in which the upstream and downstream sequence of each process node is clearly specified, and the workflow is executed strictly in accordance with the order in which it is executed. If the upstream nodes are not completed Tasks cannot carry out work on subsequent process nodes, let alone dynamically add and delete process nodes during process operation, or change their upstream and downstream relationships, which has great limitations
[0004] 2. Simple judgment of true and false conditions cannot effectively express the complex upstream and downstream dependencies between nodes
In the traditional process model-based workflow design method, one or more Boolean expressions of process variables are usually used to realize the jump or branch of process nodes, but this method is difficult to effectively support complex patterns such as process backtracking and process looping , and if the judgment condition is too complex, when the number of process nodes exceeds a certain number, the conditional judgment Boolean expression will become difficult to read and understand due to the introduction of too many variables
Method used
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[0027] A specific example is as follows:
[0028] XML definition file design
[0029] The format of the XML definition file for a loosely coupled computer process is described as follows:
[0030]
[0031] Instance tag: used to describe a workflow instance, each Instance tag can contain a Nodes tag and a Lines tag. The Id attribute in the Instance tag is used to uniquely identify a workflow instance; the Name attribute is used to store the name of the workflow instance; the Type attribute is used to describe the type of the workflow instance, for example: 1-level process, 2-level process, etc.; the IsActive property It is used to describe whether the workflow instance is currently activated, only the activated process can be used in the system, and the inactivated process instance will not be used;
[0032] Nodes label: All Node labels must be placed inside the Nodes label;
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The invention discloses a method for the implementation of loosely coupled flow, which comprises the following steps of: 1, analyzing an XML (Extensible Markup Language) format-described flow defining file and importing the file in a flow database; 2, extracting information from the flow database, correctively constructing a flow information memory object used by a flow information exhibition control, maintaining and managing the flow information, and saving the modifications in the memory object in the flow database; 3, automatically drawing a flow figure by using the given flow information memory object according to the flow information and setting a chaining address of detailed flow information, and dynamically exhibiting flow node associate detail on a flow exhibition interface; and 4, exporting relevant information in the flow database as an external XML format file.
Description
technical field [0001] The invention relates to a method for realizing a computer flow in a database system, in particular to a method for realizing a loose coupling flow. Background technique [0002] The traditional process model-based process design method needs to pre-customize the process template to form a fixed upstream and downstream relationship of process nodes, and realize limited upstream and downstream relationship changes through simple true and false condition judgments. The traditional method of process design based on process model has the following problems: [0003] 1. There is a strong coupling relationship between upstream and downstream nodes, which cannot be dynamically changed in the process. The traditional process model-based workflow design method requires pre-customized process templates, in which the upstream and downstream sequence of each process node is clearly specified, and the workflow is executed strictly in accordance with the order in w...
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IPC IPC(8): G06F17/30
Inventor 王嘉春谢政刘霞赵伶丰曹瑞强
Owner BEIJING INST OF SPACECRAFT SYST ENG