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 com.codahale.metrics.Snapshot;
  import org.apache.cassandra.cql3.statements.BatchStatement;
  import org.apache.cassandra.db.marshal.DoubleType;
  import org.apache.cassandra.db.marshal.LongType;
  import org.apache.cassandra.db.marshal.UTF8Type;
  import org.apache.cassandra.dht.LocalPartitioner;
  import org.apache.cassandra.metrics.BatchMetrics;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.service.ClientWarn;
  
  /**
   * @deprecated The "batch_metrics" virtual table is no longer used, and will be removed in a future release. Please,
   * use either "system_metrics.batch_group", or "system_metrics.type_histogram" virtual tables instead.
   */
  @Deprecated(since = "5.1")
  public class BatchMetricsTable extends AbstractVirtualTable
  {
      protected static final String TABLE_NAME = "batch_metrics";
      private static final String PARTITIONS_PER_LOGGED_BATCH = "partitions_per_logged_batch";
      private static final String PARTITIONS_PER_UNLOGGED_BATCH = "partitions_per_unlogged_batch";
      private static final String PARTITIONS_PER_COUNTER_BATCH = "partitions_per_counter_batch";
      private final static String P50 = "p50th";
      private final static String P99 = "p99th";
      private final static String P999 = "p999th";
      private final static String MAX = "max";
  
      BatchMetricsTable(String keyspace)
      {
          super(TableMetadata.builder(keyspace, TABLE_NAME)
                             .comment("Metrics specific to batch statements")
                             .kind(TableMetadata.Kind.VIRTUAL)
                             .partitioner(new LocalPartitioner(UTF8Type.instance))
                             .addPartitionKeyColumn("name", UTF8Type.instance)
                             .addRegularColumn(P50, DoubleType.instance)
                             .addRegularColumn(P99, DoubleType.instance)
                             .addRegularColumn(P999, DoubleType.instance)
                             .addRegularColumn(MAX, LongType.instance)
                             .build());
      }
  
      @Override
      public DataSet data()
      {
          SimpleDataSet result = new SimpleDataSet(metadata());
          BatchMetrics metrics = BatchStatement.metrics;
          addRow(result, PARTITIONS_PER_LOGGED_BATCH, metrics.partitionsPerLoggedBatch.getSnapshot());
          addRow(result, PARTITIONS_PER_UNLOGGED_BATCH, metrics.partitionsPerUnloggedBatch.getSnapshot());
          addRow(result, PARTITIONS_PER_COUNTER_BATCH, metrics.partitionsPerCounterBatch.getSnapshot());
  
          ClientWarn.instance.warn(String.format("The \"%s\" virtual table is deprecated. " +
                                                 "Please, use either \"%s.batch_group\", or \"%s.type_histogram\" " +
                                                 "virtual tables instead.",
                                                 TABLE_NAME, metadata.keyspace, metadata.keyspace));
          return result;
      }
  
      private void addRow(SimpleDataSet dataSet, String name, Snapshot snapshot)
      {
          dataSet.row(name)
                 .column(P50, snapshot.getMedian())
                 .column(P99, snapshot.get99thPercentile())
                 .column(P999, snapshot.get999thPercentile())
                 .column(MAX, snapshot.getMax());
      }
  }
  