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Topic: Enterprise Objects Framework


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In the News (Sat 2 Jun 12)

  
  Enterprise Objects Framework
The object environment was the OpenStep environment developed by the company including a single inheritance model based around Objective-C, and a reference-counting object allocation strategy built into the root classes.
The focal point of the architecture are Enterprise Objects which are intended to be fully portable objects that contain only data and business logic, and are acted upon by the rest of the architecture to be fetched, created, inserted, edited, saved, and deleted.
The frameworks in their current release (EOF 3.1, fall 1999) are very full featured and handle virtually all of the details of traversing and editing relationships, uniquely identifying an object before and after saving, editing, undo, object uniquing and snapshotting, and more.
c2.com /cgi/wiki?EnterpriseObjectsFramework   (597 words)

  
 Enterprise Objects Framework - Definition, explanation
EOF evolved from an "lower level" toolkit known as DB Kit that was available on NeXTSTEP, and became a fairly widely used enterprise programming tool in the mid-1990s.
EOF achieved a modest level of popularity in the financial programming community in the mid-1990's, but it would come into its own with the emergence of the World Wide Web and the concept of Web applications.
EOF is a Java-based framework that connects as a client to a database server.
www.calsky.com /lexikon/en/txt/e/en/enterprise_objects_framework.php   (858 words)

  
 GDL2: the GNUstep Database Library
Apple's implementations of EOF now are based on the Java language, leaving Objective-C developers with no choices but to consider rewriting their applications in Java or looking at a free implementation of EOF.
The role of the former is to transfer data from the RDBMS to enterprise objects and from objects to raw database data.
EOControl is used to maintain an in-memory graph of enterprise objects and delegate modifications to the database using EOAccess.
www.linuxjournal.com /node/7101/print   (2017 words)

  
 EOF 2.2 Release Notes
In your enterprise object class, you must implement a "set" method that copies rather than retains the object passed to it.
(Enterprise Objects Framework raises an exception when a to-one relationship cannot be resolved due to a referential integrity issue in the database).
However, if an object is created and inserted in an editing context and then deleted (thus never being saved to the database), the delete isn't propagated to the destinations of the object's relationships.
docs.info.apple.com /article.html?artnum=72559   (7761 words)

  
 Visible.com - Products : Analyst
The Zachman Framework draws upon the discipline of classical architecture to establish a common vocabulary and set perspectives--a framework--for defining and describing today's complex enterprise systems.
Each of the object classes is centered on a "kernel" entity.
Each object class may have one or more levels of abstraction based upon the business perspective from which the object class is viewed.
www.visible.com /Products/Analyst/uni_model.htm   (817 words)

  
 Enterprise Java Community: Challenging the Dominant Design of the 4-Layer Architecture
The Naked Objects framework (See Part 1) enables a radical approach to the design and development of business systems in which all business functionality is implemented as methods on the domain objects, and these objects are exposed directly and automatically to the user.
One way to assess the complexity of the framework is to count the number of framework classes, and the number of unique methods on those classes, that the application developer has invoked explicitly from within the application code.
Although the Naked Objects framework introduces several new classes and methods, it also eliminates the need for the programmer to deal directly with class libraries for user interface (in particular the Swing library).
www.theserverside.com /articles/article.tss?l=NakedObjectSeries_2   (2752 words)

  
 MacNN | Blogs
In one embodiment, an object graph manager object referred to as in fruiting context is used to identify changes made to data bearing enterprise objects and to notify other interested objects when changes occur.
In another embodiment of the invention, each enterprise object has a primary key that is used to maintain the identification between an enterprise object instance and a corresponding database row.
In this embodiment, the editing context monitors use creating of new enterprise objects to insure that another instance of an enterprise object is not created when a row with the same primary key is fetched from the database.
macnn.com /rd/66551==http://www.macnn.com/blogs/?p=202   (1000 words)

  
 MacNN | MacNN | The Macintosh News Network
In one embodiment, an object graph manager object referred to as in fruiting context is used to identify changes made to data bearing enterprise objects and to notify other interested objects when changes occur.
In another embodiment of the invention, each enterprise object has a primary key that is used to maintain the identification between an enterprise object instance and a corresponding database row.
In this embodiment, the editing context monitors use creating of new enterprise objects to insure that another instance of an enterprise object is not created when a row with the same primary key is fetched from the database.
www.macnn.com /blogs/?p=202   (957 words)

  
 Chapter 8: Enterprise Objects Framework
The objective for this chapter is to understand and use the Enterprise Objects Framework for O/R mapping.
EOF uses model files that describe information about the schema of the database, custom queries, and any information necessary to make a connection to the database.
Your Enterprise Objects, which are the compiled classes from the.java files that EOModeler generated, also need to be added in the same file.
j2ee.masslight.com /Chapter8.html   (1808 words)

  
 Enterprise Java Community: The Case for Naked Objects: Getting Back to the Object Oriented Ideal
GUI toolkits and frameworks have reduced the coding effort associated with the presentation layer; the emerging concept of rendering engines seeks to derive the presentation layer automatically from the controller layer and/or the domain model.
The framework uses Java's reflection capability to determine the methods of any business object and render them visible on the screen by means of a generic viewing mechanism.
The first is improved support for test-driven development: the Naked Objects framework now has a dedicated test harness that makes it very easy to write executable user acceptance tests in the manner advocated by Extreme Programming, though seldom practiced due to the difficulty of writing such tests for systems with conventional graphical user interfaces.
www.theserverside.com /articles/article.tss?l=NakedObjectSeries_1   (1254 words)

  
 Enterprise Architecture John Zachman - About Framework
The Framework as it applies to Enterprises is simply a logical structure for classifying and organizing the descriptive representations of an Enterprise that are significant to the management of the Enterprise as well as to the development of the Enterprise's systems.
The framework is helpful for sorting out very complex, technology and methodology choices and issues that are significant both to general management and to technology management.
Generic software objects and components, along with those from a specific domain repository, can be selected to populate the foundation of the system, but specific application-oriented objects must be designed and integrated to implement the system under development.
www.icmgworld.com /corp/events/zachman/sa_workshop/about_framework.asp   (1616 words)

  
 DBMS - September 1996 - Objects Meet Data
Objects, in contrast, can be highly complex groupings of data or binary information, coupled with application logic or methods that surround the data.
Enterprise objects are simply Objective C (NeXT Computer's OO development environment) objects mapped to a relational database.
The future of relational and object integration is ultimately a matter of moving from the middle to the back end of the architecture.
www.dbmsmag.com /9609d16.html   (2814 words)

  
 NSArchiver
When objects are archived, their class information and the values of their instance variables are written to the archive.
The archiving system notes each reference to a conditional object, but doesn't actually archive the object unless some other object in the graph requests the object to be archived unconditionally.
When the objects are extracted from the archive, the multiple references to objects are resolved, and an equivalent graph of objects is reestablished.
www.channelu.com /NeXT/NeXTStep/3.3/nd/Foundation/Classes/NSArchiver.htmld/index.html   (548 words)

  
 Intelligent Enterprise: Better Insight for Business Decisions
What's core to the problem is the fact that enterprises don't directly control their SaaS infrastructure, and thus, things such as outages and performance issues are largely out of their control.
The current problem is that enterprise IT, quite naturally, prefers to put the cart before the horse.
Intelligent Enterprise discusses what the platform delivers and what critics are saying with two key executives who helped guide development, packaging and pricing.
www.intelligententerprise.com   (1606 words)

  
 Open Source J2EE Frameworks
This framework is based on the MVC architecture (model-view-controller), but in contrast with other MVC frameworks, most of its parts are highly reusable, meaning that your programming effort is minimized whenever possible, avoiding unnecessary programming.
Jdon Framework is the combination of Domain Drive Development(Ruby on Rails that is simple and rapid but not java language) and Ioc/AOP components (Spring that is very agility but has complicated XML configuration).
Jt is a lightweight pattern oriented framework for the rapid implementation of J2EE applications.
java-source.net /open-source/j2ee-frameworks   (1300 words)

  
 P & L Software : Training : WebObjects Development (II)
An in-depth study of Enterprise Objects Framework (EOF) to enable the development of complex WebObjects applications incorporating sophisticated database access.
Create an enterprise object using EOModeler that enables the user to change data in the database.
Review architecture of the Enterprise Objects Framework; understand the classes of the adaptor layer; determine when to use the adaptor layer to improve performance of an application; review the use of the database layer in an application; discuss how to fetch with an editing context programmatically.
www.plsys.co.uk /pwo2.htm   (547 words)

  
 Advanced Systems - February 1995 - Column
The internal architecture of EO Framework that maps the actual objects to data in the RDBMS is somewhat clunkier.
Once an object is fetched, other objects that have relationships to it are modified so that they point to the new object with a standard Objective-C ID, that is, a simple memory reference.
This feature is a vitally important solution to the "impedance mismatch" problem between relations and objects, which results from the fact that a simple "pointer chase" in the object world normally corresponds to a time-consuming join in the underlying relational database.
sunsite.cs.msu.su /sunworldonline/asm-02-1995/asm-02-cs.html   (1343 words)

  
 HybridWorld
The Enterprise Objects Framework documentation occasionally refers to a "root class." This phrase does not lack precision, but reflects a current reality: NEXTSTEP has (temporarily) dual class hierarchies.
Normally, if you archive a complex graph that has cycles where several objects reference a single object, NEXTSTEP keeps enough information about the objects so that the cycles are detected and objects that are pointed to by many other objects are only archived once.
Archiving a mixed-world graph of objects will be much slower, take up more space, and be less reliable (due to the lack of object sharing) when compared to archiving a similar graph of objects that all inherit from the same root class.
www.channelu.com /NeXT/NeXTStep/3.3/nd/Foundation/HybridWorld.htmld/index.html   (1274 words)

  
 Enterprise Performance Management Application Framework
Pages are built using the Builder Palette; objects are dragged and dropped onto the application page from where their custom attributes and behavior can be set.
Objects are linked to data using the 'Connections Mapper', which defines the locations of data sources and associates the object with a business model in the database.
Typically, the base level objects provided by the framework are enough to provide all the facilities required for the development of a custom EPM application.
www.rocketsoftware.com /portfolio/epm/appframework.htm   (522 words)

  
 Pythonology Python Success Stories
ERP5 is written entirely in Python and leverages the Zope Enterprise Objects framework to provide high performance and availability on clusters of inexpensive PCs.
Part of this success was due to Nexedi's ZSQLCatalog component which leverages Zope's object database to implement an innovative approach for querying objects and data mining.
Zope also speeds up object access: Reading the Zope object database is 10 to 100 times faster than retrieving a row from the fastest relational databases available on the market today.
pythonology.org /success&story=nexedi   (1945 words)

  
 NeXT Software Products - EOF 1.1
Applications developed with Enterprise Objects Framework are completely insulated from the underlying data structures used for data storage.
The same business object can be reused even when data is stored differently throughout the organization.
This architecture allows the migration of individual objects or entire applications to new data sources, including relational databases, hierarchical databases and on-line news feeds, without recoding.
www.blackholeinc.com /catalog/software/Software/NeXT/EnterpriseObjectsFramework.shtml   (141 words)

  
 Python Success Stories
Nexedi was given a budget of 80,000 EUR to develop a generic ERP framework published under GPL license and customize it for Coramy's specific needs.
Zope provided clustering, object storage, object publication, transactions, security, workflows, and a web-based management interface, all in a turn-key package.
Python provided a powerful object language and a rich set of libraries which allowed quick development of clean and compact code.
www.python.org /about/success/nexedi   (1986 words)

  
 FreshPorts -- databases/gdl2
Please read my resume and contact me if you have any leads.
The GNUstep Database Library 2 (GDL2) is a set of libraries to map Objective-C objects to rows of relational database management systems (RDBMS).
It aims to be compatible with Enterprise Objects Framework (EOF) as released with WebObjects 4.5 from Apple Inc. This port also provides the GNUstep DBModeler and a Gorm GDL2 Palette.
www.freshports.org /databases/gdl2   (214 words)

  
 Enterprise .NET Community: Naked Objects for .NET
The idea of Naked Objects is that business applications should be built from 'behaviourally complete' domain objects, which are then exposed directly to the user.
At runtime, the framework uses reflection to inspect the attributes, associations and methods of each class and renders these in the form shown to the user.
Robert Matthews is the originator and principal author of the open-source Naked Objects framework, which he started to develop in 1999.
www.theserverside.net /articles/showarticle.tss?id=NakedObjects   (1799 words)

  
 Course 48-756
Object Interactions: Use case-by-use case, we specify how selected objects interact, through their interfaces, to deliver the use case.
Coding: The objects and their interactions are implemented again use case-by-use case to produce a first software prototype of the desired application.
For example, object interactions can be diagrammed use case-by-use case in the form of "interaction diagrams" developed by Jacobson et al., which we found especially useful for novice object-oriented programmers, who are immediately forced to think in terms of object interactions.
www.andrew.cmu.edu /course/48-756/BentleyProp.html   (2021 words)

  
 rentzsch.com: Introduction to WebObjects 5   (Site not responding. Last check: )
EOF is designed to easily store and restore your objects on demand.
EOF can work with your database to create primary keys, invoke your own custom stored procedures and/or Java code or just generate UUIDs by itself.
To that end, as rows are retrieved from the database, EOF checks to make sure the object isn’t already in memory before creating an object based on the row.
rentzsch.com /webobjects/introTo5   (4037 words)

  
 Business Applied C Objects
(BACO) is a set of objects —a framework— which works to give the developer the time he needs to write exactly that part of her Cocoa Enterprise Objects Application which makes it unique.
However, it is build also on top of the Enterprise Objects Framework written in pure Java.
BACO's core object and philosophy is the predecessor of NSPersistentDocument; its main object is BADocument which represents business documents (e.g., invoices, pay orders, stock-cards, etc).
homepage.mac.com /strausz/baco/Business_Applied_C_Objects.html   (159 words)

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