dubbo-remoting-extensions/dubbo-remoting-p2p/src/main/java/org/apache/dubbo/remoting/p2p/exchange/support/AbstractExchangeGroup.java [101:111]:
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    @Override
    public void leave(URL url) throws RemotingException {
        RemotingServer server = servers.remove(url);
        if (server != null) {
            server.close();
        }
    }

    protected Client connect(URL url) throws RemotingException {
        if (servers.containsKey(url)) {
            return null;
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dubbo-remoting-extensions/dubbo-remoting-p2p/src/main/java/org/apache/dubbo/remoting/p2p/support/AbstractGroup.java [92:102]:
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    @Override
    public void leave(URL url) throws RemotingException {
        RemotingServer server = servers.remove(url);
        if (server != null) {
            server.close();
        }
    }

    protected Client connect(URL url) throws RemotingException {
        if (servers.containsKey(url)) {
            return null;
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