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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.
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  package org.apache.cassandra.service.paxos.uncommitted;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.UUID;
  
  import com.google.common.collect.Iterators;
  import com.google.common.collect.Lists;
  import org.junit.*;
  
  import org.apache.cassandra.SchemaLoader;
  import org.apache.cassandra.cql3.ColumnIdentifier;
  import org.apache.cassandra.cql3.statements.schema.CreateTableStatement;
  import org.apache.cassandra.db.*;
  import org.apache.cassandra.db.marshal.UUIDType;
  import org.apache.cassandra.db.partitions.PartitionUpdate;
  import org.apache.cassandra.db.partitions.UnfilteredPartitionIterator;
  import org.apache.cassandra.db.rows.BTreeRow;
  import org.apache.cassandra.db.rows.BufferCell;
  import org.apache.cassandra.db.rows.Cell;
  import org.apache.cassandra.db.rows.Row;
  import org.apache.cassandra.db.rows.UnfilteredRowIterator;
  import org.apache.cassandra.schema.ColumnMetadata;
  import org.apache.cassandra.schema.TableId;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.service.paxos.Ballot;
  import org.apache.cassandra.service.paxos.Commit;
  import org.apache.cassandra.tcm.Epoch;
  import org.apache.cassandra.utils.ByteBufferUtil;
  import org.apache.cassandra.utils.CloseableIterator;
  import org.apache.cassandra.utils.FBUtilities;
  import org.apache.cassandra.utils.btree.BTree;
  
  import static org.apache.cassandra.service.paxos.uncommitted.PaxosUncommittedTests.PAXOS_CFM;
  import static org.apache.cassandra.service.paxos.uncommitted.PaxosUncommittedTests.PAXOS_CFS;
  import static org.apache.cassandra.service.paxos.uncommitted.PaxosUncommittedTests.createBallots;
  import static org.apache.cassandra.service.paxos.uncommitted.PaxosUncommittedTests.dk;
  
  public class PaxosRowsTest
  {
      protected static String ks;
      protected static final String tbl = "tbl";
      protected static TableMetadata metadata;
      protected static TableId tableId;
  
      static Commit emptyCommitFor(Ballot ballot, DecoratedKey key)
      {
          return new Commit(ballot, PartitionUpdate.emptyUpdate(metadata, key));
      }
  
      static Commit nonEmptyCommitFor(Ballot ballot, DecoratedKey key)
      {
          return new Commit(ballot, nonEmptyUpdate(ballot, metadata, key));
      }
  
      static PartitionUpdate nonEmptyUpdate(Ballot ballot, TableMetadata cfm, DecoratedKey key)
      {
          ColumnMetadata valueColumn = cfm.getColumn(new ColumnIdentifier("v", false));
          return PartitionUpdate.singleRowUpdate(cfm, key, BTreeRow.create(Clustering.EMPTY, LivenessInfo.EMPTY, Row.Deletion.LIVE, BTree.singleton(new BufferCell(valueColumn, ballot.unixMicros(), Cell.NO_TTL, Cell.NO_DELETION_TIME, ByteBufferUtil.bytes(1), null))));
      }
  
      static Row paxosRowFor(DecoratedKey key)
      {
          SinglePartitionReadCommand command = SinglePartitionReadCommand.create(PAXOS_CFM,
                  FBUtilities.nowInSeconds(),
                  key,
                  new BufferClustering(UUIDType.instance.decompose(tableId.asUUID())));
          try (ReadExecutionController opGroup = command.executionController();
               UnfilteredPartitionIterator iterator = command.executeLocally(opGroup);
               UnfilteredRowIterator partition = Iterators.getOnlyElement(iterator))
          {
              return (Row) Iterators.getOnlyElement(partition);
          }
      }
  
      @BeforeClass
      public static void setUpClass() throws Exception
      {
          SchemaLoader.prepareServer();
  
          ks = "coordinatorsessiontest";
          metadata = CreateTableStatement.parse("CREATE TABLE tbl (k INT PRIMARY KEY, v INT)", ks).epoch(Epoch.create(100)).build();
          tableId = metadata.id;
      }
  
      @Before
      public void setUp() throws Exception
      {
          PAXOS_CFS.truncateBlocking();
      }
  
      @Test
      public void testRowInterpretation()
      {
          DecoratedKey key = dk(Integer.MAX_VALUE);
          Ballot[] ballots = createBallots(3);
  
          SystemKeyspace.savePaxosWritePromise(key, metadata, ballots[0]);
          Assert.assertEquals(new PaxosKeyState(tableId, key, ballots[0], false), PaxosRows.getCommitState(key, paxosRowFor(key), null));
          SystemKeyspace.savePaxosProposal(emptyCommitFor(ballots[0], key));
          Assert.assertEquals(new PaxosKeyState(tableId, key, ballots[0], true), PaxosRows.getCommitState(key, paxosRowFor(key), null));
  
          SystemKeyspace.savePaxosWritePromise(key, metadata, ballots[1]);
          Assert.assertEquals(new PaxosKeyState(tableId, key, ballots[1], false), PaxosRows.getCommitState(key, paxosRowFor(key), null));
          SystemKeyspace.savePaxosProposal(nonEmptyCommitFor(ballots[1], key));
          Assert.assertEquals(new PaxosKeyState(tableId, key, ballots[1], false), PaxosRows.getCommitState(key, paxosRowFor(key), null));
          SystemKeyspace.savePaxosCommit(nonEmptyCommitFor(ballots[1], key));
          Assert.assertEquals(new PaxosKeyState(tableId, key, ballots[1], true), PaxosRows.getCommitState(key, paxosRowFor(key), null));
  
          // test cfid filter mismatch
          Assert.assertNull(PaxosRows.getCommitState(key, paxosRowFor(key), TableId.fromUUID(UUID.randomUUID())));
  
          SystemKeyspace.savePaxosCommit(emptyCommitFor(ballots[2], key));
          Assert.assertEquals(new PaxosKeyState(tableId, key, ballots[2], true), PaxosRows.getCommitState(key, paxosRowFor(key), null));
      }
  
      @Test
      public void testIterator()
      {
          Ballot[] ballots = createBallots(10);
          List<PaxosKeyState> expected = new ArrayList<>(ballots.length);
          for (int i=0; i<ballots.length; i++)
          {
              Ballot ballot = ballots[i];
              DecoratedKey key = dk(i);
  
              if (i%2 == 0)
              {
                  SystemKeyspace.savePaxosProposal(nonEmptyCommitFor(ballot, key));
                  expected.add(new PaxosKeyState(tableId, key, ballot, false));
              }
              else
              {
                  SystemKeyspace.savePaxosCommit(nonEmptyCommitFor(ballot, key));
                  expected.add(new PaxosKeyState(tableId, key, ballot, true));
              }
          }
  
          PartitionRangeReadCommand command = PartitionRangeReadCommand.allDataRead(PAXOS_CFM, FBUtilities.nowInSeconds());
          try (ReadExecutionController opGroup = command.executionController();
               UnfilteredPartitionIterator partitions = command.executeLocally(opGroup);
               CloseableIterator<PaxosKeyState> iterator = PaxosRows.toIterator(partitions, metadata.id, true))
          {
              Assert.assertEquals(expected, Lists.newArrayList(iterator));
          }
      }
  }
  