Design And Implement Of Self-defined Field Correlation Information Publish And Subscribe System Bases On Directory Service

Electricity,public health,transportation and other fields are closely related to people's life,and their production and use are related to society and environment.For example,the construction of power grid,the deployment of power supply and the input of power generation will be influenced by natural environment,urban planning and population distribution.The information contained in these relations is called field correlation Information,which has important reference for the construction of power grid,the planning of electric power,the early warning and other decision-making processes.At present,many researchers have collected,analyzed and excavated the public big data,and developed many field application systems to provide the user with field correlation information.However,there are problems such as distribution,heterogeneity and mutual understanding of in these field application systems,which lead to the field correlation information being scattered,different types of information and different information structures.Users have to invest a lot of time to fully utilize these resource information.In this context,this paper designs and implements a unified field correlation information publishing platform.Metadata technology is used to describe the field correlation information in a specification standard way,directory service technology is used to store,publish,and manage field correlation information,the platform implements the mechanism of scheduling messages.First of all,this paper puts forward a metadata description model suitable for different areas,different forms of the field correlation information,according to the characteristics and presentation forms of the different field correlation information.Field experts or institutions grasping information sources can customize the information content about a certain field according to the need,which can realize the unified,standardized publishing of the field correlation information.Directory service technology is often used to solve heterogeneous resource sharing problems.The project uses the directory service technology to realize the organization,storage,release and discovery of field correlation information.According to the description model of field correlation information based on metadata,this paper designs the directory information tree and directory schema of the field correlation information.This paper researches and implements the set of services capabilities for the directory nodes,so as to realize the integration,management and share of the field correlation information.Then,in order to ensure the timeliness and orientation of obtaining field correlation information,this paper implements the message reservation mechanism based on the publish/subscribe mode.Combined with the description model of the field correlation information,this paper puts forward two kinds of subscription mode,which is based on the theme and based on content,and use the JMS technology and ActiveMQ eventually to subscribe information and notify.Finally,this paper designs and implements the management system of field correlation information,realized the function of release,query,subscription of the field correlation information.This paper proves the feasibility and correctness of this project by the means of platform authentication.