Class: Observation

Inherits:
Object
  • Object
show all
Defined in:
lib/MINT-core/mapping/observation/observation.rb

Direct Known Subclasses

NegationObservation

Instance Method Summary collapse

Constructor Details

#initialize(parameters) ⇒ Observation

Returns a new instance of Observation.



3
4
5
6
7
8
9
10
11
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 3

def initialize(parameters)
  @observation = parameters

  # state of subscription, to ensure that an observation only subscribes once
  @cb_observation_has_subscribed = false

  # defines if the ongoing subscription should act or has been temporary disabled using stop
  @should_listen = false
end

Instance Method Details

#call_subscribed_callbacks ⇒ Object 



211
212
213
214
215
216
217
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 211

def call_subscribed_callbacks
  @subscribed_callbacks ||= []
  while cb = @subscribed_callbacks.pop
    cb.call(self)
  end
  @subscribed_callbacks.clear if @subscribed_callbacks
end

#check_true_at_startup(cb) ⇒ Object 



69
70
71
72
73
74
75
76
77
78
79
80
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
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 69

def check_true_at_startup(cb)
  # check if observation is already true at startup
  model = MINT::Interactor.class_from_channel_name(element)

  results = nil
  if (name)  # if a name is specified, query directly otherwise select by state and return the first one found
    results = []
    r =model.get(model.getModel,name)
    return false if r.nil? # handles the case that the named interactor does not exist!
    results << r
  else
    results = model.all
  end

  # if no states variable is set, there is no need to filter states
  if states and states.length >0  and results.length > 0
    r = results.find_all { |e|
      ((e.states.map(&:to_s) & states).length>0) or ((e.abstract_states.split('|') & states).length>0)
    }
  else
    r = results
  end

  if r.length > 0
    if r.length ==1
      cb.call element, true, result(MultiJson.decode r[0].to_json(:only => r[0].class::PUBLISH_ATTRIBUTES)),id
    else
      res = []
      r.each do |e|
        res << MultiJson.decode(e.to_json(:only => e.class::PUBLISH_ATTRIBUTES))
      end

      cb.call element, true, result(res),id
    end

    return true
  else
    return false
  end

end

#element ⇒ Object 



30
31
32
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 30

def element
  @observation[:element]
end

#fail(cb) ⇒ Object 



118
119
120
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 118

def fail(cb)
  cb.call element, :fail , nil, id
end

#id ⇒ Object 



26
27
28
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 26

def id
  @observation[:id]
end

#is_continuous? ⇒ Boolean

Returns:

  • (Boolean) 


13
14
15
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 13

def is_continuous?
  @observation[:process].nil? or @observation[:process] == :continuous
end

#is_instant? ⇒ Boolean

Returns:

  • (Boolean) 


17
18
19
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 17

def is_instant?
  @observation[:process] == :instant
end

#is_onchange? ⇒ Boolean

Returns:

  • (Boolean) 


21
22
23
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 21

def is_onchange?
  @observation[:process] == :onchange
end

#is_subscribed_callback(&block) ⇒ Object

This callback is used to inform that the observation has been successfully subscribed



200
201
202
203
204
205
206
207
208
209
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 200

def is_subscribed_callback(&block)
  return unless block

  if @cb_observation_has_subscribed
    block.call(self)
  else
    @subscribed_callbacks ||= []
    @subscribed_callbacks.unshift block # << block
  end
end

#name ⇒ Object 



50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 50

def name
  if @observation[:name] =~ /\./ # check if refers to variable used in sync mappings
    selector = @observation[:name].split "."
    variable = selector.shift
    attributes = selector
    if (@observation_results and @observation_results.has_key? variable)
      interactor_data= @observation_results[variable]
      interactor = MINT::Interactor.get(interactor_data["mint_model"],interactor_data["name"])

      attributes.each do |attr|
        interactor = interactor.method(attr).call
      end
      return interactor
    end
  else
    return @observation[:name]
  end
end

#result(r) ⇒ Object 



42
43
44
45
46
47
48
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 42

def result(r)
  if resultName and r
    {resultName => r }
  else
    {}
  end
end

#resultName ⇒ Object 



38
39
40
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 38

def resultName
  @observation[:result]
end

#start(observations_results, cb) ⇒ Object 



122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 122

def start(observations_results,cb)
  @observation_results=observations_results

  if @cb_observation_has_subscribed # restart!!
    @should_listen = true

    if is_instant?
      fail(cb)  if not check_true_at_startup(cb)
    elsif is_continuous?
      check_true_at_startup(cb)
    end
    return self
  end

  @proc_observation_wo_name = Proc.new { |key, message|
    if @should_listen
      found=MultiJson.decode message
      if name.nil? or name.eql? found["name"]
        if found.has_key? "new_states"
          if (found["new_states"] & states).length>0 # checks if both arrays share at least one element
            cb.call element, true , result(found),id
          else
            if (found["states"] & states).length == 0
              cb.call element, false, {},id
            end
          end
        end
      end
    end
  }

  @proc_observation = Proc.new { |message|
        if @should_listen
          found=MultiJson.decode message
            if found.has_key? "new_states"
              if (found["new_states"] & states).length>0 # checks if both arrays share at least one element
                cb.call element, true , result(found),id
              else
                if (found["states"] & states).length == 0
                  cb.call element, false, {},id
                end
              end
            end
        end
      }

  res = false

  res = check_true_at_startup(cb) if is_continuous? or is_instant?

  if not res and is_instant? # instant checks do not require a subscribe and directly fail if false
    fail(cb)
    return self
  end

  if not    @cb_observation_has_subscribed
    @should_listen = true
    redis = RedisConnector.redis

    if (name)
      redis.pubsub.subscribe("#{element}.#{name}",@proc_observation).callback { |count|
        @cb_observation_has_subscribed = true
        call_subscribed_callbacks
      }
    else
      redis.pubsub.psubscribe("#{element}*",@proc_observation_wo_name).callback { |count|
        @cb_observation_has_subscribed = true
        call_subscribed_callbacks
      }
    end

  end
  self
end

#states ⇒ Object 



34
35
36
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 34

def states
  @observation[:states].map &:to_s
end

#stop ⇒ Object 



111
112
113
114
115
116
 
# File 'lib/MINT-core/mapping/observation/observation.rb', line 111

def stop
  #   RedisConnector.redis.pubsub.unsubscribe_proc("#{element}",@proc_observation)
  @should_listen = false
  #@cb_observation_has_subscribed = false
  @subscribed_callbacks = []
end