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/*
 * Copyright 1999-2011 Alibaba Group.
 *  
 * Licensed 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 com.alibaba.dubbo.remoting.p2p;

import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.remoting.ChannelHandler;
import com.alibaba.dubbo.remoting.RemotingException;

/**
 * Group. (SPI, Prototype, ThreadSafe)
 * 
 * Peer-to-peer
 * 
 * @author william.liangf
 */
public interface Group {

    /**
     * get group url.
     * 
     * @return group url.
     */
    URL getUrl();

    /**
     * join.
     * 
     * @param url
     */
    Peer join(URL url, ChannelHandler handler) throws RemotingException;
    
    /**
     * leave.
     * 
     * @param url
     * @throws RemotingException
     */
    void leave(URL url) throws RemotingException;
    
    /**
     * close the group.
     */
    void close();

}