protected override void PreStart()
{
base.PreStart();
// Create session
CassandraJournalSettings settings = _cassandraExtension.JournalSettings;
_session = _cassandraExtension.SessionManager.ResolveSession(settings.SessionKey);
// Create keyspace if necessary and always try to create table
if (settings.KeyspaceAutocreate)
{
_session.Execute(string.Format(JournalStatements.CreateKeyspace, settings.Keyspace, settings.KeyspaceCreationOptions));
}
var fullyQualifiedTableName = string.Format("{0}.{1}", settings.Keyspace, settings.Table);
string createTable = string.IsNullOrWhiteSpace(settings.TableCreationProperties)
? string.Format(JournalStatements.CreateTable, fullyQualifiedTableName, string.Empty, string.Empty)
: string.Format(JournalStatements.CreateTable, fullyQualifiedTableName, " WITH ",
settings.TableCreationProperties);
_session.Execute(createTable);
// Prepare some statements against C*
_writeMessage = _session.PrepareFormat(JournalStatements.WriteMessage, fullyQualifiedTableName);
_writeHeader = _session.PrepareFormat(JournalStatements.WriteHeader, fullyQualifiedTableName);
_selectHeaderSequence = _session.PrepareFormat(JournalStatements.SelectHeaderSequence, fullyQualifiedTableName);
_selectLastMessageSequence = _session.PrepareFormat(JournalStatements.SelectLastMessageSequence, fullyQualifiedTableName);
_selectMessages = _session.PrepareFormat(JournalStatements.SelectMessages, fullyQualifiedTableName);
_writeDeleteMarker = _session.PrepareFormat(JournalStatements.WriteDeleteMarker, fullyQualifiedTableName);
_deleteMessagePermanent = _session.PrepareFormat(JournalStatements.DeleteMessagePermanent, fullyQualifiedTableName);
_selectDeletedToSequence = _session.PrepareFormat(JournalStatements.SelectDeletedToSequence, fullyQualifiedTableName);
_selectConfigurationValue = _session.PrepareFormat(JournalStatements.SelectConfigurationValue, fullyQualifiedTableName);
_writeConfigurationValue = _session.PrepareFormat(JournalStatements.WriteConfigurationValue, fullyQualifiedTableName);
// The partition size can only be set once (the first time the table is created) so see if it's already been set
long partitionSize = GetConfigurationValueOrDefault("partition-size", -1L);
if (partitionSize == -1L)
{
// Persist the partition size specified in the cluster settings
WriteConfigurationValue("partition-size", settings.PartitionSize);
}
else if (partitionSize != settings.PartitionSize)
{
throw new ConfigurationException(string.Format(InvalidPartitionSizeException, partitionSize, settings.PartitionSize));
}
}
public CassandraExtension(ExtendedActorSystem system)
{
if (system == null) throw new ArgumentNullException("system");
// Initialize fallback configuration defaults
system.Settings.InjectTopLevelFallback(CassandraPersistence.DefaultConfig());
// Get or add the session manager
SessionManager = CassandraSession.Instance.Apply(system);
// Read config
var journalConfig = system.Settings.Config.GetConfig("cassandra-journal");
JournalSettings = new CassandraJournalSettings(journalConfig);
var snapshotConfig = system.Settings.Config.GetConfig("cassandra-snapshot-store");
SnapshotStoreSettings = new CassandraSnapshotStoreSettings(snapshotConfig);
}