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

Class InMemoryStore<V>

java.lang.Object

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

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

All Implemented Interfaces:

AutoCloseable, PersistentStore<V>

public class InMemoryStore<V>
extends BasePersistentStore<V>

Constructor Summary

Constructors

Constructor and Description
InMemoryStore(int capacity)

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
boolean	contains(String key) Checks if lookup key is present in store.
boolean	contains(String key, DataChangeVersion dataChangeVersion) By default contains with version will behave the same way as without version.
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.
V	get(String key, DataChangeVersion dataChangeVersion) By default get with version will behave the same way as without version.
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.
void	put(String key, V value, DataChangeVersion dataChangeVersion) By default put with version will behave the same way as without version.
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

InMemoryStore

public InMemoryStore(int capacity)

Method Detail

delete

public void delete(String key)

Description copied from interface: PersistentStore

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

Parameters:

key - lookup key

getMode

public PersistentStoreMode getMode()

Description copied from interface: PersistentStore

Returns storage mode of this store.

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

contains

public boolean contains(String key,
               DataChangeVersion dataChangeVersion)

Description copied from class: BasePersistentStore

By default contains with version will behave the same way as without version. Override this method to add version support.

Specified by:

contains in interface PersistentStore<V>

Overrides:

contains in class BasePersistentStore<V>

Parameters:

key - lookup key

dataChangeVersion - version holder

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

get

public V get(String key,
    DataChangeVersion dataChangeVersion)

Description copied from class: BasePersistentStore

By default get with version will behave the same way as without version. Override this method to add version support.

Specified by:

get in interface PersistentStore<V>

Overrides:

get in class BasePersistentStore<V>

Parameters:

key - lookup key

dataChangeVersion - version holder

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

put

public void put(String key,
       V value,
       DataChangeVersion dataChangeVersion)

Description copied from class: BasePersistentStore

By default put with version will behave the same way as without version. Override this method to add version support.

Specified by:

put in interface PersistentStore<V>

Overrides:

put in class BasePersistentStore<V>

Parameters:

key - lookup key

value - value to store

dataChangeVersion - version holder

putIfAbsent

public boolean putIfAbsent(String key,
                  V value)

Description copied from interface: PersistentStore

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.

getRange

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

Description copied from interface: PersistentStore

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

close

public void close()
           throws Exception

Throws:

Exception