com.github.sonus21.rqueue.core.QueueRegistry Maven / Gradle / Ivy

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Asynchronous and delayed task executor
There is a newer version: 2.0.2-RELEASE
/*
 * Copyright 2020 Sonu Kumar
 *
 * 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
 *
 *       https://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.sonus21.rqueue.core;

import com.github.sonus21.rqueue.exception.OverrideException;
import com.github.sonus21.rqueue.exception.QueueDoesNotExist;
import com.github.sonus21.rqueue.listener.QueueDetail;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

public class QueueRegistry {
  private static final Object lock = new Object();
  private static Map queueNameToDetail = new HashMap<>();

  QueueRegistry() {}

  public static QueueDetail get(String queueName) {
    QueueDetail queueDetail = queueNameToDetail.get(queueName);
    if (queueDetail == null) {
      throw new QueueDoesNotExist(queueName);
    }
    return queueDetail;
  }

  public static void register(QueueDetail queueDetail) {
    synchronized (lock) {
      if (queueNameToDetail.containsKey(queueDetail.getName())) {
        throw new OverrideException(queueDetail.getName());
      }
      queueNameToDetail.put(queueDetail.getName(), queueDetail);
      lock.notifyAll();
    }
  }

  public static void delete() {
    synchronized (lock) {
      queueNameToDetail.clear();
      lock.notifyAll();
    }
  }

  public static List getActiveQueues() {
    synchronized (lock) {
      List queues =
          queueNameToDetail.values().stream()
              .filter(QueueDetail::isActive)
              .map(QueueDetail::getName)
              .collect(Collectors.toList());
      lock.notifyAll();
      return queues;
    }
  }

  public static List getActiveQueueDetails() {
    synchronized (lock) {
      List queueDetails =
          queueNameToDetail.values().stream()
              .filter(QueueDetail::isActive)
              .collect(Collectors.toList());
      lock.notifyAll();
      return queueDetails;
    }
  }

  public static Map getActiveQueueMap() {
    synchronized (lock) {
      Map queueDetails =
          queueNameToDetail.values().stream()
              .filter(QueueDetail::isActive)
              .collect(Collectors.toMap(QueueDetail::getName, Function.identity()));
      lock.notifyAll();
      return queueDetails;
    }
  }

  public static int getActiveQueueCount() {
    return getActiveQueues().size();
  }
}