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Service combination instance migration effectiveness judgment method based on dynamic dependency graph

A dynamic dependency graph and service combination technology, applied in data processing applications, computing, resources, etc., can solve problems such as not considering data irrelevance

Active Publication Date: 2014-02-26
NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although this method has made some relaxations to the original "trajectory reconstruction" technique, it does not consider the data irrelevance between activities, so the method is still relatively conservative

Method used

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  • Service combination instance migration effectiveness judgment method based on dynamic dependency graph
  • Service combination instance migration effectiveness judgment method based on dynamic dependency graph
  • Service combination instance migration effectiveness judgment method based on dynamic dependency graph

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Embodiment Construction

[0050] Such as figure 1 , figure 2 As shown, according to a preferred embodiment of the present invention, the method for judging the validity of service composition instance migration based on the dynamic dependency graph takes the service composition before and after evolution, and the executed path (i.e., the sequence of executed activities) of the instance to be migrated as input , taking the migration validity judgment result of the instance to be migrated as the output, such as figure 2 As shown, its specific implementation includes the following steps:

[0051] Step 1. Analyze the dependencies between activities in the executed path of the instance to be migrated, automatically generate the dynamic dependency graph of the executed path, that is, the dynamic dependency graph of the instance to be migrated, and obtain all reachable A collection of reaching definitions of variables;

[0052] Step 2. Reduce the dynamic dependency graph: through the method of backward d...

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Abstract

The invention provides a service combination instance migration effectiveness judgment method based on an executed path dynamic dependency graph. A service combination before and after an evolution, and an executed path of an instance to be migrated act as input, and migration effectiveness judgment results act as output. Realization of the method comprises the following steps: dependency relationship among activities in the executed path of the instance to be migrated is analyzed, a dynamic dependency graph of the executed path is generated and a set of all reachable variable definitions reaching the end of the executed path is obtained; the dynamic dependency graph is reduced via a backward dynamic slicing method; a control flow graph of the service combination after the evolution is obtained; whether a topological ordering, which is an activity sequence of the service combination after the evolution, exists is judged on the basis of the control flow graph of the service combination after the evolution and the dynamic dependency graph after reduction, and if the topological ordering exists, migration effectiveness is met; or the migration effectiveness is not met. A false negative probably generated by utilizing a conventional method can be avoided by utilizing the method so that the dynamic evolution of the service combination is better supported.

Description

technical field [0001] The present invention relates to the technical field of service computing, in particular to the determination of the validity of service composition instance migration, in particular to a method for determining the validity of service composition instance migration based on the dynamic dependency graph of the executed path, which is suitable for determining the service composition before evolution Whether the instances generated under the composition process definition and not finished can be safely and effectively migrated to the specific state definition of the evolved service composition process to continue execution. Background technique [0002] With the development of distributed object technology and XML technology, Web service technology appears and becomes mature. Web service is an effective mechanism for data and information integration on the Web. By adopting XML-based standards and protocols such as WSDL, UDDI, and SOAP, problems such as co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06
Inventor 宋巍陈先博张功萱
Owner NANJING UNIV OF SCI & TECH
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