com.github.kagkarlsson.scheduler.task.helper.ScheduleOnceOnStartup Maven / Gradle / Ivy

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Simple persistent scheduler for scheduled tasks, recurring or ad-hoc.

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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.scheduler.task.helper;

import com.github.kagkarlsson.scheduler.Clock;
import com.github.kagkarlsson.scheduler.SchedulerClient;
import com.github.kagkarlsson.scheduler.task.Task;
import com.github.kagkarlsson.scheduler.task.TaskInstance;
import java.time.Instant;
import java.util.function.Function;

class ScheduleOnceOnStartup implements ScheduleOnStartup {
  private String instance;
  private T data;
  private Function firstExecutionTime;

  ScheduleOnceOnStartup(String instance) {
    this(instance, null);
  }

  ScheduleOnceOnStartup(String instance, T data) {
    this(instance, data, Function.identity());
  }

  ScheduleOnceOnStartup(String instance, T data, Function firstExecutionTime) {
    this.firstExecutionTime = firstExecutionTime;
    this.instance = instance;
    this.data = data;
  }

  public void apply(SchedulerClient scheduler, Clock clock, Task task) {
    scheduler.schedule(getSchedulableInstance(task), firstExecutionTime.apply(clock.now()));
  }

  private TaskInstance getSchedulableInstance(Task task) {
    if (data == null) {
      return task.instance(instance);
    } else {
      return task.instance(instance, data);
    }
  }
}