/**
 * 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.datanode;


import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.junit.Test;

import java.net.InetSocketAddress;
import java.util.ArrayList;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;

public class TestDataNodeUUID {

  /**
   * This test makes sure that we have a valid
   * Node ID after the checkNodeUUID is done.
   */
  @Test
  public void testDatanodeUuid() throws Exception {

    final InetSocketAddress NN_ADDR = new InetSocketAddress(
      "localhost", 5020);
    Configuration conf = new HdfsConfiguration();
    conf.set(DFSConfigKeys.DFS_DATANODE_ADDRESS_KEY, "0.0.0.0:0");
    conf.set(DFSConfigKeys.DFS_DATANODE_HTTP_ADDRESS_KEY, "0.0.0.0:0");
    conf.set(DFSConfigKeys.DFS_DATANODE_IPC_ADDRESS_KEY, "0.0.0.0:0");
    FileSystem.setDefaultUri(conf,
      "hdfs://" + NN_ADDR.getHostName() + ":" + NN_ADDR.getPort());
    ArrayList<StorageLocation> locations = new ArrayList<>();

    DataNode dn = new DataNode(conf, locations, null);

    //Assert that Node iD is null
    String nullString = null;
    assertEquals(dn.getDatanodeUuid(), nullString);

    // CheckDataNodeUUID will create an UUID if UUID is null
    dn.checkDatanodeUuid();

    // Make sure that we have a valid DataNodeUUID at that point of time.
    assertNotEquals(dn.getDatanodeUuid(), nullString);
  }
}