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   * 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.orm.dao;
  
  import java.sql.SQLException;
  import java.util.Set;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.H2DatabaseCleaner;
  import org.apache.ambari.server.orm.GuiceJpaInitializer;
  import org.apache.ambari.server.orm.InMemoryDefaultTestModule;
  import org.apache.ambari.server.orm.cache.HostConfigMapping;
  import org.apache.ambari.server.orm.cache.HostConfigMappingImpl;
  import org.apache.ambari.server.orm.entities.HostEntity;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  import com.google.inject.Guice;
  import com.google.inject.Inject;
  import com.google.inject.Injector;
  
  import junit.framework.Assert;
  
  /**
   * Tests host config mapping DAO and Entities
   */
  public class HostConfigMappingDAOTest {
  
    private Injector injector;
  
    @Inject
    private HostConfigMappingDAO hostConfigMappingDAO;
  
    @Inject
    private HostDAO hostDAO;
    
    @Before
     public void setup() throws AmbariException{
      injector = Guice.createInjector(new InMemoryDefaultTestModule());
      injector.getInstance(GuiceJpaInitializer.class);
      
      hostConfigMappingDAO = injector.getInstance(HostConfigMappingDAO.class);
      hostDAO = injector.getInstance(HostDAO.class);
    }
  
    @After
    public void teardown() throws AmbariException, SQLException {
      H2DatabaseCleaner.clearDatabaseAndStopPersistenceService(injector);
    }
    
    private HostConfigMapping createEntity(long clusterId, String hostName, String type, String version) throws Exception {
      HostConfigMapping hostConfigMappingEntity = new HostConfigMappingImpl();
      hostConfigMappingEntity.setClusterId(Long.valueOf(clusterId));
      hostConfigMappingEntity.setCreateTimestamp(Long.valueOf(System.currentTimeMillis()));
  
      HostEntity hostEntity = hostDAO.findByName(hostName);
      if (hostEntity == null) {
        hostEntity = new HostEntity();
        hostEntity.setHostName(hostName);
        hostDAO.create(hostEntity);
      }
  
      hostConfigMappingEntity.setHostId(hostEntity.getHostId());
      hostConfigMappingEntity.setSelected(1);
      hostConfigMappingEntity.setType(type);
      hostConfigMappingEntity.setVersion(version);
      hostConfigMappingEntity.setUser("_test");
  
      hostConfigMappingDAO.create(hostConfigMappingEntity);
      
      return hostConfigMappingEntity;
    }
    
    @Test
    public void testCreate() throws Exception {
      createEntity(1L, "h1", "global", "v1");
    }
    
  
    @Test
    public void testFindByType() throws Exception {
      HostConfigMapping source = createEntity(1L, "h1", "global", "v1");
      HostEntity hostEntity = hostDAO.findByName("h1");
      
      Set<HostConfigMapping> target = hostConfigMappingDAO.findByType(1L, hostEntity.getHostId(), "global");
  
      Assert.assertEquals("Expected one result", 1, target.size());
      
      for (HostConfigMapping item : target) 
        Assert.assertEquals("Expected version 'v1'", source.getVersion(), item.getVersion());
    }
    
    @Test
    public void testMerge() throws Exception {
      HostConfigMapping source = createEntity(1L, "h1", "global", "v1");
      HostEntity hostEntity = hostDAO.findByName("h1");
  
      Set<HostConfigMapping> target = hostConfigMappingDAO.findByType(1L, hostEntity.getHostId(), "global");
      Assert.assertEquals("Expected one result", 1, target.size());
      
      HostConfigMapping toChange = null;
      
      for (HostConfigMapping item: target) {
        Assert.assertEquals("Expected version 'v1'", source.getVersion(), item.getVersion());
        Assert.assertEquals("Expected selected flag 1", 1, (int)item.getSelected());
        toChange = item;
        toChange.setSelected(0);
      }
      
      hostConfigMappingDAO.merge(toChange);
      
      target = hostConfigMappingDAO.findByType(1L, hostEntity.getHostId(), "global");
      Assert.assertEquals("Expected one result", 1, target.size());
      
      for (HostConfigMapping item: target) {
        Assert.assertEquals("Expected version 'v1'", source.getVersion(), item.getVersion());
        Assert.assertEquals("Expected selected flag 0", 0, (int)item.getSelected());
      }
    }
    
    @Test
    public void testFindSelected() throws Exception {
      createEntity(1L, "h1", "global", "version1");
      HostConfigMapping coreSiteConfigV1 = createEntity(1L, "h1", "core-site", "version1");
      HostEntity hostEntity = hostDAO.findByName("h1");
      
      Set<HostConfigMapping> targets = hostConfigMappingDAO.findSelected(1L, hostEntity.getHostId());
      Assert.assertEquals("Expected two entities", 2, targets.size());
  
      coreSiteConfigV1.setSelected(0);
      hostConfigMappingDAO.merge(coreSiteConfigV1);
      
      createEntity(1L, "h1", "core-site", "version2");
  
      targets = hostConfigMappingDAO.findSelected(1L, hostEntity.getHostId());
      Assert.assertEquals("Expected two entities", 2, targets.size());
    }
    
    @Test
    public void testFindSelectedByType() throws Exception {
      HostConfigMapping entity1 = createEntity(1L, "h1", "global", "version1");
      HostEntity hostEntity = hostDAO.findByName("h1");
      
      HostConfigMapping target = hostConfigMappingDAO.findSelectedByType(1L, hostEntity.getHostId(), "core-site");
      Assert.assertNull("Expected null entity for type 'core-site'", target);
      
      target = hostConfigMappingDAO.findSelectedByType(1L, hostEntity.getHostId(), "global");
      Assert.assertNotNull("Expected non-null entity for type 'global'", target);
      Assert.assertEquals("Expected version to be '" + entity1.getVersion() + "'", entity1.getVersion(), target.getVersion());
      
      target.setSelected(0);
      hostConfigMappingDAO.merge(target);
      
      HostConfigMapping entity2 = createEntity(1L, "h1", "global", "version2");
      
      target = hostConfigMappingDAO.findSelectedByType(1L, hostEntity.getHostId(), "global");
      Assert.assertNotNull("Expected non-null entity for type 'global'", target);
      
      Assert.assertEquals("Expected version to be '" + entity2.getVersion() + "'", entity2.getVersion(), target.getVersion());
      
      Assert.assertEquals("Expected instance equality", entity2, target);
    }
    
    @Test
    public void testEmptyTable() throws Exception {
      createEntity(1L, "h1", "global", "version1");
  
      HostEntity hostEntity = hostDAO.findByName("h1");
      hostConfigMappingDAO.removeByClusterAndHostName(1L, "h1");
      HostConfigMapping target = hostConfigMappingDAO.findSelectedByType(1L, hostEntity.getHostId(), "core-site");
      
      Assert.assertEquals(null, target);
    }
  }
  