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Examples on how to use db-scheduler with Spring Boot
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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.boot.config;

import com.github.kagkarlsson.examples.boot.ExampleContext;
import com.github.kagkarlsson.scheduler.task.ExecutionContext;
import com.github.kagkarlsson.scheduler.task.Task;
import com.github.kagkarlsson.scheduler.task.TaskDescriptor;
import com.github.kagkarlsson.scheduler.task.TaskInstance;
import com.github.kagkarlsson.scheduler.task.helper.ScheduleAndData;
import com.github.kagkarlsson.scheduler.task.helper.Tasks;
import com.github.kagkarlsson.scheduler.task.schedule.CronSchedule;
import java.io.Serializable;
import java.util.Random;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import utils.EventLogger;

@Configuration
public class MultiInstanceRecurringConfiguration {

  public static final TaskDescriptor MULTI_INSTANCE_RECURRING_TASK =
      TaskDescriptor.of("multi-instance-recurring-task", ScheduleAndCustomer.class);

  /** Start the example */
  public static void start(ExampleContext ctx) {
    CronSchedule cron = new CronSchedule(String.format("%s * * * * *", new Random().nextInt(59)));
    Customer customer = new Customer(String.valueOf(new Random().nextInt(10000)));
    ScheduleAndCustomer data = new ScheduleAndCustomer(cron, customer);

    ctx.log(
        "Scheduling instance of recurring task "
            + MULTI_INSTANCE_RECURRING_TASK.getTaskName()
            + " with data: "
            + data);

    ctx.schedulerClient.scheduleIfNotExists(
        MULTI_INSTANCE_RECURRING_TASK.instance(customer.id).data(data).scheduledAccordingToData());
  }

  /** Bean definition */
  @Bean
  public Task multiInstanceRecurring() {
    // This task will only start running when at least one instance of the task has been scheduled
    return Tasks.recurringWithPersistentSchedule(MULTI_INSTANCE_RECURRING_TASK)
        .execute(
            (TaskInstance taskInstance, ExecutionContext executionContext) -> {
              ScheduleAndCustomer data = taskInstance.getData();
              EventLogger.logTask(
                  MULTI_INSTANCE_RECURRING_TASK,
                  String.format(
                      "Ran according to schedule '%s' for customer %s",
                      data.getSchedule(), data.getData()));
            });
  }

  public static class ScheduleAndCustomer implements ScheduleAndData {
    private static final long serialVersionUID = 1L; // recommended when using Java serialization
    private final CronSchedule schedule;
    private final Customer customer;

    private ScheduleAndCustomer() {
      this(null, null);
    } //

    public ScheduleAndCustomer(CronSchedule schedule, Customer customer) {
      this.schedule = schedule;
      this.customer = customer;
    }

    @Override
    public CronSchedule getSchedule() {
      return schedule;
    }

    @Override
    public Customer getData() {
      return customer;
    }

    @Override
    public String toString() {
      return "ScheduleAndCustomer{" + "schedule=" + schedule + ", customer=" + customer + '}';
    }
  }

  public static class Customer implements Serializable {
    private static final long serialVersionUID = 1L; // recommended when using Java serialization
    public final String id;

    private Customer() {
      this(null);
    }

    public Customer(String id) {
      this.id = id;
    }

    @Override
    public String toString() {
      return "Customer{" + "id='" + id + '\'' + '}';
    }
  }
}