PEAK Release 0.5 alpha 3 |
PEAK Release 0.5 alpha 4 |
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Copyright (C) 1996-2004 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 |
no storage at all. Whatever the application type, PEAK can help you put |
no storage at all. Whatever the application type, PEAK can help you put |
it together. |
it together. |
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Package Features |
Package Features |
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Far too many to list even briefly here: see FEATURES.txt for a very high |
As of version 0.5a3, PEAK features include: |
level overview. |
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* A component binding framework that makes it easy to parameterize |
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components and thus more easily combine and "wire" them together. |
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Interfaces, adaptation, and "assembly events" (notification when |
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components have been engaged as part of a "complete" application) |
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are all available. |
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* A comprehensive configuration framework that allows accessing |
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"utilities" and "configuration properties" in context. Properties |
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and utilities can be loaded or computed on demand, supplied by rules, |
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defined in configuration files or code, in a supplied or custom |
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format. Properties and utilities are contextual and can be safely |
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acquired from parent/context components automatically. |
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* A "document-driven testing" framework similar to "FIT":http://fit.c2.com/ |
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that lets you automatically extract test data from design and requirements |
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documents created with popular word processors, then create HTML reports |
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on what passed or failed. |
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* Naming system/framework that's midway between J2EE's JNDI and CORBA's |
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cosNaming in features, but much easier to use and extend than either |
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of those systems. |
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* A storage management and persistence system, including: |
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- Atomic, multi-database transactions with two-phase commit. |
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- "Data Manager" class framework for persistence management, that |
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allows you to separate business logic from storage implementation. |
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If you can write a few simple methods like "load" and "save" for |
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a given object type and storage approach, you can create your own |
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"DM" components. You can think of a DM as an advanced form of |
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Python "shelve", that supports references to other objects, |
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transactions, arbitrary back-end storages, and caching. |
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- "Stackable" data managers: one DM might serialize a set of objects |
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to XML, which could then be stored in a database record by another |
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DM, and then the database record might be implemented via a DM |
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that writes to disk files! Each DM only needs to know how to |
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manipulate objects offered by the next-level DM, not the details |
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of the next DM's implementation, so all the DM's are potentially |
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replaceable with alternate storage mechanisms. |
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- RDBMS and LDAP connection framework based on the Python DBAPI, |
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that handles data type conversions (via the configuration |
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framework) and seamlessly integrates with the transaction system |
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and naming services framework. DB Connections can be accessed |
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by name or URL, and bound as default collaborators or utilities |
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for access by other application components. |
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* CASE/modelling tools: PEAK includes APIs to read object |
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models created in the XML-based XMI format. Many open-source and |
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commercial modelling tools support XMI, inlcuding Argo/Poseidon and |
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MagicDraw UML. PEAK includes pre-built support for UML versions 1.3 |
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and 1.4, and MOF 1.3.1, using XMI versions 1.0 and 1.1. (UML 1.5, |
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CWM 1.0, CWM 1.1, and XMI 1.2-2.0 are anticipated for version 0.6.) |
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Also included is a MOF->Python code generator, which was used to generate |
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the UML support, and which you can use to generate support for other |
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modelling languages based on the MOF. |
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For the specifications of XMI, MOF, CWM, and UML, visit: |
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http://www.omg.org/technology/documents/modeling_spec_catalog.htm |
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* A domain modelling framework for creating "business object models" |
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with unidirectional and bidirectional associations, generated |
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getters/setters and validators for fields, etc., and all necessary |
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persistence support for use with the PEAK storage framework. Domain |
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types can also define string parsing and formatting syntax, so you can |
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create domain-specific data languages or just string formats for data |
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types (such as specialized date/time or currency types). |
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The business object framework supplies structural metadata about |
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classes built with it, so you can query a class for its fields and |
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links, and their names, types, etc. This can be useful for |
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implementing model-driven storage or user interfaces. And the |
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metadata is aligned with the MOF, so generating MOF, UML, or CWM |
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from PEAK models (and vice versa) is possible (although |
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not yet implemented for anything but MOF->PEAK). |
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* Application Runtime tools, including: |
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- a "command objects" framework for creating command-line applications, |
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including the ability to create "executable configuration files" |
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or "configuration interpreters" that can load a configuration file |
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and run an application instance constructed using the configuration |
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data. Supported formats include an .ini-like PEAK format, and |
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arbitrary schemas defined using ZConfig. |
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- a "periodic tasks" framework for executing tasks that perform "as |
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needed", scheduling themselves in response to their available workloads |
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- a CGI/FastCGI publishing framework that uses 'zope.publisher' to |
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publish a PEAK component tree and its associated transaction service |
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- An "event-driven" programming framework that supports ultralight |
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"microthreads" implemented via generators, and interacts with Twisted |
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or stands alone. |
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- an event-driven "reactor" framework that seamlessly integrates with |
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Twisted, but can also be used without Twisted for applications that are |
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mostly scheduling-oriented, or which use only third-party protocol |
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implementations such as FAM, FastCGI, ReadyExec, etc. |
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- a robust and flexible logging framework that can integrate with the |
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PEP 282 logging module, or stand alone. It's simpler than the PEP 282 |
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system for simple log configuration, and is configured on demand |
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rather than "up front", and is thus more manageably configurable for |
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large or complex applications consisting of components from diverse |
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providers. |
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- a "process supervisor" framework for multiprocess servers using |
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long-running child processes (created via 'fork()') to take maximum |
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advantage of multiprocessor machines for CPU-intensive services. |
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* AOP and SOP: PEAK allows you to separate concerns as modules, then |
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combine the modules via a "module inheritance" technique. This |
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lets you define a generated business object model as a |
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"structural" concern, and then combine it with a "behavioral" |
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concern. This is as simple as writing classes that contain only |
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what you want to add, and then telling PEAK that your new module |
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"inherits" from the generated module. This is similar to (but |
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designed independently from) the "MixJuice" tool for AOP in Java. |
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Known Issues and Risks of this Version |
Known Issues and Risks of this Version |
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Third-Party Software Included with PEAK |
Third-Party Software Included with PEAK |
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All third-party software included with PEAK are understood by PEAK's |
All third-party software included with PEAK are understood by PEAK's |
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. |
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The 'csv' module is part of Python 2.3 and above, and is included for |
The included 'pyexpat', 'doctest', 'optparse', and 'textwrap' modules in |
backward compatibility in Python 2.2. See the Python license for license |
'peak.util' are from Python 2.4, and are included for backward |
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compatibility in Python 2.2 and 2.3. See the Python license for license |
details. |
details. |
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The 'datetime', 'persistence' and 'ZConfig' packages are Copyright Zope |
The 'expat' XML parser is Copyright (c) 1998, 1999, 2000 Thai Open Source |
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Software Center Ltd and Clark Cooper, and Copyright (c) 2001, 2002, 2003 |
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Expat maintainers. See the 'COPYING' file in 'src/expat' for details of |
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its license. |
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The 'persistence' and 'ZConfig' packages are Copyright Zope |
Corporation and contributors; please see the 'LICENSE.txt' files in their |
Corporation and contributors; please see the 'LICENSE.txt' files in their |
directories for details of their licenses. |
directories for details of their licenses. |
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