systemcomposer.allocation.Allocation

Allocation between source element and target element

Since R2020b

Description

An Allocation object defines the allocation between the source element and the target element.

Related objects include:

• systemcomposer.allocation.AllocationScenario

• systemcomposer.allocation.AllocationSet

Creation

Create two allocations between four elements in the default scenario, Scenario 1, using the allocate function.

defaultScenario = allocSet.getScenario("Scenario 1");
defaultScenario.allocate(sourceElement1,sourceElement2);
defaultScenario.allocate(sourceElement3,sourceElement4);

Properties

Source — Source element

element object

Source element, specified as a systemcomposer.arch.Element object.

Target — Target element

element object

Target element, specified as a systemcomposer.arch.Element object.

Scenario — Allocation scenario

allocation scenario object

Allocation scenario, specified as a systemcomposer.allocation.AllocationScenario object.

UUID — Universal unique identifier

character vector

Universal unique identifier, specified as a character vector.

Example: '91d5de2c-b14c-4c76-a5d6-5dd0037c52df'

Data Types: char

Object Functions

applyStereotype	Apply stereotype to architecture model element
getStereotypes	Get stereotypes applied on element of architecture model
removeStereotype	Remove stereotype from model element
setProperty	Set property value corresponding to stereotype applied to element
getProperty	Get property value corresponding to stereotype applied to element
getPropertyValue	Get value of architecture property
getEvaluatedPropertyValue	Get evaluated value of property from element
getStereotypeProperties	Get stereotype property names on element
hasStereotype	Find if element has stereotype applied
hasProperty	Find if element has property
destroy	Remove model element

Examples

Allocate Architectures in Tire Pressure Monitoring System

Use allocations to analyze a tire pressure monitoring system.

Overview

In systems engineering, it is common to describe a system at different levels of abstraction. For example, you can describe a system in terms of its high-level functions. These functions may not have any behavior associated with them but most likely trace back to some operating requirements the system must fulfill. We refer to this layer (or architecture) as the functional architecture. In this example, an automobile tire pressure monitoring system is described in three different architectures:

1. Functional Architecture — Describes the system in terms of its high-level functions. The connections show dependencies between functions [1].

2. Logical Architecture — Describes the system in terms of its logical components and how data is exchanged between them. Additionally, this architecture specifies behaviors for model simulation [2].

3. Platform Architecture — Describes the physical hardware needed for the system at a high level [3].

Note: This example illustrates allocations in System Composer™ using a specific methodology. However, you can use other methodologies that fit your needs.

The allocation process is defined as linking these three architectures that fully describe the system. The linking captures the information about each architectural layer and makes it accessible to the others.

Use this command to open the project.

openProject("scExampleTirePressureMonitorSystem");

Open the FunctionalAllocation.mldatx file, which displays allocations from TPMS_FunctionalArchitecture to TPMS_LogicalArchitecture in the Allocation Editor. The elements of TPMS_FunctionalArchitecture are displayed in the first column. The elements of TPMS_LogicalArchitecture are displayed in the first row. The arrows indicate the allocations between model elements.

The arrows display allocated components in the model. You can observe allocations for each element in the model hierarchy.

The rest of the example shows how to use this allocation information to further analyze the model.

Functional to Logical Allocation and Coverage Analysis

This section shows how to perform coverage analysis to verify that all functions have been allocated. This process requires using the allocation information specified between the functional and logical architectures.

To start the analysis, load the allocation set.

allocSet = systemcomposer.allocation.load('FunctionalAllocation');
scenario = allocSet.Scenarios;

Verify that each function in the system is allocated.

import systemcomposer.query.*;
[~,allFunctions] = allocSet.SourceModel.find(HasStereotype(IsStereotypeDerivedFrom("TPMSProfile.Function")));
unAllocatedFunctions = [];
ImplementedAllocations = [];
for i = 1:numel(allFunctions)
    alloc = scenario.getAllocatedTo(allFunctions(i));
    if isempty(alloc)
        unAllocatedFunctions(end+1) = allFunctions(i);
    end
end

allCompsSource = allocSet.SourceModel.find(AnyComponent);
allCompsTarget = allocSet.TargetModel.find(AnyComponent);
for i = 1:numel(allCompsSource)
    for j = 1:numel(allCompsTarget)
        sourceComp = allocSet.SourceModel.lookup(Path=allCompsSource{i});
        targetComp = allocSet.TargetModel.lookup(Path=allCompsTarget{j});
        allocated = scenario.getAllocation(sourceComp,targetComp);
        if ~isempty(allocated)
            if allocated.getPropertyValue("TPMSProfile.FunctionalAllocation.IsImplemented")
                ImplementedAllocations(end+1) = strcat(sourceComp.Name," to ",targetComp.Name);
            end
        end
    end
end

if isempty(unAllocatedFunctions)
  fprintf('All functions are allocated');
else
  fprintf('%d Functions have not been allocated',numel(unAllocatedFunctions));
end

All functions are allocated

if isempty(ImplementedAllocations)
  fprintf('No allocations are implemented');
else
  fprintf('%d Allocations have been implemented',numel(ImplementedAllocations));
end

6 Allocations have been implemented

The result displays All functions are allocated to verify that all functions in the system are allocated and lists the allocations that have not been implemented.

Analyze Suppliers Providing Functions

This section shows how to identify which functions will be provided by which suppliers using the specified allocations. Since suppliers will be delivering these components to the system integrator, the supplier information is stored in the logical model.

suppliers = {'Supplier A','Supplier B','Supplier C','Supplier D'};
functionNames = arrayfun(@(x) x.Name, allFunctions,'UniformOutput',false);
numFunNames = length(allFunctions);
numSuppliers = length(suppliers);
allocTable = table('Size',[numFunNames,numSuppliers],'VariableTypes',...
  repmat("double",1,numSuppliers));
allocTable.Properties.VariableNames = suppliers;
allocTable.Properties.RowNames = functionNames;
for i = 1:numFunNames
  elem = scenario.getAllocatedTo(allFunctions(i));
  for j = 1:numel(elem)
      elemSupplier = getEvaluatedPropertyValue(elem(j),"TPMSProfile.LogicalComponent.Supplier");
      allocTable{i,strcmp(elemSupplier,suppliers)} = 1;
  end

end

The table shows which suppliers are responsible for the corresponding functions.

allocTable

allocTable=8×4 table
                                    Supplier A    Supplier B    Supplier C    Supplier D
                                    __________    __________    __________    __________

    Calculate if pressure is low        1             0             0             0     
    Measure temprature of tire          0             0             0             1     
    Report Tire Pressure Levels         1             0             0             0     
    Measure Tire Pressure               0             0             0             0     
    Measure pressure on tire            0             0             1             0     
    Report Low Tire Pressure            1             0             0             0     
    Calculate Tire Pressure             0             1             0             0     
    Measure rotations                   0             1             0             0     

Analyze Software Deployment Strategies

You can determine if the Engine Control Unit (ECU) has enough capacity to house all the software components. The software components are allocated to the cores themselves, but the ECU is the component that has the budget property.

Get the platform architecture.

platformArch = systemcomposer.loadModel('PlatformArchitecture');

Load the allocation.

softwareDeployment = systemcomposer.allocation.load('SoftwareDeployment');

frontECU = platformArch.lookup('Path','PlatformArchitecture/Front ECU');
rearECU = platformArch.lookup('Path','PlatformArchitecture/Rear ECU');

scenario1 = softwareDeployment.getScenario('Scenario 1');
scenario2 = softwareDeployment.getScenario('Scenario 2');
frontECU_availMemory = getEvaluatedPropertyValue(frontECU,"TPMSProfile.ECU.MemoryCapacity");
rearECU_availMemory = getEvaluatedPropertyValue(rearECU,"TPMSProfile.ECU.MemoryCapacity");

frontECU_memoryUsed1 = getUtilizedMemoryOnECU(frontECU,scenario1);
frontECU_isOverBudget1 = frontECU_memoryUsed1 > frontECU_availMemory;
rearECU_memoryUsed1 = getUtilizedMemoryOnECU(rearECU,scenario1);
rearECU_isOverBudget1 = rearECU_memoryUsed1 > rearECU_availMemory;

frontECU_memoryUsed2 = getUtilizedMemoryOnECU(frontECU,scenario2);
frontECU_isOverBudget2 = frontECU_memoryUsed2 > frontECU_availMemory;
rearECU_memoryUsed2 = getUtilizedMemoryOnECU(rearECU,scenario2);
rearECU_isOverBudget2 = rearECU_memoryUsed2 > rearECU_availMemory;

Build a table to showcase the results.

softwareDeploymentTable = table([frontECU_memoryUsed1;frontECU_availMemory;...
  frontECU_isOverBudget1;rearECU_memoryUsed1;rearECU_availMemory;rearECU_isOverBudget1],...
  [frontECU_memoryUsed2; frontECU_availMemory; frontECU_isOverBudget2;rearECU_memoryUsed2;...
  rearECU_availMemory; rearECU_isOverBudget2],...
  'VariableNames',{'Scenario 1','Scenario 2'},...
  'RowNames',{'Front ECUMemory Used (MB)','Front ECU Memory (MB)','Front ECU Overloaded',...
  'Rear ECU Memory Used (MB)','Rear ECU Memory (MB)','Rear ECU Overloaded'})

softwareDeploymentTable=6×2 table
                                 Scenario 1    Scenario 2
                                 __________    __________

    Front ECUMemory Used (MB)       110            90    
    Front ECU Memory (MB)           100           100    
    Front ECU Overloaded              1             0    
    Rear ECU Memory Used (MB)         0            20    
    Rear ECU Memory (MB)            100           100    
    Rear ECU Overloaded               0             0    

function memoryUsed = getUtilizedMemoryOnECU(ecu, scenario)

For each component in the ECU, accumulate the binary size required for each allocated software component.

coreNames = {'Core1','Core2','Core3','Core4'};
memoryUsed = 0;
for i = 1:numel(coreNames)
  core = ecu.Model.lookup('Path',[ecu.getQualifiedName '/' coreNames{i}]);
  allocatedSWComps = scenario.getAllocatedFrom(core);
  for j = 1:numel(allocatedSWComps)
      binarySize = getEvaluatedPropertyValue(allocatedSWComps(j),"TPMSProfile.SWComponent.BinarySize");
      memoryUsed = memoryUsed + binarySize;
  end
end
end

More About

Definitions

Term	Definition	Application	More Information
allocation	An allocation establishes a directed relationship from architectural elements — components, ports, and connectors — in one model to architectural elements in another model.	Resource-based allocation allows you to allocate functional architectural elements to logical architectural elements and logical architectural elements to physical architectural elements.	Create and Manage Allocations Interactively Create and Manage Allocations Programmatically
allocation scenario	An allocation scenario contains a set of allocations between a source and a target model.	Allocate between model elements in an allocation scenario. The default allocation scenario is called Scenario 1.	Systems Engineering Approach for SoC Applications
allocation set	An allocation set consists of one or more allocation scenarios that describe various allocations between a source and a target model.	Create an allocation set with allocation scenarios in the Allocation Editor. Allocation sets are saved as MLDATX files.	Establish Traceability Between Architectures and Requirements Allocate Architectures in Tire Pressure Monitoring System

Version History

Introduced in R2020b