Active object

<p>The active object <a href="/facts/Software_design_pattern/mV7r4egw">design pattern</a> decouples method execution from method invocation for objects that each reside in their own <a href="/facts/Thread_(computing)/hh8WHyPd">thread</a> of control. The goal is to introduce <a href="/facts/Concurrency_(computer_science)/Ctnrrq4A">concurrency</a>, by using <a href="/facts/Asynchronous_method_invocation/TEq7UXQg">asynchronous method invocation</a> and a <a href="/facts/Scheduling_(computing)/XptmcM1a">scheduler</a> for handling requests.
</p><p>The pattern consists of six elements:
</p>
<ul><li>A <a href="/facts/Proxy_pattern/CHHyzXbd">proxy</a>, which provides an interface towards clients with publicly accessible methods.</li>
<li>An interface which defines the method request on an active object.</li>
<li>A list of pending requests from clients.</li>
<li>A <a href="/facts/Scheduling_(computing)/XptmcM1a">scheduler</a>, which decides which request to execute next.</li>
<li>The implementation of the active object method.</li>
<li>A <a href="/facts/Callback_(computer_science)/vPlrCJXG">callback</a> or <a href="/facts/Variable_(computer_science)/VoCKtwml">variable</a> for the client to receive the result.</li></ul>

Active object open-in-new

Active object