1 | //
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2 | // RNBranchAgingDictionary.m
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3 | // RNBranch
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4 | //
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5 | // Created by Jimmy Dee on 3/8/17.
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6 | // Copyright © 2017 Branch Metrics. All rights reserved.
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7 | //
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8 |
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9 | #import "RNBranchAgingDictionary.h"
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10 | #import "RNBranchAgingItem.h"
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11 |
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12 | @interface RNBranchAgingDictionary()
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13 | @property (nonatomic) NSMutableDictionary *dictionary;
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14 | @end
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15 |
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16 | @implementation RNBranchAgingDictionary
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17 |
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18 | #pragma mark - Object lifecycle
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19 |
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20 | + (instancetype)dictionaryWithTtl:(NSTimeInterval)ttl
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21 | {
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22 | return [[self alloc] initWithTtl:ttl];
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23 | }
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24 |
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25 | - (instancetype)initWithTtl:(NSTimeInterval)ttl
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26 | {
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27 | self = [super init];
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28 | if (self) {
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29 | _ttl = ttl;
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30 | _dictionary = [NSMutableDictionary dictionary];
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31 | }
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32 | return self;
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33 | }
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34 |
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35 | - (instancetype)init
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36 | {
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37 | @throw nil;
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38 | }
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39 |
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40 | #pragma mark - Methods from NSMutableDictionary
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41 |
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42 | - (void)setObject:(id)anObject forKey:(id<NSCopying>)aKey
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43 | {
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44 | [self insertItem:anObject forKey:aKey];
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45 | }
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46 |
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47 | - (void)setObject:(id)obj forKeyedSubscript:(id<NSCopying>)key
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48 | {
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49 | [self insertItem:obj forKey:key];
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50 | }
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51 |
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52 | - (id)objectForKey:(id)aKey
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53 | {
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54 | return [self itemForKey:aKey];
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55 | }
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56 |
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57 | - (id)objectForKeyedSubscript:(id)key
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58 | {
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59 | return [self itemForKey:key];
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60 | }
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61 |
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62 | - (void)removeObjectForKey:(id)key
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63 | {
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64 | [self.dictionary removeObjectForKey:key];
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65 | }
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66 |
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67 | #pragma mark - Internal utilities
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68 |
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69 | - (void)insertItem:(id)obj forKey:(id<NSCopying>)key
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70 | {
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71 | [self ageItems];
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72 |
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73 | self.dictionary[key] = [[RNBranchAgingItem alloc] initWithItem:obj];
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74 | }
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75 |
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76 | - (id)itemForKey:(id)key
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77 | {
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78 | RNBranchAgingItem *item = self.dictionary[key];
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79 | return item.item;
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80 | }
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81 |
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82 | - (void)ageItems
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83 | {
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84 | NSTimeInterval now = [NSDate date].timeIntervalSince1970;
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85 |
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86 | NSArray<NSString *> *keys = self.dictionary.allKeys; // copy of allKeys
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87 |
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88 | for (NSString *key in keys) {
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89 | RNBranchAgingItem *item = self.dictionary[key];
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90 | if ((now - item.accessTime) >= self.ttl) {
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91 | [self.dictionary removeObjectForKey:key];
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92 | }
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93 | }
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94 | }
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95 |
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96 | @end
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