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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.stats;

import com.github.kagkarlsson.scheduler.task.ExecutionComplete;

public interface StatsRegistry {

  enum SchedulerStatsEvent {
    UNEXPECTED_ERROR,
    FAILED_HEARTBEAT,
    COMPLETIONHANDLER_ERROR,
    FAILUREHANDLER_ERROR,
    DEAD_EXECUTION,
    RAN_UPDATE_HEARTBEATS,
    RAN_DETECT_DEAD,
    RAN_EXECUTE_DUE,
    FAILED_MULTIPLE_HEARTBEATS,
    UNRESOLVED_TASK
  }

  enum CandidateStatsEvent {
    STALE,
    ALREADY_PICKED,
    EXECUTED
  }

  enum ExecutionStatsEvent {
    COMPLETED,
    FAILED
  }

  void register(SchedulerStatsEvent e);

  void register(CandidateStatsEvent e);

  void register(ExecutionStatsEvent e);

  void registerSingleCompletedExecution(ExecutionComplete completeEvent);

  StatsRegistry NOOP = new DefaultStatsRegistry();

  class DefaultStatsRegistry implements StatsRegistry {

    @Override
    public void register(SchedulerStatsEvent e) {}

    @Override
    public void register(CandidateStatsEvent e) {}

    @Override
    public void register(ExecutionStatsEvent e) {}

    @Override
    public void registerSingleCompletedExecution(ExecutionComplete completeEvent) {}
  }
}