| Along with grid, the technical research that springs up and develops promptly and serves for grid information is also gone deep into more with extensive. Grid information service is grid most important support one of technologies, grid information service in grid system in undertake the existence of grid resource sexual and its property describe , the management of grid resource life period, grid resource information collect and issue , offer unification just effective grid information to visit interface as well as the state for the grid of development change carry out the grid basicness functions such as monitoring. On the other hand, the importance of grid information service gets embodiment from the demand of customer's both sides and the owner of grid resource. It is simple that a grid information service system can compare , it can be also very complex, this depends on the function complexity of specific grid that it supports. But grid information service system must offer some kinds of most basic functions: Information is registered , information inquiry and information update , information and the distribution type management of information from suit to duplicate visit safely control with face last user visit interface. In past few years, with open grid service architecture ( OGSA ) to mark , grid technology becomes mature and is standardized , it is a acting grid architecture that OGSA ( Open Grid Services Architecture ) are called as , it is to, on the original foundation of " five levels of hourglass structure ", combine newest technical OGSA of Web Service that puts forward to include two crucial technical grid technologies ( for example Globus software ) with the technology of Web Service. Globus assembly is GRAM grid resource allocation and management agreement and the service of entrance guard, they have offered safety reliable service to found and manage function, first directory services offers information discovery function through soft state registered, data model as well as local registration, GSI supports to be unitary to register , represents and trusts to shine upon. These functions have offered the necessary element that faces service structure. With service as center it is that the basically ideological everything of OGSA in OGSA is service , it is more broad to serve the concept indicated, include various calculations resource , stock resource, network, program and database and so on, in OGSA realization will is for service share. From resource to service, is this kind of and abstract , unify resource, information and data etc. , it is flexible to be very much helpful , consistent , dynamic share machine made realization, make distribution type system manage to have got behavior and the interface of standard. To make the thought of service more definite and specific, OGSA has defined " grid service " ( Grid Service ) concept. Grid service is a kind of Web Service, the definition that this service has offered a group of interface and these interfaces is made clear and comply with specific usual practice , solve service discovery and development service to found , the problems such as life period management and notice. The core of Web Service is in big different Gou network general various applications join , have the aid of in Web standard UDDI, WSDL and XML/SOAP etc. will Internet from a communication network develop a application platform further. After more and more Web Services realize the various features of application will along with change. Apply somewhat can basis needs or is the function that basis can get , from the service that can get come development structure. In OGSA, serve everything as grid, therefore grid is the set of grid service that can be expanded , it can assemble with different way the needs that satisfy fictitious organization if grid serves , fictitious organization self can also define partially according to their service that operated and shared. In OGSA also pay attention seriously mutual operatingness, but from the viewpoint of service OGSA will mutual operatingness problem transformation is two subproblems, identification activation and the interface of definition service specify the agreement of interface. In grid environment, all assemblies are fictitious , therefore pass through the key interface that offers a group of relative unification , all grid services realize based on these interfaces, the different function of OGSA is realized by the interface of different grid service , can construct very easily to issue the service of higher rank that has hierarchy , these services can stride across different abstract level, with the way of a kind of unification treat. Fictitious melt also make will many logic resource examples shine upon identical physical resource on become possibility, when making up for serving to go on, need not consider specific realization , can be basic with bottom resource composition , carry out resource management in fictitious organization. Pass through grid service fictitious melt , can behavior and the service semantic of be general , shine upon the local infrastructure of platform without seam over. Paper reference, now on world about the newest research accomplishment of grid information service, designs and realizes the Jilin province accomplishment information service system of science and technology that popularizes information platform , has introduced the accomplishment of science and technology to popularize information service platform physical structure, the accomplishment of science and technology popularize information service platform development construction goal, with the information with OGSA as the crucial partial news handlings of architecture issue , realization and the designs such as long-range registration. Detailed design the news handling of the platform of science and technology, include Client end to Server end dispatch seek service request news; To search for service, the agency between Server and Server seeks service to ask news; After Server searches for service, to get online Server list, is online as dispatching , is away from line news between the result news as well as Serverand Server that Client asks to return with land news, the Server list news that transmits in addition between Server is expressed specificly for the realization of " news ", the case of " news ", the body of " news " ( MsgBody ) realization "news" spread , overall situation is synchronous to serve list. Secondly, have given the architecture based on OGSA , have put forward the organization of grid information and stock model, have described grid information collect and register , inquiry and index , book , the functions such as invitation. And have given the service platform based on OGSA to realize scheme and integrated Eclipse in GT3 based on OGSA realization grid information service, in which the EchoString grid service that includes realizing to inform function , OGSI has defined the notice of grid service, is machine made , it will news issue service interface is called as NotificationSource, will news take over service interface is called as NotificationSink. As well as service end development, include offering service interface , serve realization , serve disposition file. With customer end development, it ,including a subscription service example found customer district , are formed by grid service vessel view and grid service view, the service owned in GT3 vessel in vessel registered service, through visiting , this service can get the service that registered in this service vessel, found service example, example view have added the program that how to use grid service example , realize echostring service use , is used to carry out customer end to use. Paper final for OGSA have carried out simple summary, along with the development of related technical and grid application, raising is systematic but development, make it offer more shape the entity information that melts , and under the condition that condition allows go to its development the scope of wide area and new work, OGSA must be more mature and perfect.
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