/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.ozone.om;

import java.io.IOException;
import java.util.UUID;

import org.apache.hadoop.hdds.conf.OzoneConfiguration;
import org.apache.hadoop.ozone.MiniOzoneCluster;
import org.apache.hadoop.security.authentication.client.AuthenticationException;

import static org.apache.hadoop.ozone.OzoneConfigKeys.OZONE_OPEN_KEY_EXPIRE_THRESHOLD_SECONDS;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

/**
 * Test Ozone Manager Init.
 */
public class TestOmInit {
  private static MiniOzoneCluster cluster = null;
  private static OMMetrics omMetrics;
  private static OzoneConfiguration conf;
  private static String clusterId;
  private static String scmId;
  private static String omId;

  @Rule
  public ExpectedException exception = ExpectedException.none();

  /**
   * Create a MiniDFSCluster for testing.
   * <p>
   * Ozone is made active by setting OZONE_ENABLED = true
   *
   * @throws IOException
   */
  @BeforeClass
  public static void init() throws Exception {
    conf = new OzoneConfiguration();
    clusterId = UUID.randomUUID().toString();
    scmId = UUID.randomUUID().toString();
    omId = UUID.randomUUID().toString();
    conf.setInt(OZONE_OPEN_KEY_EXPIRE_THRESHOLD_SECONDS, 2);
    cluster =  MiniOzoneCluster.newBuilder(conf)
        .setClusterId(clusterId)
        .setScmId(scmId)
        .setOmId(omId)
        .build();
    cluster.waitForClusterToBeReady();
    omMetrics = cluster.getOzoneManager().getMetrics();
  }

  /**
   * Shutdown MiniDFSCluster.
   */
  @AfterClass
  public static void shutdown() {
    if (cluster != null) {
      cluster.shutdown();
    }
  }


  /**
   * Tests the OM Initialization.
   * @throws IOException, AuthenticationException
   */
  @Test
  public void testOmInitAgain() throws IOException,
      AuthenticationException {
    // Stop the Ozone Manager
    cluster.getOzoneManager().stop();
    // Now try to init the OM again. It should succeed
    Assert.assertTrue(OzoneManager.omInit(conf));
  }

}