public Backend(Configuration storageConfig) {
this.storageConfig = storageConfig;
storeManager = getStorageManager(storageConfig);
indexes = getIndexes(storageConfig);
storeFeatures = storeManager.getFeatures();
basicMetrics = storageConfig.getBoolean(BASIC_METRICS, BASIC_METRICS_DEFAULT);
mergeBasicMetrics =
storageConfig.getBoolean(MERGE_BASIC_METRICS_KEY, MERGE_BASIC_METRICS_DEFAULT);
int bufferSizeTmp = storageConfig.getInt(BUFFER_SIZE_KEY, BUFFER_SIZE_DEFAULT);
Preconditions.checkArgument(
bufferSizeTmp >= 0, "Buffer size must be non-negative (use 0 to disable)");
if (!storeFeatures.supportsBatchMutation()) {
bufferSize = 0;
log.debug("Buffering disabled because backend does not support batch mutations");
} else bufferSize = bufferSizeTmp;
writeAttempts = storageConfig.getInt(WRITE_ATTEMPTS_KEY, WRITE_ATTEMPTS_DEFAULT);
Preconditions.checkArgument(writeAttempts > 0, "Write attempts must be positive");
readAttempts = storageConfig.getInt(READ_ATTEMPTS_KEY, READ_ATTEMPTS_DEFAULT);
Preconditions.checkArgument(readAttempts > 0, "Read attempts must be positive");
persistAttemptWaittime =
storageConfig.getInt(STORAGE_ATTEMPT_WAITTIME_KEY, STORAGE_ATTEMPT_WAITTIME_DEFAULT);
Preconditions.checkArgument(
persistAttemptWaittime > 0, "Persistence attempt retry wait time must be non-negative");
// If lock prefix is unspecified, specify it now
storageConfig.setProperty(
ExpectedValueCheckingStore.LOCAL_LOCK_MEDIATOR_PREFIX_KEY,
storageConfig.getString(
ExpectedValueCheckingStore.LOCAL_LOCK_MEDIATOR_PREFIX_KEY, storeManager.getName()));
final String lockBackendName =
storageConfig.getString(
GraphDatabaseConfiguration.LOCK_BACKEND,
GraphDatabaseConfiguration.LOCK_BACKEND_DEFAULT);
if (REGISTERED_LOCKERS.containsKey(lockBackendName)) {
lockerCreator = REGISTERED_LOCKERS.get(lockBackendName);
} else {
throw new TitanConfigurationException(
"Unknown lock backend \""
+ lockBackendName
+ "\". Known lock backends: "
+ Joiner.on(", ").join(REGISTERED_LOCKERS.keySet())
+ ".");
}
// Never used for backends that have innate transaction support, but we
// want to maintain the non-null invariant regardless; it will default
// to connsistentkey impl if none is specified
Preconditions.checkNotNull(lockerCreator);
if (storeFeatures.isDistributed() && storeFeatures.isKeyOrdered()) {
log.debug("Wrapping index store with HashPrefix");
hashPrefixIndex = true;
} else {
hashPrefixIndex = false;
}
}
