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From: chris derham <chris@derham.me.uk>
Date: Mon, 3 Jun 2013 07:42:01 -0300
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 <CAG6aRdUar4R6ZL5CsYvpZXGfti2nsoTrfavHEAWXBqQ=NmaTTA@mail.gmail.com>
Subject: Re: WebSockets Thread Safety question
To: Tomcat Users List <users@tomcat.apache.org>
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> When I use the syntax from the samples in the onTextMessage() method, I get
> ConcurrentModificationException if I have more than one client sending data
> to the server at the same time:
>
>             for(MyMessageInbound mmib: mmiList){
>                 CharBuffer buffer = CharBuffer.wrap(cb);
>                 mmib.myoutbound.writeTextMessage(buffer);
>                 mmib.myoutbound.flush();
>             }
>
>
> Changing it to the following works fine:
>
>             for(int i = 0; i < mmib.size(); i++) {
>                 MyMessageInbound mmib = mmiList.get(i);
>                 CharBuffer buffer = CharBuffer.wrap(cb);
>                 mmib.myoutbound.writeTextMessage(buffer);
>                 mmib.myoutbound.flush();
>             }
>
> However, this approach is not as efficient as to use an Iterator, unless I
> clone the mmiList Collection to iterate over it...

Can you explain where is the in-efficiency?

Thanks

Chris

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