def __init__(self, cassandra_cluster, settings):
super(CassandraUpdateFetcher, self).__init__()
self._log_entry_store = CassandraLogEntryStore(
cassandra_cluster, settings.cassandra_log_keyspace,
settings.cassandra_log_table)
self._document_store = CassandraDocumentStore(
cassandra_cluster, settings.cassandra_id_column_name,
settings.cassandra_timestamp_column_name)
def __init__(self, cassandra_cluster, settings):
super(CassandraUpdateFetcher, self).__init__()
self._log_entry_store = CassandraLogEntryStore(
cassandra_cluster, settings.cassandra_log_keyspace, settings.cassandra_log_table)
self._document_store = CassandraDocumentStore(
cassandra_cluster, settings.cassandra_id_column_name, settings.cassandra_timestamp_column_name)
class CassandraUpdateFetcher(AbstractUpdateFetcher):
def __init__(self, cassandra_cluster, settings):
super(CassandraUpdateFetcher, self).__init__()
self._log_entry_store = CassandraLogEntryStore(
cassandra_cluster, settings.cassandra_log_keyspace,
settings.cassandra_log_table)
self._document_store = CassandraDocumentStore(
cassandra_cluster, settings.cassandra_id_column_name,
settings.cassandra_timestamp_column_name)
def _fetch_data(self, minimum_timestamp):
if minimum_timestamp is None:
return self._log_entry_store.search_all()
else:
return self._log_entry_store.search_by_minimum_timestamp(
minimum_timestamp)
def _to_update(self, data):
log_entry = data
existing_document = self._document_store.read(
log_entry.logged_identifier)
if log_entry.is_delete:
if not existing_document:
return self._build_delete_update(log_entry)
else:
return None
else:
if existing_document:
return self._build_save_update(existing_document)
else:
return None
@staticmethod
def _build_delete_update(log_entry):
update = Update()
update.is_delete = True
update.identifier = log_entry.logged_identifier
update.timestamp = log_entry.timestamp
return update
@staticmethod
def _build_save_update(existing_document):
if existing_document:
return Update.from_document(existing_document, is_delete=False)
else:
return None
class CassandraUpdateFetcher(AbstractUpdateFetcher):
def __init__(self, cassandra_cluster, settings):
super(CassandraUpdateFetcher, self).__init__()
self._log_entry_store = CassandraLogEntryStore(
cassandra_cluster, settings.cassandra_log_keyspace, settings.cassandra_log_table)
self._document_store = CassandraDocumentStore(
cassandra_cluster, settings.cassandra_id_column_name, settings.cassandra_timestamp_column_name)
def _fetch_data(self, minimum_timestamp):
if minimum_timestamp is None:
return self._log_entry_store.search_all()
else:
return self._log_entry_store.search_by_minimum_timestamp(minimum_timestamp)
def _to_update(self, data):
log_entry = data
existing_document = self._document_store.read(log_entry.logged_identifier)
if log_entry.is_delete:
if not existing_document:
return self._build_delete_update(log_entry)
else:
return None
else:
if existing_document:
return self._build_save_update(existing_document)
else:
return None
@staticmethod
def _build_delete_update(log_entry):
update = Update()
update.is_delete = True
update.identifier = log_entry.logged_identifier
update.timestamp = log_entry.timestamp
return update
@staticmethod
def _build_save_update(existing_document):
if existing_document:
return Update.from_document(existing_document, is_delete=False)
else:
return None
def cassandra_document_store(cassandra_cluster):
return CassandraDocumentStore(cassandra_cluster)
def __init__(self, cassandra_cluster, settings):
document_store = CassandraDocumentStore(
cassandra_cluster, settings.cassandra_id_column_name,
settings.cassandra_timestamp_column_name)
super(CassandraUpdateApplier, self).__init__(document_store)
self._cassandra_client = CassandraClient(cassandra_cluster)
