RMTileCache.h
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//
// RMTileCache.h
//
// Copyright (c) 2008-2009, Route-Me Contributors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
#import <Foundation/Foundation.h>
#import "RMTile.h"
#import "RMTileSource.h"
#import "RMCacheObject.h"
@class RMTileImage, RMMemoryCache;
typedef enum {
RMCachePurgeStrategyLRU,
RMCachePurgeStrategyFIFO,
} RMCachePurgeStrategy;
#pragma mark -
@protocol RMTileCache <NSObject>
// Returns the cached image if it exists. nil otherwise.
- (UIImage *)cachedImage:(RMTile)tile withCacheKey:(NSString *)cacheKey;
- (void)didReceiveMemoryWarning;
@optional
- (void)addImage:(UIImage *)image forTile:(RMTile)tile withCacheKey:(NSString *)cacheKey;
// removes all tile images from the memory and disk subcaches
- (void)removeAllCachedImages;
@end
#pragma mark -
@interface RMTileCache : NSObject <RMTileCache>
{
NSMutableArray *caches;
// The memory cache, if we have one
// This one has its own variable because we want to propagate cache hits down in
// the cache hierarchy up to the memory cache
RMMemoryCache *memoryCache;
NSTimeInterval expiryPeriod;
}
- (id)initWithExpiryPeriod:(NSTimeInterval)period;
+ (NSNumber *)tileHash:(RMTile)tile;
// Add another cache to the chain
- (void)addCache:(id <RMTileCache>)cache;
- (void)didReceiveMemoryWarning;
@end