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<scxml datamodel="ecmascript" name="postpone">
<script src="http://uscxml.tk.informatik.tu-darmstadt.de/scripts/dump.js" />
<script>
var blocked = true;
</script>
<state id="idle">
<!-- request will be postponed until someone unblocks -->
<transition event="http" target="idle" cond="_event.data.pathComponent[1] == 'block'">
<if cond="blocked">
<log expr="'Postponing'" />
<postpone until="blocked == false;" />
<else>
<response status="200" requestexpr="_event.origin">
<content expr="blocked" />
</response>
</else>
</if>
</transition>
<!-- unblock - this triggers all postponed events -->
<transition event="http" target="idle" cond="_event.data.pathComponent[1] == 'unblock'">
<log expr="'Unblocking'" />
<script>blocked = false;</script>
<response status="200" requestexpr="_event.origin">
<content expr="blocked" />
</response>
</transition>
<!-- default -->
<transition event="http" target="idle" cond="
_event.data.pathComponent[1] != 'unblock' &&
_event.data.pathComponent[1] != 'block'
">
<script>dump(_event);</script>
<response status="200" requestexpr="_event.origin" />
</transition>
</state>
<state id="final" final="true" />
</scxml>
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