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   * Licensed to the Apache Software Foundation (ASF) under one
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   * distributed with this work for additional information
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   * 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.cassandra.distributed.test.accord;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.cassandra.distributed.api.IInvokableInstance;
  import org.junit.Assert;
  import org.junit.Test;
  
  import org.apache.cassandra.config.CassandraRelevantProperties;
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.ConsistencyLevel;
  import org.apache.cassandra.distributed.shared.ClusterUtils;
  import org.apache.cassandra.distributed.shared.WithProperties;
  import org.apache.cassandra.distributed.test.TestBaseImpl;
  import org.apache.cassandra.service.accord.AccordService;
  import org.apache.cassandra.utils.concurrent.CountDownLatch;
  
  import static org.apache.cassandra.distributed.api.Feature.GOSSIP;
  import static org.apache.cassandra.distributed.api.Feature.NETWORK;
  
  public class AccordJournalIntegrationTest extends TestBaseImpl
  {
      @Test
      public void saveLoadSanityCheck() throws Throwable
      {
          try (WithProperties wp = new WithProperties().set(CassandraRelevantProperties.DTEST_ACCORD_JOURNAL_SANITY_CHECK_ENABLED, "true");
               Cluster cluster = init(Cluster.build(1)
                                             .withoutVNodes()
                                             .start()))
          {
              final String TABLE = createTable(cluster);
              List<Thread> threads = new ArrayList<>();
              int numThreads = 10;
              CountDownLatch latch = CountDownLatch.newCountDownLatch(numThreads);
              AtomicInteger counter = new AtomicInteger();
              for (int i = 0; i < numThreads; i++)
              {
                  int finalI = i;
                  Thread t = new Thread(() -> {
                      latch.decrement();
                      latch.awaitUninterruptibly();
                      try
                      {
                          for (int j = 0; j < 100; j++)
                          {
                              cluster.coordinator(1).execute("BEGIN TRANSACTION\n" +
                                                             "INSERT INTO " + TABLE + "(k, c, v) VALUES (?, ?, ?);\n" +
                                                             "INSERT INTO " + TABLE + "(k, c, v) VALUES (?, ?, ?);\n" +
                                                             "COMMIT TRANSACTION",
                                                             ConsistencyLevel.ALL,
                                                             1, j, finalI * 100 + j,
                                                             2, j, finalI * 100 + j);
                              counter.incrementAndGet();
                          }
                      }
                      catch (Throwable throwable)
                      {
                          throwable.printStackTrace();
                      }
                  });
                  t.start();
                  threads.add(t);
              }
              for (Thread thread : threads)
                  thread.join();
  
              cluster.coordinator(1).execute("SELECT * FROM " + TABLE + " WHERE k = ?;", ConsistencyLevel.SERIAL, 1);
          }
      }
  
      @Test
      public void memtableStateReloadingTest() throws Throwable
      {
          try (Cluster cluster = Cluster.build(1)
                                        .withoutVNodes()
                                        .start())
          {
              cluster.schemaChange("CREATE KEYSPACE " + KEYSPACE + " WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1};");
              final String TABLE = createTable(cluster);
  
              insertData(cluster, TABLE);
  
              Object[][] before = cluster.coordinator(1).execute("SELECT * FROM " + TABLE + " WHERE k = ?;", ConsistencyLevel.SERIAL, 1);
  
              cluster.get(1).runOnInstance(() -> {
                  ((AccordService) AccordService.instance()).journal().closeCurrentSegmentForTestingIfNonEmpty();
              });
              ClusterUtils.stopUnchecked(cluster.get(1));
              cluster.get(1).startup();
  
              Object[][] after = cluster.coordinator(1).execute("SELECT * FROM " + TABLE + " WHERE k = ?;", ConsistencyLevel.SERIAL, 1);
              Assert.assertEquals(before.length, after.length);
              for (int i = 0; i < before.length; i++)
              {
                  Assert.assertTrue(Arrays.equals(before[i], after[i]));
              }
          }
      }
  
      @Test
      public void restartWithEpochChanges() throws IOException
      {
          try (Cluster cluster = Cluster.build(3).withoutVNodes().withConfig(c -> c.with(GOSSIP).with(NETWORK)).start())
          {
              init(cluster);
              final String TABLE = createTable(cluster);
              cluster.get(1).nodetoolResult("cms", "reconfigure", "3").asserts().success();
  
              insertData(cluster, TABLE);
  
              IInvokableInstance restartNode = cluster.get(1);
              ClusterUtils.stopUnchecked(restartNode);
  
              // make epoch changes
              for (int i = 0; i < 10; i++)
                  cluster.schemaChange("ALTER TABLE " + TABLE + " WITH comment = 'change " + i + "'", true, cluster.get(2));
  
              restartNode.startup();
              insertData(cluster, TABLE);
          }
      }
  
      private void insertData(Cluster cluster, String TABLE) {
          for (int j = 0; j < 1_000; j++)
          {
              cluster.coordinator(1).execute("BEGIN TRANSACTION\n" +
                                             "INSERT INTO " + TABLE + "(k, c, v) VALUES (?, ?, ?);\n" +
                                             "COMMIT TRANSACTION",
                                             ConsistencyLevel.ALL,
                                             j, j, 1
              );
          }
      }
  
      private String createTable(Cluster cluster) {
          final String TABLE = KEYSPACE + ".test_table";
          cluster.schemaChange("CREATE TABLE " + TABLE + " (k int, c int, v int, primary key (k, c)) WITH transactional_mode='full'");
          return TABLE;
      }
  }