org.apache.ignite.internal.processors.cache

Class CacheEvictableEntryImpl<K,V>

java.lang.Object

org.apache.ignite.internal.processors.cache.CacheEvictableEntryImpl<K,V>

All Implemented Interfaces:

javax.cache.Cache.Entry<K,V>, EvictableEntry<K,V>

public class CacheEvictableEntryImpl<K,V>
extends Object
implements EvictableEntry<K,V>

Entry wrapper that never obscures obsolete entries from user.

Field Summary

Fields

Modifier and Type	Field and Description
protected GridCacheEntryEx	cached Cached entry.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CacheEvictableEntryImpl(GridCacheEntryEx cached)

Method Summary

Modifier and Type	Method and Description
<T> T	addMeta(T val) Adds a new metadata.
boolean	equals(Object obj)
boolean	evict() Evicts entry associated with given key from cache.
K	getKey()
V	getValue()
int	hashCode()
boolean	isCached() Checks whether entry is currently present in cache or not.
<T> T	meta() Gets metadata added by eviction policy.
V	peek()
<T> T	putMetaIfAbsent(T val) Adds given metadata value only if it was absent.
<T> T	removeMeta() Removes metadata by name.
<T> boolean	removeMeta(T val) Removes metadata only if its current value is equal to val passed in.
<T> boolean	replaceMeta(T curVal, T newVal) Replaces given metadata with new newVal value only if its current value is equal to curVal.
int	size() Returns entry size in bytes.
String	toString()
<T> T	unwrap(Class<T> clazz)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

cached

@GridToStringInclude
protected GridCacheEntryEx cached

Cached entry.

Constructor Detail

CacheEvictableEntryImpl

protected CacheEvictableEntryImpl(GridCacheEntryEx cached)

Parameters:

cached - Cached entry.

Method Detail

getKey

public K getKey()
         throws IllegalStateException

Specified by:

getKey in interface javax.cache.Cache.Entry<K,V>

Throws:

IllegalStateException

isCached

public boolean isCached()

Checks whether entry is currently present in cache or not. If entry is not in cache (e.g. has been removed) false is returned. In this case all operations on this entry will cause creation of a new entry in cache.

Specified by:

isCached in interface EvictableEntry<K,V>

Returns:

True if entry is in cache, false otherwise.

evict

public boolean evict()

Evicts entry associated with given key from cache. Note, that entry will be evicted only if it's not used (not participating in any locks or transactions).

Specified by:

evict in interface EvictableEntry<K,V>

Returns:

True if entry could be evicted, false otherwise.

peek

@Nullable
public V peek()

Returns:

Peeks value.

size

public int size()

Returns entry size in bytes.

Specified by:

size in interface EvictableEntry<K,V>

Returns:

entry size in bytes.

getValue

public V getValue()

Specified by:

getValue in interface javax.cache.Cache.Entry<K,V>

addMeta

@Nullable
public <T> T addMeta(T val)

Adds a new metadata.

Specified by:

addMeta in interface EvictableEntry<K,V>

Parameters:

val - Metadata value.

Returns:

Metadata previously added, or null if there was none.

meta

@Nullable
public <T> T meta()

Gets metadata added by eviction policy.

Specified by:

meta in interface EvictableEntry<K,V>

Returns:

Metadata value or null.

removeMeta

@Nullable
public <T> T removeMeta()

Removes metadata by name.

Specified by:

removeMeta in interface EvictableEntry<K,V>

Returns:

Value of removed metadata or null.

removeMeta

public <T> boolean removeMeta(T val)

Removes metadata only if its current value is equal to val passed in.

Specified by:

removeMeta in interface EvictableEntry<K,V>

Parameters:

val - Value to compare.

Returns:

True if value was removed, false otherwise.

putMetaIfAbsent

@Nullable
public <T> T putMetaIfAbsent(T val)

Adds given metadata value only if it was absent.

Specified by:

putMetaIfAbsent in interface EvictableEntry<K,V>

Parameters:

val - Value to add if it's not attached already.

Returns:

null if new value was put, or current value if put didn't happen.

replaceMeta

public <T> boolean replaceMeta(T curVal,
                               T newVal)

Replaces given metadata with new newVal value only if its current value is equal to curVal. Otherwise, it is no-op.

Specified by:

replaceMeta in interface EvictableEntry<K,V>

Parameters:

curVal - Current value to check.

newVal - New value.

Returns:

true if replacement occurred, false otherwise.

unwrap

public <T> T unwrap(Class<T> clazz)

Specified by:

unwrap in interface javax.cache.Cache.Entry<K,V>

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object