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.accord;
  
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import com.google.common.collect.ImmutableList;
  import org.junit.Assert;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import accord.local.Node;
  import accord.local.Node.Id;
  import accord.topology.Shard;
  import accord.topology.Topology;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.dht.IPartitioner;
  import org.apache.cassandra.dht.Murmur3Partitioner;
  import org.apache.cassandra.dht.Range;
  import org.apache.cassandra.dht.Token;
  import org.apache.cassandra.schema.KeyspaceMetadata;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.schema.Keyspaces;
  import org.apache.cassandra.schema.TableId;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.schema.Tables;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.tcm.membership.Location;
  
  import static org.apache.cassandra.cql3.statements.schema.CreateTableStatement.parse;
  import static org.apache.cassandra.service.accord.AccordTopologyUtils.NODE_LIST;
  import static org.apache.cassandra.service.accord.AccordTopologyUtils.NODE_SET;
  import static org.apache.cassandra.service.accord.AccordTopologyUtils.configureCluster;
  import static org.apache.cassandra.service.accord.AccordTopologyUtils.range;
  import static org.apache.cassandra.service.accord.AccordTopologyUtils.token;
  
  public class AccordTopologyTest
  {
      private static final IPartitioner partitioner = Murmur3Partitioner.instance;
      private static TableId tableId = null;
      private static KeyspaceMetadata keyspace = null;
      private static final Location LOCATION = new Location("DC1", "RACK1");
  
      @BeforeClass
      public static void beforeClass() throws Throwable
      {
          DatabaseDescriptor.daemonInitialization();
          DatabaseDescriptor.setPartitionerUnsafe(Murmur3Partitioner.instance);
          TableMetadata table = parse("CREATE TABLE tbl (k int, c int, v int, primary key (k, c)) WITH transactional_mode='full'", "ks").build();
          tableId = table.id;
          keyspace = KeyspaceMetadata.create("ks", KeyspaceParams.simple(3), Tables.of(table));
      }
  
      /**
       * Check converter does the right thing if the ring is constructed with min and max tokens
       */
      @Test
      public void minMaxTokens()
      {
          List<Range<Token>> ranges = ImmutableList.of(range(partitioner.getMinimumToken(), token(-100)),
                                                       range(-100, 100),
                                                       range(token(100), partitioner.getMaximumTokenForSplitting()));
          Assert.assertEquals(partitioner.getMinimumToken(), ranges.get(0).left);
          Assert.assertEquals(partitioner.getMaximumTokenForSplitting(), ranges.get(2).right);
          ClusterMetadata metadata = configureCluster(ranges, Keyspaces.of(keyspace));
  
          Topology topology = AccordTopology.createAccordTopology(metadata);
          Topology expected = new Topology(1,
                                           Shard.create(AccordTopology.fullRange(tableId, partitioner), NODE_LIST, NODE_SET));
  
          Assert.assertEquals(expected, topology);
      }
  
      @Test
      public void wrapAroundRanges()
      {
          List<Range<Token>> ranges = ImmutableList.of(range(-100, 0),
                                                       range(0, 100),
                                                       range(100, -100));
  
          ClusterMetadata metadata = configureCluster(ranges, Keyspaces.of(keyspace));
          Topology topology = AccordTopology.createAccordTopology(metadata);
          Topology expected = new Topology(1,
                                           Shard.create(AccordTopology.fullRange(tableId, partitioner), NODE_LIST, NODE_SET));
  
          Assert.assertEquals(expected, topology);
      }
  
      @Test
      public void fastPath()
      {
          List<Range<Token>> ranges = ImmutableList.of(range(partitioner.getMinimumToken(), token(-100)),
                                                       range(-100, 100),
                                                       range(token(100), partitioner.getMaximumTokenForSplitting()));
          ClusterMetadata metadata = configureCluster(ranges, Keyspaces.of(keyspace));
          Topology topology = AccordTopology.createAccordTopology(metadata);
          Topology expected = new Topology(1,
                                           Shard.create(AccordTopology.fullRange(tableId, partitioner), NODE_LIST, NODE_SET));
          Assert.assertEquals(expected, topology);
  
          topology = AccordTopology.createAccordTopology(metadata.transformer().withFastPathStatusSince(new Id(1), AccordFastPath.Status.UNAVAILABLE, 1, 1).build().metadata);
  
          Set<Node.Id> fastPath = new HashSet<>(NODE_SET);
          fastPath.remove(new Node.Id(1));
  
          expected = new Topology(2,
                                  Shard.create(AccordTopology.fullRange(tableId, partitioner), NODE_LIST, fastPath));
          Assert.assertEquals(expected, topology);
      }
  
      /**
       * Even if there are too many failures to reach quorum, fast path size shouldn't go below quorum size
       */
      @Test
      public void fastPathWithMoreThanMinimumFailedNodes()
      {
          List<Range<Token>> ranges = ImmutableList.of(range(partitioner.getMinimumToken(), token(-100)),
                                                       range(-100, 100),
                                                       range(token(100), partitioner.getMaximumTokenForSplitting()));
          ClusterMetadata metadata = configureCluster(ranges, Keyspaces.of(keyspace));
          Topology topology = AccordTopology.createAccordTopology(metadata);
          Topology expected = new Topology(1,
                                           Shard.create(AccordTopology.fullRange(tableId, partitioner), NODE_LIST, NODE_SET));
          Assert.assertEquals(expected, topology);
  
          metadata = metadata.transformer()
                             .withFastPathStatusSince(new Id(1), AccordFastPath.Status.UNAVAILABLE, 1, 1)
                             .withFastPathStatusSince(new Id(2), AccordFastPath.Status.UNAVAILABLE, 1, 1)
                             .build().metadata;
          topology = AccordTopology.createAccordTopology(metadata);
  
          Set<Node.Id> fastPath = new HashSet<>(NODE_SET);
          fastPath.remove(new Node.Id(1));
  
          expected = new Topology(2,
                                  Shard.create(AccordTopology.fullRange(tableId, partitioner), NODE_LIST, fastPath));
          Assert.assertEquals(expected, topology);
      }
  }
  