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/*
 * Copyright (C) Gustav Karlsson
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of the License at
 *
 * 
http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.kagkarlsson.examples;

import com.github.kagkarlsson.examples.helpers.Example;
import com.github.kagkarlsson.scheduler.Scheduler;
import com.github.kagkarlsson.scheduler.task.helper.RecurringTask;
import com.github.kagkarlsson.scheduler.task.helper.Tasks;
import com.github.kagkarlsson.scheduler.task.schedule.FixedDelay;
import java.io.Serializable;
import java.time.Duration;
import javax.sql.DataSource;

public class TrackingProgressRecurringTaskMain extends Example {

  public static void main(String[] args) {
    new TrackingProgressRecurringTaskMain().runWithDatasource();
  }

  @Override
  public void run(DataSource dataSource) {
    final FixedDelay schedule = FixedDelay.ofSeconds(2);

    final RecurringTask statefulTask =
        Tasks.recurring("counting-task", schedule, Counter.class)
            .initialData(new Counter(0))
            .executeStateful(
                (taskInstance, executionContext) -> {
                  final Counter startingCounter = taskInstance.getData();
                  for (int i = 0; i < 10; i++) {
                    System.out.println("Counting " + (startingCounter.value + i));
                  }
                  return new Counter(
                      startingCounter.value
                          + 10); // new value to be persisted as task_data for the next run
                });

    final Scheduler scheduler =
        Scheduler.create(dataSource)
            .pollingInterval(Duration.ofSeconds(5))
            .startTasks(statefulTask)
            .registerShutdownHook()
            .build();

    scheduler.start();
  }

  private static final class Counter implements Serializable {
    private final int value;

    public Counter(int value) {
      this.value = value;
    }
  }
}