org.apache.drill.exec.store.sys.store

Class LocalPersistentStore<V>

java.lang.Object

org.apache.drill.exec.store.sys.BasePersistentStore<V>

org.apache.drill.exec.store.sys.store.LocalPersistentStore<V>

Type Parameters:

V - store data type

All Implemented Interfaces:

AutoCloseable, PersistentStore<V>, Store<V>

public class LocalPersistentStore<V>
extends BasePersistentStore<V>

Local persistent store stores its data on the given file system. Data is stored in the files with key name as a base and ExecConstants.DRILL_SYS_FILE_SUFFIX suffix.

Constructor Summary

Constructors

Constructor and Description
LocalPersistentStore(DrillFileSystem fs, org.apache.hadoop.fs.Path base, PersistentStoreConfig<V> config)

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	contains(String key) Checks if lookup key is present in store.
void	delete(String key) Removes the value corresponding to the given key if exists, nothing happens otherwise.
V	get(String key) Returns the value for the given key if exists, null otherwise.
static DrillFileSystem	getFileSystem(DrillConfig config, org.apache.hadoop.fs.Path root)
static org.apache.hadoop.fs.Path	getLogDir()
PersistentStoreMode	getMode() Returns storage mode of this store.
Iterator<Map.Entry<String,V>>	getRange(int skip, int take) Returns an iterator of desired number of entries offsetting by the skip value.
void	put(String key, V value) Stores the (key, value) tuple in the store.
boolean	putIfAbsent(String key, V value) Stores the (key, value) tuple in the store only if it does not exists.

Methods inherited from class org.apache.drill.exec.store.sys.BasePersistentStore

getAll

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalPersistentStore

public LocalPersistentStore(DrillFileSystem fs,
                            org.apache.hadoop.fs.Path base,
                            PersistentStoreConfig<V> config)

Method Detail

getMode

public PersistentStoreMode getMode()

Description copied from interface: Store

Returns storage mode of this store.

getLogDir

public static org.apache.hadoop.fs.Path getLogDir()

getFileSystem

public static DrillFileSystem getFileSystem(DrillConfig config,
                                            org.apache.hadoop.fs.Path root)
                                     throws IOException

Throws:

IOException

getRange

public Iterator<Map.Entry<String,V>> getRange(int skip,
                                              int take)

Description copied from interface: Store

Returns an iterator of desired number of entries offsetting by the skip value.

Parameters:

skip - number of records to skip from beginning

take - max number of records to return

contains

public boolean contains(String key)

Description copied from interface: PersistentStore

Checks if lookup key is present in store.

Parameters:

key - lookup key

Returns:

true if store contains lookup key, false otherwise

get

public V get(String key)

Description copied from interface: PersistentStore

Returns the value for the given key if exists, null otherwise.

Parameters:

key - lookup key

put

public void put(String key,
                V value)

Description copied from interface: PersistentStore

Stores the (key, value) tuple in the store. Lifetime of the tuple depends upon store mode.

Parameters:

key - lookup key

value - value to store

putIfAbsent

public boolean putIfAbsent(String key,
                           V value)

Description copied from interface: Store

Stores the (key, value) tuple in the store only if it does not exists.

Parameters:

key - lookup key

value - value to store

Returns:

true if put takes place, false otherwise.

delete

public void delete(String key)

Description copied from interface: Store

Removes the value corresponding to the given key if exists, nothing happens otherwise.

Parameters:

key - lookup key

close

public void close()