IRWebAPIKit/IRWebAPIEngine+LocalCaching.m at develop · iridia/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"


NSString * const kIRWebAPIEngineRequestContextLocalCachingTemporaryFileURLsKey = @"kIRWebAPIEngineRequestContextLocalCachingTemporaryFileURLsKey";
NSString * const kIRWebAPIEngineLocallocalCacheDirectoryPath = @"kIRWebAPIEngineLocalCachingBasePath";


@implementation IRWebAPIEngine (LocalCaching)

+ (NSURL *) newTemporaryFileURL {

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

	NSError *error;
	if (![[NSFileManager defaultManager] createDirectoryAtPath:preferredCacheDirectoryPath withIntermediateDirectories:YES attributes:nil error:&error]) {

		NSLog(@"Erorr occurred while assuring cache directory existence: %@", error);
		return nil;

	};

	NSURL *fileURL = [[NSURL fileURLWithPath:[preferredCacheDirectoryPath stringByAppendingPathComponent:IRWebAPIKitNonce()]] retain];
	return fileURL;

}


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

	NSError *error;

	if (![[NSFileManager defaultManager] removeItemAtURL:inTemporaryFileURL error:&error]) {

		NSLog(@"Error removing file at URL %@: %@", inTemporaryFileURL, error);
		return NO;

	} else {

		NSLog(@"Removed %@", inTemporaryFileURL);

	}

	return YES;

}


+ (IRWebAPIResponseContextTransformer) defaultCleanUpTemporaryFilesResponseTransformer {

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

		NSArray *cachedFileURLs = [[inResponseContext objectForKey:kIRWebAPIEngineResponseContextOriginalRequestContext] objectForKey:kIRWebAPIEngineRequestContextLocalCachingTemporaryFileURLsKey];

	//	DISPATCH_QUEUE_PRIORITY_BACKGROUND is unrecognized by LLVM 2.0 so we’re using the number it uses
		dispatch_async(dispatch_get_global_queue(-2, 0), ^ {

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

		});

		return inParsedResponse;

	}) copy] autorelease];

}

@end