IRWebAPIKit/IRWebAPIEngine+LocalCaching.m at develop · waveface/IRWebAPIKit · GitHub

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//
//  IRWebAPIEngine+LocalCaching.m
//  IRWebAPIKit
//
//  Created by Evadne Wu on 1/23/11.
//  Copyright 2011 Iridia Productions. All rights reserved.
//

#import <objc/runtime.h>

#import "IRWebAPIEngine+LocalCaching.h"
#import "IRWebAPIHelpers.h"

static NSString * const kCacheFileURLS = @"-[IRWebAPIRequestContext(LocalCaching) cacheFileURLs]";

@implementation IRWebAPIRequestContext (LocalCaching)

- (NSArray *) cacheFileURLs {

	return [objc_getAssociatedObject(self, &kCacheFileURLS) copy];

}

- (void) removeAllCacheFileURLValues {

	[self willChangeValueForKey:@"cacheFileURLs"];
	objc_setAssociatedObject(self, &kCacheFileURLS, nil, OBJC_ASSOCIATION_ASSIGN);
	[self didChangeValueForKey:@"cacheFileURLs"];

}

- (void) addCacheFileURL:(NSURL *)obj {

	NSMutableArray *cacheFileURLs = objc_getAssociatedObject(self, &kCacheFileURLS);

	if (!cacheFileURLs) {
		cacheFileURLs = [NSMutableArray array];
		objc_setAssociatedObject(self, &cacheFileURLs, cacheFileURLs, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
	}

	[self willChangeValueForKey:@"cacheFileURLs"];

	if (obj) {
		[cacheFileURLs addObject:obj];
	} else {
		[cacheFileURLs removeObject:obj];
	}

	[self didChangeValueForKey:@"cacheFileURLs"];

}

@end


@implementation IRWebAPIEngine (LocalCaching)

+ (NSURL *) newTemporaryFileURL {

	NSString *applicationCacheDirectory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
	NSString *preferredCacheDirectoryPath = [applicationCacheDirectory stringByAppendingPathComponent:NSStringFromClass([self class])];

	if ([[NSFileManager defaultManager] createDirectoryAtPath:preferredCacheDirectoryPath withIntermediateDirectories:YES attributes:nil error:nil])
		return [NSURL fileURLWithPath:[preferredCacheDirectoryPath stringByAppendingPathComponent:IRWebAPIKitNonce()]];

	return nil;

}


+ (BOOL) cleanUpTemporaryFileAtURL:(NSURL *)inTemporaryFileURL {

	return [[NSFileManager defaultManager] removeItemAtURL:inTemporaryFileURL error:nil];

}


+ (IRWebAPIResponseContextTransformer) defaultCleanUpTemporaryFilesResponseTransformer {

	return [(^ (NSDictionary *inParsedResponse, IRWebAPIRequestContext *inResponseContext) {

		NSArray *cachedFileURLs = inResponseContext.cacheFileURLs;

		dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^ {

			for (NSURL *aFileURL in cachedFileURLs)
				[self cleanUpTemporaryFileAtURL:aFileURL];

		});

		return inParsedResponse;

	}) copy];

}

@end