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<?php
declare(strict_types=1);
namespace Doctrine\ORM\Cache;
/**
* Defines contract for concurrently managed data region.
* It should be able to lock an specific cache entry in an atomic operation.
*
* When a entry is locked another process should not be able to read or write the entry.
* All evict operation should not consider locks, even though an entry is locked evict should be able to delete the entry and its lock.
*/
interface ConcurrentRegion extends Region
{
/**
* Attempts to read lock the mapping for the given key.
*
* @param CacheKey $key The key of the item to lock.
*
* @return Lock|null A lock instance or NULL if the lock already exists.
*
* @throws LockException Indicates a problem accessing the region.
*/
public function lock(CacheKey $key);
/**
* Attempts to read unlock the mapping for the given key.
*
* @param CacheKey $key The key of the item to unlock.
* @param Lock $lock The lock previously obtained from {@link readLock}
*
* @return bool
*
* @throws LockException Indicates a problem accessing the region.
*/
public function unlock(CacheKey $key, Lock $lock);
}
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