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;
}
}
@Override
public Locker apply(String lockerName) {
String expectedManagerName =
"com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager";
String actualManagerName = storeManager.getClass().getCanonicalName();
// Require AstyanaxStoreManager
Preconditions.checkArgument(
expectedManagerName.equals(actualManagerName),
"Astyanax Recipe locker is only supported with the Astyanax storage backend (configured:"
+ actualManagerName
+ " != required:"
+ expectedManagerName
+ ")");
try {
Class<?> c = storeManager.getClass();
Method method = c.getMethod("openLocker", String.class);
Object o = method.invoke(storeManager, lockerName);
return (Locker) o;
} catch (NoSuchMethodException e) {
throw new IllegalArgumentException(
"Could not find method when configuring locking with Astyanax Recipes");
} catch (IllegalAccessException e) {
throw new IllegalArgumentException(
"Could not access method when configuring locking with Astyanax Recipes", e);
} catch (InvocationTargetException e) {
throw new IllegalArgumentException(
"Could not invoke method when configuring locking with Astyanax Recipes", e);
}
}
private KeyColumnValueStore getBufferStore(String name) throws StorageException {
Preconditions.checkArgument(
bufferSize <= 1 || storeManager.getFeatures().supportsBatchMutation());
KeyColumnValueStore store = null;
store = storeManager.openDatabase(name);
if (bufferSize > 1) {
store = new BufferedKeyColumnValueStore(store, true);
}
// Enable cache
store = new CachedKeyColumnValueStore(store);
return store;
}
public TTLKVCSManager(KeyColumnValueStoreManager manager, int defaultTTL) {
super(manager);
Preconditions.checkArgument(
supportsStoreTTL(manager),
"Wrapped store must support cell or store level TTL: %s",
manager);
Preconditions.checkArgument(defaultTTL > 0, "Default TTL must b > 0: %s", defaultTTL);
Preconditions.checkArgument(
!manager.getFeatures().hasStoreTTL() || (manager instanceof CustomizeStoreKCVSManager));
this.defaultTTL = defaultTTL;
this.features = new StandardStoreFeatures.Builder(manager.getFeatures()).storeTTL(true).build();
this.ttlEnabledStores = Maps.newHashMap();
}
private Log openLog(String logManagerName, String logName) {
try {
ModifiableConfiguration configuration =
new ModifiableConfiguration(
GraphDatabaseConfiguration.ROOT_NS,
config.copy(),
BasicConfiguration.Restriction.NONE);
configuration.set(GraphDatabaseConfiguration.UNIQUE_INSTANCE_ID, "reader");
configuration.set(
GraphDatabaseConfiguration.LOG_READ_INTERVAL, Duration.ofMillis(500L), logManagerName);
if (logStoreManager == null) {
logStoreManager = Backend.getStorageManager(configuration);
}
StoreFeatures f = logStoreManager.getFeatures();
boolean part = f.isDistributed() && f.isKeyOrdered();
if (part) {
for (String logname : new String[] {USER_LOG, TRANSACTION_LOG, MANAGEMENT_LOG})
configuration.set(KCVSLogManager.LOG_MAX_PARTITIONS, 8, logname);
}
assert logStoreManager != null;
if (!logManagers.containsKey(logManagerName)) {
// Open log manager - only supports KCVSLog
Configuration logConfig = configuration.restrictTo(logManagerName);
Preconditions.checkArgument(
logConfig.get(LOG_BACKEND).equals(LOG_BACKEND.getDefaultValue()));
logManagers.put(logManagerName, new KCVSLogManager(logStoreManager, logConfig));
}
assert logManagers.containsKey(logManagerName);
return logManagers.get(logManagerName).openLog(logName);
} catch (BackendException e) {
throw new TitanException("Could not open log: " + logName, e);
}
}
/**
* Clears the storage of all registered backend data providers. This includes backend storage
* engines and index providers.
*
* <p>IMPORTANT: Clearing storage means that ALL data will be lost and cannot be recovered.
*
* @throws StorageException
*/
public void clearStorage() throws StorageException {
edgeStore.close();
vertexIndexStore.close();
edgeIndexStore.close();
idAuthority.close();
storeManager.clearStorage();
// Indexes
for (IndexProvider index : indexes.values()) index.clearStorage();
}
private void closeLogs() {
try {
for (LogManager lm : logManagers.values()) lm.close();
logManagers.clear();
if (logStoreManager != null) {
logStoreManager.close();
logStoreManager = null;
}
} catch (BackendException e) {
throw new TitanException(e);
}
}
/**
* Opens a new transaction against all registered backend system wrapped in one {@link
* BackendTransaction}.
*
* @return
* @throws StorageException
*/
public BackendTransaction beginTransaction(TransactionConfiguration configuration)
throws StorageException {
StoreTxConfig txConfig = new StoreTxConfig(configuration.getMetricsPrefix());
if (configuration.hasTimestamp()) txConfig.setTimestamp(configuration.getTimestamp());
StoreTransaction tx = storeManager.beginTransaction(txConfig);
if (bufferSize > 1) {
Preconditions.checkArgument(storeManager.getFeatures().supportsBatchMutation());
tx =
new BufferTransaction(
tx, storeManager, bufferSize, writeAttempts, persistAttemptWaittime);
}
if (!storeFeatures.supportsLocking()) {
if (storeFeatures.supportsTransactions()) {
// No transaction wrapping needed
} else if (storeFeatures.supportsConsistentKeyOperations()) {
txConfig =
new StoreTxConfig(ConsistencyLevel.KEY_CONSISTENT, configuration.getMetricsPrefix());
if (configuration.hasTimestamp()) txConfig.setTimestamp(configuration.getTimestamp());
tx =
new ExpectedValueCheckingTransaction(
tx, storeManager.beginTransaction(txConfig), readAttempts);
}
}
// Index transactions
Map<String, IndexTransaction> indexTx = new HashMap<String, IndexTransaction>(indexes.size());
for (Map.Entry<String, IndexProvider> entry : indexes.entrySet()) {
indexTx.put(entry.getKey(), new IndexTransaction(entry.getValue()));
}
return new BackendTransaction(
tx,
storeManager.getFeatures(),
edgeStore,
vertexIndexStore,
edgeIndexStore,
readAttempts,
persistAttemptWaittime,
indexTx);
}
public void close() throws StorageException {
if (tx != null) tx.commit();
store.close();
manager.close();
}
public StoreTransaction startTx() throws StorageException {
return manager.beginTransaction(new StoreTxConfig());
}
public void open() throws StorageException {
manager = openStorageManager();
store = manager.openDatabase(storeName);
tx = startTx();
}
@Override
public void shutdown() throws Exception {
super.shutdown();
storeManager.close();
}
public static boolean supportsStoreTTL(KeyColumnValueStoreManager manager) {
return supportsStoreTTL(manager.getFeatures());
}
/**
* Returns the {@link StoreFeatures} of the configured backend storage engine.
*
* @return
*/
public StoreFeatures getStoreFeatures() {
return storeManager.getFeatures();
}
private KeyColumnValueStore getStore(String name) throws StorageException {
KeyColumnValueStore store = storeManager.openDatabase(name);
return store;
}
