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.ambari.server.api.services;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.UUID;
  
  import jakarta.ws.rs.WebApplicationException;
  import jakarta.ws.rs.core.Response;
  
  import org.apache.ambari.server.orm.dao.KeyValueDAO;
  import org.apache.ambari.server.orm.entities.KeyValueEntity;
  
  import com.google.inject.Inject;
  import com.google.inject.Singleton;
  
  @Singleton
  public class PersistKeyValueImpl {
  
    @Inject
    KeyValueDAO keyValueDAO;
  
    public String generateKey() {
      return UUID.randomUUID().toString();
    }
  
    public Collection<String> generateKeys(int number) {
      List<String> keys = new ArrayList<>(number);
      for (int i = 0; i < number; i++) {
        keys.add(generateKey());
      }
      return keys;
    }
  
    public synchronized String getValue(String key) {
      KeyValueEntity keyValueEntity = keyValueDAO.findByKey(key);
      if (keyValueEntity != null) {
        return keyValueEntity.getValue();
      }
      throw new WebApplicationException(Response.Status.NOT_FOUND);
    }
  
    public synchronized String put(String value) {
      String key = generateKey();
      put(key, value);
      return key;
    }
  
    public synchronized void put(String key, String value) {
      KeyValueEntity keyValueEntity = keyValueDAO.findByKey(key);
      if (keyValueEntity != null) {
        keyValueEntity.setValue(value);
        keyValueDAO.merge(keyValueEntity);
      } else {
        keyValueEntity = new KeyValueEntity();
        keyValueEntity.setKey(key);
        keyValueEntity.setValue(value);
        keyValueDAO.create(keyValueEntity);
      }
    }
    
    public synchronized Map<String, String> getAllKeyValues() {
      Map<String, String> map = new HashMap<>();
      for (KeyValueEntity keyValueEntity : keyValueDAO.findAll()) {
        map.put(keyValueEntity.getKey(), keyValueEntity.getValue());
      }
      return map;
    }
  }
  