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MyCollector.m
b74400fb0436master

MyCollector.m
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			classdef MyCollector < MySingleton
			properties (Access = public, SetObservable = true)
			InstrProps = struct() % Properties of instruments
			end

			properties (GetAccess = public, SetAccess = private, ...
			SetObservable = true)

			% Structure accomodating instruments
			InstrList = struct()
			end

			properties (Access = private)
			Listeners = struct()
			end

			properties (Dependent = true)
			running_instruments
			end

			events
			NewDataWithHeaders
			end

			methods (Access = private)

			% Constructor of a singleton class must be private
			function this = MyCollector()
			end
			end

			methods (Access = public)
			function delete(this)
			cellfun(@(x) deleteListeners(this, x), ...
			this.running_instruments);
			end

			function addInstrument(this, name, Instrument, varargin)
			assert(isvarname(name), ['Instrument name must be a valid ' ...
			'MATLAB variable name.'])

			assert(~ismember(name, this.running_instruments), ...
			['Instrument ' name ' is already present in the ' ...
			'collector. Delete the existing instrument before ' ...
			'adding a new one with the same name.'])

			p = inputParser();

			% Optional - put the instrument in global workspace
			addParameter(p, 'make_global', true, @islogical);

			% Read the settings of this instrument when new data is
			% acquired
			addParameter(p, 'collect_header', true, @islogical);

			parse(p, varargin{:});

			this.InstrList.(name) = Instrument;

			% Configure instrument properties
			this.InstrProps.(name) = struct( ...
			'collect_header', p.Results.collect_header, ...
			'global_name', '', ...
			'Gui', []);

			if p.Results.make_global
			global_name = name;

			% Assign instrument handle to a variable in global
			% workspace for quick reference
			if isValidBaseVar(global_name)
			base_ws_vars = evalin('base', 'who');

			warning(['A valid variable named ''' global_name ...
			''' already exists in global workspace.'])

			% Generate a new name excluding all the variable names
			% existing in the base workspace
			global_name = matlab.lang.makeUniqueStrings( ...
			global_name, base_ws_vars);
			end

			% Put the instrument in global workspace
			assignin('base', global_name, Instrument);

			this.InstrProps.(name).global_name = global_name;
			end

			if this.InstrProps.(name).collect_header && ...
			~ismethod(Instrument, 'readSettings')

			% If the class does not have a header generation function,
			% it can still be added to the collector and transfer data
			% to Daq
			this.InstrProps.(name).collect_header = false;
			warning(['%s does not have a readSettings function, ',...
			'measurement headers will not be collected from ',...
			'this instrument.'],name)
			end

			% If the added instrument has a newdata event, we add a
			% listener for it.
			if ismember('NewData', events(this.InstrList.(name)))
			this.Listeners.(name).NewData = ...
			addlistener(this.InstrList.(name),'NewData',...
			@(~, EventData) acquireData(this, name, EventData));
			end

			%Cleans up if the instrument is closed
			this.Listeners.(name).Deletion = ...
			addlistener(this.InstrList.(name), ...
			'ObjectBeingDestroyed', ...
			@(~,~) instrumentDeletedCallback(this, name));
			end

			% Get existing instrument
			function Instr = getInstrument(this, name)
			assert(ismember(name, this.running_instruments), ...
			['Name does not correspond to any of the running ' ...
			'instruments.'])
			Instr = this.InstrList.(name);
			end

			% Store instrument GUI
			function addInstrumentGui(this, instr_name, Gui)
			assert(ismember(instr_name, this.running_instruments), ...
			'Name must correspond to one of the running instruments.')
			this.InstrProps.(instr_name).Gui = Gui;
			end

			% Get existing instrument GUI
			function Gui = getInstrumentGui(this, instr_name)
			assert(ismember(instr_name, this.running_instruments), ...
			'Name must correspond to one of the running instruments.')

			Gui = this.InstrProps.(instr_name).Gui;

			if ~(ismethod(Gui, 'isvalid') && isvalid(Gui))

			% Do not return invalid GUIs
			Gui = [];
			end
			end

			function acquireData(this, name, InstrEventData)
			src = InstrEventData.Source;

			% Check that event data object is MyNewDataEvent,
			% and fix otherwise
			if ~isa(InstrEventData,'MyNewDataEvent')
			InstrEventData = MyNewDataEvent();
			InstrEventData.new_header = true;
			InstrEventData.Trace = copy(src.Trace);
			end

			% Indicate the name of acquiring instrument
			InstrEventData.src_name = name;

			% Collect the headers if the flag is on and if the triggering
			% instrument does not request suppression of header collection
			if InstrEventData.new_header

			% Add field indicating the time when the trace was acquired
			TimeMdt = MyMetadata.time('title', 'AcquisitionTime');

			AcqInstrMdt = MyMetadata('title', 'AcquiringInstrument');
			addParam(AcqInstrMdt, 'Name', InstrEventData.src_name);

			% Make the full metadata
			Mdt = [AcqInstrMdt, TimeMdt, acquireHeaders(this)];

			%We copy the MeasHeaders to both copies of the trace - the
			%one that is with the source and the one that is forwarded
			%to Daq.
			InstrEventData.Trace.MeasHeaders = copy(Mdt);
			src.Trace.MeasHeaders = copy(Mdt);
			end

			triggerNewDataWithHeaders(this, InstrEventData);
			end

			% Collects headers for open instruments with the header flag on
			function Mdt = acquireHeaders(this)
			Mdt = MyMetadata.empty();

			for i=1:length(this.running_instruments)
			name = this.running_instruments{i};

			if this.InstrProps.(name).collect_header
			try
			TmpMdt = readSettings(this.InstrList.(name));
			TmpMdt.title = name;
			Mdt = [Mdt, TmpMdt]; %#ok<AGROW>
			catch ME
			warning(['Error while reading metadata from %s. '...
			'Measurement header collection is switched '...
			'off for this instrument.\nError: %s'], ...
			name, ME.message)
			this.InstrProps.(name).collect_header = false;
			end
			end
			end
			end

			function bool = isrunning(this, name)
			assert(ischar(name)&&isvector(name),...
			'Instrument name must be a character vector, not %s',...
			class(name));
			bool = ismember(name, this.running_instruments);
			end

			% Remove instrument from collector without deleting the instrument
			% object
			function removeInstrument(this, name)
			if isrunning(this, name)

			% Remove the instrument entries
			this.InstrList = rmfield(this.InstrList, name);
			this.InstrProps = rmfield(this.InstrProps, name);

			deleteListeners(this, name);
			end
			end
			end

			methods (Access = private)
			function instrumentDeletedCallback(this, name)

			% Clear the base workspace wariable
			gn = this.InstrProps.(name).global_name;
			if ~isempty(gn)
			try
			evalin('base', sprintf('clear(''%s'');', gn));
			catch ME
			warning(['Could not clear global variable ''' ...
			gn '''. Error: ' ME.message]);
			end
			end

			% Remove the instrument entry from Collector
			removeInstrument(this, name);
			end
			end

			methods(Static = true)

			% Singletone constructor.
			function this = instance()
			persistent UniqueInstance

			if isempty(UniqueInstance)\|\|(~isvalid(UniqueInstance))
			disp('Creating a new instance of MyCollector')
			this = MyCollector();
			UniqueInstance = this;
			else
			this = UniqueInstance;
			end
			end
			end

			methods (Access = private)
			function triggerNewDataWithHeaders(this, InstrEventData)
			notify(this, 'NewDataWithHeaders', InstrEventData);
			end

			%deleteListeners is in a separate file
			deleteListeners(this, obj_name);
			end

			methods
			function val = get.running_instruments(this)
			val = fieldnames(this.InstrList);
			end
			end
			end

rINSTCONTROL/@MyCollector/MyCollector.mb74400fb0436master

MyCollector.mView Options

rINSTCONTROL/@MyCollector/MyCollector.m
b74400fb0436master

MyCollector.m
View Options