resourceAcquired

Class: matlab.DiscreteEventSystem
Namespace: matlab

Event action upon successful resource acquisition

Syntax

[entity,event,... out1,...] = resourceAcquired(obj,... storage,...entity,resources,tag,in1,...)


Description

[entity,event,... out1,...] = resourceAcquired(obj,... storage,...entity,resources,tag,in1,...) specifies event action for a discrete-event System object™ upon successful acquisition of a resource. Resource acquisition is successful only if all of the specified resources are acquired.

Input Arguments

obj — Discrete-event System object

MATLAB^® object

Discrete-event System object.

storage — Storage that the entity resides in

double

Index of the storage element.

entity — Entity that is acquiring the resources

MATLAB structure

Entity that acquires the resource. Entity has these fields:

• sys (MATLAB structure) consisting of:

  • id (double) — Entity ID

  • priority (double) — Entity priority

• data — Entity data

resources — Acquired resources

MATLAB structure

An array of structures that specifies the resources that have been acquired.

tag — Tag of the resource acquisition event

character vector

Tag of the currently executing resource acquisition event.

in1 — First data input

character vector

First data input.

Output Arguments

entity — Entity with changed value

MATLAB structure

Entity acquiring the resource.

event — Events to be scheduled

vector of MATLAB structures

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 (see source)

out1 — First data output

character vector

First data output.

Examples

Event Action on Resource Acquisition

Suppose that an entity acquires resources successfully with a scheduled eventAcquireResource and the tag of this event is MyResourceAcquireEvent. Then this acquisition invokes the resourceAcquired method to forward entities to the output.

function [entity,events] = entry(obj, storage, entity, source)
  % On entry, acquire one resource of type Resource1.
  resRequest = obj.resourceSpecification('Resource1', 1);
  events = obj.eventAcquireResource(resRequest, 'MyResourceAcquireEvent');       
end
        
function [entity,events] = resourceAcquired(obj, storage,...  
                            entity, resources, tag)
  % After resource acquisition, forward the entity to the output.                     
  events = obj.eventForward('output', storage, 0.0);
end

Custom Resource Acquirer

This example shows how to use resource management methods to create a custom entity storage block in which entities acquire resources from specified Resource Pool blocks.

Suppose that you manage a facility that produces parts from two different materials, material 1 and material 2, to fulfill orders. After a part is produced, it is evaluated for quality assurance.

Two testing methods for quality control are:

• Test 1 is used for parts that are produced from material 1.

• Test 2 is used for parts that are produced from material 2

After the production phase, parts are tagged based on their material to apply the correct test.

For more information, see Create a Custom Resource Acquirer Block.

classdef CustomBlockAcquireResources < matlab.DiscreteEventSystem
    % Custom resource acquire block example.
    
    methods(Access = protected)
        
        function num = getNumInputsImpl(obj)
            num = 1;
        end
        

        function num = getNumOutputsImpl(obj)
            num = 1;
        end

      
        function entityTypes = getEntityTypesImpl(obj)
            entityTypes(1) = obj.entityType('Part');
        end
        
        function [input, output] = getEntityPortsImpl(obj)
            input  = {'Part'};
            output = {'Part'};
        end
        
        function [storageSpec, I, O] = getEntityStorageImpl(obj)
            storageSpec(1) = obj.queueFIFO('Part', 1);
            I = 1;
            O = 1;
        end
        
        function resNames = getResourceNamesImpl(obj)
            % Define the names of the resources to be acquired.
            resNames = obj.resourceType('Part', {'Test1', 'Test2'}) ;
        end
       
    end
        
    methods
        
        function [entity,events] = entry(obj, storage, entity, source)
            % On entity entry, acquire a resource from the specified pool. 
            if entity.data.Test == 1
            % If the entity is produced from Material1, request Test1.    
            resReq = obj.resourceSpecification('Test1', 1);
            else
            % If the entity is produced from Material2, request Test2.     
            resReq = obj.resourceSpecification('Test2', 1);
            end
            % Acquire the resource from the corresponding pool.
            events = obj.eventAcquireResource(resReq, 'TestTag');
        end
        
        function [entity,events] = resourceAcquired(obj, storage,...  
                                   entity, resources, tag)
        % After the resource acquisition, forward the entity to the output.                    
            events = obj.eventForward('output', storage, 0.0);
        end
        
    end

end

Version History

Introduced in R2019a