/**
 * 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.hdfs.server.namenode;

import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.Matchers.anyObject;
import static org.mockito.Matchers.anyString;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.verify;

import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.Test;

public class TestLeaseManager{
  public static final Log LOG = LogFactory.getLog(TestLeaseManager.class);
  
  public static void createUnderConstructionFile(FileSystem fs, Path path) throws IOException {
    FSDataOutputStream stm = fs
        .create(path, true, 4096, (short) 1, (long) 1024);
    stm.writeBytes("test data");
  }
  
  @Test
  public void testLeaseManagerWithRename() throws IOException {
    Configuration conf = new Configuration();
    conf.setFloat("fs.trash.interval", 60);
    MiniDFSCluster cluster = null;
    try {
      cluster = new MiniDFSCluster(conf, 0, true, null);
      DistributedFileSystem fs = DFSUtil.convertToDFS(cluster.getFileSystem());
      LeaseManager manager = cluster.getNameNode().getNamesystem().leaseManager;
      Path src = new Path("/test/testRename");
      createUnderConstructionFile(fs, src);
      
      // rename to file location
      fs.rename(src, new Path("/test/testRename2"));
      assertTrue(fs.exists(new Path("/test/testRename2")));
      // verify the lease
      assertNotNull("Can not find the lease.", manager.getLeaseByPath("/test/testRename2"));
      
      // rename to the dir location
      fs.rename(new Path("/test/testRename2"), new Path("/"));
      assertTrue(fs.exists(new Path("/testRename2")));
      // verify the lease
      assertNotNull("Can not find the lease.", manager.getLeaseByPath("/testRename2"));

    } finally {
      if (cluster != null) {
        cluster.shutdown();
      }
    }
  }

  /*
   * test case: two leases are added for a singler holder, should use
   * the internalReleaseOne method
   */
  @Test
  public void testMultiPathLeaseRecovery()
      throws IOException, InterruptedException {
    Configuration conf = new Configuration();
    MiniDFSCluster cluster = null;
    try {
      cluster = new MiniDFSCluster(conf, 3, true, null);
      NameNode namenode = cluster.getNameNode();
      FSNamesystem spyNamesystem = spy(namenode.getNamesystem());
      LeaseManager leaseManager = new LeaseManager(spyNamesystem);

      spyNamesystem.leaseManager = leaseManager;
      spyNamesystem.lmthread.interrupt();

      String holder = "client-1";
      String path1 = "/file-1";
      String path2 = "/file-2";

      leaseManager.setLeasePeriod(1, 2);
      leaseManager.addLease(holder, path1, System.currentTimeMillis());
      leaseManager.addLease(holder, path2, System.currentTimeMillis());
      Thread.sleep(1000);

      synchronized (spyNamesystem) { // checkLeases is always called with FSN lock
        leaseManager.checkLeases();
      }

      verify(spyNamesystem).internalReleaseLeaseOne((LeaseManager.Lease)anyObject(), eq("/file-1"), eq(false));
      verify(spyNamesystem).internalReleaseLeaseOne((LeaseManager.Lease)anyObject(), eq("/file-2"), eq(false));
      verify(spyNamesystem, never()).internalReleaseLease((LeaseManager.Lease)anyObject(), anyString(), (INodeFileUnderConstruction)anyObject());
    } finally {
      if (cluster != null) {
        cluster.shutdown();
      }
    }
  }
}