content: /*
   * 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
   *
   * 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 org.apache.calcite.adapter.redis;
  
  import org.apache.calcite.util.trace.CalciteTrace;
  
  import org.apache.commons.lang3.StringUtils;
  import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
  
  import com.google.common.cache.CacheBuilder;
  import com.google.common.cache.CacheLoader;
  import com.google.common.cache.LoadingCache;
  import com.google.common.cache.RemovalListener;
  import com.google.common.cache.RemovalNotification;
  
  import org.slf4j.Logger;
  
  import redis.clients.jedis.Jedis;
  import redis.clients.jedis.JedisPool;
  import redis.clients.jedis.JedisPoolConfig;
  import redis.clients.jedis.Protocol;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Manages connections to the Redis nodes.
   */
  public class RedisJedisManager implements AutoCloseable {
    private static final Logger LOGGER = CalciteTrace.getPlannerTracer();
    private final LoadingCache<String, JedisPool> jedisPoolCache;
    private final JedisPoolConfig jedisPoolConfig;
  
    private final String host;
    private final String password;
    private final int port;
    private final int database;
  
    public RedisJedisManager(String host, int port, int database, String password) {
      JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
      jedisPoolConfig.setMaxTotal(GenericObjectPoolConfig.DEFAULT_MAX_TOTAL);
      jedisPoolConfig.setMaxIdle(GenericObjectPoolConfig.DEFAULT_MAX_IDLE);
      jedisPoolConfig.setMinIdle(GenericObjectPoolConfig.DEFAULT_MIN_IDLE);
      this.host = host;
      this.port = port;
      this.database = database;
      this.password = password;
      this.jedisPoolConfig = jedisPoolConfig;
      this.jedisPoolCache = CacheBuilder.newBuilder()
          .removalListener(new JedisPoolRemovalListener())
          .build(CacheLoader.from(this::createConsumer));
    }
  
    public JedisPool getJedisPool() {
      requireNonNull(host, "host is null");
      return jedisPoolCache.getUnchecked(host);
    }
  
    public Jedis getResource() {
      return getJedisPool().getResource();
    }
  
    private JedisPool createConsumer() {
      String pwd = password;
      if (StringUtils.isEmpty(pwd)) {
        pwd = null;
      }
      return new JedisPool(jedisPoolConfig, host, port, Protocol.DEFAULT_TIMEOUT,
          pwd, database);
    }
  
    /**
     * JedisPoolRemovalListener for remove elements from cache.
     */
    private static class JedisPoolRemovalListener
        implements RemovalListener<String, JedisPool> {
      @Override public void onRemoval(
          RemovalNotification<String, JedisPool> notification) {
        final JedisPool value = requireNonNull(notification.getValue());
        try {
          value.destroy();
        } catch (Exception e) {
          LOGGER.warn("While destroying JedisPool {}", notification.getKey());
        }
      }
    }
  
    @Override public void close() {
      jedisPoolCache.invalidateAll();
    }
  }
  