Class: Cosmos::Screen::Widgets

Inherits:
Object
  • Object
show all
Defined in:
lib/cosmos/tools/tlm_viewer/screen.rb

Constant Summary collapse

@@closing_all =

Flag to indicate all screens should close

false

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(screen, mode) ⇒ Widgets

Returns a new instance of Widgets.



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 36

def initialize(screen, mode)
  @screen = screen
  # The telemetry viewer mode. Must be :REALTIME or basically anything else?
  @mode = mode
  # Hash of only the named widgets identifed by the NAMED_WIDGET keyword
  @named = {}
  # Array of all widgets which take a value
  @item = []
  # Array of all widgets which do NOT take a value
  @non_item = []
  # Array of all the invalid items detected while parsing the config file
  @invalid = []
  # Array of all the items used by the item_widgets
  @items = []
  # Array of all the value types associated with the items
  @value_types = []
  # Latest limits set returned by the value update thread
  @limits_set = :DEFAULT
  # Current limits set which is compared against the one returned by the
  # value update thread
  @current_limits_set = :DEFAULT
  # Whether the value update thread is alive and running
  @alive = true
  # Values returned from the value update thread which are used to
  # update all the item_widgets
  @values = nil
  # Limits states returned from the value update thread which are used to
  # update all the item_widgets
  @limits_states = nil
  # Mutex used to synchronize the value update thread and updating the GUI
  @mutex = Mutex.new
  # Polling period of the value update thread
  @polling_period = nil
  # The value update thread instance
  @value_thread = nil
  # Used to gracefully break out of the value thread
  @value_sleeper = Sleeper.new
end

Instance Attribute Details

#invalid ⇒ Object

Returns the value of attribute invalid.



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 30

def invalid
  @invalid
end

#item ⇒ Object

Returns the value of attribute item.



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 30

def item
  @item
end

#items ⇒ Object

Returns the value of attribute items.



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 30

def items
  @items
end

#mode ⇒ Object

Returns the value of attribute mode.



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 30

def mode
  @mode
end

#named ⇒ Object

Returns the value of attribute named.



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 30

def named
  @named
end

#non_item ⇒ Object

Returns the value of attribute non_item.



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 30

def non_item
  @non_item
end

#polling_period ⇒ Object

Returns the value of attribute polling_period.



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 30

def polling_period
  @polling_period
end

#value_types ⇒ Object

Returns the value of attribute value_types.



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 30

def value_types
  @value_types
end

Class Method Details

.closing_all=(value) ⇒ Object 



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 32

def self.closing_all= (value)
  @@closing_all = value
end

Instance Method Details

#add_widget(klass, parameters, widget, widget_name, substitute, original_target_name, force_substitute) ⇒ Object 



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 85

def add_widget(klass, parameters, widget, widget_name, substitute, original_target_name, force_substitute)
  # Add to item or non_item widgets
  if klass.takes_value?
    if substitute and (original_target_name == parameters[0].upcase or force_substitute)
      @items << [substitute, parameters[1], parameters[2]]
    else
      @items << [parameters[0], parameters[1], parameters[2]]
    end
    @value_types << widget.value_type
    @item << widget
  else
    @non_item << widget
  end

  # Add to named widgets if necessary
  @named[widget_name] = widget if widget_name
end

#graceful_kill ⇒ Object 



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 197

def graceful_kill
  @value_sleeper.cancel
end

#process_settings ⇒ Object 



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 79

def process_settings
  widgets().each do |widget|
    widget.process_settings
  end
end

#shutdown ⇒ Object 



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 187

def shutdown
  @alive = false
  Cosmos.kill_thread(self, @value_thread)

  # Shutdown All Widgets
  widgets().each do |widget|
    widget.shutdown()
  end
end

#start_updates ⇒ Object 



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 112

def start_updates
  @value_thread = Thread.new do
    begin
      while(true)
        break if @@closing_all
        time = Time.now

        begin
          # Gather item values for value widgets
          if @mode == :REALTIME
            values, limits_states, limits_settings, limits_set = get_tlm_values(@items, @value_types)
            index = 0
            @items.each do |target_name, packet_name, item_name|
              begin
                System.limits.set(target_name, packet_name, item_name, limits_settings[index][0], limits_settings[index][1], limits_settings[index][2], limits_settings[index][3], limits_settings[index][4], limits_settings[index][5], limits_set) if limits_settings[index]
              rescue
                # This can fail if we missed setting the DEFAULT limits set earlier - Oh well
              end
              index += 1
            end
          end
          @mutex.synchronize do
            @values = values
            @limits_states = limits_states
            @limits_set = limits_set
          end
        rescue DRb::DRbConnError
          break if @@closing_all
          break if @value_sleeper.sleep(1)
          next
        end

        Qt.execute_in_main_thread {update_gui()} if @alive and (@mode == :REALTIME)
        delta = Time.now - time
        break if @@closing_all
        if @polling_period - delta > 0
          break if @value_sleeper.sleep(@polling_period - delta)
        else
          break if @value_sleeper.sleep(0.1) # Minimum delay
        end
      end
    rescue Exception => error
      @alive = false
      Qt.execute_in_main_thread(true) {|| ExceptionDialog.new(@screen, error, "Screen - Value Update Thread", false)}
      Thread.exit
    end
  end
end

#update_gui ⇒ Object 



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 161

def update_gui
  begin
    if @alive
      # Handle change in limits set
      update_limits_set()

      # Update widgets with values and limits_states
      @mutex.synchronize do
        (0..(@values.length - 1)).each do |index|
          @item[index].limits_state = @limits_states[index]
          @item[index].value = @values[index]
        end
      end

      # Update non_item widgets
      @non_item.each do |widget|
        widget.update_widget
      end
    end
  rescue Exception => error
    @alive = false
    Qt.execute_in_main_thread(true) {|| ExceptionDialog.new(@screen, error, "Screen - update_gui", false)}
    Thread.exit
  end
end

#update_limits_set ⇒ Object 



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 103

def update_limits_set
  if @limits_set != @current_limits_set
    @current_limits_set = @limits_set
    @item.each do |widget|
      widget.limits_set = @current_limits_set
    end
  end
end

#widgets ⇒ Object 



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# File 'lib/cosmos/tools/tlm_viewer/screen.rb', line 75

def widgets
  @item + @non_item
end