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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.
/*
* 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,
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* See the License for the specific language governing permissions and
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*/
package org.apache.cassandra.locator;
import org.apache.cassandra.utils.Pair;
import static java.lang.String.format;
public class SnitchUtils
{
private SnitchUtils() {}
static Pair parseDcAndRack(String response, String dcSuffix)
{
String[] splits = response.split("/");
String az = splits[splits.length - 1];
splits = az.split("-");
String localRack = splits[splits.length - 1];
int lastRegionIndex = az.lastIndexOf('-');
// we would hit StringIndexOutOfBoundsException on the az.substring method if we did not do this
if (lastRegionIndex == -1)
throw new IllegalStateException(format("%s does not contain at least one '-' to differentiate " +
"between datacenter and rack", response));
String localDc = az.substring(0, lastRegionIndex);
localDc = localDc.concat(dcSuffix);
return Pair.create(localDc, localRack);
}
}