From 9d52266f823daf5cb83e3eebe1b9f57594bc9d4a Mon Sep 17 00:00:00 2001
From: matt handler <matt.handler@gmail.com>
Date: Wed, 20 Apr 2011 14:39:20 -0400
Subject: first commit

---
 Classes/HJMOBigFileCache.m | 94 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100755 Classes/HJMOBigFileCache.m

(limited to 'Classes/HJMOBigFileCache.m')

diff --git a/Classes/HJMOBigFileCache.m b/Classes/HJMOBigFileCache.m
new file mode 100755
index 0000000..f1a8725
--- /dev/null
+++ b/Classes/HJMOBigFileCache.m
@@ -0,0 +1,94 @@
+//
+//  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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