RMDatabaseCache.m
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//
// RMDatabaseCache.m
// RouteMe
//
// Created by Joseph Gentle on 19/09/08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//
#import "RMDatabaseCache.h"
#import "RMTileCacheDAO.h"
#import "RMTileImage.h"
#import "RMTile.h"
@implementation RMDatabaseCache
@synthesize databasePath;
+ (NSString*)dbPathForTileSource: (id<RMTileSource>) source usingCacheDir: (BOOL) useCacheDir
{
NSArray *paths;
if (useCacheDir) {
paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
} else {
paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
}
if ([paths count] > 0) // Should only be one...
{
NSString *filename = [NSString stringWithFormat:@"Map%@.sqlite", [source description]];
return [[paths objectAtIndex:0] stringByAppendingPathComponent:filename];
}
return nil;
}
-(id) initWithDatabase: (NSString*)path
{
if (![super init])
return nil;
// NSLog(@"%d items in DB", [[DAO sharedManager] count]);
self.databasePath = path;
dao = [[RMTileCacheDAO alloc] initWithDatabase:path];
if (dao == nil)
return nil;
return self;
}
-(id) initWithTileSource: (id<RMTileSource>) source usingCacheDir: (BOOL) useCacheDir
{
return [self initWithDatabase:[RMDatabaseCache dbPathForTileSource:source usingCacheDir: useCacheDir]];
}
-(void) dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[databasePath release];
[dao release];
[super dealloc];
}
-(void) setPurgeStrategy: (RMCachePurgeStrategy) theStrategy
{
purgeStrategy = theStrategy;
}
-(void) setCapacity: (NSUInteger) theCapacity
{
capacity = theCapacity;
}
-(void) setMinimalPurge: (NSUInteger) theMinimalPurge
{
minimalPurge = theMinimalPurge;
}
-(void)addTile: (RMTile)tile WithImage: (RMTileImage*)image
{
// The tile probably hasn't loaded any data yet... we must be patient.
// However, if the image is already loaded we probably don't need to cache it.
// This will be the case for any other web caches which are active.
if (![image isLoaded])
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(addImageData:)
name:RMMapImageLoadedNotification
object:image];
}
}
-(void) addImageData: (NSNotification *)notification
{
NSData *data = [[notification userInfo] objectForKey:@"data"];
RMTileImage *image = (RMTileImage*)[notification object];
@synchronized (self) {
if (capacity != 0) {
NSUInteger tilesInDb = [dao count];
if (capacity <= tilesInDb) {
[dao purgeTiles: MAX(minimalPurge, 1+tilesInDb-capacity)];
}
}
[dao addData:data LastUsed:[image lastUsedTime] ForTile:RMTileHash([image tile])];
}
[[NSNotificationCenter defaultCenter] removeObserver:self
name:RMMapImageLoadedNotification
object:image];
// NSLog(@"%d items in DB", [dao count]);
}
-(RMTileImage*) cachedImage:(RMTile)tile
{
// NSLog(@"Looking for cached image in DB");
NSData *data = nil;
@synchronized (self) {
data = [dao dataForTile:RMTileHash(tile)];
if (data == nil)
return nil;
if (capacity != 0 && purgeStrategy == RMCachePurgeStrategyLRU) {
[dao touchTile: RMTileHash(tile) withDate: [NSDate date]];
}
}
RMTileImage *image = [RMTileImage imageWithTile:tile FromData:data];
// NSLog(@"DB cache hit for tile %d %d %d", tile.x, tile.y, tile.zoom);
return image;
}
-(void)didReceiveMemoryWarning
{
if (self.databasePath==nil) {
NSLog(@"unknown db path, unable to reinitialize dao!");
return;
}
@synchronized (self) {
[dao release];
dao = [[RMTileCacheDAO alloc] initWithDatabase:self.databasePath];
}
}
@end