Class: FeatBit::InMemoryDataStore

Inherits:
Object
  • Object
show all
Defined in:
lib/featbit/data_store.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ InMemoryDataStore

Returns a new instance of InMemoryDataStore.



8
9
10
11
12
13
14
15
16
 
# File 'lib/featbit/data_store.rb', line 8

def initialize
  @flags = {}.freeze
  @segments = {}.freeze
  @flag_versions = {}.freeze
  @segment_versions = {}.freeze
  @version = 0
  @initialized = false
  @mutex = Mutex.new
end

Instance Method Details

#all_flags ⇒ Object 



44
45
46
47
48
49
50
51
 
# File 'lib/featbit/data_store.rb', line 44

def all_flags
  snapshot = @mutex.synchronize { @flags }
  snapshot.each_with_object({}) do |(key, value), result|
    result[key] = deep_dup(value) unless fetch(value, "isArchived", false)
  end
rescue StandardError
  {}
end

#flag(key) ⇒ Object 



30
31
32
33
34
35
 
# File 'lib/featbit/data_store.rb', line 30

def flag(key)
  item = @mutex.synchronize { @flags[key.to_s] }
  item && !fetch(item, "isArchived", false) ? deep_dup(item) : nil
rescue StandardError
  nil
end

#init(payload, version: nil) ⇒ Object 



53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
 
# File 'lib/featbit/data_store.rb', line 53

def init(payload, version: nil)
  data = normalize_payload(payload)
  flags = Array(fetch(data, "featureFlags", [])).to_h do |flag|
    [fetch(flag, "key").to_s, normalize_flag(flag)]
  end
  segments = Array(fetch(data, "segments", [])).to_h do |segment|
    [fetch(segment, "id").to_s, normalize_hash(segment)]
  end
  incoming_version = version || derive_version(flags.values + segments.values)
  incoming_version = 1 if incoming_version.to_i <= 0
  flag_versions = entity_versions(flags, version)
  segment_versions = entity_versions(segments, version)

  @mutex.synchronize do
    return false if @initialized && incoming_version.to_i <= @version

    @flags = deep_freeze(flags)
    @segments = deep_freeze(segments)
    @flag_versions = deep_freeze(flag_versions)
    @segment_versions = deep_freeze(segment_versions)
    @version = incoming_version.to_i
    @initialized = true
  end
  true
rescue StandardError
  false
end

#initialized? ⇒ Boolean

Returns:

  • (Boolean) 


18
19
20
21
22
 
# File 'lib/featbit/data_store.rb', line 18

def initialized?
  @mutex.synchronize { @initialized }
rescue StandardError
  false
end

#segment(id) ⇒ Object 



37
38
39
40
41
42
 
# File 'lib/featbit/data_store.rb', line 37

def segment(id)
  item = @mutex.synchronize { @segments[id.to_s] }
  item && !fetch(item, "isArchived", false) ? deep_dup(item) : nil
rescue StandardError
  nil
end

#upsert(kind, item, version: nil) ⇒ Object 



81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
 
# File 'lib/featbit/data_store.rb', line 81

def upsert(kind, item, version: nil)
  normalized = normalize_hash(item)
  key = kind.to_sym == :flags ? fetch(normalized, "key") : fetch(normalized, "id")
  return false if key.to_s.empty?

  incoming_version = version || item_version(normalized)
  incoming_version = @mutex.synchronize { @version + 1 } if incoming_version.to_i <= 0
  @mutex.synchronize do
    if kind.to_sym == :flags
      return false if incoming_version.to_i <= @flag_versions.fetch(key.to_s, 0)

      copy = @flags.dup
      version_copy = @flag_versions.dup
      copy[key.to_s] = normalize_flag(normalized)
      version_copy[key.to_s] = incoming_version.to_i
      @flags = deep_freeze(copy)
      @flag_versions = deep_freeze(version_copy)
    else
      return false if incoming_version.to_i <= @segment_versions.fetch(key.to_s, 0)

      copy = @segments.dup
      version_copy = @segment_versions.dup
      copy[key.to_s] = normalized
      version_copy[key.to_s] = incoming_version.to_i
      @segments = deep_freeze(copy)
      @segment_versions = deep_freeze(version_copy)
    end
    @version = [@version, incoming_version.to_i].max
    @initialized = true
  end
  true
rescue StandardError
  false
end

#version ⇒ Object 



24
25
26
27
28
 
# File 'lib/featbit/data_store.rb', line 24

def version
  @mutex.synchronize { @version }
rescue StandardError
  0
end