content: /*
   * 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.service.paxos.uncommitted;
  
  import com.google.common.collect.Iterators;
  import com.google.common.collect.Lists;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.SchemaLoader;
  import org.apache.cassandra.Util;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.statements.schema.CreateTableStatement;
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.service.paxos.Ballot;
  import org.apache.cassandra.service.paxos.PaxosState;
  import org.apache.cassandra.utils.ByteBufferUtil;
  import org.apache.cassandra.utils.CloseableIterator;
  
  import static org.apache.cassandra.service.paxos.Ballot.Flag.NONE;
  import static org.apache.cassandra.service.paxos.BallotGenerator.Global.nextBallot;
  import static org.apache.cassandra.service.paxos.Commit.Proposal;
  import static org.apache.cassandra.service.paxos.uncommitted.PaxosUncommittedTests.ALL_RANGES;
  import static org.apache.cassandra.service.paxos.uncommitted.PaxosUncommittedTests.PAXOS_CFS;
  
  public class PaxosUncommittedTrackerIntegrationTest
  {
      protected static String ks;
      protected static final String tbl = "tbl";
      protected static TableMetadata cfm;
  
      @BeforeClass
      public static void setUpClass() throws Exception
      {
          SchemaLoader.prepareServer();
  
          ks = "coordinatorsessiontest";
          cfm = CreateTableStatement.parse("CREATE TABLE tbl (k INT PRIMARY KEY, v INT)", ks).build();
          SchemaLoader.createKeyspace(ks, KeyspaceParams.simple(1), cfm);
      }
  
      @Before
      public void setUp() throws Exception
      {
          PAXOS_CFS.truncateBlocking();
      }
  
      private static DecoratedKey dk(int v)
      {
          return DatabaseDescriptor.getPartitioner().decorateKey(ByteBufferUtil.bytes(v));
      }
  
      @Test
      public void commitCycle()
      {
          PaxosUncommittedTracker tracker = PaxosState.uncommittedTracker();
          PaxosBallotTracker ballotTracker = PaxosState.ballotTracker();
          Assert.assertNull(tracker.getTableState(cfm.id));
          Assert.assertEquals(Ballot.none(), ballotTracker.getLowBound());
          Assert.assertEquals(Ballot.none(), ballotTracker.getHighBound());
  
          try (CloseableIterator<UncommittedPaxosKey> iterator = tracker.uncommittedKeyIterator(cfm.id, ALL_RANGES))
          {
              Assert.assertFalse(iterator.hasNext());
          }
  
          DecoratedKey key = dk(1);
          Ballot ballot = nextBallot(NONE);
          Proposal proposal = new Proposal(ballot, PaxosRowsTest.nonEmptyUpdate(ballot, cfm, key));
  
          try (PaxosState state = PaxosState.get(key, cfm))
          {
              state.promiseIfNewer(proposal.ballot, true);
          }
  
          try (CloseableIterator<UncommittedPaxosKey> iterator = tracker.uncommittedKeyIterator(cfm.id, ALL_RANGES))
          {
              Assert.assertEquals(key, Iterators.getOnlyElement(iterator).getKey());
          }
  
          try (PaxosState state = PaxosState.get(key, cfm))
          {
              state.acceptIfLatest(proposal);
          }
  
          try (CloseableIterator<UncommittedPaxosKey> iterator = tracker.uncommittedKeyIterator(cfm.id, ALL_RANGES))
          {
              Assert.assertEquals(key, Iterators.getOnlyElement(iterator).getKey());
          }
  
          PaxosState.commitDirect(proposal.agreed());
          try (CloseableIterator<UncommittedPaxosKey> iterator = tracker.uncommittedKeyIterator(cfm.id, ALL_RANGES))
          {
              Assert.assertFalse(iterator.hasNext());
          }
      }
  
      @Test
      public void inMemoryCommit()
      {
          PaxosUncommittedTracker tracker = PaxosState.uncommittedTracker();
  
          DecoratedKey key = dk(1);
          Ballot ballot = nextBallot(NONE);
          Proposal proposal = new Proposal(ballot, PaxosRowsTest.nonEmptyUpdate(ballot, cfm, key));
  
          try (PaxosState state = PaxosState.get(key, cfm))
          {
              state.promiseIfNewer(proposal.ballot, true);
              state.acceptIfLatest(proposal);
          }
          try (CloseableIterator<UncommittedPaxosKey> iterator = tracker.uncommittedKeyIterator(cfm.id, ALL_RANGES))
          {
              Assert.assertEquals(key, Iterators.getOnlyElement(iterator).getKey());
          }
  
          Util.flush(PAXOS_CFS);
  
          PaxosState.commitDirect(proposal.agreed());
          try (CloseableIterator<UncommittedPaxosKey> iterator = tracker.uncommittedKeyIterator(cfm.id, ALL_RANGES))
          {
              Assert.assertEquals(Lists.newArrayList(), Lists.newArrayList(iterator));
          }
      }
  }
  