dubbo-remoting-extensions/dubbo-remoting-p2p/src/main/java/org/apache/dubbo/remoting/p2p/exchange/support/AbstractExchangeGroup.java [56:86]:
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        if (url == null) {
            throw new IllegalArgumentException("url == null");
        }
        this.url = url;
    }

    @Override
    public URL getUrl() {
        return url;
    }

    @Override
    public void close() {
        for (URL url : new ArrayList<URL>(servers.keySet())) {
            try {
                leave(url);
            } catch (Throwable t) {
                logger.error(t.getMessage(), t);
            }
        }
        for (URL url : new ArrayList<URL>(clients.keySet())) {
            try {
                disconnect(url);
            } catch (Throwable t) {
                logger.error(t.getMessage(), t);
            }
        }
    }

    @Override
    public Peer join(URL url, ChannelHandler handler) throws RemotingException {
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dubbo-remoting-extensions/dubbo-remoting-p2p/src/main/java/org/apache/dubbo/remoting/p2p/support/AbstractGroup.java [52:82]:
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        if (url == null) {
            throw new IllegalArgumentException("url == null");
        }
        this.url = url;
    }

    @Override
    public URL getUrl() {
        return url;
    }

    @Override
    public void close() {
        for (URL url : new ArrayList<URL>(servers.keySet())) {
            try {
                leave(url);
            } catch (Throwable t) {
                logger.error(t.getMessage(), t);
            }
        }
        for (URL url : new ArrayList<URL>(clients.keySet())) {
            try {
                disconnect(url);
            } catch (Throwable t) {
                logger.error(t.getMessage(), t);
            }
        }
    }

    @Override
    public Peer join(URL url, ChannelHandler handler) throws RemotingException {
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