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//
// HJMOBigFileCache.m
// hjlib
//
// Copyright Hunter and Johnson 2009, 2010, 2011
// HJCache may be used freely in any iOS or Mac application free or commercial.
// May be redistributed as source code only if all the original files are included.
// See http://www.markj.net/hjcache-iphone-image-cache/
#import "HJMOBigFileCache.h"
NSString* HJMOBigFileCache_trimDirKey = @"HJMOBigFileCacheTrimDir";
NSString* HJMOBigFileCache_trimDateKey = @"HJMOBigFileCacheTrimDate";
@implementation HJMOBigFileCache
@synthesize lastTrimDate;
@synthesize lastTrimDirNum;
- (void) dealloc {
[lastTrimDirNum release];
[lastTrimDate release];
[super dealloc];
}
-(void)createCacheDirsIfNeeded {
[super createCacheDirsIfNeeded];
for (int i=0; i<=9; i++) {
NSString* path = [NSString stringWithFormat:@"%@%i",readyPath,i];
[[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
}
}
-(NSString*)subdirForFilename:(NSString*)filename {
unichar c1 = [filename characterAtIndex:[filename length]-1];
unichar c2 = [filename characterAtIndex:[filename length]-2];
int hashpath = (c1+c2)%10;
return [NSString stringWithFormat:@"%i",hashpath];
}
-(NSString*)readyFilePathForOid:(id)oid {
NSString* filename = [self filenameForOid:oid];
NSString* subdir = [self subdirForFilename:filename];
NSString* path;
if (subdir==nil) {
path = [readyPath stringByAppendingString:filename];
} else {
path = [NSString stringWithFormat:@"%@%@/%@",readyPath,subdir,filename];
}
return path;
}
-(void)updateLastTrimState {
[[NSUserDefaults standardUserDefaults] setObject:self.lastTrimDirNum forKey:HJMOBigFileCache_trimDirKey];
[[NSUserDefaults standardUserDefaults] setObject:self.lastTrimDate forKey:HJMOBigFileCache_trimDateKey];
[[NSUserDefaults standardUserDefaults] synchronize];
}
/*
This only trims 1/10th of the cache at a time, and does this no more than once every 1hrs.
*/
-(void)trimCache {
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
self.lastTrimDirNum = (NSNumber*) [[NSUserDefaults standardUserDefaults] objectForKey:HJMOBigFileCache_trimDirKey];
self.lastTrimDate = (NSDate*) [[NSUserDefaults standardUserDefaults] objectForKey:HJMOBigFileCache_trimDateKey];
NSDate* now = [[[NSDate alloc] init] autorelease];
if (lastTrimDate==nil || [now timeIntervalSinceDate:lastTrimDate]>60*60*1) {
if (lastTrimDirNum==nil) {
self.lastTrimDirNum = [NSNumber numberWithInt:-1];
}
int num = [lastTrimDirNum intValue];
num++;
if (num>=10) { num=0; }
NSString* nextTrimPath = [NSString stringWithFormat:@"%@%i/",readyPath,num];
[self trimCacheDir:nextTrimPath];
self.lastTrimDate = now;
self.lastTrimDirNum = [NSNumber numberWithInt:num];
[self updateLastTrimState];
}
[self performSelectorOnMainThread:@selector(updateLastTrimState) withObject:nil waitUntilDone:YES];
[pool release];
}
@end
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