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   * Licensed to the Apache Software Foundation (ASF) under one
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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,
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.service.accord;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Random;
  
  import org.junit.Assert;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import accord.api.Journal;
  import accord.local.Command;
  import accord.local.StoreParticipants;
  import accord.primitives.Ballot;
  import accord.primitives.Participants;
  import accord.primitives.RoutingKeys;
  import accord.primitives.SaveStatus;
  import accord.primitives.Status;
  import accord.primitives.TxnId;
  import accord.utils.AccordGens;
  import accord.utils.RandomSource;
  import org.apache.cassandra.SchemaLoader;
  import org.apache.cassandra.ServerTestUtils;
  import org.apache.cassandra.config.CassandraRelevantProperties;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.dht.ByteOrderedPartitioner;
  import org.apache.cassandra.io.util.File;
  import org.apache.cassandra.journal.TestParams;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.schema.Schema;
  import org.apache.cassandra.schema.TableId;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.service.StorageService;
  import org.apache.cassandra.service.accord.api.TokenKey;
  import org.apache.cassandra.service.consensus.TransactionalMode;
  import org.apache.cassandra.utils.StorageCompatibilityMode;
  
  import static org.apache.cassandra.cql3.statements.schema.CreateTableStatement.parse;
  
  public class AccordJournalOrderTest
  {
      @BeforeClass
      public static void beforeClass() throws Throwable
      {
          CassandraRelevantProperties.JUNIT_STORAGE_COMPATIBILITY_MODE.setEnum(StorageCompatibilityMode.NONE);
          SchemaLoader.prepareServer();
          SchemaLoader.createKeyspace("ks", KeyspaceParams.simple(1),
                                      parse("CREATE TABLE tbl (k int, c int, v int, primary key (k, c)) WITH transactional_mode='full'", "ks"));
          TableMetadata tbl = Schema.instance.getTableMetadata("ks", "tbl");
          Assert.assertEquals(TransactionalMode.full, tbl.params.transactionalMode);
          StorageService.instance.initServer();
      }
  
      @Test
      public void simpleKeyTest()
      {
          if (new File(DatabaseDescriptor.getAccordJournalDirectory()).exists())
              ServerTestUtils.cleanupDirectory(DatabaseDescriptor.getAccordJournalDirectory());
          AccordJournal accordJournal = new AccordJournal(TestParams.INSTANCE);
          accordJournal.start(null);
          RandomSource randomSource = RandomSource.wrap(new Random(0));
          TxnId id1 = AccordGens.txnIds().next(randomSource);
          TxnId id2 = AccordGens.txnIds().next(randomSource);
  
          Map<JournalKey, Integer> res = new HashMap<>();
          for (int i = 0; i < 10_000; i++)
          {
              TxnId txnId = randomSource.nextBoolean() ? id1 : id2;
              JournalKey key = new JournalKey(txnId, JournalKey.Type.COMMAND_DIFF, randomSource.nextInt(5));
              res.compute(key, (k, prev) -> prev == null ? 1 : prev + 1);
              Participants<?> participants = RoutingKeys.of(new TokenKey(TableId.generate(), new ByteOrderedPartitioner.BytesToken(new byte[1])));
              Command command = Command.NotDefined.notDefined(txnId, SaveStatus.NotDefined, Status.Durability.NotDurable, StoreParticipants.create(null, participants, null, null, participants, participants), Ballot.ZERO);
              accordJournal.saveCommand(key.commandStoreId,
                                        new Journal.CommandUpdate(null, command),
                                        () -> {});
          }
  
          Runnable check = () -> {
              for (JournalKey key : res.keySet())
              {
                  AccordJournal.Builder diffs = accordJournal.load(key.commandStoreId, key.id);
                  Assert.assertEquals(String.format("%d != %d for key %s", diffs.count(), res.get(key).intValue(), key),
                                      diffs.count(), res.get(key).intValue());
              }
          };
  
          check.run();
          accordJournal.closeCurrentSegmentForTestingIfNonEmpty();
          check.run();
      }
  }