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.db.virtual;
  
  import java.io.IOException;
  import java.util.Date;
  import java.util.HashMap;
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  import org.apache.cassandra.cql3.UntypedResultSet;
  import org.apache.cassandra.db.ConsistencyLevel;
  import org.apache.cassandra.db.marshal.LongType;
  import org.apache.cassandra.db.marshal.TimestampType;
  import org.apache.cassandra.db.marshal.UTF8Type;
  import org.apache.cassandra.locator.MetaStrategy;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.tcm.Epoch;
  import org.apache.cassandra.tcm.Transformation;
  
  import static java.lang.String.format;
  import static org.apache.cassandra.cql3.QueryProcessor.execute;
  import static org.apache.cassandra.schema.DistributedMetadataLogKeyspace.TABLE_NAME;
  import static org.apache.cassandra.schema.SchemaConstants.METADATA_KEYSPACE_NAME;
  
  public final class ClusterMetadataLogTable extends AbstractVirtualTable
  {
      private static final String EPOCH = "epoch";
      private static final String KIND = "kind";
      private static final String TRANSFORMATION = "transformation";
      private static final String ENTRY_ID = "entry_id";
      private static final String ENTRY_TIME = "entry_time";
  
      ClusterMetadataLogTable(String keyspace)
      {
          super(TableMetadata.builder(keyspace, "cluster_metadata_log")
                             .comment("cluster metadata log")
                             .kind(TableMetadata.Kind.VIRTUAL)
                             .partitioner(MetaStrategy.partitioner)
                             .addPartitionKeyColumn(EPOCH, LongType.instance)
                             .addRegularColumn(KIND, UTF8Type.instance)
                             .addRegularColumn(TRANSFORMATION, UTF8Type.instance)
                             .addRegularColumn(ENTRY_ID, LongType.instance)
                             .addRegularColumn(ENTRY_TIME, TimestampType.instance)
                             .build());
      }
  
      @Override
      public DataSet data()
      {
          SimpleDataSet result = new SimpleDataSet(metadata());
          for (Map.Entry<Long, Map<String, Object>> entry : log(Epoch.FIRST.getEpoch(), Long.MAX_VALUE).entrySet())
          {
              SimpleDataSet data = result.row(entry.getKey());
              for (Map.Entry<String, Object> rowEntry : entry.getValue().entrySet())
                  data = data.column(rowEntry.getKey(), rowEntry.getValue());
          }
          return result;
      }
  
      public static Map<Long, Map<String, Object>> log(long startEpoch, long endEpoch)
      {
          try
          {
              Map<Long, Map<String, Object>> result = new LinkedHashMap<>();
              UntypedResultSet res = execute(format("SELECT epoch, kind, transformation, entry_id, writetime(kind) as wt " +
                                                    "FROM %s.%s WHERE token(epoch) >= token(?) AND token(epoch) <= token(?)", METADATA_KEYSPACE_NAME, TABLE_NAME), ConsistencyLevel.QUORUM, endEpoch, startEpoch);
              for (UntypedResultSet.Row r : res)
              {
                  Transformation.Kind kind = Transformation.Kind.fromId(r.getInt("kind"));
                  Transformation transformation = kind.fromVersionedBytes(r.getBlob("transformation"));
                  Map<String, Object> row = new HashMap<>();
                  row.put(KIND, kind.toString());
                  row.put(TRANSFORMATION, transformation.toString());
                  row.put(ENTRY_ID, r.getLong("entry_id"));
                  row.put(ENTRY_TIME, new Date(r.getLong("wt") / 1000));
                  result.put(r.getLong("epoch"), row);
              }
              return result;
          }
          catch (IOException e)
          {
              throw new RuntimeException(e);
          }
      }
  }
  