/**
 * 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.
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package org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity;

import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.util.Time;
import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppState;
import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptState;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.AppAttemptRemovedSchedulerEvent;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.AppRemovedSchedulerEvent;
import org.junit.Assert;
import org.junit.Test;

public class TestAutoCreatedQueueDeletionPolicy
    extends TestCapacitySchedulerNewQueueAutoCreation {
  private CapacityScheduler cs;
  private AutoCreatedQueueDeletionPolicy policy;

  public void prepareForSchedule() throws Exception{
    super.startScheduler();

    policy = getPolicy();
    cs = getCs();

    policy.editSchedule();
    // There are no queues should be scheduled
    Assert.assertEquals(policy.getMarkedForDeletion().size(), 0);
    Assert.assertEquals(policy.getSentForDeletion().size(), 0);

    createQueue("root.e.e1");
  }

  @Test
  public void testEditSchedule() throws Exception {
    prepareForSchedule();
    // Make sure e not null
    AbstractCSQueue e = (AbstractCSQueue) cs.
        getQueue("root.e");
    Assert.assertNotNull(e);
    Assert.assertTrue(e.isDynamicQueue());

    // Make sure e1 not null
    AbstractCSQueue e1 =  (AbstractCSQueue)cs.
        getQueue("root.e.e1");
    Assert.assertNotNull(e1);
    Assert.assertTrue(e1.isDynamicQueue());
    // signal it because of without submit created
    e1.setLastSubmittedTimestamp(Time.monotonicNow());

    ApplicationAttemptId user0AppAttemptId =
        submitApp(cs, USER0, USER0, "root.e");

    // Wait user0 created successfully.
    GenericTestUtils.waitFor(()-> cs.getQueue(
        "root.e.user_0") != null, 100,
        2000);
    // Make sure user0 not null
    AbstractCSQueue user0 = (AbstractCSQueue) cs
        .getQueue("root.e.user_0");
    Assert.assertNotNull(user0);
    Assert.assertTrue(user0.isDynamicQueue());
    // Make app finished
    AppAttemptRemovedSchedulerEvent event =
        new AppAttemptRemovedSchedulerEvent(user0AppAttemptId,
            RMAppAttemptState.FINISHED, false);
    cs.handle(event);
    AppRemovedSchedulerEvent rEvent = new AppRemovedSchedulerEvent(
        user0AppAttemptId.getApplicationId(), RMAppState.FINISHED);
    cs.handle(rEvent);

    // There are no apps in user0
    Assert.assertEquals(user0.getNumApplications(), 0);

    // Wait the time expired.
    long l1 = user0.getLastSubmittedTimestamp();
    GenericTestUtils.waitFor(() -> {
      long duration = (Time.monotonicNow() - l1)/1000;
      return duration > getCs().
          getConfiguration().getAutoExpiredDeletionTime();
    }, 100, 2000);

    long l2 = e1.getLastSubmittedTimestamp();
    GenericTestUtils.waitFor(() -> {
      long duration = (Time.monotonicNow() - l2)/1000;
      return duration > getCs().
          getConfiguration().getAutoExpiredDeletionTime();
    }, 100, 2000);

    policy.editSchedule();
    // Make sure user_0 , e1 queue
    // will be scheduled to mark for deletion
    // because it is expired for deletion.
    Assert.assertEquals(policy.getMarkedForDeletion().size(), 2);
    Assert.assertTrue(policy.
        getMarkedForDeletion().contains("root.e.user_0"));
    Assert.assertTrue(policy.
        getMarkedForDeletion().contains("root.e.e1"));
    // Make sure the send for deletion is empty for first mark.
    Assert.assertEquals(policy.getSentForDeletion().size(), 0);

    // Make sure user_0 , e1 queue will be scheduled to send for deletion
    policy.prepareForAutoDeletion();
    Assert.assertEquals(policy.getMarkedForDeletion().size(), 0);
    Assert.assertEquals(policy.getSentForDeletion().size(), 2);

    // Make sure e1, user0 not null before trigger remove.
    e1 = (AbstractCSQueue) cs.getQueue("root.e.e1");
    Assert.assertNotNull(e1);
    user0 =  (AbstractCSQueue)cs.getQueue("root.e.user_0");
    Assert.assertNotNull(user0);

    // Make sure e1, user0 will be null after trigger remove.
    policy.triggerAutoDeletionForExpiredQueues();
    Assert.assertEquals(policy.getMarkedForDeletion().size(), 0);
    Assert.assertEquals(policy.getSentForDeletion().size(), 0);

    // Wait e1, user0 auto deleted.
    GenericTestUtils.waitFor(()-> cs.getQueue(
        "root.e.e1") == null,
        100, 2000);
    GenericTestUtils.waitFor(()-> cs.getQueue(
        "root.e.user_0") == null,
        100, 2000);
    e1 = (AbstractCSQueue) cs.getQueue("root.e.e1");
    Assert.assertNull(e1);
    user0 =  (AbstractCSQueue)cs.getQueue("root.e.user_0");
    Assert.assertNull(user0);

    // Make sure e is not null, before schedule.
    e = (AbstractCSQueue) cs.getQueue("root.e");
    Assert.assertNotNull(e);

    // Expired for e
    // Wait e marked for deletion.
    long l3 = e.getLastSubmittedTimestamp();
    GenericTestUtils.waitFor(() -> {
      long duration = (Time.monotonicNow() - l3)/1000;
      return duration > getCs().
          getConfiguration().getAutoExpiredDeletionTime();
    }, 100, 2000);
    policy.editSchedule();
    e = (AbstractCSQueue) cs.getQueue("root.e");
    Assert.assertNotNull(e);
    Assert.assertEquals(policy.getMarkedForDeletion().size(), 1);
    Assert.assertEquals(policy.getSentForDeletion().size(), 0);
    Assert.assertTrue(policy.getMarkedForDeletion().contains("root.e"));

    // Make sure e queue will be scheduled to send for deletion
    policy.prepareForAutoDeletion();
    Assert.assertEquals(policy.getMarkedForDeletion().size(), 0);
    Assert.assertEquals(policy.getSentForDeletion().size(), 1);

    // Make sure e not null before trigger remove.
    e = (AbstractCSQueue) cs.getQueue("root.e");
    Assert.assertNotNull(e);

    // Make sure e will be null after trigger remove.
    policy.triggerAutoDeletionForExpiredQueues();
    // Wait e1 auto deleted.
    GenericTestUtils.waitFor(()-> cs.getQueue(
        "root.e") == null, 100, 2000);
    Assert.assertEquals(policy.getMarkedForDeletion().size(), 0);
    Assert.assertEquals(policy.getSentForDeletion().size(), 0);
    e = (AbstractCSQueue) cs.getQueue("root.e");
    Assert.assertNull(e);
  }
}