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        "author": "Joaquin Casares",
        "author_email": "joaquin.casares AT gmail.com",
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        "description": "# CassandraJsonMapper\n\n\nCassandraJsonMapper is an Apache Cassandra Python driver developed for direct\nfunctionality to store JSON-style objects mapped into Cassandra composite columns.\n\nThis is done via the main methods: `save(key)`, `get(key)`, `delete(key)`.\n\n## History\n\nI needed something small, light-weight, and fast enough on reads and writes for\nshort bursts of data. I was handling JSON returns from REST API calls that \nI would later do light-weight analytics over. This fit my use case efficiently, \nso I decided to share it.\n\n## Setup\n\n    pip install CassandraJsonMapper\n\n\n## Initialize Database\n\nSince CassandraJsonMapper uses composite columns heavily to do it's nesting,\nthe schema for the column family that CassandraJsonMapper will use must look\nsimilar to what is provided. \n\n**NOTE:**\nKeep in mind that the number of composite columns created must be at \nleast as deep as the deepest JSON document that will be saved.\n\n```sql\ncreate keyspace json\n  with placement_strategy = 'SimpleStrategy'\n  and strategy_options = {replication_factor : 1};\n\nuse json;\n\ncreate column family json\n  with column_type = 'Standard'\n  and comparator = 'CompositeType(\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType,\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType,\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType,\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType,\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType,\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType,\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType,\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType,\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType,\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType,\n    org.apache.cassandra.db.marshal.BytesType,org.apache.cassandra.db.marshal.BytesType)'\n  and default_validation_class = 'BytesType'\n  and key_validation_class = 'BytesType';\n```\n\n\n## Example Code\n\n```python\nimport CassandraJsonMapper\n\ndb = CassandraJsonMapper.db(keyspace='json', column_family='json')\n\ndocument = {\n    'key2': {\n        'test': 'okay'\n    }\n}\ndb.save(document)\nassert db.get('key2') == document['key2']\n\ndb.delete('key2')\nassert db.get('key2') == {}\n```\n\n\n## Multi-threaded Example\n\n```python\ndb.mt_save(document)\ndb.mt_finish()\n\nassert db.get('key2') == document['key2']\n```\n\n\n## Limitations\n\nIn hopes of keeping this client simple, the following is not supported:\n\n* Cannot append to lists.\n* Cannot delete portions of a document.\n* Reads may not be returned in full, but paging is supported.\n\n\n## Future Implementations\n\n* Deleting portions of documents.\n* Better list support.\n\n\n## Methods\n\nThis client has a few main methods:\n\n```python\ndef __init__(self, keyspace, column_family, server_list=['localhost'],\n             write_consistency=ConsistencyLevel.ONE,\n             read_consistency=ConsistencyLevel.ONE,\n             request_size=100, batch_size=6000, thread_count=20)\n    \"\"\"Create the Cassandra connection pool and CF connection.\"\"\"\n\ndef save(self, dictionary_payload, write_consistency=None, batch_size=None)\n    \"\"\"Convert and save dictionary into Cassandra.\"\"\"\n\ndef get(self, key, read_consistency=None,\n        return_last_row=False, column_start=None, request_size=None)\n    \"\"\"Read and convert Cassandra response into dictionary.\"\"\"\n\ndef delete(self, key, write_consistency=None)\n    \"\"\"Delete dictionary from Cassandra.\"\"\"\n\ndef mt_save(self, dictionary_payload)\n    \"\"\"Save dictionary asynchronously.\"\"\"\n\ndef mt_finish(self)\n    \"\"\"Wait until all pending inserts are performed.\"\"\"\n```",
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