agbexpiringcache's Introduction

AGBExpiringCache

An Objective-C memory cache that invalidates items after a certain time interval.

The implementation uses NSCache, so the cache may also be invalidated on system memory pressure.

###Usage

Create an AGBExpiringCache and optionally set its expiryTimeInterval. The default is 3600 (1 hour).
Make your model objects conform to the AGBExpiringCacheItem protocol by adding this property:

@property (nonatomic, strong) NSDate *expiringCacheItemDate;
Store objects when you get them, and retrieve them when you want them!

###Sample Code

#import "AGBExpiringCache.h"

@property (nonatomic, strong) AGBExpiringCache *accountsCache;

- (void) doSomething {
    if (!self.accountsCache) {
        self.accountsCache = [[AGBExpiringCache alloc] init];
        self.accountsCache.expiryTimeInterval = 7200; // 2 hours
    }

    // add an object to the cache
    [self.accountsCache setObject:newObj forKey:@"some key"];

    // get an object
    SomeModelObject *cachedObj = [self.accountsCache objectForKey:@"some key"];
    if (!cachedObj) {
        // create a new one, either the old one expired or we've never gotten it
    }
}

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