Package com.mapr.kvstore

Class HashedStringKvStore

java.lang.Object

com.mapr.kvstore.HashedStringKvStore

All Implemented Interfaces:

KvTable<String>

public class HashedStringKvStore
extends Object
implements KvTable<String>

MapR Filesystem based implementation of Key-Value table interface. Which uses Key as Hash(String)

See Also:

• KvTable

Constructor Summary

Constructors

Constructor	Description
HashedStringKvStore(KvTable<com.google.protobuf.ByteString> kvTable)

Method Summary

Modifier and Type	Method	Description
int	addDeleteOp(KvDatabaseOp op, String key, HashSet<HashedStringKvStore> pendingUnlockTables)
int	addInsertOp(KvDatabaseOp op, String key, int val, boolean skipCollisionCountUpdate, boolean verifyKey, HashSet<HashedStringKvStore> pendingUnlockTables)
void	close()
boolean	exists(String keyValue)	Cognate of KvTable.lookup(Object, boolean), this function checks for the presence of an entry with a specific key.
KvTableScanner	getHashedStringScanner()
int	getKeyCnt()
String	getKeyFromKvStoreKey(com.mapr.fs.proto.Fileserver.KvStoreKey key)
long	getKvVersion()
com.mapr.fs.proto.Fileserver.KvMsg	getLeftNearValue(String key)
com.mapr.fs.proto.Fileserver.KvStoreKey	getMaxKey()
com.mapr.fs.proto.Fileserver.KvStoreKey	getMinKey()
com.mapr.fs.proto.Fileserver.KvMsg	getRightNearValue(String key)
Scanner	getScanner(boolean keysOnly)
Scanner	getScanner(String startKey, boolean keysOnly)
Scanner	getScanner(String startKey, String endKey, boolean keysOnly)
String	getTableName()
int	insertCollisionCount(KvDatabaseOp op, HashSet<HashedStringKvStore> pendingUnlockTables)
boolean	isExistCollisionKey()
byte[]	lookup(String keyValue)
byte[]	lookup(String keyValue, boolean allowStaleRead)
long	lookupCollisionNr()
com.mapr.fs.proto.Fileserver.KvstoreLookupNearResponse	lookupNear(String key)
int	open(String name)	Initializes in-memory state of the table, such as setting key type (where necessary).
void	releaseUpdateLock()
void	setType(int type)
void	setVarKeyType(String type)

Methods inherited from class java.lang.Object

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

Constructor Details

HashedStringKvStore

public HashedStringKvStore(KvTable<com.google.protobuf.ByteString> kvTable)

Method Details

open

public int open(String name)

Description copied from interface: KvTable

Initializes in-memory state of the table, such as setting key type (where necessary).

Specified by:

open in interface KvTable<String>

Parameters:

name - name of the key-value table to be initialized

Returns:

getTableName

public String getTableName()

Specified by:

getTableName in interface KvTable<String>

close

public void close()

Specified by:

close in interface KvTable<String>

getKvVersion

public long getKvVersion()

Specified by:

getKvVersion in interface KvTable<String>

setVarKeyType

public void setVarKeyType(String type)

Specified by:

setVarKeyType in interface KvTable<String>

lookup

public byte[] lookup(String keyValue)

Specified by:

lookup in interface KvTable<String>

lookup

public byte[] lookup(String keyValue,
 boolean allowStaleRead)

Specified by:

lookup in interface KvTable<String>

getLeftNearValue

public com.mapr.fs.proto.Fileserver.KvMsg getLeftNearValue(String key)

Specified by:

getLeftNearValue in interface KvTable<String>

getRightNearValue

public com.mapr.fs.proto.Fileserver.KvMsg getRightNearValue(String key)

Specified by:

getRightNearValue in interface KvTable<String>

lookupNear

public com.mapr.fs.proto.Fileserver.KvstoreLookupNearResponse lookupNear(String key)
                                                                  throws KvStoreException

Specified by:

lookupNear in interface KvTable<String>

Throws:

KvStoreException

getMinKey

public com.mapr.fs.proto.Fileserver.KvStoreKey getMinKey()

Specified by:

getMinKey in interface KvTable<String>

getMaxKey

public com.mapr.fs.proto.Fileserver.KvStoreKey getMaxKey()

Specified by:

getMaxKey in interface KvTable<String>

getKeyCnt

public int getKeyCnt()

Specified by:

getKeyCnt in interface KvTable<String>

exists

public boolean exists(String keyValue)

Description copied from interface: KvTable

Cognate of KvTable.lookup(Object, boolean), this function checks for the presence of an entry with a specific key.

Specified by:

exists in interface KvTable<String>

Returns:

getKeyFromKvStoreKey

public String getKeyFromKvStoreKey(com.mapr.fs.proto.Fileserver.KvStoreKey key)

Specified by:

getKeyFromKvStoreKey in interface KvTable<String>

getScanner

public Scanner getScanner(String startKey,
 String endKey,
 boolean keysOnly)

Specified by:

getScanner in interface KvTable<String>

getScanner

public Scanner getScanner(String startKey,
 boolean keysOnly)

Specified by:

getScanner in interface KvTable<String>

getScanner

public Scanner getScanner(boolean keysOnly)

Specified by:

getScanner in interface KvTable<String>

getHashedStringScanner

public KvTableScanner getHashedStringScanner()

Specified by:

getHashedStringScanner in interface KvTable<String>

setType

public void setType(int type)

Specified by:

setType in interface KvTable<String>

lookupCollisionNr

public long lookupCollisionNr()

Specified by:

lookupCollisionNr in interface KvTable<String>

isExistCollisionKey

public boolean isExistCollisionKey()

Specified by:

isExistCollisionKey in interface KvTable<String>

addInsertOp

public int addInsertOp(KvDatabaseOp op,
 String key,
 int val,
 boolean skipCollisionCountUpdate,
 boolean verifyKey,
 HashSet<HashedStringKvStore> pendingUnlockTables)

insertCollisionCount

public int insertCollisionCount(KvDatabaseOp op,
 HashSet<HashedStringKvStore> pendingUnlockTables)

addDeleteOp

public int addDeleteOp(KvDatabaseOp op,
 String key,
 HashSet<HashedStringKvStore> pendingUnlockTables)

releaseUpdateLock

public void releaseUpdateLock()