class Cache implements Ehcache {

    public final Set getKeysForGroup(Object groupKey) throws IllegalStateException, CacheException {
        Element groupE = get(groupKey);
        if (groupE == null) {
            return null;
        }
        if (groupE instanceof GroupElement) {
            GroupElement group = (GroupElement) groupE;
            return group.getMemberKeys();
        } else {
            //we should have got a GroupElement, but got some other type
            throw new CacheException("The groupKey " + groupKey
                    + " references  a non-group element;"
                    + " GroupKeys co-exist in the same namespace "
                    + " as regular Elements - cache users are responsible of ensuring "
                    + " that namespace collisions do not occur");
        }
    }

    public  Cache(String name, int maxElementsInMemory, boolean overflowToDisk,
                 boolean eternal, long timeToLiveSeconds, long timeToIdleSeconds);
    public  Cache(String name,
                 int maxElementsInMemory,
                 boolean overflowToDisk,
                 boolean eternal,
                 long timeToLiveSeconds,
                 long timeToIdleSeconds,
                 boolean diskPersistent,
                 long diskExpiryThreadIntervalSeconds);
    public  Cache(String name,
                 int maxElementsInMemory,
                 MemoryStoreEvictionPolicy memoryStoreEvictionPolicy,
                 boolean overflowToDisk,
                 String diskStorePath,
                 boolean eternal,
                 long timeToLiveSeconds,
                 long timeToIdleSeconds,
                 boolean diskPersistent,
                 long diskExpiryThreadIntervalSeconds,
                 RegisteredEventListeners registeredEventListeners);
    public  Cache(String name,
                 int maxElementsInMemory,
                 MemoryStoreEvictionPolicy memoryStoreEvictionPolicy,
                 boolean overflowToDisk,
                 String diskStorePath,
                 boolean eternal,
                 long timeToLiveSeconds,
                 long timeToIdleSeconds,
                 boolean diskPersistent,
                 long diskExpiryThreadIntervalSeconds,
                 RegisteredEventListeners registeredEventListeners,
                 BootstrapCacheLoader bootstrapCacheLoader);
    public  Cache(String name,
                 int maxElementsInMemory,
                 MemoryStoreEvictionPolicy memoryStoreEvictionPolicy,
                 boolean overflowToDisk,
                 String diskStorePath,
                 boolean eternal,
                 long timeToLiveSeconds,
                 long timeToIdleSeconds,
                 boolean diskPersistent,
                 long diskExpiryThreadIntervalSeconds,
                 RegisteredEventListeners registeredEventListeners,
                 BootstrapCacheLoader bootstrapCacheLoader,
                 int maxElementsOnDisk);
    public  Cache(String name,
                 int maxElementsInMemory,
                 MemoryStoreEvictionPolicy memoryStoreEvictionPolicy,
                 boolean overflowToDisk,
                 String diskStorePath,
                 boolean eternal,
                 long timeToLiveSeconds,
                 long timeToIdleSeconds,
                 boolean diskPersistent,
                 long diskExpiryThreadIntervalSeconds,
                 RegisteredEventListeners registeredEventListeners,
                 BootstrapCacheLoader bootstrapCacheLoader,
                 int maxElementsOnDisk,
                 int diskSpoolBufferSizeMB);

}