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entry

Class: matlab.DiscreteEventSystem
Namespace: matlab

Event action when entity enters storage element

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Syntax

[entity,events]=entry(obj,storage,entity,source)
[entity,events,out1,...]=entry(obj,storage,entity,source,in1,...)

Description

[entity,events]=entry(obj,storage,entity,source) specifies event actions of the object when an entity enters storage.

[entity,events,out1,...]=entry(obj,storage,entity,source,in1,...) such event actions of the object when the block has one or more input signal ports and/or signal output ports.

Input Arguments

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Discrete-event System object.

Index of the storage element.

Entity entering storage component. Entity has these fields:

  • sys (MATLAB structure) — It has these fields:

    • id (double) — Entity ID

    • priority (double) — Entity priority

  • data — Entity data

Source location of entity, such as an input port or a storage element. It has these fields:

  • type (character vector) — Specify input or storage

  • index (double) — Input or storage index

Any data inputs of the object. These input arguments exist only when the object has data inputs.

Output Arguments

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Entity entering storage, possibly with changed data. See entity.

Events to be scheduled. Use matlab.DiscreteEventSystem class methods to create events. Each event has these fields:

  • type (character vector) — Type of the event

  • delay (double) — Delay before the event

  • priority (double) — Priority of the event

  • Storage (double) — Index of the storage element

  • tag (character vector) — Event tag

  • location (MATLAB structure) — Source or destination location of entity, see source

Data outputs of the object. You must specify these output arguments when the object has data outputs.

Examples

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Event action for entity entry to storage.

function [entity,events] = entry(obj,storage,entity,src)
    % Specify event actions when entity entered storage.
    disp(['Entity of ID ' num2str(entity.sys.id) ...
          ' has entered storage element ' num2str(storage)]);
    switch src.type
        case 'input'
            disp(['Entity came from input port ' num2str(src.index)]);
        case 'storage'
            disp(['Entity came from storage element ' num2str(src.index)]);
    end
    events = [ ...
        obj.eventDestroy(), ...    % Destroy the newly entered entity
        obj.eventIterate(2, '')];  % Iterate entities in storage element 2
end

This example shows how to use discrete-event System object methods to create a custom entity storage block that has one input port, one output port, and one storage element. The discrete-event System object is the instantiation of the matlab.DiscreteEventSystem class, which allows you to use the implementation and service methods provided by this class. Then, you use the MATLAB Discrete-Event System block to integrate the System object into a SimEvents® model.

The custom MATLAB Discrete-Event System block accepts an entity from its input port and forwards it to its output port with a specified delay. For more information, see Delay Entities with a Custom Entity Storage Block.

classdef CustomEntityStorageBlock < matlab.DiscreteEventSystem
                        
    % A custom entity storage block with one input, one output, and one storage. 
 
    % Nontunable properties 
    properties (Nontunable)
    % Capacity
        Capacity = 1;
    % Delay
        Delay=4;
    end
    
    methods (Access=protected)        
        function num = getNumInputsImpl(~)
            num = 1;
        end
        
        function num = getNumOutputsImpl(~)
            num = 1;
        end      
        
        function entityTypes = getEntityTypesImpl(obj)
            entityTypes = obj.entityType('Car');
        end
        
        function [inputTypes,outputTypes] = getEntityPortsImpl(obj)
            inputTypes = {'Car'};
            outputTypes = {'Car'};
        end

        function [storageSpecs, I, O] = getEntityStorageImpl(obj)
            storageSpecs = obj.queueFIFO('Car', obj.Capacity);
            I = 1;
            O = 1;
        end
       
    end
    
   methods
       
        function [entity,event] = CarEntry(obj,storage,entity,source)
            % Specify event actions when entity enters storage.
        
             event = obj.eventForward('output', 1, obj.Delay);
           
        end
     
    end
    
end

Version History

Introduced in R2016a

See Also

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