[Subversion] / PEAK / FEATURES.txt  

View of /PEAK/FEATURES.txt

Parent Directory | Revision Log
Revision: 1713 - (download)
Sun Mar 7 23:51:25 2004 UTC (16 years, 6 months ago) by pje
File size: 7016 byte(s)
Overhaul setup.py to simplify installation and maintenance.  It's no longer
necessary to manually add packages or files to setup.py.  Optional features
can now be controlled with '--with-X' and '--without-X' options.  Bumped
version number to 0.5a4.  (XXX Need to update INSTALL.txt w/options info!)
 Package Features

    As of version 0.5a4, PEAK features include:

    * A component binding framework that makes it easy to parameterize
      components and thus more easily combine and "wire" them together.
      Interfaces, adaptation, and "assembly events" (notification when
      components have been engaged as part of a "complete" application)
      are all available.

    * 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.

    * A "document-driven testing" framework similar to "FIT":http://fit.c2.com/
      that lets you automatically extract test data from design and requirements
      documents created with popular word processors, then create HTML reports
      on what passed or failed.

    * 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.

    * An "event-driven" programming framework that supports ultralight
      "microthreads" implemented via generators, and interacts with Twisted
      or stands alone.












    * 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 versions 1.3
      and 1.4, and MOF 1.3.1, using XMI versions 1.0 and 1.1. (UML 1.5,
      CWM 1.0, CWM 1.1, and XMI 1.2-2.0 are anticipated for version 0.6.)
      Also included is a MOF->Python code generator, which was used to generate
      the UML 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.  Domain
      types can also define string parsing and formatting syntax, so you can
      create domain-specific data languages or just string formats for data
      types (such as specialized date/time or currency types).

      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,
        including the ability to create "executable configuration files"
        or "configuration interpreters" that can load a configuration file
        and run an application instance constructed using the configuration
        data.  Supported formats include an .ini-like PEAK format, and
        arbitrary schemas defined using ZConfig.

      - 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.

      - a robust and flexible logging framework that can integrate with the
        PEP 282 logging module, or stand alone.  It's simpler than the PEP 282
        system for simple log configuration, and is configured on demand
        rather than "up front", and is thus more manageably configurable for
        large or complex applications consisting of components from diverse
        providers.

      - a "process supervisor" framework for multiprocess servers using
        long-running child processes (created via 'fork()') to take maximum
        advantage of multiprocessor machines for CPU-intensive services.

    * 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.



cvs-admin@eby-sarna.com

Powered by ViewCVS 1.0-dev

ViewCVS and CVS Help