Class: Appom::ElementCache::Cache

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/appom/element_cache.rb

Overview

Element caching to improve performance for frequently accessed elements

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Logging

level, level=, #log_debug, #log_element_action, #log_error, #log_info, #log_wait_end, #log_wait_start, #log_warn, #logger

Constructor Details

#initialize(max_size: 100, ttl: 300) ⇒ Cache 



14
15
16
17
18
19
20
 
# File 'lib/appom/element_cache.rb', line 14

def initialize(max_size: 100, ttl: 300)
  @cache = {}
  @access_times = {}
  @max_size = max_size
  @ttl = ttl # Time to live in seconds
  @stats = { hits: 0, misses: 0, evictions: 0, stores: 0, clears: 0, expirations: 0 }
end

Instance Attribute Details

#max_size ⇒ Object (readonly)

Returns the value of attribute max_size.



12
13
14
 
# File 'lib/appom/element_cache.rb', line 12

def max_size
  @max_size
end

#ttl ⇒ Object (readonly)

Returns the value of attribute ttl.



12
13
14
 
# File 'lib/appom/element_cache.rb', line 12

def ttl
  @ttl
end

Instance Method Details

#clear ⇒ Object

Clear all cached elements



113
114
115
116
117
118
 
# File 'lib/appom/element_cache.rb', line 113

def clear
  @cache.clear
  @access_times.clear
  @stats[:clears] += 1
  log_info('Element cache cleared')
end

#generate_key(*args) ⇒ Object 



158
159
160
161
162
163
164
165
166
167
168
169
170
 
# File 'lib/appom/element_cache.rb', line 158

def generate_key(*args)
  # Handle both old and new calling patterns
  find_args = if args.length == 1 && args[0].is_a?(Array)
                # Old pattern: generate_key([strategy, value])
                args[0]
              else
                # New pattern: generate_key(strategy, value)
                args
              end

  # Create consistent cache key from find arguments
  Digest::MD5.hexdigest(find_args.to_s)
end

#get(cache_key) ⇒ Object

Get element from cache by key



31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
 
# File 'lib/appom/element_cache.rb', line 31

def get(cache_key)
  unless @cache.key?(cache_key)
    @stats[:misses] += 1
    return nil
  end

  element, timestamp = @cache[cache_key]

  # Check TTL
  if Time.now - timestamp > @ttl
    @cache.delete(cache_key)
    @access_times.delete(cache_key)
    @stats[:expirations] ||= 0
    @stats[:expirations] += 1
    @stats[:misses] += 1
    return nil
  end

  # Check if element is still valid
  unless valid_element?(element)
    @cache.delete(cache_key)
    @access_times.delete(cache_key)
    @stats[:misses] += 1
    return nil
  end

  # Update access time and refresh TTL
  current_time = Time.now
  @cache[cache_key] = [element, current_time]
  @access_times[cache_key] = current_time
  @stats[:hits] += 1
  element
end

#get_or_find(*find_args) ⇒ Object

Get element from cache or find and cache it



83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
 
# File 'lib/appom/element_cache.rb', line 83

def get_or_find(*find_args)
  cache_key = generate_key(find_args)

  if (cached_element = get(cache_key))
    log_debug("Cache HIT for #{find_args.join(', ')}")
    return cached_element
  end

  @stats[:misses] += 1
  log_debug("Cache MISS for #{find_args.join(', ')}")

  # Find element and cache it
  element = yield if block_given?
  store_in_cache(cache_key, element) if element
  element
end

#hit?(cache_key) ⇒ Boolean

Check if key exists in cache



66
67
68
69
70
71
72
73
74
75
 
# File 'lib/appom/element_cache.rb', line 66

def hit?(cache_key)
  return false unless @cache.key?(cache_key)

  element, timestamp = @cache[cache_key]

  # Check TTL without updating stats
  return false if Time.now - timestamp > @ttl

  valid_element?(element)
end

#invalidate(*find_args) ⇒ Object

Invalidate specific element



101
102
103
104
105
106
107
108
109
110
 
# File 'lib/appom/element_cache.rb', line 101

def invalidate(*find_args) # rubocop:disable Naming/PredicateMethod
  cache_key = generate_key(find_args)
  if @cache.delete(cache_key)
    @access_times.delete(cache_key)
    log_debug("Invalidated cache for #{find_args.join(', ')}")
    true
  else
    false
  end
end

#reset ⇒ Object

Clear all cached elements and reset statistics



121
122
123
124
125
126
 
# File 'lib/appom/element_cache.rb', line 121

def reset
  @cache.clear
  @access_times.clear
  @stats = { hits: 0, misses: 0, evictions: 0, stores: 0, clears: 0, expirations: 0 }
  log_info('Element cache reset')
end

#size ⇒ Object

Get cache size



78
79
80
 
# File 'lib/appom/element_cache.rb', line 78

def size
  @cache.size
end

#statistics ⇒ Object

Get cache statistics



129
130
131
132
133
134
135
136
 
# File 'lib/appom/element_cache.rb', line 129

def statistics
  {
    size: @cache.size,
    max_size: @max_size,
    hit_rate: calculate_hit_rate,
    **@stats,
  }
end

#stats ⇒ Object

Alias for backward compatibility



139
140
141
 
# File 'lib/appom/element_cache.rb', line 139

def stats
  statistics
end

#store(strategy, value, element) ⇒ Object

Store element in cache with strategy and value



23
24
25
26
27
28
 
# File 'lib/appom/element_cache.rb', line 23

def store(strategy, value, element)
  cache_key = generate_key(strategy, value)
  store_in_cache(cache_key, element)
  @stats[:stores] += 1
  cache_key
end

#valid_element?(element) ⇒ Boolean

Check if element is still valid (exists and is stale)



144
145
146
147
148
149
150
151
152
153
154
155
156
 
# File 'lib/appom/element_cache.rb', line 144

def valid_element?(element)
  return false unless element
  return true unless element.respond_to?(:displayed?)

  begin
    # Try to access a property to check if element is stale
    element.displayed?
    true
  rescue StandardError
    # Element is stale or invalid
    false
  end
end