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copied!<p>This is a sketch of an approach that improves fairness - it will mean that <em>all</em> <code>B</code>-sends are subject to a delay of up to 100ms. I don't know however if it fits with your constraints.</p> <ul> <li>In a global context, have a single <code>MessageSender</code> object of type <code>IMessageSender</code></li> <li>There are two implementations of <code>IMessageSender</code>, namely <code>DefaultMessageSender</code>, and <code>BWrappingMessageSender</code> (which stores a <code>b</code> value)</li> </ul> <p>The message senders behaviour is as follows:</p> <ul> <li><code>DefaultMessageSender</code> on being asked to send an <code>A</code>: just sends it</li> <li><p><code>DefaultMessageSender</code> on being asked to send an <code>B</code>: switches the global <code>MessageSender</code> to being a new <code>BWrappingMessageSender</code> which knows the just-passed value <code>b</code></p></li> <li><p><code>BWrappingMessageSender</code> on being asked to send an <code>A</code>: sends an AB with the passed <code>a</code> and its own <code>b</code>, and switches the global <code>MessageSender</code> to being a <code>DefaultMessageSender</code></p></li> <li><code>BWrappingMessageSender</code> on being asked to send a <code>B</code>: sends a <code>B</code> with its own <code>b</code>, and switches the global <code>MessageSender</code> to being a new <code>BWrappingMessageSender</code> which knows the just-passed value <code>b</code></li> </ul> <p>What I haven't pinned down is a way that a newly-created <code>BWrappingMessageSender</code> knows to send a plain <code>B</code> 100ms after being created, if it hasn't in that time been told to do anything else.</p>

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