@class NSString, NSMapTable, NSMutableSet, NSCondition, NSObject;
@protocol OS_dispatch_group, OS_dispatch_semaphore, HDDatabaseConnectionPoolDelegate;
@interface HDDatabaseConnectionPool : NSObject <HDDiagnosticObject> {
NSCondition *_cacheCondition;
NSMutableSet *_cache;
NSObject<OS_dispatch_group> *_flushGroup;
unsigned long long _cacheGeneration;
long long _cacheSize;
long long _concurrentReaderLimit;
_Atomic int _count;
struct os_unfair_lock_s { unsigned int _os_unfair_lock_opaque; } _checkoutLock;
NSMapTable *_checkoutMap;
NSObject<OS_dispatch_semaphore> *_readerSemaphore;
NSObject<OS_dispatch_semaphore> *_writerSemaphore;
}
@property (readonly, weak, nonatomic) id<HDDatabaseConnectionPoolDelegate> delegate;
@property (readonly, nonatomic) long long count;
@property (readonly, nonatomic) long long cacheSize;
@property (readonly, nonatomic) long long concurrentReaderLimit;
@property (readonly, nonatomic) long long checkedOutDatabaseCount;
@property (readonly) unsigned long long hash;
@property (readonly) Class superclass;
@property (readonly, copy) NSString *description;
@property (readonly, copy) NSString *debugDescription;
- (void)dealloc;
- (id)flush;
- (id)diagnosticDescription;
- (void).cxx_destruct;
- (void)checkInConnection:(id)a0 flushImmediately:(BOOL)a1;
- (id)checkOutConnectionWithOptions:(unsigned long long)a0 error:(id *)a1;
- (id)initWithConcurrentReaderLimit:(long long)a0 delegate:(id)a1;
- (id)currentFlushGroup;
@end