ContinuousScheduler.java

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 * (the "License"); you may not use this file except in compliance with
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 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.orekit.estimation.measurements.generation;

import org.orekit.estimation.measurements.EstimatedMeasurementBase;
import org.orekit.estimation.measurements.ObservedMeasurement;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.DatesSelector;

import java.util.function.Predicate;

/** {@link Scheduler} generating measurements sequences continuously.
 * <p>
 * Continuous schedulers continuously generate measurements following a repetitive pattern.
 * The repetitive pattern can be either a continuous stream of measurements separated by
 * a constant step (for example one measurement every 60s), or several sequences of measurements
 * at high rate up to a maximum number, with a rest period between sequences (for example
 * sequences of up to 256 measurements every 100ms with 300s between each sequence).
 * </p>
 * @param <T> the type of the measurement
 * @author Luc Maisonobe
 * @since 9.3
 */
public class ContinuousScheduler<T extends ObservedMeasurement<T>> extends AbstractScheduler<T> {

    /** Simple constructor.
     * <p>
     * BEWARE! Dates selectors often store internally the last selected dates, so they are not
     * reusable across several {@link EventBasedScheduler instances}. A separate selector
     * should be used for each scheduler.
     * </p>
     * <p>
     * This constructor calls {@link #ContinuousScheduler(MeasurementBuilder, DatesSelector, Predicate)}
     * whith the predicate set to accept all generated measurements.
     * </p>
     * @param builder builder for individual measurements
     * @param selector selector for dates (beware that selectors are generally not
     * reusable across several {@link EventBasedScheduler instances}, each selector should
     * be dedicated to one scheduler
     */
    public ContinuousScheduler(final MeasurementBuilder<T> builder, final DatesSelector selector) {
        super(builder, selector, e -> true);
    }

    /** Simple constructor.
     * <p>
     * BEWARE! Dates selectors often store internally the last selected dates, so they are not
     * reusable across several {@link EventBasedScheduler instances}. A separate selector
     * should be used for each scheduler.
     * </p>
     * @param builder builder for individual measurements
     * @param selector selector for dates (beware that selectors are generally not
     * reusable across several {@link EventBasedScheduler instances}, each selector should
     * be dedicated to one scheduler
     * @param filter predicate for a posteriori filtering of generated measurements
     *               (measurements are accepted if the predicates evaluates to {@code true})
     * @since 13.0
     */
    public ContinuousScheduler(final MeasurementBuilder<T> builder, final DatesSelector selector,
                               final Predicate<EstimatedMeasurementBase<T>> filter) {
        super(builder, selector, filter);
    }

    /** {@inheritDoc} */
    @Override
    public boolean measurementIsFeasible(final AbsoluteDate date) {
        return true;
    }


}