/**
    * 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.hadoop.hbase.master.cleaner;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import java.io.IOException;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.FileStatus;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hbase.ChoreService;
  import org.apache.hadoop.hbase.CoordinatedStateManager;
  import org.apache.hadoop.hbase.HBaseTestingUtility;
  import org.apache.hadoop.hbase.HRegionInfo;
  import org.apache.hadoop.hbase.Server;
  import org.apache.hadoop.hbase.ServerName;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.client.ClusterConnection;
  import org.apache.hadoop.hbase.io.HFileLink;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.apache.hadoop.hbase.util.FSUtils;
  import org.apache.hadoop.hbase.util.HFileArchiveUtil;
  import org.apache.hadoop.hbase.zookeeper.MetaTableLocator;
  import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  /**
   * Test the HFileLink Cleaner.
   * HFiles with links cannot be deleted until a link is present.
   */
  @Category(SmallTests.class)
  public class TestHFileLinkCleaner {
  
    private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
  
    @Test
    public void testHFileLinkCleaning() throws Exception {
      Configuration conf = TEST_UTIL.getConfiguration();
      FSUtils.setRootDir(conf, TEST_UTIL.getDataTestDir());
      conf.set(HFileCleaner.MASTER_HFILE_CLEANER_PLUGINS, HFileLinkCleaner.class.getName());
      Path rootDir = FSUtils.getRootDir(conf);
      FileSystem fs = FileSystem.get(conf);
  
      final TableName tableName = TableName.valueOf("test-table");
      final TableName tableLinkName = TableName.valueOf("test-link");
      final String hfileName = "1234567890";
      final String familyName = "cf";
  
      HRegionInfo hri = new HRegionInfo(tableName);
      HRegionInfo hriLink = new HRegionInfo(tableLinkName);
  
      Path archiveDir = HFileArchiveUtil.getArchivePath(conf);
      Path archiveStoreDir = HFileArchiveUtil.getStoreArchivePath(conf,
            tableName, hri.getEncodedName(), familyName);
      Path archiveLinkStoreDir = HFileArchiveUtil.getStoreArchivePath(conf,
            tableLinkName, hriLink.getEncodedName(), familyName);
  
      // Create hfile /hbase/table-link/region/cf/getEncodedName.HFILE(conf);
      Path familyPath = getFamilyDirPath(archiveDir, tableName, hri.getEncodedName(), familyName);
      fs.mkdirs(familyPath);
      Path hfilePath = new Path(familyPath, hfileName);
      fs.createNewFile(hfilePath);
  
      // Create link to hfile
      Path familyLinkPath = getFamilyDirPath(rootDir, tableLinkName,
                                          hriLink.getEncodedName(), familyName);
      fs.mkdirs(familyLinkPath);
      HFileLink.create(conf, fs, familyLinkPath, hri, hfileName);
      Path linkBackRefDir = HFileLink.getBackReferencesDir(archiveStoreDir, hfileName);
      assertTrue(fs.exists(linkBackRefDir));
      FileStatus[] backRefs = fs.listStatus(linkBackRefDir);
      assertEquals(1, backRefs.length);
      Path linkBackRef = backRefs[0].getPath();
  
      // Initialize cleaner
      final long ttl = 1000;
      conf.setLong(TimeToLiveHFileCleaner.TTL_CONF_KEY, ttl);
      Server server = new DummyServer();
      CleanerChore.initChorePool(conf);
     HFileCleaner cleaner = new HFileCleaner(1000, server, conf, fs, archiveDir);
 
     // Link backref cannot be removed
     cleaner.chore();
     assertTrue(fs.exists(linkBackRef));
     assertTrue(fs.exists(hfilePath));
 
     // Link backref can be removed
     fs.rename(FSUtils.getTableDir(rootDir, tableLinkName),
         FSUtils.getTableDir(archiveDir, tableLinkName));
     cleaner.chore();
     assertFalse("Link should be deleted", fs.exists(linkBackRef));
 
     // HFile can be removed
     Thread.sleep(ttl * 2);
     cleaner.chore();
     assertFalse("HFile should be deleted", fs.exists(hfilePath));
 
     // Remove everything
     for (int i = 0; i < 4; ++i) {
       Thread.sleep(ttl * 2);
       cleaner.chore();
     }
     assertFalse("HFile should be deleted", fs.exists(FSUtils.getTableDir(archiveDir, tableName)));
     assertFalse("Link should be deleted", fs.exists(FSUtils.getTableDir(archiveDir, tableLinkName)));
   }
 
   private static Path getFamilyDirPath (final Path rootDir, final TableName table,
     final String region, final String family) {
     return new Path(new Path(FSUtils.getTableDir(rootDir, table), region), family);
   }
 
   static class DummyServer implements Server {
 
     @Override
     public Configuration getConfiguration() {
       return TEST_UTIL.getConfiguration();
     }
 
     @Override
     public ZooKeeperWatcher getZooKeeper() {
       try {
         return new ZooKeeperWatcher(getConfiguration(), "dummy server", this);
       } catch (IOException e) {
         e.printStackTrace();
       }
       return null;
     }
 
     @Override
     public CoordinatedStateManager getCoordinatedStateManager() {
       return null;
     }
 
     @Override
     public ClusterConnection getConnection() {
       return null;
     }
 
     @Override
     public MetaTableLocator getMetaTableLocator() {
       return null;
     }
 
     @Override
     public ServerName getServerName() {
       return ServerName.valueOf("regionserver,60020,000000");
     }
 
     @Override
     public void abort(String why, Throwable e) {}
 
     @Override
     public boolean isAborted() {
       return false;
     }
 
     @Override
     public void stop(String why) {}
 
     @Override
     public boolean isStopped() {
       return false;
     }
 
     @Override
     public ChoreService getChoreService() {
       return null;
     }
   }
 }