/*
    * 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.syncope.core.starter.actuate;
  
  import java.sql.Connection;
  import java.util.concurrent.atomic.AtomicReference;
  import org.apache.syncope.core.persistence.api.DomainHolder;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.boot.actuate.health.Health;
  import org.springframework.boot.actuate.health.HealthIndicator;
  import org.springframework.boot.actuate.health.Status;
  import org.springframework.jdbc.datasource.DataSourceUtils;
  
  public class DomainsHealthIndicator implements HealthIndicator {
  
      protected static final Logger LOG = LoggerFactory.getLogger(DomainsHealthIndicator.class);
  
      protected final DomainHolder domainHolder;
  
      public DomainsHealthIndicator(final DomainHolder domainHolder) {
          this.domainHolder = domainHolder;
      }
  
      @Override
      public Health health() {
          Health.Builder builder = new Health.Builder();
  
          AtomicReference<Boolean> anyDown = new AtomicReference<>(Boolean.FALSE);
  
          domainHolder.getDomains().forEach((key, ds) -> {
              Status status;
  
              Connection conn = null;
              try {
                  conn = DataSourceUtils.getConnection(ds);
                  status = conn.isValid(0) ? Status.UP : Status.OUT_OF_SERVICE;
              } catch (Exception e) {
                  status = Status.DOWN;
                  LOG.debug("When attempting to connect to Domain {}", key, e);
              } finally {
                  if (conn != null) {
                      DataSourceUtils.releaseConnection(conn, ds);
                  }
              }
  
              builder.withDetail(key, status);
              if (status != Status.UP) {
                  anyDown.set(true);
              }
          });
  
          builder.status(anyDown.get() ? Status.DOWN : Status.UP);
  
          return builder.build();
      }
  }