org.janusgraph.diskstorage.keycolumnvalue.ttl

Class TTLKCVSManager

java.lang.Object

org.janusgraph.diskstorage.keycolumnvalue.KCVSManagerProxy

org.janusgraph.diskstorage.keycolumnvalue.ttl.TTLKCVSManager

All Implemented Interfaces:

KeyColumnValueStoreManager, StoreManager

public class TTLKCVSManager
extends KCVSManagerProxy

Turns a store with fine-grained cell-level TTL support into a store with coarse-grained store-level (column-family-level) TTL support. Useful when running a KCVSLog atop Cassandra. Cassandra has cell-level TTL support, but KCVSLog just wants to write all of its data with a fixed, CF-wide TTL. This class stores a fixed TTL set during construction and applies it to every entry written through subsequent mutate/mutateMany calls.

Author:

Matthias Broecheler ([email protected])

Field Summary

Fields inherited from class org.janusgraph.diskstorage.keycolumnvalue.KCVSManagerProxy

manager

Constructor Summary

Constructors

Constructor and Description
TTLKCVSManager(KeyColumnValueStoreManager manager)

Method Summary

Modifier and Type	Method and Description
static void	applyTTL(Collection<Entry> additions, int ttl)
StoreFeatures	getFeatures() Returns the features supported by this storage manager
void	mutateMany(Map<String,Map<StaticBuffer,KCVMutation>> mutations, StoreTransaction txh) Executes multiple mutations at once.
KeyColumnValueStore	openDatabase(String name) Opens an ordered database by the given name.
KeyColumnValueStore	openDatabase(String name, StoreMetaData.Container metaData) Opens an ordered database by the given name.
static boolean	supportsAnyTTL(StoreFeatures features) Returns true if the parameter supports at least one of the following: cell-level TTL StoreFeatures.hasCellTTL() store-level TTL StoreFeatures.hasStoreTTL()

Methods inherited from class org.janusgraph.diskstorage.keycolumnvalue.KCVSManagerProxy

beginTransaction, clearStorage, close, exists, getLocalKeyPartition, getName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.janusgraph.diskstorage.keycolumnvalue.StoreManager

getHadoopManager

Constructor Detail

TTLKCVSManager

public TTLKCVSManager(KeyColumnValueStoreManager manager)

Method Detail

supportsAnyTTL

public static boolean supportsAnyTTL(StoreFeatures features)

Returns true if the parameter supports at least one of the following:

• cell-level TTL StoreFeatures.hasCellTTL()
• store-level TTL StoreFeatures.hasStoreTTL()

Parameters:

features - an arbitrary StoreFeatures instance

Returns:

true if and only if at least one TTL mode is supported

getFeatures

public StoreFeatures getFeatures()

Description copied from interface: StoreManager

Returns the features supported by this storage manager

Specified by:

getFeatures in interface StoreManager

Overrides:

getFeatures in class KCVSManagerProxy

Returns:

The supported features of this storage manager

See Also:

StoreFeatures

openDatabase

public KeyColumnValueStore openDatabase(String name)
                                 throws BackendException

Description copied from interface: KeyColumnValueStoreManager

Opens an ordered database by the given name. If the database does not exist, it is created. If it has already been opened, the existing handle is returned.

Parameters:

name - Name of database

Returns:

Database Handle

Throws:

BackendException

openDatabase

public KeyColumnValueStore openDatabase(String name,
                                        StoreMetaData.Container metaData)
                                 throws BackendException

Description copied from interface: KeyColumnValueStoreManager

Opens an ordered database by the given name. If the database does not exist, it is created. If it has already been opened, the existing handle is returned.

Specified by:

openDatabase in interface KeyColumnValueStoreManager

Overrides:

openDatabase in class KCVSManagerProxy

Parameters:

name - Name of database

metaData - options specific to this store

Returns:

Database Handle

Throws:

BackendException

mutateMany

public void mutateMany(Map<String,Map<StaticBuffer,KCVMutation>> mutations,
                       StoreTransaction txh)
                throws BackendException

Description copied from interface: KeyColumnValueStoreManager

Executes multiple mutations at once. For each store (identified by a string name) there is a map of (key,mutation) pairs that specifies all the mutations to execute against the particular store for that key. This is an optional operation. Check StoreManager.getFeatures() if it is supported by a particular implementation.

Specified by:

mutateMany in interface KeyColumnValueStoreManager

Overrides:

mutateMany in class KCVSManagerProxy

Throws:

BackendException

applyTTL

public static void applyTTL(Collection<Entry> additions,
                            int ttl)