[Subversion] / PEAK / README.txt  

Diff of /PEAK/README.txt

Parent Directory | Revision Log

version 1061, Thu May 1 17:43:55 2003 UTC version 1997, Sun Jan 30 18:51:56 2005 UTC
Line 1 
Line 1 
 PEAK Release 0.5 alpha 1  PEAK Release 0.5 alpha 4
   
  Copyright (C) 1996-2003 by Phillip J. Eby and Tyler C. Sarna.   Copyright (C) 1996-2004 by Phillip J. Eby and Tyler C. Sarna.
  All rights reserved.  This software may be used under the same terms   All rights reserved.  This software may be used under the same terms
  as Zope or Python.  THERE ARE ABSOLUTELY NO WARRANTIES OF ANY KIND.   as Zope or Python.  THERE ARE ABSOLUTELY NO WARRANTIES OF ANY KIND.
  Code quality varies between modules, from "beta" to "experimental   Code quality varies between modules, from "beta" to "experimental
Line 14 
Line 14 
     larger scale, and with fewer defects than ever before. The key is      larger scale, and with fewer defects than ever before. The key is
     component-based development, on a reliable infrastructure.      component-based development, on a reliable infrastructure.
   
     PEAK is an application kit, and applications are made from components.  
     PEAK provides you with a component architecture, component infrastructure,  
     and various general-purpose components and component frameworks for  
     building applications.  As with J2EE, the idea is to let you stop  
     reinventing architectural and infrastructure wheels, so you can put more  
     time into your actual application.  
   
     But PEAK is different from J2EE: it's a single, free implementation of  
     simpler API's based on an easier-to-use language that can nonetheless  
     scale with better performance than J2EE.  
   
     PEAK is the successor to TransWarp, an experimental toolkit for software  
     automation in Python.  PEAK takes the best of the techniques and ideas  
     from TransWarp, and repackages them as an enterprise software toolkit.  
     Where TransWarp emphasized techniques like generative programming and  
     aspect-oriented programming, PEAK emphasizes enterprise applications,  
     and hides the computer science stuff "under the hood", so you can focus  
     on building your application.  
   
     PEAK tools can be used with other "Python Enterprise" frameworks such as      PEAK tools can be used with other "Python Enterprise" frameworks such as
     Zope, Twisted, and the Python DBAPI to construct web-based, GUI, or      Zope, Twisted, and the Python DBAPI to construct web-based, GUI, or
     command-line applications, interacting with any kind of storage, or with      command-line applications, interacting with any kind of storage, or with
Line 41 
Line 22 
   
  Package Features   Package Features
   
     As of version 0.5a1, PEAK features include:     Far too many to list even briefly here: see FEATURES.txt for a very high
      level overview.
   
   
   
   
   
   
   
   
   
   
   
   
     * A component binding framework that makes it easy to parameterize  
       components and thus more easily combine and "wire" them together.  
   
     * A comprehensive configuration framework that allows accessing  
       "utilities" and "configuration properties" in context.  Properties  
       and utilities can be loaded or computed on demand, supplied by rules,  
       defined in configuration files or code, in a supplied or custom  
       format.  Properties and utilities are contextual and can be safely  
       acquired from parent/context components automatically.  
   
     * Naming system/framework that's midway between J2EE's JNDI and CORBA's  
       cosNaming in features, but much easier to use and extend than either  
       of those systems.  
   
     * A storage management and persistence system, including:  
   
         - Atomic, multi-database transactions with two-phase commit.  
   
         - "Data Manager" class framework for persistence management, that  
           allows you to separate business logic from storage implementation.  
           If you can write a few simple methods like "load" and "save" for  
           a given object type and storage approach, you can create your own  
           "DM" components.  You can think of a DM as an advanced form of  
           Python "shelve", that supports references to other objects,  
           transactions, arbitrary back-end storages, and caching.  
   
         - "Stackable" data managers: one DM might serialize a set of objects  
           to XML, which could then be stored in a database record by another  
           DM, and then the database record might be implemented via a DM  
           that writes to disk files!  Each DM only needs to know how to  
           manipulate objects offered by the next-level DM, not the details  
           of the next DM's implementation, so all the DM's are potentially  
           replaceable with alternate storage mechanisms.  
   
         - RDBMS and LDAP connection framework based on the Python DBAPI,  
           that handles data type conversions (via the configuration  
           framework) and seamlessly integrates with the transaction system  
           and naming services framework.  DB Connections can be accessed  
           by name or URL, and bound as default collaborators or utilities  
           for access by other application components.  
   
     * CASE/modelling tools: PEAK includes APIs to read object  
       models created in the XML-based XMI format.  Many open-source and  
       commercial modelling tools support XMI, inlcuding Argo/Poseidon and  
       MagicDraw UML.  PEAK includes pre-built support for UML version 1.3  
       and MOF 1.3.1, using XMI versions 1.0 and 1.1. (UML 1.4, UML 1.5,  
       CWM 1.0, CWM 1.1, and XMI 1.2 are anticipated for 0.5a2, and possibly  
       XMI 2.0 by 0.5 final.)  Also included is a MOF->Python code generator,  
       which was used to generate the UML and CWM support, and which you can  
       use to generate support for other modelling languages based on the MOF.  
   
       For the specifications of XMI, MOF, CWM, and UML, visit:  
       http://www.omg.org/technology/documents/modeling_spec_catalog.htm  
   
     * A domain modelling framework for creating "business object models"  
       with unidirectional and bidirectional associations, generated  
       getters/setters and validators for fields, etc., and all necessary  
       persistence support for use with the PEAK storage framework.  
   
       The business object framework supplies structural metadata about  
       classes built with it, so you can query a class for its fields and  
       links, and their names, types, etc.  This can be useful for  
       implementing model-driven storage or user interfaces.  And the  
       metadata is aligned with the MOF, so generating MOF, UML, or CWM  
       from PEAK models (and vice versa) is possible (although  
       not yet implemented for anything but MOF->PEAK).  
   
     * Application Runtime tools, including:  
   
       - a "command objects" framework for creating command-line applications  
   
       - a "periodic tasks" framework for executing tasks that perform "as  
         needed", scheduling themselves in response to their available workloads  
   
       - a CGI/FastCGI publishing framework that uses 'zope.publisher' to  
         publish a PEAK component tree and its associated transaction service  
   
       - an event-driven "reactor" framework that seamlessly integrates with  
         Twisted, but can also be used without Twisted for applications that are  
         mostly scheduling-oriented, or which use only third-party protocol  
         implementations such as FAM, FastCGI, ReadyExec, etc.  
   
     * AOP and SOP: PEAK allows you to separate concerns as modules, then  
       combine the modules via a "module inheritance" technique.  This  
       lets you define a generated business object model as a  
       "structural" concern, and then combine it with a "behavioral"  
       concern.  This is as simple as writing classes that contain only  
       what you want to add, and then telling PEAK that your new module  
       "inherits" from the generated module.  This is similar to (but  
       designed independently from) the "MixJuice" tool for AOP in Java.  
   
   
  Known Issues and Risks of this Version   Known Issues and Risks of this Version
Line 142 
Line 46 
    in areas not covered by the test suites.  Also, many system interfaces     in areas not covered by the test suites.  Also, many system interfaces
    are still subject to change.     are still subject to change.
   
    PEAK includes early copies of Zope X3's 'zope.interface' and 'persistence'     PEAK includes early copies of Zope X3's 'ZConfig' and 'persistence'
    packages, which have had - and will continue to have - significant     packages, which have had - and may continue to have - significant
    implementation changes.  We will be tracking Zope X3 periodically, but     implementation changes.  We will be tracking Zope X3 periodically, but
    can't guarantee compatibility with arbitrary (e.g. CVS) versions of     can't guarantee compatibility with arbitrary (e.g. CVS) versions of
    Zope X3.     Zope X3.
Line 162 
Line 66 
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
  Third-Party Software Included with PEAK   Third-Party Software Included with PEAK
   
      All third-party software included with PEAK are understood by PEAK's       All third-party software included with PEAK are understood by PEAK's
Line 174 
Line 92 
      please see the 'src/kjbuckets/COPYRIGHT.txt' file for details of its       please see the 'src/kjbuckets/COPYRIGHT.txt' file for details of its
      license.       license.
   
      The 'zope.interface', 'persistence', and 'ZConfig' packages are       The included 'pyexpat', 'doctest', 'optparse', and 'textwrap' modules in
      Copyright Zope Corporation and contributors; please see the 'LICENSE.txt'       'peak.util' are from Python 2.4, and are included for backward
      files in their directories for details of their licenses.       compatibility in Python 2.2 and 2.3.  See the Python license for license
        details.
   
        The 'expat' XML parser is Copyright (c) 1998, 1999, 2000 Thai Open Source
        Software Center Ltd and Clark Cooper, and Copyright (c) 2001, 2002, 2003
        Expat maintainers.  See the 'COPYING' file in 'src/expat' for details of
        its license.
   
        The 'persistence' and 'ZConfig' packages are Copyright Zope
        Corporation and contributors; please see the 'LICENSE.txt' files in their
        directories for details of their licenses.
   
      The 'fcgiapp' module is Copyright Digital Creations, LC (now Zope Corp.);       The 'fcgiapp' module is Copyright Digital Creations, LC (now Zope Corp.);
      see the 'fcgiappmodule.c' for details of its license.  In the same       see the 'fcgiappmodule.c' for details of its license.  In the same
Line 193 
Line 121 
   
   
   
   
   
   
   
   
   
   
   
   
   


Generate output suitable for use with a patch program
Legend:
Removed from v.1061  
changed lines
  Added in v.1997

cvs-admin@eby-sarna.com

Powered by ViewCVS 1.0-dev

ViewCVS and CVS Help