org.apache.curator.ensemble.exhibitor.Exhibitors Maven / Gradle / Ivy
/**
* 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.curator.ensemble.exhibitor;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import java.util.Collection;
/**
* POJO for specifying the cluster of Exhibitor instances
*/
public class Exhibitors
{
private final Collection hostnames;
private final int restPort;
private final BackupConnectionStringProvider backupConnectionStringProvider;
public interface BackupConnectionStringProvider
{
public String getBackupConnectionString() throws Exception;
}
/**
* @param hostnames set of Exhibitor instance host names
* @param restPort the REST port used to connect to Exhibitor
* @param backupConnectionStringProvider in case an Exhibitor instance can't be contacted, returns the fixed
* connection string to use as a backup
*/
public Exhibitors(Collection hostnames, int restPort, BackupConnectionStringProvider backupConnectionStringProvider)
{
this.backupConnectionStringProvider = Preconditions.checkNotNull(backupConnectionStringProvider, "backupConnectionStringProvider cannot be null");
this.hostnames = ImmutableList.copyOf(hostnames);
this.restPort = restPort;
}
public Collection getHostnames()
{
return hostnames;
}
public int getRestPort()
{
return restPort;
}
public String getBackupConnectionString() throws Exception
{
return backupConnectionStringProvider.getBackupConnectionString();
}
}