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README.md

ORIS Tool: Sirio Library Examples

A ready-to-use project for the Sirio API

This repository provides a ready-to-use Maven project that you can easily import into an Eclipse workspace to start working with the Sirio API within minutes.

Just follow these steps:

  1. Install Java 9. For Windows and macOS, you can download a package from Oracle; on Debian unstable (sid) or testing (buster), or Ubuntu "bionic", you can just run apt-get install openjdk-9-jdk.

  2. Download Eclipse. The Eclipse IDE for Java Developers package is sufficient.

  3. Clone this project. Inside Eclipse:

    • Select File > Import > Maven > Check out Maven Projects from SCM and click Next.
    • If the SCM URL dropbox is grayed out, click on m2e Marketplace and install m2e-egit. You will have to restart Eclipse (be patient...).
    • As SCM URL, type: https://github.com/oris-tool/sirio-examples.git and click Next and then Finish.

Your Eclipse project is ready! Just navigate to src/main/java and open ProducerConsumer.java inside the package org.oristool.examples. You will find the following example:

public class ProducerConsumer {
  public static void main(String[] args) {
    PetriNet pn = new PetriNet();

    // first produce-consume loop
    Place producing1 = pn.addPlace("producing1");
    Transition produce1 = pn.addTransition("produce1");
    Place buffer1 = pn.addPlace("buffer1");
    Transition consume1 = pn.addTransition("consume1");

    pn.addPrecondition(producing1, produce1);
    pn.addPostcondition(produce1, buffer1);
    pn.addPrecondition(buffer1, consume1);
    pn.addPostcondition(consume1, producing1);

    // second produce-consume loop
    Place producing2 = pn.addPlace("producing2");
    Transition produce2 = pn.addTransition("produce2");
    Place buffer2 = pn.addPlace("buffer2");
    Transition consume2 = pn.addTransition("consume2");

    pn.addPrecondition(producing2, produce2);
    pn.addPostcondition(produce2, buffer2);
    pn.addPrecondition(buffer2, consume2);
    pn.addPostcondition(consume2, producing2);

    // consume1 has priority over consume2
    pn.addInhibitorArc(buffer1, consume2);

    // durations are all uniform over [1,2]
    produce1.addFeature(StochasticTransitionFeature.newUniformInstance("1", "2"));
    produce2.addFeature(StochasticTransitionFeature.newUniformInstance("1", "2"));
    consume1.addFeature(StochasticTransitionFeature.newUniformInstance("1", "2"));
    consume2.addFeature(StochasticTransitionFeature.newUniformInstance("1", "2"));

    // initial state
    Marking m = new Marking();
    m.addTokens(producing1, 1);
    m.addTokens(producing2, 1);

    // transient until time=12, error 0.005 (per epoch), integration step=0.02
    RegTransient analysis = RegTransient.builder()
        .greedyPolicy(new BigDecimal("12"), new BigDecimal("0.005"))
        .timeStep(new BigDecimal("0.02"))
        .build();

    TransientSolution<DeterministicEnablingState, Marking> solution =
        analysis.compute(pn, m);

    // display transient probabilities
    new TransientSolutionViewer(solution);
  }
}

This code models the following stochastic time Petri net (STPN):

By clicking on the menu Run > Run as > Java Application you can start the analysis. You will see the following plot of transient probabilities:

Analysis Results

For a detailed introduction, check the Sirio Wiki. The Sirio Javadoc is also available.

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