net.dongliu.direct.cache

类 DirectCache

java.lang.Object

net.dongliu.direct.cache.DirectCache

public class DirectCache
extends Object

LRU, direct-memory cache. both key and value cannot be null. Both key and value cannot be null

作者:

dongliu

方法概要

限定符和类型	方法和说明
boolean	add(Object key, byte[] value, int expiry) Put an element in the store only if no element is currently mapped to the elements key.
<T> boolean	add(Object key, T value, ValueSerializer<T> serializer) Put an element in the store only if no element is currently mapped to the elements key.
<T> boolean	add(Object key, T value, ValueSerializer<T> serializer, int expiry) Put an element in the store only if no element is currently mapped to the elements key.
void	destroy() destroy cache, dispose all resources.
boolean	exists(Object key) to see weather the key exists or not.if the entry is expired still return true.
byte[]	get(Object key) retrieve node by key from cache.
<T> T	get(Object key, ValueSerializer<T> serializer) retrieve node by key from cache.
Collection<Object>	keys() return all keys cached.
static DirectCacheBuilder	newBuilder()
long	offHeapSize() return the actualUsed off-heap memory in bytes.
void	remove(Object key) remove key from cache
void	set(Object key, byte[] value) set a value.if already exist, replace it
void	set(Object key, byte[] value, int expiry) set a value. if already exist, replace it
<T> void	set(Object key, T value, ValueSerializer<T> serializer) set a value.if already exist, replace it
<T> void	set(Object key, T value, ValueSerializer<T> serializer, int expiry) set a value. if already exist, replace it
long	size() the num of cache entries.

从类继承的方法 java.lang.Object

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

方法详细资料

newBuilder

public static DirectCacheBuilder newBuilder()

get

public <T> T get(Object key,
                 ValueSerializer<T> serializer)

retrieve node by key from cache.

返回:

null if not exists

get

public byte[] get(Object key)

retrieve node by key from cache.

返回:

null if not exists

set

public <T> void set(Object key,
                    T value,
                    ValueSerializer<T> serializer)

set a value.if already exist, replace it

参数:

value - cannot be null

set

public <T> void set(Object key,
                    T value,
                    ValueSerializer<T> serializer,
                    int expiry)

set a value. if already exist, replace it

参数:

expiry - The amount of time for the element to live, in seconds.

value - cannot be null

set

public void set(Object key,
                byte[] value)

set a value.if already exist, replace it

参数:

value - cannot be null

set

public void set(Object key,
                byte[] value,
                int expiry)

set a value. if already exist, replace it

参数:

expiry - The amount of time for the element to live, in seconds.

value - cannot be null

add

public <T> boolean add(Object key,
                       T value,
                       ValueSerializer<T> serializer)

Put an element in the store only if no element is currently mapped to the elements key.

返回:

true if the key is not in cache(even if put op is failed), false otherwise.

add

public <T> boolean add(Object key,
                       T value,
                       ValueSerializer<T> serializer,
                       int expiry)

Put an element in the store only if no element is currently mapped to the elements key.

参数:

expiry - The amount of time for the element to live, in seconds.

返回:

true if the key is not in cache(even if put op is failed), false otherwise.

add

public boolean add(Object key,
                   byte[] value,
                   int expiry)

Put an element in the store only if no element is currently mapped to the elements key.

参数:

expiry - The amount of time for the element to live, in seconds.

返回:

true if the key is not in cache(even if put op is failed), false otherwise.

exists

public boolean exists(Object key)

to see weather the key exists or not.if the entry is expired still return true.

返回:

true if key exists.

keys

public Collection<Object> keys()

return all keys cached.

destroy

public void destroy()

destroy cache, dispose all resources.

size

public long size()

the num of cache entries.

remove

public void remove(Object key)

remove key from cache

offHeapSize

public long offHeapSize()

return the actualUsed off-heap memory in bytes.