Reference: Simware Technical Library Date: May-2017 Version : 1 © SIMWARE SOLUTIONS S.L., 2017. All rights reserved. Technical Resources [ Understanding Simware Platform ]
Reference: Simware Technical Library
Date: May-2017
Version : 1
© SIMWARE SOLUTIONS S.L., 2017. All rights reserved.
Technical Resources [ Understanding Simware Platform ]
SIMWARE Technical Resources
Understanding Simware architecture Date: May 2017
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1 OBJECTIVE
This document describes the main features and capabilities in Simware
platform and some use cases for the platform.
2 INTRO TO SIMWARE PLATFORM
Simware platform is based on a microservices architecture, named Layered
Simulation Architecture or LSA. LSA is the first microservices architecture for
simulation, specifically designed to support the development of real time and
Net-Centric simulation products. As any other microservices architecture, LSA
allows to decompose the simulation product into small and easily manageable
components. Microservices are called Entities in Simware and interoperate with
other entities by exchanging data through a distributed simulation runtime
infrastructure, that is working as the ESB (Enterprise Service Bus) of the simulation
product.
Simware platform provides a loosely coupled architecture, composed by multiple
layers that can work alone or in collaboration, depending on the project’s
requirements. Simware layers provided everything you need to develop real
time simulations that can be connected with web and legacy applications in
any kind of simulation & training solution.
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3 SIMWARE DESIGN’S PATTERN
Simware platform evolves the traditional design pattern of a real time
simulation, based on the structural model pattern or AVSM, first introduced in
the simulation domain by SEI in 19931, to support Net-Centric and data-centric
open simulations.
Simware architecture supports a design pattern with three levels of artefacts:
- The executive level, applications and services that handle coordination
issues: real-time scheduling of subsystems, synchronization between
applications, event management, data sharing, and data integrity.
- The application level, handling the computation of the simulation. Its
functions are implemented by Entities and simulation services that are
composed by simulation models.
- The interface level, handling the integration of third-party components.
External applications can be integrated in Simware platform by using the
1 Technical Report CMU/SEI-93-TR-14. Structural Modeling: An application framework and development process for flight simulators
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open APIs provided in Simware or by using a standard interface as HLA,
DIS, DDS, CIGI, etc.
Integration of all the artefacts at the different level is achieved by the use of a
real time middleware, that provides a publish-subscribe interface to the two
data models in Simware, one for the management of the simulation and the
other for the exchange of simulation data.
Simware provides 4 main artefacts at the Executive level:
- Scheduler. It is doing the functions of the AVSM’s timeline synchronizer. It
keeps the state of the simulation, manage the tick of the clock and
controls the operational status of the Entities. It also commands the
creation and destruction of new instances of the simulation objects,
under the request of the ACS or of any external application.
- A XML configuration file, which defines the simulator structure (number of
hosts and Entities running in each host), simulation conditions (master sim
frequency, number of hosts, conditions for the cyclical execution of the
entities and services, initial conditions, etc.)
- A control data-model, which defines the management object model for
the simulation (state machine, clock, management of instances of the
objects, etc.)
- SimEngine, it is the periodic sequencer in Simware platform. One
instance of the SimEngine is running in each host in which periodic
simulations are executed. SimEngine manages the cyclical execution of
the periodic simulations using the simulation conditions defined in the
configuration file (order, frequency, etc.) and the state and time control
data provided by the scheduler.
Event handler functions are performed in Simware by the simulation
middleware. It is the middleware which process the publications of interactions
(the way to model events in Simware) to the subscribers connected to the
network. Delivery conditions to the subscribers will be specified in the specific
QoS contract for each subscriber.
At the Application level, Simware supports Simulation models that can be
integrated in Entities (subsystems) or can be deployed as Simulation Services.
Entities can be connected to Simulation Services through the middleware.
Entities and Sim services exchange data as is defined in the simulation data
model: simulation objects (permanent data) and interactions (events).
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Interactions are used in Simware to send orders/request between the Entities
and Sim services2.
Entities and Simulation services can be asynchronous components, event-
based applications that don’t need from a SimEngine or synchronized
components working under the command of a SimEngine.
Simware platform provides also the foundation of an IOS: the ACS application.
ACS is a container of control panels created automatically directly from the
simulation data-model and provides a visual interface to manage the
execution of the simulation and the management of instances of the simulation
objects and interactions.
At the Interface Level, Simware provides open APIs and tools to create control
and simulation data interfaces with third-party applications. Simware provides
C++ and Web APIs to integrate other desktop and web applications and tools
and SDKs to develop gateways with systems that are using different standard
protocols as HLA, DIS, JAUS, CIGI, DDS, etc3 Gateway SDK can be also be used
to develop gateways with proprietary protocols. This capability enables the
easy integration of components provided by other partners in the supply chain
of the simulator, including COTS components.
One or several Entities and simulation services can be integrated together as a
Component, that would be a kind of micro-service. This services can be
deployed on dedicated simulation servers, that can connected to several
simulation sessions at the same time (know further at section 5)
2 Learn more about how Simware leverages the interactions to provide interoperability at a component level in the technical paper
“Doing smart connected simulations” at http://www.simware.es/resources.html
3 To learn more about the standards and protocols supported in Simware goes to http://www.simware.es/simware--
standards.html
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4 SIMWARE’S LAYERED ARCHITECTURE
Simware’s bedrock is his data-centric, layered and modular architecture. All
the artefacts explained in above section are organized in separate layers. Our
layered architecture provides a great modularity and flexibility of use.
Simware is composed by next layers:
- Data-exchange layer. Right now, Simware is compliant with DDS and
HLA. Different implementations of both standards can be used to
exchange data in the network between the different applications in
Simware and even with others external to Simware. This is one of the
main features included in Simware: any source-code developed with
Simware can be deployed on HLA or DDS without any change, only by
changing a parameter in the construction of the simulation session.
- Simulation Data-Bus. Simware provides a pure data-centric simulation
middleware to connect different applications. This middleware includes
APIs to manage the data-models used in Simware.
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- Runtime Infrastructure. This layer contains the main artefacts at the
Executive level and its use is optional4 in Simware. You will only need it in
case you are dealing with synchronized simulations using a common
wall-clock or need to deal with the cyclical and deterministic
execution of physics-based simulations. This layer can be used then to
build the host of a real time simulator or to manage the real time
execution of different simulation services running on a simulation server.
Simware, as a pure distributed architecture, allows the distribution of
the cyclical computation of physics based simulation models in
different machines, synchronized by a shared wall-clock and a
common state machine. Two services are provided in the runtime
infrastructure to manage this distributed simulation: Scheduler and
SimEngines. Scheduler manages the clock and command the transition
between the different states of the simulation. A SimEngine is an artifact
running in each machine that it is executing physics-based sim models.
This SimEngine manage the cyclical execution of the sim model based
on the tick of the clock and the state of the simulation.
- SimWeb Server. This optional layer opens Simware data-centric
architecture to web and mobile applications. It leverages LTI standard
(Learning Tool Interoperability) to provide an interface between the
typical client-server architecture in web and mobile apps and the
data-centric architecture in Simware.
- Gateway. This optional layer provides the capability to connect the
basic classes for the publishers and listeners in Simware with systems that
use standard based or proprietary connectivity protocols. This layer then
provides a bridge between the internal data-models in Simware and
heterogeneous systems, that can be both simulations or real systems.
4.1 SIMWARE = DATA-CENTRIC
The main difference in Simware when you compare with any other COTS in the
market it is its pure data-centric architecture. Simware only leverages data to
enable the interactions between all the entities connected to the platform.
Data is used to exchange information about the dynamics and behaviors of
the different simulated objects, including the interactions between them.
4 This layer can be also used to integrate third-party simulation engines and legacy simulation models. See “SIMWARE_RESOURCES :
Integrating legacy sim models” to know how to do it”.
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Simware also use data to manage the execution of the simulation in a
distributed environment (control of the state-machine and the clock,
management of instances of the different objects, etc.).
Data-models in Simware are based on HLA standard. Simware uses the HLA
Object Model Template spec as the base to design its own data-models. You
will find two data-models in any Simware simulation:
- Simulation data-model. It can be any data-model. Simulation data-
models in Simware are composed by persistent entities (simulation
objects) and events (interactions in HLA terminology). Data-models are
built with Modeler tool included in Simware Core package. Modeler will
build automatically an instance of the middleware in Simware (called
NCWare Sim) from the HLA-style XML file.
- Control Data-Model. It is a fixed data-model, used to manage the
simulation (its state-machine, the simulation’s wall clock and the
management of the simulation objects).
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Data-centric middleware maintains the state of the simulation using the control
data model. It manages the simulated content using simulation objects and
interactions with the same structure as specified in HLA standard.
Interactions in Simware are used not only to declare events in the simulation
but also to call the methods and procedures of other entities. For example, a
fighter entity can use interactions to command external simulation services to
launch flares, missiles or bombs. In this way, interactions enable dynamic
interoperability between the simulation entities as it is defined by LCIM (Levels
of Conceptual Interoperability Model)5
During execution of a session with Simware, a simulation data-domain will be
created in the network, to publish and subscribe the objects and interactions
in the Simulation data-Model and to exchange management information
about the state of the simulation using the control data-model.
Simware allows to have several simulations running at the same time in only
one physical network. Different “logical” simulation domains will be managed
for each one of the simulation executions. A Simware simulation domain is the
equivalent of a federation execution in HLA ((know further at section 5)
In each simulation session, you will have several applications that are publishing
and subscribing to any number of objects and interactions. In HLA terminology,
you will call each of them a federate. In Simware we call them Simulation
Entities or Services.
5 Know further at “SIMWARE_RESOURCES : Doing Smart Connected Simulations”
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4.2 SIMWARE = NET-CENTRIC
Our fully distributed architecture is another key feature in Simware. Simware is
the only commercial real time simulation platform in the market fully leveraging
the best advantages of distributed systems. This feature allows to develop Net-
Centric simulators, ready to be deployed in the network and be connected to
other systems there.
Net-Centric architecture, besides to make easier the connectivity with other
systems in the network, enables the distributed computing of the simulation
system. This feature is very important even in the case of a standalone
simulator: standalone simulators used to be deployed on several computers,
Simware allows then to distribute the Entities in the different computers without
any limitation. A very typical example of how to use this capability is to balance
the load of the host of a real-time simulator between different computers.
Simware allows to distribute the artefacts in the Executive and application
levels in any machine of the network of the simulator.
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4.3 SIMWARE = OPEN APIS
Each main layer in Simware has their own API to develop and configure the
services and features included in it:
• NCWare Sim. It is a C++ based API available on Simware Core license
for Windows and Linux. It is the API that is used with the simulation data-
bus to interface with the simulation data-model. With this API, the
developer can:
1. create/destroy simulations sessions or join to one already existing
2. Manage publishers and subscribers for the objects and interactions
in the Simulation data-model.
3. Manage synchronization points that can be used to synchronize
different entities in a Simware simulation.
4. Manage a logger and system traces for code depuration. These
traces can be stored in a file to do a deeper review of the execution
of the simulation.
• Simware Control Library (SCL). It is another C++ API, also provided with
Simware Core, for Linux and Windows. This library provides a set of
classes to get access to the Simware Control datamodel. This includes
methods to manage the simulation state machine, to control the
creation and destruction of instances of the objects and interactions
included in the simulation data-model and to define the initial
condition for the exercises. SCL is then managing the execution of the
artifacts included in Runtime Infrastructure layer (Scheduler and
SimEngine).
• Simware Web API. SimWeb Server provides a RESTful API, compliant with
the LTI std, to connect web and mobile applications to the control and
simulation data-models in Simware. SimWeb Server is generated
automatically from the data-models using the Web generator included
in Simware Web extension. A simplified C++ API is provided with this
extension in order to build LTI based applications that can connect to
the simulation and control data-models in Simware. A LtiClient C++
class is provided with the Simware Web package that helps the C++
developer to create and manage LTI messages. Clients can also be
done in other languages as Java, Python, C#, etc.
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• eHost API. It is an XML based API that allows the configuration of the
execution of the runtime infrastructure and its deployment in the
network. The XML File allows to configure all the parameters that are
required to run a real-time simulation in the network as the overall
simulation frequency, the simulation frequency and execution order for
the sim models, the physical deployment of each sim model in the
network, etc. Basically, eHost, SCL API and the ACS tool (included also
in Simware Core package) allows to configure and manage the
execution of a simulation session as shown in the picture
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5 SIMWARE’S DEPLOYMENT ARCHITECTURE
In execution, Simware is deployed as any micro-services architecture, with a
simulation infrastructure deployed on top of the network. Basic parameters of
the execution (distribution of the Simulation Entities, overall frequency of the
simulation, etc.) are defined in the eHost Config file. Specific mechanism to
exchange data in the network will be declared in the construction of the
middleware (DDS or HLA).
Several sessions of the simulation can be running at the same time on the same
network. Simware supports the concept of Domains, that it is a logical scope
(or "address space") for the data-models definitions. Simulation Domains are
completely independent from each other. For two Simware Entities to
communicate with each other they must join the same simulation Domain. This
feature enables the deployment of simulation servers, that are machines that
can execute several simulation sessions of the Entities at the same time, each
one serving a different simulation domain.
Specific service level agreements between the publishers & subscribers and the
middleware will be defined in a QoS file. Middleware will create messaging
channels in each domain between the publishers and subscribers of each type
of data contained in the control and simulation data models. These channels
will be based on shared memory in the case of flows of data between entities
running on the same machine or UDP based messaging in the case of entities
running on different machines.
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One Scheduler service will be running on one machine of the simulation
network. Command of the simulation can be made through ACS console
provided with the software or by any application using the SCL API to connect
to the control data model.
Periodic simulations will run under the control of a SimEngine. One SimEngine
service will be running in each machine that it is running periodic simulations,
as physic-based simulation models.
Event based Entities can be also running in the simulation infrastructure. This kind
of aperiodic applications can use the synchronization services provided by the
Scheduler Service (common state-machine, common wall-clock) or run
asynchronously only coordinated by specific interactions defined in the
simulation data-model. For example, an interaction can be a Request_LOS that
is processed by an aperiodic Terrain simulation service. Any Entity requesting a
Line of Sight service will publish the interaction and the simulation service will
publish the LOS for the provided location.
Other entities can be connected to the middleware to consume or publish
data. This Entities can be integrated in Simware infrastructure through the C++
and Web APIs or by using a gateway.
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6 AGILE DEVELOPMENT WITH SIMWARE PLATFORM
Simware innovations are not only in the software architecture. Simware
platform has been also designed as a productivity platform6, looking for the
rapid design and development of the simulator.
Simware provides an integrated development environment that supports many
of the best agile&lean software practices as model driven development, test-
driven development and continuous integration/delivery. The uncoupled and
data-centric architecture in Simware allows to develop the simulator in an
incremental way, having flexibility to add or change requirements during the
development process7.
Simware provides visual tools that
allows to generate rapidly the
structure of the simulator directly
from the simulation data-model
that can deployed directly on the
network using HLA or DDS.
Simware Designer tools, included
in Simware Core license,
generate, directly from the data-
model, C++ and XML file
describing the publish-subscribe interface of all the Entities and simulation
services. Simware tools create also directly the instantiation of the integration
infrastructure based on the designed simulation data-model, including the
publish-subscribe interfaces to the middleware, the Web server to connect LTI
based web/mobile applications and the Logger server to record the exercises.
All these artefacts are generated automatically, direct from the data-model.
Designer tools generates C++, LTI and XML interfaces. XML interfaces define in
HLA format the publish-subscribe interface of each subsystem/component. This
XML file, or Interface Definition File, IDF, in Simware terms, is used by
SimDeveloper tool, an extension to the Core in our portfolio, to do model-driven
development of the subsystems/components in the simulation. SimDeveloper
6 Go to http://www.simware.es/products.html to learn more about the commercial packages in Simware portfolio
7 Go to http://www.simware.es/agile-simware.html to learn more about how to adopt Agility with Simware platform
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is an integrated simulation development environment into Simulink, that allows
to develop, integrate and test the simulations models using Mathworks
products: Simulink, Matlab and StateFlow. Once the simulation modules have
been verified into Simulink environment, automatic generation of C++ code is
provided as a feature in Simdeveloper. SimDeveloper is also very useful in the
case of the development of hi-fi training devices that are using the engineering
data-package of the vehicle and its main systems. In this case, the
manufacturer and its OEMs can provide the data-package as Simulink libraries,
that could be used in SimDeveloper as input to develop the simulation models
for the simulator.
Simware Web extension provides a Web server generator to create
automatically the web interface of the simulator directly from the data-model.
This web server provides a translation to LTI messages of the data-models in
Simware.
Simware Record&Play extension has also the capability to create a Recorder
server directly from the data-model. Simware Recorder Generator generates
automatically a Logger server from the simulation data model.
Simware LVC extension provides PowerLink tool to generate automatically
gateways to DIS and HLA simulators and a Gateway SDK to speed up the
development of interfaces to any other standard or proprietary protocol.
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7 EXAMPLES OF USING SIMWARE ARCHITECTURE
In this chapter, you will find several examples of how Simware is used to build
and integrate different types of applications. These are only some examples of
how the different layers in Simware can be combined together to build a
simulation.
7.1 VISUALIZATION APPLICATION.
In the case of a 2D or 3D app, they will
normally only would need to connect
to the simulation Data-model in
Simware. In this case, the developer
will use a software architecture as
shown in the picture
7.2 CONTROL STATION
In the case of a control station, as an
Instructor Operated Station (IOS), the
developer will need also to have
access to the control data-model in
Simware, in order to be able to
manage the execution of the
simulation session.
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7.3 REAL TIME SIMULATION HOST
In the case of developing a simulation engine that it is managing the distributed
execution of different simulation models (working or not synchronized by a
common wall clock), the developer would need to add the runtime
infrastructure to its development.
In this case the basic software
architecture would be as in the
picture. This architecture is useful
to build many real time simulations
as for example:
- The Host of a real time
simulator
- A Simulation Server
- A Computer Generated
Forces Engine.
7.4 INTEGRATION OF WEB/MOBILE
APPLICATIONS
In case that you need to connect web
or mobile apps with your Simware
simulation you would need to add a
SimWeb server to your deployment, in
order to provide the interface
between the LTI’s Send & Request
messages and the data-centric
architecture in Simware.
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7.5 HLA SIMULATION SERVER CONTROLLED BY A WEB’S BASED IOS
You can combine above architectures to build more complex examples. For
instance you could deploy a real time simulation server in the network, as a HLA
federate, providing weapon simulation services to the federation of
simulations. This simulation server could be managed into a DMOC (Distributed
Mission Operation Center) using a web based IOS.
7.6 REAL TIME SERVER PROVIDING SIMULATION SERVICES TO HLA NETWORK
As an advanced case of the former example you could have a HLA federate
providing simulation services from a farm of servers. In this case to support the
distributed computation of the simulation services in several servers, DDS will be
used in order to take advantage of the best performance versus HLA. This DDS
server would need in this case a gateway to be connected to the main HLA
network. From a development point of view, main difference in this example
when comparing the simulation server with the one in former example is that in
this case the integration engineer will modify the eHost config file in order to
change the deployment of the simulation services to more than one node (it
will create more than a SimEngine) and will deploy the NCWare middleware
on DDS instead of HLA. Simulation services will be the same as in the other
example.
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7.7 REAL TIME SIMULATOR WITH MOTION PLATFORM
In another complex integration, the real time components in a training device,
for example the simulation host and the motion platform, could leverage the
distributed architecture in Simware and the deterministic exchange of data
available with DDS to work integrated as in the example. This architecture will
leverage the QoS in DDS to guarantee deterministic performance in the
exchange of data between the physic-based sim models allocated in the host
and the motion platform.
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7.8 FLIGHT SIMULATOR8
Simware can be used as the backbone to build high-fidelity virtual simulators,
as a flight simulator. In this case, DDS based simulation data-bus can be used
as the backbone of the simulator, using the open APIs in Simware to integrate
desktop based and web-based components, developed in-house, by third-
party partners or COTS.
8 To know more about how to use Simware for virtual training, download the technical Resource Developing Training Devices with
Simware at http://www.simware.es/resources.html or visit our page http://www.simware.es/training-devices.html
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7.9 LVC SIMULATION
Complex LVC simulations, involving multiple architectures and protocols, can
be also be implemented and deployed with Simware. In this case, full
capabilities of Simware will be unleashed, integrating native and legacy
applications in multi-architecture simulation environments in which the
seamless interoperability of HLA, DDS, DIS, Web and other standards will be
managed by the multiple layers in Simware9.
One example is shown in next picture. This picture shows the high level
architecture of a real use case for Simware, the CITIUS Lab. This is an example
of a multi-architecture solution that leverage the data-centric architecture in
Simware and its connectivity capabilities to integrate real and simulated
systems in a common virtual environment. In this case heterogeneous systems
are connected to a common simulation environment using different interfaces
as DDS, HLA, DIS, JAUS or MSDL/CBML.
9 To know more about how to use Simware for LVC simulation go to technical Resource Doing LVC Simulation with Simware at
http://www.simware.es/resources.html
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8 SUMMARY
This technical document is only showing some of the multiple choices the
developer has when is developing with Simware. Loosely coupled architecture
in Simware allows to combine the different layers in many ways. Modularity
allows only to use the requested layers in each integration, avoiding any
unnecessary overhead and minimizing the impact of the platform in the
performance of the whole product.
You can find more information about the platform and her architecture, the
APIs and the tools, and how to use them in the documents and examples that
are provided with the installation of the different Simware packages. Our web-
site (simware.es) also includes more technical resources as this one that can
help you to master Simware platform quickly. You can also contact our sales
team at [email protected] to know how the specific requirements in your
project could be solved using Simware.
9 ABOUT SIMWARE SOLUTIONS
Simware Solutions is leading the introduction of Open platforms into the
Simulation & Training markets. Our platform, Simware, leverages the new
Layered Simulation Architecture or LSA to fulfill the requirements of the lead
users of the industry, which are demanding open architectures, better
interoperability and increasing economical returns for their investments in
simulation and training solutions.
Our platform is the first commercial product in the market supporting the
Internet of Simulations concept. IoS is about to embrace technologies as
internet, distributed systems, open platforms, cloud computing and service
oriented architectures for the development and deployment of open, net-
centric and interoperable simulations.
Simware is the only simulation platform in the market supporting Net-Centric
simulation without restrictions, enabling new business models for simulation as
the use of simulation as a Service (MSaaS) or the use of simulation platforms as
a service (SPaaS).
Simware is the only simulation platform in the market that is useful in all the
phases of the simulation based system engineering of industrial and consumer
products.