Package jadex.collection

Class Cache

java.lang.Object

jadex.collection.Cache

public class Cache
extends Object

Cache that provide expiration in case of a) timetolive is exceeded b) the max number of data has been reached (lru behaviour)

Field Summary

Fields

Modifier and Type	Field	Description
static final long	DEFAULT_TIME_TO_LIVE	The default time to live time span (5 mins).
protected LRU	lru	The lru.
protected long	ttl	The time to live.

Constructor Summary

Constructors

Constructor	Description
Cache(int max)	Create a new cache.
Cache(int max, long ttl)	Create a new cache.
Cache(LRU lru, long ttl)	Create a new cache.

Method Summary

Modifier and Type	Method	Description
boolean	canExpire(Object key)	Test if an entry can expire.
boolean	containsKey(Object key)	Test if a key is contained.
Object	get(Object key, long now)	Get data from the cache.
void	put(Object key, Object value, long now)	Put an entry in the cache.
void	put(Object key, Object value, long now, long ttl)	Put an entry in the cache.
boolean	remove(Object key)	Remove an entry.
int	size()	Get the size.

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_TIME_TO_LIVE

public static final long DEFAULT_TIME_TO_LIVE

The default time to live time span (5 mins).

See Also:

• Constant Field Values

lru

protected LRU lru

The lru.

ttl

protected long ttl

The time to live.

Constructor Details

Cache

public Cache(int max)

Create a new cache.

Cache

public Cache(int max,
 long ttl)

Create a new cache.

Cache

public Cache(LRU lru,
 long ttl)

Create a new cache.

Method Details

put

public void put(Object key,
 Object value,
 long now)

Put an entry in the cache.

Parameters:

key - The key.

value - The value.

now - The current time.

put

public void put(Object key,
 Object value,
 long now,
 long ttl)

Put an entry in the cache.

Parameters:

key - The key.

value - The value.

now - The current time (-1 for never expire).

get

public Object get(Object key,
 long now)

Get data from the cache.

Parameters:

key - The key.

now - The current time (-1 for never expire).

Returns:

The cached object.

remove

public boolean remove(Object key)

Remove an entry.

Parameters:

key - The key.

containsKey

public boolean containsKey(Object key)

Test if a key is contained.

Parameters:

key - The key.

Returns:

True if contained.

canExpire

public boolean canExpire(Object key)

Test if an entry can expire.

Parameters:

key - The key.

Returns:

True, if entry can expire.

size

public int size()

Get the size.

Returns:

The size.