1   /* Copyright 2002-2024 CS GROUP
2    * Licensed to CS GROUP (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.orekit.estimation.measurements.generation;
18  
19  import org.orekit.estimation.measurements.ObservedMeasurement;
20  import org.orekit.time.AbsoluteDate;
21  import org.orekit.time.DatesSelector;
22  
23  
24  /** {@link Scheduler} generating measurements sequences continuously.
25   * <p>
26   * Continuous schedulers continuously generate measurements following a repetitive pattern.
27   * The repetitive pattern can be either a continuous stream of measurements separated by
28   * a constant step (for example one measurement every 60s), or several sequences of measurements
29   * at high rate up to a maximum number, with a rest period between sequences (for example
30   * sequences of up to 256 measurements every 100ms with 300s between each sequence).
31   * </p>
32   * @param <T> the type of the measurement
33   * @author Luc Maisonobe
34   * @since 9.3
35   */
36  public class ContinuousScheduler<T extends ObservedMeasurement<T>> extends AbstractScheduler<T> {
37  
38      /** Simple constructor.
39       * <p>
40       * BEWARE! Dates selectors often store internally the last selected dates, so they are not
41       * reusable across several {@link EventBasedScheduler instances}. A separate selector
42       * should be used for each scheduler.
43       * </p>
44       * @param builder builder for individual measurements
45       * @param selector selector for dates (beware that selectors are generally not
46       * reusable across several {@link EventBasedScheduler instances}, each selector should
47       * be dedicated to one scheduler
48       */
49      public ContinuousScheduler(final MeasurementBuilder<T> builder, final DatesSelector selector) {
50          super(builder, selector);
51      }
52  
53      /** {@inheritDoc} */
54      @Override
55      public boolean measurementIsFeasible(final AbsoluteDate date) {
56          return true;
57      }
58  
59  
60  }