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        "author": "Stefan Eletzhofer",
        "author_email": "stefan.eletzhofer@inquant.de",
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        "description": "=============================\ncollective.atcassandrastorage\n=============================\n\n:Author: Stefan Eletzhofer\n:Date: 2010-05-28\n\n\nAbstract\n========\n\nAn Archetype field storage which uses a *cassandra* backing store.\n\nReasoning\n=========\n\nFor a customer project I'm doing right now I'm using *cassandra* as a storage\nbackend for *Plone FormGen* data.  Now the need did arise to also have specific\nfields of AT content types to be stored in cassandra as well.\n\n\nDesign decisions\n================\n\n- configuration of the cassandra clients done by using *plone.app.registry*\n\n- per-field configurable *keyspace* and *column family* for fields\n\n- The **UID** of the instance object is used as a *key* in the specified\n  *column family* (remember that an *insert* in cassandra is essentially an\n  *update*)\n\n- using *pycassa* as glue library\n\nUsage\n=====\n\nImport the storage and attach it to a field in your AT Schema::\n\n\n    from collective.atcassandrastorage.storage import CassandraFieldStorage\n\n    MySchema = atapi.Schema(\n          ...\n          StringField(\"afield\",\n                  storage=CassandraFieldStorage(\"AKeyspace\", \"AColumnFamily\"),\n                  ),\n          ...\n    )\n\nThis will store and fetch data for *afield* from a cassandra database using\nthe keyspace *AKeyspace* and the column family *AColumnFamily*.\n\nConfiguration\n=============\n\nConfiguration is done using *plone.app.registry*.  Visit the registry in\nPlone's control panel and configure the values, they should be pretty much\nobvious.\n\nDependencies\n============\n\n*plone.app.registry*\n    for configuration\n\n*pycassa*\n    python Cassandra glue library\n\nLinks\n=====\n\n**cassandra**\n    http://cassandra.apache.org/\n\n**archetypes**\n    http://plone.org/products/archetypes\n\n**pycassa**\n    http://github.com/vomjom/pycassa\n\n..  vim: set ft=rst tw=75 nocin nosi ai sw=4 ts=4 expandtab:\n\nChangelog\n=========\n\n0.2 (2010-05-31)\n-------------------\n\n- Added tests.\n  [seletz]\n\n- Introduce IInstanceKey interface to allow to overwrite instance key\n  calculation.\n  [seletz]\n\n0.1 (2010-05-29)\n-------------------\n\n- Initial release\n  [seletz]",
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