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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 java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.db.SystemKeyspace;
import org.apache.cassandra.gms.ApplicationState;
import org.apache.cassandra.gms.EndpointState;
import org.apache.cassandra.gms.Gossiper;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.Pair;
import static java.lang.String.format;
abstract class AbstractCloudMetadataServiceSnitch extends AbstractNetworkTopologySnitch
{
static final Logger logger = LoggerFactory.getLogger(AbstractCloudMetadataServiceSnitch.class);
static final String DEFAULT_DC = "UNKNOWN-DC";
static final String DEFAULT_RACK = "UNKNOWN-RACK";
protected final AbstractCloudMetadataServiceConnector connector;
private final String localRack;
private final String localDc;
private Map> savedEndpoints;
public AbstractCloudMetadataServiceSnitch(AbstractCloudMetadataServiceConnector connector, Pair dcAndRack)
{
this.connector = connector;
this.localDc = dcAndRack.left;
this.localRack = dcAndRack.right;
logger.info(format("%s using datacenter: %s, rack: %s, connector: %s, properties: %s",
getClass().getName(), getLocalDatacenter(), getLocalRack(), connector, connector.getProperties()));
}
@Override
public final String getLocalRack()
{
return localRack;
}
@Override
public final String getLocalDatacenter()
{
return localDc;
}
@Override
public final String getRack(InetAddressAndPort endpoint)
{
if (endpoint.equals(FBUtilities.getBroadcastAddressAndPort()))
return getLocalRack();
EndpointState state = Gossiper.instance.getEndpointStateForEndpoint(endpoint);
if (state == null || state.getApplicationState(ApplicationState.RACK) == null)
{
if (savedEndpoints == null)
savedEndpoints = SystemKeyspace.loadDcRackInfo();
if (savedEndpoints.containsKey(endpoint))
return savedEndpoints.get(endpoint).get("rack");
return DEFAULT_RACK;
}
return state.getApplicationState(ApplicationState.RACK).value;
}
@Override
public final String getDatacenter(InetAddressAndPort endpoint)
{
if (endpoint.equals(FBUtilities.getBroadcastAddressAndPort()))
return getLocalDatacenter();
EndpointState state = Gossiper.instance.getEndpointStateForEndpoint(endpoint);
if (state == null || state.getApplicationState(ApplicationState.DC) == null)
{
if (savedEndpoints == null)
savedEndpoints = SystemKeyspace.loadDcRackInfo();
if (savedEndpoints.containsKey(endpoint))
return savedEndpoints.get(endpoint).get("data_center");
return DEFAULT_DC;
}
return state.getApplicationState(ApplicationState.DC).value;
}
}
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