com.yahoo.bard.webservice.data.cache

Class MemDataCache<T extends Serializable>

java.lang.Object

com.yahoo.bard.webservice.data.cache.MemDataCache<T>

Type Parameters:

T - Type of data

All Implemented Interfaces:

DataCache<T>

Direct Known Subclasses:

MemTupleDataCache

@Singleton
public class MemDataCache<T extends Serializable>
extends Object
implements DataCache<T>

MemCached client implementation of DataCache. Internally uses hashed key to keep under 250 character limit.

Constructor Summary

Constructors

Constructor and Description
MemDataCache() Constructor using a default Memcached Client.
MemDataCache(net.spy.memcached.MemcachedClient client) Constructor.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all of the mappings from this cache.
T	get(String key) Read data from cache.
boolean	set(String key, T value) Put a value on a key in a data cache.

Methods inherited from class java.lang.Object

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

Constructor Detail

MemDataCache

@Inject
public MemDataCache()
                     throws IOException

Constructor using a default Memcached Client.

Throws:

IOException - if the memcached client fails to start

MemDataCache

public MemDataCache(net.spy.memcached.MemcachedClient client)

Constructor.

Parameters:

client - The Memcached client to support this cache

Method Detail

get

public T get(String key)

Description copied from interface: DataCache

Read data from cache.

Specified by:

get in interface DataCache<T extends Serializable>

Parameters:

key - the key whose associated value is to be returned

Returns:

the value to which the specified key is mapped, or null if this map contains no mapping for the key

set

public boolean set(String key,
                   T value)
            throws IllegalStateException

Description copied from interface: DataCache

Put a value on a key in a data cache.

Specified by:

set in interface DataCache<T extends Serializable>

Parameters:

key - the key under which this object should be added.

value - the object to store

Returns:

a boolean representing success of this operation

Throws:

IllegalStateException - in the rare circumstance where queue is too full to accept any more requests

clear

public void clear()

Description copied from interface: DataCache

Removes all of the mappings from this cache.

Specified by:

clear in interface DataCache<T extends Serializable>