Examples of StepHandler

org.apache.commons.math.ode.sampling.StepHandler
This interface represents a handler that should be called after each successful step.
The ODE integrators compute the evolution of the state vector at some grid points that depend on their own internal algorithm. Once they have found a new grid point (possibly after having computed several evaluation of the derivative at intermediate points), they provide it to objects implementing this interface. These objects typically either ignore the intermediate steps and wait for the last one, store the points in an ephemeris, or forward them to specialized processing or output methods.
@see org.apache.commons.math.ode.FirstOrderIntegrator @see org.apache.commons.math.ode.SecondOrderIntegrator @see StepInterpolator @version $Revision: 1073158 $ $Date: 2011-02-21 22:46:52 +0100 (lun. 21 févr. 2011) $ @since 1.2
org.apache.commons.math3.ode.sampling.StepHandler
This interface represents a handler that should be called after each successful step.
The ODE integrators compute the evolution of the state vector at some grid points that depend on their own internal algorithm. Once they have found a new grid point (possibly after having computed several evaluation of the derivative at intermediate points), they provide it to objects implementing this interface. These objects typically either ignore the intermediate steps and wait for the last one, store the points in an ephemeris, or forward them to specialized processing or output methods.
@see org.apache.commons.math3.ode.FirstOrderIntegrator @see org.apache.commons.math3.ode.SecondOrderIntegrator @see StepInterpolator @since 1.2
org.springframework.batch.core.job.StepHandler
Strategy interface for handling a {@link Step} on behalf of a {@link Job}. @author Dave Syer

Examples of org.apache.commons.math3.ode.sampling.StepHandler

  @Test
  public void testStepSize()
    {
      final double step = 1.23456;
      FirstOrderIntegrator integ = new ClassicalRungeKuttaIntegrator(step);
      integ.addStepHandler(new StepHandler() {
          public void handleStep(StepInterpolator interpolator, boolean isLast) {
              if (! isLast) {
                  Assert.assertEquals(step,
                               interpolator.getCurrentTime() - interpolator.getPreviousTime(),
                               1.0e-12);

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Examples of org.apache.commons.math3.ode.sampling.StepHandler

    double scalAbsoluteTolerance = 1.0e-8;
    double scalRelativeTolerance = scalAbsoluteTolerance;
    DormandPrince853Integrator integ = new DormandPrince853Integrator(minStep, maxStep,
                                                                      scalAbsoluteTolerance,
                                                                      scalRelativeTolerance);
    integ.addStepHandler(new StepHandler() {
        public void handleStep(StepInterpolator interpolator, boolean isLast) {
            StepInterpolator cloned = interpolator.copy();
            double tA = cloned.getPreviousTime();
            double tB = cloned.getCurrentTime();
            double halfStep = FastMath.abs(tB - tA) / 2;

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Examples of org.apache.commons.math3.ode.sampling.StepHandler

  @Test
  public void testStepSize()
    {
      final double step = 1.23456;
      FirstOrderIntegrator integ = new GillIntegrator(step);
      integ.addStepHandler(new StepHandler() {
          public void handleStep(StepInterpolator interpolator, boolean isLast) {
              if (! isLast) {
                  Assert.assertEquals(step,
                               interpolator.getCurrentTime() - interpolator.getPreviousTime(),
                               1.0e-12);

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Examples of org.apache.commons.math3.ode.sampling.StepHandler

  @Test
  public void testStepSize()
    {
      final double step = 1.23456;
      FirstOrderIntegrator integ = new ThreeEighthesIntegrator(step);
      integ.addStepHandler(new StepHandler() {
          public void handleStep(StepInterpolator interpolator, boolean isLast) {
              if (! isLast) {
                  Assert.assertEquals(step,
                               interpolator.getCurrentTime() - interpolator.getPreviousTime(),
                               1.0e-12);

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Examples of org.apache.commons.math3.ode.sampling.StepHandler

      double scalAbsoluteTolerance = 1.0e-8;
      double scalRelativeTolerance = scalAbsoluteTolerance;
      DormandPrince54Integrator integ = new DormandPrince54Integrator(minStep, maxStep,
                                                                      scalAbsoluteTolerance,
                                                                      scalRelativeTolerance);
      integ.addStepHandler(new StepHandler() {
          public void handleStep(StepInterpolator interpolator, boolean isLast) {
              StepInterpolator cloned = interpolator.copy();
              double tA = cloned.getPreviousTime();
              double tB = cloned.getCurrentTime();
              double halfStep = FastMath.abs(tB - tA) / 2;

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Examples of org.apache.commons.math3.ode.sampling.StepHandler

  @Test
  public void testStepSize()
    {
      final double step = 1.23456;
      FirstOrderIntegrator integ = new EulerIntegrator(step);
      integ.addStepHandler(new StepHandler() {
        public void handleStep(StepInterpolator interpolator, boolean isLast) {
            if (! isLast) {
                Assert.assertEquals(step,
                             interpolator.getCurrentTime() - interpolator.getPreviousTime(),
                             1.0e-12);

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Examples of org.apache.commons.math3.ode.sampling.StepHandler

    double scalAbsoluteTolerance = 1.0e-8;
    double scalRelativeTolerance = scalAbsoluteTolerance;
    HighamHall54Integrator integ = new HighamHall54Integrator(minStep, maxStep,
                                                              scalAbsoluteTolerance,
                                                              scalRelativeTolerance);
    integ.addStepHandler(new StepHandler() {
        public void handleStep(StepInterpolator interpolator, boolean isLast) {
            StepInterpolator cloned = interpolator.copy();
            double tA = cloned.getPreviousTime();
            double tB = cloned.getCurrentTime();
            double halfStep = FastMath.abs(tB - tA) / 2;

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Examples of org.apache.commons.math3.ode.sampling.StepHandler

    double scalAbsoluteTolerance = 1.0e-8;
    double scalRelativeTolerance = scalAbsoluteTolerance;
    GraggBulirschStoerIntegrator integ = new GraggBulirschStoerIntegrator(minStep, maxStep,
                                                                          scalAbsoluteTolerance,
                                                                          scalRelativeTolerance);
    integ.addStepHandler(new StepHandler() {
        public void handleStep(StepInterpolator interpolator, boolean isLast) {
            StepInterpolator cloned = interpolator.copy();
            double tA = cloned.getPreviousTime();
            double tB = cloned.getCurrentTime();
            double halfStep = FastMath.abs(tB - tA) / 2;

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Examples of org.springframework.batch.core.job.StepHandler

   */
  @Override
  protected void doExecute(StepExecution stepExecution) throws Exception {
    try {
      stepExecution.getExecutionContext().put(STEP_TYPE_KEY, this.getClass().getName());
      StepHandler stepHandler = new SimpleStepHandler(getJobRepository(), stepExecution.getExecutionContext());
      FlowExecutor executor = new JobFlowExecutor(getJobRepository(), stepHandler, stepExecution.getJobExecution());
      executor.updateJobExecutionStatus(flow.start(executor).getStatus());
      stepExecution.upgradeStatus(executor.getJobExecution().getStatus());
      stepExecution.setExitStatus(executor.getJobExecution().getExitStatus());
    }

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