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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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/*
 * 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.tools.nodetool.stats;

import java.util.ArrayList;
import java.util.List;

import org.apache.cassandra.db.ColumnFamilyStoreMBean;
import org.apache.cassandra.metrics.CassandraMetricsRegistry;
import org.apache.cassandra.tools.NodeProbe;

public class StatsKeyspace
{
    public List tables = new ArrayList<>();
    private final NodeProbe probe;

    public String name;
    public long readCount;
    public long writeCount;
    public int pendingFlushes;
    private double totalReadTime;
    private double totalWriteTime;

    public StatsKeyspace(NodeProbe probe, String keyspaceName)
    {
        this.probe = probe;
        this.name = keyspaceName;
    }

    public void add(ColumnFamilyStoreMBean table)
    {
        String tableName = table.getTableName();
        long tableWriteCount = ((CassandraMetricsRegistry.JmxTimerMBean) probe.getColumnFamilyMetric(name, tableName, "WriteLatency")).getCount();
        long tableReadCount = ((CassandraMetricsRegistry.JmxTimerMBean) probe.getColumnFamilyMetric(name, tableName, "ReadLatency")).getCount();

        if (tableReadCount > 0)
        {
            readCount += tableReadCount;
            totalReadTime += (long) probe.getColumnFamilyMetric(name, tableName, "ReadTotalLatency");
        }
        if (tableWriteCount > 0)
        {
            writeCount += tableWriteCount;
            totalWriteTime += (long) probe.getColumnFamilyMetric(name, tableName, "WriteTotalLatency");
        }
        pendingFlushes += (long) probe.getColumnFamilyMetric(name, tableName, "PendingFlushes");
    }

    public double readLatency()
    {
        return readCount > 0
               ? totalReadTime / readCount / 1000
               : Double.NaN;
    }

    public double writeLatency()
    {
        return writeCount > 0
               ? totalWriteTime / writeCount / 1000
               : Double.NaN;
    }
}