/**
* 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.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import org.apache.log4j.Logger;
/**
* PropertyFileEndPointSnitch
* <p/>
* PropertyFileEndPointSnitch is used by Digg to determine if two IP's are in the same
* datacenter or on the same rack.
*/
public class PropertyFileEndPointSnitch extends EndPointSnitch implements PropertyFileEndPointSnitchMBean
{
/**
* The default rack property file to be read.
*/
private static String DEFAULT_RACK_PROPERTY_FILE = "/etc/cassandra/rack.properties";
/**
* Whether to use the parent for detection of same node
*/
private boolean runInBaseMode = false;
/**
* Reference to the logger.
*/
private static Logger logger_ = Logger.getLogger(PropertyFileEndPointSnitch.class);
private static Map<InetAddress, String[]> endpointMap = new HashMap<InetAddress, String[]>();
private static String[] defaultDCRack;
public PropertyFileEndPointSnitch() throws IOException
{
try {
reloadConfiguration();
try {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
mbs.registerMBean(this, new ObjectName(MBEAN_OBJECT_NAME));
} catch (Exception e) {
throw new RuntimeException(e);
}
} catch (RuntimeException e) {
logger_.error("Failed to load toplogy", e);
throw e;
}
}
/**
* Get the raw information about an end point
*
* @param endPoint endPoint to process
* @return a array of string with the first index being the data center and the second being the rack
*/
public String[] getEndPointInfo(InetAddress endPoint)
{
String[] value = endpointMap.get(endPoint);
if (value == null)
{
if (logger_.isDebugEnabled())
logger_.debug("Could not find end point information for " + endPoint + ", will use default.");
return defaultDCRack;
}
return value;
}
/**
* Return the data center for which an endpoint resides in
*
* @param endPoint the endPoint to process
* @return string of data center
*/
public String getDataCenterForEndPoint(InetAddress endPoint)
{
return getEndPointInfo(endPoint)[0];
}
public String getLocation(InetAddress endPoint)
{
return getEndPointInfo(endPoint)[0];
}
/**
* Return the rack for which an endpoint resides in
*
* @param endPoint the endPoint to process
* @return string of rack
*/
public String getRackForEndPoint(InetAddress endPoint)
{
return getEndPointInfo(endPoint)[1];
}
@Override
public boolean isInSameDataCenter(InetAddress host, InetAddress host2) throws UnknownHostException
{
if (runInBaseMode)
return super.isInSameDataCenter(host, host2);
return getDataCenterForEndPoint(host).equals(getDataCenterForEndPoint(host2));
}
@Override
public boolean isOnSameRack(InetAddress host, InetAddress host2) throws UnknownHostException
{
if (runInBaseMode)
return super.isOnSameRack(host, host2);
if (!isInSameDataCenter(host, host2))
return false;
return getRackForEndPoint(host).equals(getRackForEndPoint(host2));
}
public String displayConfiguration()
{
StringBuffer configurationString = new StringBuffer("Current rack configuration\n=================\n");
for (Map.Entry<InetAddress, String[]> entry : endpointMap.entrySet())
{
String[] dcRack = entry.getValue();
configurationString.append(String.format("%s=%s:%s\n", entry.getKey(), dcRack[0], dcRack[1]));
}
return configurationString.toString();
}
public void reloadConfiguration() throws IOException
{
String rackPropertyFilename = System.getProperty("rackFile", DEFAULT_RACK_PROPERTY_FILE);
endpointMap.clear();
try
{
Properties properties = new Properties();
properties.load(new FileReader(rackPropertyFilename));
for (Map.Entry<Object, Object> entry : properties.entrySet())
{
String key = (String) entry.getKey();
String value = (String) entry.getValue();
if (key.equals("default"))
{
defaultDCRack = value.split(":");
if (defaultDCRack.length < 2)
defaultDCRack = new String[]{ "default", "default" };
}
else
{
InetAddress host = InetAddress.getByName(key.replace("/", ""));
String[] token = value.split(":");
if (token.length < 2)
token = new String[]{ "default", "default" };
endpointMap.put(host, token);
}
}
runInBaseMode = false;
}
catch (FileNotFoundException fnfe)
{
logger_.error("Could not find " + rackPropertyFilename + ", using default EndPointSnitch", fnfe);
runInBaseMode = true;
}
catch (IOException ioe)
{
logger_.error("Could not process " + rackPropertyFilename, ioe);
throw ioe;
}
}
}