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.walker;
  
  import org.apache.cassandra.db.virtual.model.Column;
  import org.apache.cassandra.db.virtual.model.TimerMetricRow;
  
  /**
   * The {@link org.apache.cassandra.db.virtual.model.TimerMetricRow} row metadata and data walker.
   *
   * @see org.apache.cassandra.db.virtual.model.TimerMetricRow
   */
  public class TimerMetricRowWalker implements RowWalker<TimerMetricRow>
  {
      // Note: max & min are defined as doubles here despite Timer itself exposing them as longs,
      // via its histogram's snapshot. This is because historically, JMXTimerMBean defined these
      // fields as doubles and the vtable representation should be consistent with that.
      @Override
      public void visitMeta(MetadataVisitor visitor)
      {
          visitor.accept(Column.Type.PARTITION_KEY, "name", String.class);
          visitor.accept(Column.Type.REGULAR, "max", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "mean", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "min", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "p75th", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "p95th", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "p98th", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "p999th", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "p99th", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "count", Long.TYPE);
          visitor.accept(Column.Type.REGULAR, "fifteen_minute_rate", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "five_minute_rate", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "mean_rate", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "one_minute_rate", Double.TYPE);
          visitor.accept(Column.Type.REGULAR, "scope", String.class);
      }
  
      @Override
      public void visitRow(TimerMetricRow row, RowMetadataVisitor visitor)
      {
          visitor.accept(Column.Type.PARTITION_KEY, "name", String.class, row::name);
          visitor.accept(Column.Type.REGULAR, "max", Double.TYPE, row::max);
          visitor.accept(Column.Type.REGULAR, "mean", Double.TYPE, row::mean);
          visitor.accept(Column.Type.REGULAR, "min", Double.TYPE, row::min);
          visitor.accept(Column.Type.REGULAR, "p75th", Double.TYPE, row::p75th);
          visitor.accept(Column.Type.REGULAR, "p95th", Double.TYPE, row::p95th);
          visitor.accept(Column.Type.REGULAR, "p98th", Double.TYPE, row::p98th);
          visitor.accept(Column.Type.REGULAR, "p999th", Double.TYPE, row::p999th);
          visitor.accept(Column.Type.REGULAR, "p99th", Double.TYPE, row::p99th);
          visitor.accept(Column.Type.REGULAR, "count", Long.TYPE, row::count);
          visitor.accept(Column.Type.REGULAR, "fifteen_minute_rate", Double.TYPE, row::fifteenMinuteRate);
          visitor.accept(Column.Type.REGULAR, "five_minute_rate", Double.TYPE, row::fiveMinuteRate);
          visitor.accept(Column.Type.REGULAR, "mean_rate", Double.TYPE, row::meanRate);
          visitor.accept(Column.Type.REGULAR, "one_minute_rate", Double.TYPE, row::oneMinuteRate);
          visitor.accept(Column.Type.REGULAR, "scope", String.class, row::scope);
      }
  
      @Override
      public int count(Column.Type type)
      {
          switch (type)
          {
              case PARTITION_KEY:
                  return 1;
              case CLUSTERING:
                  return 0;
              case REGULAR:
                  return 14;
              default:
                  throw new IllegalStateException("Unknown column type: " + type);
          }
      }
  }
  