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#import "MGLFileCache.h"
@interface MGLFileCache ()
@property (nonatomic) MGLFileCache *sharedInstance;
@property (nonatomic) mbgl::SQLiteCache *sharedCache;
@property (nonatomic) NSHashTable *retainers;
@end
@implementation MGLFileCache
const std::string &defaultCacheDatabasePath() {
static const std::string path = []() -> std::string {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
if ([paths count] == 0) {
// Disable the cache if we don't have a location to write.
return "";
}
NSString *libraryDirectory = [paths objectAtIndex:0];
return [[libraryDirectory stringByAppendingPathComponent:@"cache.db"] UTF8String];
}();
return path;
}
- (instancetype)init {
self = [super init];
if (self) {
_retainers = [NSHashTable weakObjectsHashTable];
}
return self;
}
+ (instancetype)sharedInstance {
static dispatch_once_t onceToken;
static MGLFileCache *_sharedInstance;
dispatch_once(&onceToken, ^{
_sharedInstance = [[self alloc] init];
});
return _sharedInstance;
}
- (void)teardown {
if (self.sharedCache) {
delete self.sharedCache;
self.sharedCache = nullptr;
}
}
- (void)dealloc {
[self.retainers removeAllObjects];
[self teardown];
}
+ (mbgl::SQLiteCache *)obtainSharedCacheWithObject:(NSObject *)object {
return [[MGLFileCache sharedInstance] obtainSharedCacheWithObject:object];
}
- (mbgl::SQLiteCache *)obtainSharedCacheWithObject:(NSObject *)object {
assert([[NSThread currentThread] isMainThread]);
if (!self.sharedCache) {
self.sharedCache = new mbgl::SQLiteCache(defaultCacheDatabasePath());
}
[self.retainers addObject:object];
return self.sharedCache;
}
+ (void)releaseSharedCacheForObject:(NSObject *)object {
return [[MGLFileCache sharedInstance] releaseSharedCacheForObject:object];
}
- (void)releaseSharedCacheForObject:(NSObject *)object {
assert([[NSThread currentThread] isMainThread]);
if ([self.retainers containsObject:object]) {
[self.retainers removeObject:object];
}
if ([self.retainers count] == 0) {
[self teardown];
}
}
@end
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