/*
* 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.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.cassandra.config.Config;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.config.SeedProviderDef;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.yaml.snakeyaml.Loader;
import org.yaml.snakeyaml.TypeDescription;
import org.yaml.snakeyaml.Yaml;
public class SimpleSeedProvider implements SeedProvider
{
private static final Logger logger = LoggerFactory.getLogger(SimpleSeedProvider.class);
List<InetAddress> seeds;
public SimpleSeedProvider(Map<String, String> args) {
try
{
seeds = loadSeeds();
}
catch (Exception e)
{
throw new AssertionError(e);
}
}
public List<InetAddress> getSeeds()
{
try
{
seeds = loadSeeds();
}
catch (Exception e)
{
logger.warn("Could not refresh seeds from configuration file: {}", e);
}
return Collections.unmodifiableList(seeds);
}
private List<InetAddress> loadSeeds() throws IOException, ConfigurationException
{
Config conf = DatabaseDescriptor.loadConfig();
String[] hosts = conf.seed_provider.parameters.get("seeds").split(",", -1);
List<InetAddress> seeds = new ArrayList<InetAddress>(hosts.length);
for (String host : hosts)
{
try
{
seeds.add(InetAddress.getByName(host.trim()));
}
catch (UnknownHostException ex)
{
// not fatal... DD will bark if there end up being zero seeds.
logger.warn("Seed provider couldn't lookup host {}", host);
}
}
return seeds;
}
}