97 lines
1.8 KiB
Mathematica
97 lines
1.8 KiB
Mathematica
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// RNBranchAgingDictionary.m
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// RNBranch
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//
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// Created by Jimmy Dee on 3/8/17.
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// Copyright © 2017 Branch Metrics. All rights reserved.
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//
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#import "RNBranchAgingDictionary.h"
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#import "RNBranchAgingItem.h"
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@interface RNBranchAgingDictionary()
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@property (nonatomic) NSMutableDictionary *dictionary;
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@end
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@implementation RNBranchAgingDictionary
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#pragma mark - Object lifecycle
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+ (instancetype)dictionaryWithTtl:(NSTimeInterval)ttl
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{
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return [[self alloc] initWithTtl:ttl];
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}
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- (instancetype)initWithTtl:(NSTimeInterval)ttl
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{
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self = [super init];
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if (self) {
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_ttl = ttl;
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_dictionary = [NSMutableDictionary dictionary];
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}
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return self;
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}
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- (instancetype)init
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{
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@throw nil;
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}
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#pragma mark - Methods from NSMutableDictionary
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- (void)setObject:(id)anObject forKey:(id<NSCopying>)aKey
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{
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[self insertItem:anObject forKey:aKey];
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}
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- (void)setObject:(id)obj forKeyedSubscript:(id<NSCopying>)key
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{
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[self insertItem:obj forKey:key];
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}
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- (id)objectForKey:(id)aKey
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{
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return [self itemForKey:aKey];
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}
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- (id)objectForKeyedSubscript:(id)key
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{
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return [self itemForKey:key];
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}
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- (void)removeObjectForKey:(id)key
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{
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[self.dictionary removeObjectForKey:key];
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}
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#pragma mark - Internal utilities
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- (void)insertItem:(id)obj forKey:(id<NSCopying>)key
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{
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[self ageItems];
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self.dictionary[key] = [[RNBranchAgingItem alloc] initWithItem:obj];
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}
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- (id)itemForKey:(id)key
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{
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RNBranchAgingItem *item = self.dictionary[key];
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return item.item;
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}
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- (void)ageItems
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{
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NSTimeInterval now = [NSDate date].timeIntervalSince1970;
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NSArray<NSString *> *keys = self.dictionary.allKeys; // copy of allKeys
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for (NSString *key in keys) {
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RNBranchAgingItem *item = self.dictionary[key];
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if ((now - item.accessTime) >= self.ttl) {
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[self.dictionary removeObjectForKey:key];
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}
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}
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}
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@end
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