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.google.common.annotations.VisibleForTesting;
  
  import org.apache.cassandra.cql3.QueryProcessor;
  import org.apache.cassandra.db.marshal.DoubleType;
  import org.apache.cassandra.db.marshal.UTF8Type;
  import org.apache.cassandra.dht.LocalPartitioner;
  import org.apache.cassandra.metrics.CQLMetrics;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.service.ClientWarn;
  
  /**
   * @deprecated The "cql_metrics" virtual table is no longer used, and will be removed in a future release. Please,
   * use "system_metrics.cql_group" virtual table instead.
   */
  @Deprecated(since = "5.1")
  final class CQLMetricsTable extends AbstractVirtualTable
  {
      public static final String TABLE_NAME = "cql_metrics";
      public static final String PREPARED_STATEMENTS_COUNT = "prepared_statements_count";
      public static final String PREPARED_STATEMENTS_EVICTED = "prepared_statements_evicted";
      public static final String PREPARED_STATEMENTS_EXECUTED = "prepared_statements_executed";
      public static final String PREPARED_STATEMENTS_RATIO = "prepared_statements_ratio";
      public static final String REGULAR_STATEMENTS_EXECUTED = "regular_statements_executed";
      public static final String NAME_COL = "name";
      public static final String VALUE_COL = "value";
  
      private final CQLMetrics cqlMetrics;
  
      CQLMetricsTable(String keyspace)
      {
          this(keyspace, QueryProcessor.metrics);
      }
  
      // For dependency injection
      @VisibleForTesting
      CQLMetricsTable(String keyspace, CQLMetrics cqlMetrics)
      {
          super(TableMetadata.builder(keyspace, TABLE_NAME)
                             .comment("Metrics specific to CQL prepared statement caching")
                             .kind(TableMetadata.Kind.VIRTUAL)
                             .partitioner(new LocalPartitioner(UTF8Type.instance))
                             .addPartitionKeyColumn(NAME_COL, UTF8Type.instance)
                             .addRegularColumn(VALUE_COL, DoubleType.instance)
                             .build());
          this.cqlMetrics = cqlMetrics;
      }
  
      @Override
      public DataSet data()
      {
          SimpleDataSet result = new SimpleDataSet(metadata());
          addRow(result, PREPARED_STATEMENTS_COUNT, cqlMetrics.preparedStatementsCount.getValue());
          addRow(result, PREPARED_STATEMENTS_EVICTED, cqlMetrics.preparedStatementsEvicted.getCount());
          addRow(result, PREPARED_STATEMENTS_EXECUTED, cqlMetrics.preparedStatementsExecuted.getCount());
          addRow(result, PREPARED_STATEMENTS_RATIO, cqlMetrics.preparedStatementsRatio.getValue());
          addRow(result, REGULAR_STATEMENTS_EXECUTED, cqlMetrics.regularStatementsExecuted.getCount());
  
          ClientWarn.instance.warn("The \"" + TABLE_NAME + "\" virtual table is deprecated. " +
                                   "Please, use \"system_metrics.cql_group\" virtual table instead.");
          return result;
      }
  
      private void addRow(SimpleDataSet dataSet, String name, double value)
      {
          dataSet.row(name)
                 .column(VALUE_COL, value);
      }
  }
  