Package com.landawn.abacus.cache

Class OffHeapCache<K,V>

java.lang.Object

com.landawn.abacus.cache.AbstractCache<K,V>

com.landawn.abacus.cache.OffHeapCache<K,V>

Type Parameters:

K - the key type

V - the value type

All Implemented Interfaces:

Cache<K,V>, Closeable, AutoCloseable

public class OffHeapCache<K,V>
extends AbstractCache<K,V>

It's not designed for tiny objects(length of bytes < 128 after serialization). Since it's off heap cache, modifying the objects from cache won't impact the objects in cache.

Since:

0.8

Author:

haiyang li

Field Summary

Fields inherited from interface com.landawn.abacus.cache.Cache

DEFAULT_LIVE_TIME, DEFAULT_MAX_IDLE_TIME

Constructor Summary

Constructors

Constructor	Description
OffHeapCache(int sizeMB)	The memory with the specified size of MB will be allocated at application start up.
OffHeapCache(int sizeMB, long evictDelay)	The memory with the specified size of MB will be allocated at application start up.
OffHeapCache(int sizeMB, long evictDelay, long defaultLiveTime, long defaultMaxIdleTime)	The memory with the specified size of MB will be allocated at application start up.

Method Summary

Modifier and Type	Method	Description
void	clear()	Clear.
void	close()	Close.
boolean	containsKey(K k)
V	gett(K k)	Gets the t.
boolean	isClosed()	Checks if is closed.
Set<K>	keySet()
boolean	put(K k, V v, long liveTime, long maxIdleTime)
void	remove(K k)
int	size()

Methods inherited from class com.landawn.abacus.cache.AbstractCache

asyncContainsKey, asyncGet, asyncGett, asyncPut, asyncPut, asyncRemove, get, getProperties, getProperty, put, removeProperty, setProperty

Methods inherited from class java.lang.Object

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

Constructor Details

OffHeapCache

public OffHeapCache(int sizeMB)

The memory with the specified size of MB will be allocated at application start up.

Parameters:

sizeMB -

OffHeapCache

public OffHeapCache(int sizeMB,
 long evictDelay)

The memory with the specified size of MB will be allocated at application start up.

Parameters:

sizeMB -

evictDelay - unit is milliseconds

OffHeapCache

public OffHeapCache(int sizeMB,
 long evictDelay,
 long defaultLiveTime,
 long defaultMaxIdleTime)

The memory with the specified size of MB will be allocated at application start up.

Parameters:

sizeMB -

evictDelay - unit is milliseconds

defaultLiveTime - unit is milliseconds

defaultMaxIdleTime - unit is milliseconds

Method Details

gett

public V gett(K k)

Gets the t.

Parameters:

k -

Returns:

put

public boolean put(K k,
 V v,
 long liveTime,
 long maxIdleTime)

Parameters:

k -

v -

liveTime -

maxIdleTime -

Returns:

true, if successful

remove

public void remove(K k)

Parameters:

k -

containsKey

public boolean containsKey(K k)

Parameters:

k -

Returns:

true, if successful

keySet

public Set<K> keySet()

Returns:

size

public int size()

Returns:

clear

public void clear()

Clear.

close

public void close()

Close.

isClosed

public boolean isClosed()

Checks if is closed.

Returns:

true, if is closed