DistributedServerGroup.java

package ragefist.core.distribution;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.naming.directory.InvalidAttributesException;

/*
 * Created by Andrey Cherkashin (acherkashin)
 * http://acherkashin.me
 * 
 * License
 * Copyright (c) 2015 Andrey Cherkashin
 * The project released under the MIT license: http://opensource.org/licenses/MIT
 */

/**
 *
 * @author acherkashin
 */
public class DistributedServerGroup
{
	private final ArrayList<DistributedServer> _servers;
	private final String _code;
	private final SelectionPolicy _selectionPolicy;
	
	public static class DistributedServerGroupBuilder
	{
		public ArrayList<DistributedServer> servers = new ArrayList<>();
		public String code;
		public SelectionPolicy selectionPolicy;
		
		public DistributedServerGroup build() throws InvalidAttributesException {
			if (code == null || code.isEmpty()) {
				throw new InvalidAttributesException("DistributedServerGroup.code is empty or null");
			}
			if (servers == null || servers.isEmpty()) {
				throw new InvalidAttributesException("DistributedServerGroup.servers is empty or null");
			}
			if (selectionPolicy == null) {
				throw new InvalidAttributesException("DistributedServerGroup.selectionPolicy is empty or null");
			}
			return new DistributedServerGroup(this);
		}
	}
	
	private DistributedServerGroup(DistributedServerGroupBuilder builder) {
		_servers = builder.servers;
		_code = builder.code;
		_selectionPolicy = builder.selectionPolicy;
	}
	
	// ---------------------------------------------------------------------- //
	// PUBLIC
	// ---------------------------------------------------------------------- //
	
	public final String getCode() { return _code; }
	public final List<DistributedServer> getServers() { return Collections.unmodifiableList(_servers); }
}