/*
 * 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.ozone.om.ha;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.apache.commons.lang3.RandomStringUtils;
import org.apache.hadoop.metrics2.impl.MetricsCollectorImpl;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;

/**
 * Tests for {@link OMHAMetrics}.
 */
public class TestOMHAMetrics {

  private static final MetricsCollectorImpl METRICS_COLLECTOR =
      new MetricsCollectorImpl();
  private static final String NODE_ID =
      "om" + RandomStringUtils.secure().nextNumeric(5);

  @AfterEach
  public void cleanUp() {
    OMHAMetrics.unRegister();
  }

  @Test
  public void testGetMetricsWithLeader() {
    OMHAMetrics omhaMetrics = OMHAMetrics.create(NODE_ID, NODE_ID);

    omhaMetrics.getMetrics(METRICS_COLLECTOR, true);
    assertEquals(1, omhaMetrics.getOmhaInfoOzoneManagerHALeaderState());
  }

  @Test
  public void testGetMetricsWithFollower() {
    String leaderId = "om" + RandomStringUtils.secure().nextNumeric(5);
    OMHAMetrics omhaMetrics = OMHAMetrics.create(NODE_ID, leaderId);

    omhaMetrics.getMetrics(METRICS_COLLECTOR, true);
    assertEquals(0, omhaMetrics.getOmhaInfoOzoneManagerHALeaderState());
  }
}
