io.mapsmessaging.storage.impl.expired.ExpireStorableTaskManager Maven / Gradle / Ivy

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A generic data store keyed by a Long

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/*
 *   Copyright [2020 - 2022]   [Matthew Buckton]
 *
 *    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 io.mapsmessaging.storage.impl.expired;

import io.mapsmessaging.storage.ExpiredMonitor;
import io.mapsmessaging.storage.Storable;
import io.mapsmessaging.storage.impl.file.TaskQueue;
import java.io.Closeable;
import java.io.IOException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

public class ExpireStorableTaskManager implements Closeable {

  private final ExpiredMonitor storage;
  private final TaskQueue taskScheduler;
  private final int poll;
  private Future expiryTask;
  private boolean paused;

  public ExpireStorableTaskManager(ExpiredMonitor storage, TaskQueue taskScheduler, int poll) {
    this.storage = storage;
    this.taskScheduler = taskScheduler;
    this.poll = poll;
    paused = false;
    expiryTask = null;
  }

  public void pause() {
    if (!paused) {
      paused = true;
      if (expiryTask != null) {
        expiryTask.cancel(false);
      }
    }
  }

  public void resume() {
    if (paused) {
      paused = false;
      if (expiryTask != null) {
        schedulePoll();
      }
    }
  }

  @Override
  public void close() throws IOException {
    if (expiryTask != null) {
      expiryTask.cancel(true);
      expiryTask = null;
    }
  }

  public void schedulePoll() {
    if(expiryTask == null || expiryTask.isDone() || expiryTask.isCancelled()) {
      expiryTask = taskScheduler.schedule(new IndexExpiryMonitorTask(storage), poll, TimeUnit.SECONDS);
    }
  }

  public void added(T object) {
    if (object.getExpiry() > 0 && expiryTask == null) {
      schedulePoll();
    }

  }

}