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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;

import java.util.*;
import io.airlift.command.Arguments;
import io.airlift.command.Command;
import io.airlift.command.Option;

import org.apache.cassandra.tools.NodeProbe;
import org.apache.cassandra.tools.NodeTool.NodeToolCmd;
import org.apache.cassandra.tools.nodetool.stats.*;

@Command(name = "tablestats", description = "Print statistics on tables")
public class TableStats extends NodeToolCmd
{
    @Arguments(usage = "[...]", description = "List of tables (or keyspace) names")
    private List tableNames = new ArrayList<>();

    @Option(name = "-i", description = "Ignore the list of tables and display the remaining tables")
    private boolean ignore = false;

    @Option(title = "human_readable",
            name = {"-H", "--human-readable"},
            description = "Display bytes in human readable form, i.e. KiB, MiB, GiB, TiB")
    private boolean humanReadable = false;

    @Option(title = "format",
            name = {"-F", "--format"},
            description = "Output format (json, yaml)")
    private String outputFormat = "";

    @Override
    public void execute(NodeProbe probe)
    {
        if (!outputFormat.isEmpty() && !"json".equals(outputFormat) && !"yaml".equals(outputFormat))
        {
            throw new IllegalArgumentException("arguments for -F are json,yaml only.");
        }

        StatsHolder holder = new TableStatsHolder(probe, humanReadable, ignore, tableNames);
        // print out the keyspace and table statistics
        StatsPrinter printer = TableStatsPrinter.from(outputFormat);
        printer.print(holder, probe.output().out);
    }

}