/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 org.apache.activemq.artemis.core.server.balancing.pools;

import org.apache.activemq.artemis.core.server.balancing.targets.TargetFactory;

import java.util.concurrent.ScheduledExecutorService;

public class DiscoveryPool extends AbstractPool implements DiscoveryService.Listener {
   private final DiscoveryService discoveryService;

   public DiscoveryPool(TargetFactory targetFactory, ScheduledExecutorService scheduledExecutor,
                        int checkPeriod, DiscoveryService discoveryService) {
      super(targetFactory, scheduledExecutor, checkPeriod);

      this.discoveryService = discoveryService;
   }

   @Override
   public void start() throws Exception {
      super.start();

      discoveryService.setListener(this);

      discoveryService.start();
   }

   @Override
   public void stop() throws Exception {
      super.stop();

      if (discoveryService != null) {
         discoveryService.setListener(null);

         discoveryService.stop();
      }
   }

   @Override
   public void entryAdded(DiscoveryService.Entry entry) {
      addTarget(entry.getConnector(), entry.getNodeID());
   }

   @Override
   public void entryRemoved(DiscoveryService.Entry entry) {
      removeTarget(getTarget(entry.getNodeID()));
   }

   @Override
   public void entryUpdated(DiscoveryService.Entry oldEntry, DiscoveryService.Entry newEntry) {
      removeTarget(getTarget(oldEntry.getNodeID()));

      addTarget(newEntry.getConnector(), newEntry.getNodeID());
   }
}
