/**
* 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.locator;
import java.net.InetAddress;
import java.util.Map;
import org.apache.cassandra.db.SystemTable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.gms.ApplicationState;
import org.apache.cassandra.gms.EndpointState;
import org.apache.cassandra.gms.Gossiper;
import org.apache.cassandra.utils.FBUtilities;
public class GossipingPropertyFileSnitch extends AbstractNetworkTopologySnitch
{
private static final Logger logger = LoggerFactory.getLogger(GossipingPropertyFileSnitch.class);
private PropertyFileSnitch psnitch;
private String myDC;
private String myRack;
private Map<InetAddress, Map<String, String>> savedEndpoints;
private String DEFAULT_DC = "UNKNOWN_DC";
private String DEFAULT_RACK = "UNKNOWN_RACK";
public GossipingPropertyFileSnitch() throws ConfigurationException
{
myDC = SnitchProperties.get("dc", null);
myRack = SnitchProperties.get("rack", null);
if (myDC == null || myRack == null)
throw new ConfigurationException("DC or rack not found in snitch properties");
myDC = myDC.trim();
myRack = myRack.trim();
try
{
psnitch = new PropertyFileSnitch();
logger.info("Loaded " + PropertyFileSnitch.SNITCH_PROPERTIES_FILENAME + " for compatibility");
}
catch (ConfigurationException e)
{
logger.info("Unable to load " + PropertyFileSnitch.SNITCH_PROPERTIES_FILENAME + "; compatibility mode disabled");
}
}
/**
* Return the data center for which an endpoint resides in
*
* @param endpoint the endpoint to process
* @return string of data center
*/
public String getDatacenter(InetAddress endpoint)
{
if (endpoint.equals(FBUtilities.getBroadcastAddress()))
return myDC;
EndpointState epState = Gossiper.instance.getEndpointStateForEndpoint(endpoint);
if (epState == null || epState.getApplicationState(ApplicationState.DC) == null)
{
if (psnitch == null)
{
if (savedEndpoints == null)
savedEndpoints = SystemTable.loadDcRackInfo();
if (savedEndpoints.containsKey(endpoint))
return savedEndpoints.get(endpoint).get("data_center");
return DEFAULT_DC;
}
else
return psnitch.getDatacenter(endpoint);
}
return epState.getApplicationState(ApplicationState.DC).value;
}
/**
* Return the rack for which an endpoint resides in
*
* @param endpoint the endpoint to process
* @return string of rack
*/
public String getRack(InetAddress endpoint)
{
if (endpoint.equals(FBUtilities.getBroadcastAddress()))
return myRack;
EndpointState epState = Gossiper.instance.getEndpointStateForEndpoint(endpoint);
if (epState == null || epState.getApplicationState(ApplicationState.RACK) == null)
{
if (psnitch == null)
{
if (savedEndpoints == null)
savedEndpoints = SystemTable.loadDcRackInfo();
if (savedEndpoints.containsKey(endpoint))
return savedEndpoints.get(endpoint).get("rack");
return DEFAULT_RACK;
}
else
return psnitch.getRack(endpoint);
}
return epState.getApplicationState(ApplicationState.RACK).value;
}
}