A AT field storage which stores values to a cassandra database
An Archetype field storage which uses a cassandra backing store.
For a customer project I’m doing right now I’m using cassandra as a storage backend for Plone FormGen data. Now the need did arise to also have specific fields of AT content types to be stored in cassandra as well.
- configuration of the cassandra clients done by using plone.app.registry
- per-field configurable keyspace and column family for fields
- The UID of the instance object is used as a key in the specified column family (remember that an insert in cassandra is essentially an update)
- using pycassa as glue library
Import the storage and attach it to a field in your AT Schema:
from collective.atcassandrastorage.storage import CassandraFieldStorage MySchema = atapi.Schema( ... StringField("afield", storage=CassandraFieldStorage("AKeyspace", "AColumnFamily"), ), ... )
This will store and fetch data for afield from a cassandra database using the keyspace AKeyspace and the column family AColumnFamily.
Configuration is done using plone.app.registry. Visit the registry in Plone’s control panel and configure the values, they should be pretty much obvious.
- for configuration
- python Cassandra glue library
- Added tests. [seletz]
- Introduce IInstanceKey interface to allow to overwrite instance key calculation. [seletz]
- Initial release [seletz]