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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 static org.apache.commons.lang3.StringUtils.EMPTY;
import io.airlift.command.Arguments;
import io.airlift.command.Command;

import java.io.IOException;
import java.io.PrintStream;

import org.apache.cassandra.tools.NodeProbe;
import org.apache.cassandra.tools.NodeTool.NodeToolCmd;

@Command(name = "describering", description = "Shows the token ranges info of a given keyspace")
public class DescribeRing extends NodeToolCmd
{
    @Arguments(description = "The keyspace name", required = true)
    String keyspace = EMPTY;

    @Override
    public void execute(NodeProbe probe)
    {
        PrintStream out = probe.output().out;
        out.println("Schema Version:" + probe.getSchemaVersion());
        out.println("TokenRange: ");
        try
        {
            for (String tokenRangeString : probe.describeRing(keyspace))
            {
                out.println("\t" + tokenRangeString);
            }
        } catch (IOException e)
        {
            throw new RuntimeException(e);
        }
    }
}