Entry Service

Entry Service (ES) 3.1 is a software library for Java developers maintaining a uniform global tree of objects (entries) stored in different ways, different systems. The entire tree is accessible through any of entry service servers accessible, through one program interface, in spite of where and how the objects are stored in fact. Objects stored anywhere are subject to be published in the entry tree, which gives them unique string identifiers unchangeable even if an object is moved to another storage elsewhere. The objects can be referred using their string identifiers from within the tree's objects as well as from outside. In the first case, back references can be maintained transparently for programmers. All objects are typified; types are stored as entries in the tree too. Account-based security on per-entry level is supported. After publication, all the objects become accessible though any of entry service servers existing, through one general interface, for reading as well as modification. All the servers provide the same view on data transparently; the servers form a DNS-like subordination hierarchy and communicate in peer-to-peer manner.

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Distributed Refreshable Objects 3.1 used adds more flexibility and efficiency to ES 3.1: a bunch of remote calls are collected and sent as one package through network; all remote entries are cached on client side and resource-intensive calculated entry properties are cached everywhere with no stale data possible; subscription on entry changes is possible.

All this is done with no any messaging server necessary (peer-to-peer communication takes place), gives very high scalability of the entry tree and possibility to use it in global scope.

Entry Service is a product that provides centralized access to distributed data. Data are represented as united hierarchy of objects with arbitrary structures. Each object has stable and unique string identifier in Entry Service. Entry Service provides common access to objects managed by different data storages (XML files, RBMS and etc.) in the scope of local or global networks.

Entry Service has treelike structure describing data and metadata, including entities, attributes, data types and relationship between them from the point of view of a certain application domain. Entry Service is closely related to Ontology concept model as conceptualization specification for a knowledge domain.

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Changes Made Since Last Version:

• Entry Services over relational DBMS implemented. Oracle and MySQL supported, easy extensible for other RDBMS

• Tree of Entry Services based on sources of different types supported

• An entry editor, GUI for editing data presented in the global Entry Service, added

• ES-Path query language over entry service, analogue for X-Path over XML, implemented

• Distributed Refreshable Objects 3.1 used as a distributed object intercommunication layer

• Account-based security supported

• Object typifying and type inheritance supported

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Entry Service 3 tutorial: entryservice_3_tutorial_eng.pdf 341 kb

Old versions of Entry Service

Entry Service v1.0

Restrictions: version 1.0 has no access to distributed environment

Manual: entryservice_tutorial_eng.pdf 339 kb

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