com.thinkaurelius.titan.diskstorage.keycolumnvalue

Class StandardStoreFeatures

java.lang.Object

com.thinkaurelius.titan.diskstorage.keycolumnvalue.StandardStoreFeatures

All Implemented Interfaces:

StoreFeatures

public class StandardStoreFeatures
extends Object
implements StoreFeatures

Immutable, StandardStoreFeatures.Builder-customizable implementation of StoreFeatures.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	StandardStoreFeatures.Builder The only way to instantiate StandardStoreFeatures.

Method Summary

Methods

Modifier and Type	Method and Description
Configuration	getKeyConsistentTxConfig() Get a transaction configuration that enforces key consistency.
Configuration	getLocalKeyConsistentTxConfig() Get a transaction configuration that enforces local key consistency.
boolean	hasBatchMutation() Whether this storage backend supports batch mutations via KeyColumnValueStoreManager.mutateMany(java.util.Map, StoreTransaction).
boolean	hasLocalKeyPartition()
boolean	hasLocking() Whether this store supports locking via KeyColumnValueStore.acquireLock(com.thinkaurelius.titan.diskstorage.StaticBuffer, com.thinkaurelius.titan.diskstorage.StaticBuffer, com.thinkaurelius.titan.diskstorage.StaticBuffer, StoreTransaction)
boolean	hasMultiQuery() Whether this storage backend supports query operations on multiple keys via KeyColumnValueStore.getSlice(java.util.List, SliceQuery, StoreTransaction)
boolean	hasOrderedScan() Whether this storage backend supports global key scans via KeyColumnValueStore.getKeys(KeyRangeQuery, StoreTransaction).
boolean	hasScan() Equivalent to calling StoreFeatures.hasUnorderedScan() || StoreFeatures.hasOrderedScan().
boolean	hasTimestamps() Returns true if column-value entries in this storage backend are annotated with a timestamp, else false.
boolean	hasTTL() Returns true if this storage backend support time-to-live (TTL) settings for column-value entries.
boolean	hasTxIsolation() Whether this storage backend's transactions support isolation.
boolean	hasUnorderedScan() Whether this storage backend supports global key scans via KeyColumnValueStore.getKeys(SliceQuery, StoreTransaction).
boolean	hasVisibility() Returns true if this storage backend supports entry-level visibility by attaching a visibility or authentication token to each column-value entry in the data store and limited retrievals to "visible" entries.
boolean	isDistributed() Whether this storage backend writes and reads data from more than one machine.
boolean	isKeyConsistent() Whether this storage backend provides strong consistency within each key/row.
boolean	isKeyOrdered() Whether this storage backend preserves key locality.

Methods inherited from class java.lang.Object

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

Method Detail

hasScan

public boolean hasScan()

Description copied from interface: StoreFeatures

Equivalent to calling StoreFeatures.hasUnorderedScan() || StoreFeatures.hasOrderedScan().

Specified by:

hasScan in interface StoreFeatures

hasUnorderedScan

public boolean hasUnorderedScan()

Description copied from interface: StoreFeatures

Whether this storage backend supports global key scans via KeyColumnValueStore.getKeys(SliceQuery, StoreTransaction).

Specified by:

hasUnorderedScan in interface StoreFeatures

hasOrderedScan

public boolean hasOrderedScan()

Description copied from interface: StoreFeatures

Whether this storage backend supports global key scans via KeyColumnValueStore.getKeys(KeyRangeQuery, StoreTransaction).

Specified by:

hasOrderedScan in interface StoreFeatures

hasMultiQuery

public boolean hasMultiQuery()

Description copied from interface: StoreFeatures

Whether this storage backend supports query operations on multiple keys via KeyColumnValueStore.getSlice(java.util.List, SliceQuery, StoreTransaction)

Specified by:

hasMultiQuery in interface StoreFeatures

hasLocking

public boolean hasLocking()

Description copied from interface: StoreFeatures

Whether this store supports locking via KeyColumnValueStore.acquireLock(com.thinkaurelius.titan.diskstorage.StaticBuffer, com.thinkaurelius.titan.diskstorage.StaticBuffer, com.thinkaurelius.titan.diskstorage.StaticBuffer, StoreTransaction)

Specified by:

hasLocking in interface StoreFeatures

hasBatchMutation

public boolean hasBatchMutation()

Description copied from interface: StoreFeatures

Whether this storage backend supports batch mutations via KeyColumnValueStoreManager.mutateMany(java.util.Map, StoreTransaction).

Specified by:

hasBatchMutation in interface StoreFeatures

isKeyOrdered

public boolean isKeyOrdered()

Description copied from interface: StoreFeatures

Whether this storage backend preserves key locality. This affects Titan's use of vertex ID partitioning.

Specified by:

isKeyOrdered in interface StoreFeatures

isDistributed

public boolean isDistributed()

Description copied from interface: StoreFeatures

Whether this storage backend writes and reads data from more than one machine.

Specified by:

isDistributed in interface StoreFeatures

hasTxIsolation

public boolean hasTxIsolation()

Description copied from interface: StoreFeatures

Whether this storage backend's transactions support isolation.

Specified by:

hasTxIsolation in interface StoreFeatures

isKeyConsistent

public boolean isKeyConsistent()

Description copied from interface: StoreFeatures

Whether this storage backend provides strong consistency within each key/row. This property is weaker than general strong consistency, since reads and writes to different keys need not obey strong consistency. "Key consistency" is shorthand for "strong consistency at the key/row level".

Specified by:

isKeyConsistent in interface StoreFeatures

Returns:

true if the backend supports key-level strong consistency

hasTimestamps

public boolean hasTimestamps()

Description copied from interface: StoreFeatures

Returns true if column-value entries in this storage backend are annotated with a timestamp, else false. It is assumed that the timestamp matches the one set during the committing transaction.

Specified by:

hasTimestamps in interface StoreFeatures

Returns:

hasTTL

public boolean hasTTL()

Description copied from interface: StoreFeatures

Returns true if this storage backend support time-to-live (TTL) settings for column-value entries. If such a value is provided as a meta-data annotation on the Entry, the entry will disappear from the storage backend after the given amount of time.

Specified by:

hasTTL in interface StoreFeatures

Returns:

true if the storage backend supports TTL, else false

hasVisibility

public boolean hasVisibility()

Description copied from interface: StoreFeatures

Returns true if this storage backend supports entry-level visibility by attaching a visibility or authentication token to each column-value entry in the data store and limited retrievals to "visible" entries.

Specified by:

hasVisibility in interface StoreFeatures

Returns:

getKeyConsistentTxConfig

public Configuration getKeyConsistentTxConfig()

Description copied from interface: StoreFeatures

Get a transaction configuration that enforces key consistency. This method has undefined behavior when StoreFeatures.isKeyConsistent() is false.

Specified by:

getKeyConsistentTxConfig in interface StoreFeatures

Returns:

a key-consistent tx config

getLocalKeyConsistentTxConfig

public Configuration getLocalKeyConsistentTxConfig()

Description copied from interface: StoreFeatures

Get a transaction configuration that enforces local key consistency. "Local" has flexible meaning depending on the backend implementation. An example is Cassandra's notion of LOCAL_QUORUM, which provides strong consistency among all replicas in the same datacenter as the node handling the request, but not nodes at other datacenters. This method has undefined behavior when StoreFeatures.isKeyConsistent() is false. Backends which don't support the notion of "local" strong consistency may return the same configuration returned by #getKeyConsistencyTxConfig().

Specified by:

getLocalKeyConsistentTxConfig in interface StoreFeatures

Returns:

a locally (or globally) key-consistent tx config

hasLocalKeyPartition

public boolean hasLocalKeyPartition()

Specified by:

hasLocalKeyPartition in interface StoreFeatures