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   * 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.cassandra.distributed.test.accord;
  
  import java.io.IOException;
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.function.Function;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.distributed.api.IInvokableInstance;
  import org.apache.cassandra.distributed.api.IMessageFilters;
  import org.apache.cassandra.net.Verb;
  import org.apache.cassandra.service.accord.AccordService;
  
  public class AccordIntegrationTest extends AccordTestBase
  {
      private static final Logger logger = LoggerFactory.getLogger(AccordIntegrationTest.class);
  
      @Override
      protected Logger logger()
      {
          return logger;
      }
  
      @BeforeClass
      public static void setUp() throws IOException
      {
          AccordTestBase.setupCluster(Function.identity(), 2);
      }
      
      @Test
      public void testRecovery() throws Exception
      {
          pauseSimpleProgressLog();
          test(cluster -> {
              IMessageFilters.Filter lostApply = cluster.filters().verbs(Verb.ACCORD_APPLY_REQ.id).drop();
              IMessageFilters.Filter lostCommit = cluster.filters().verbs(Verb.ACCORD_COMMIT_REQ.id).to(2).drop();
  
              String query = "BEGIN TRANSACTION\n" +
                             "  LET row1 = (SELECT v FROM " + qualifiedAccordTableName + " WHERE k=0 AND c=0);\n" +
                             "  SELECT row1.v;\n" +
                             "  IF row1 IS NULL THEN\n" +
                             "    INSERT INTO " + qualifiedAccordTableName + " (k, c, v) VALUES (0, 0, 1);\n" +
                             "  END IF\n" +
                             "COMMIT TRANSACTION";
              // row1.v shouldn't have existed when the txn's SELECT was executed
              assertRowEqualsWithPreemptedRetry(cluster, new Object[] { null }, query);
  
              lostApply.off();
              lostCommit.off();
  
              query = "BEGIN TRANSACTION\n" +
                      "  LET row1 = (SELECT v FROM " + qualifiedAccordTableName + " WHERE k=0 AND c=0);\n" +
                      "  SELECT row1.v;\n" +
                      "  IF row1.v = 1 THEN\n" +
                      "    UPDATE " + qualifiedAccordTableName + " SET v=2 WHERE k = 0 AND c = 0;\n" +
                      "  END IF\n" +
                      "COMMIT TRANSACTION";
              assertRowEqualsWithPreemptedRetry(cluster, new Object[] { 1 }, query);
  
              String check = "BEGIN TRANSACTION\n" +
                      "  SELECT * FROM " + qualifiedAccordTableName + " WHERE k = ? AND c = ?;\n" +
                      "COMMIT TRANSACTION";
              assertRowEqualsWithPreemptedRetry(cluster, new Object[] {0, 0, 2}, check, 0, 0);
  
              query = "BEGIN TRANSACTION\n" +
                      "  LET row1 = (SELECT v FROM " + qualifiedAccordTableName + " WHERE k=0 AND c=0);\n" +
                      "  SELECT row1.v;\n" +
                      "  IF row1 IS NULL THEN\n" +
                      "    INSERT INTO " + qualifiedAccordTableName + " (k, c, v) VALUES (0, 0, 3);\n" +
                      "  END IF\n" +
                      "COMMIT TRANSACTION";
              assertRowEqualsWithPreemptedRetry(cluster, new Object[] { 2 }, query);
  
              assertRowEqualsWithPreemptedRetry(cluster, new Object[] {0, 0, 2}, check, 0, 0);
          });
      }
  
      @Test
      public void testLostCommitReadTriggersFallbackRead() throws Exception
      {
          pauseSimpleProgressLog();
          test(cluster -> {
              // It's expected that the required Read will happen regardless of whether this fails to return a read
              final AtomicBoolean droppedOne = new AtomicBoolean();
              cluster.filters().verbs(Verb.ACCORD_COMMIT_REQ.id).messagesMatching((from, to, iMessage) -> !droppedOne.getAndSet(true)).drop();
  
              String query = "BEGIN TRANSACTION\n" +
                             "  LET row1 = (SELECT * FROM " + qualifiedAccordTableName + " WHERE k = 0 AND c = 0);\n" +
                             "  SELECT row1.v;\n" +
                             "  IF row1 IS NULL THEN\n" +
                             "    INSERT INTO " + qualifiedAccordTableName + " (k, c, v) VALUES (0, 0, 1);\n" +
                             "  END IF\n" +
                             "COMMIT TRANSACTION";
  
              assertRowEqualsWithPreemptedRetry(cluster, new Object[] { null }, query);
  
              String check = "BEGIN TRANSACTION\n" +
                             "  SELECT * FROM " + qualifiedAccordTableName + " WHERE k = ? AND c = ?;\n" +
                             "COMMIT TRANSACTION";
              assertRowEqualsWithPreemptedRetry(cluster, new Object[] { 0, 0, 1 }, check, 0, 0);
          });
      }
  
      private void pauseSimpleProgressLog()
      {
          for (IInvokableInstance instance : SHARED_CLUSTER)
              instance.runOnInstance(() -> AccordService.instance().node().commandStores().forEachCommandStore(cs -> cs.unsafeProgressLog().stop()));
      }
  }
  