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-<h1 class="whs1">Directing dataflow between \r
- nodes</h1>\r
-\r
-<p><span style="font-weight: bold;"><B><img src="../i_blue.jpg" x-maintain-ratio="TRUE" width="30px" height="30px" border="0" class="img_whs2">SUPERVISION</B></span> component \r
- automatically defines for each node two special ports an <span style="font-weight: bold;"><B>Input \r
- Gate</B></span> and \r
- an <span style="font-weight: bold;"><B>Output Gate</B></span>. They are managed \r
- by SUPERVISION \r
- and are not arguments of services of nodes.</p>\r
-\r
-<p class="whs3">Sometimes the flow of \r
- data in a graph allow parallel execution of nodes ; but the implementation \r
- of the services of these nodes does not allow parallel execution ( services \r
- which are not thread-safe, internal dependencies, etc\85 ). These ports \r
- give the \r
- possibility to solve such problems. </p>\r
-\r
-<p class="whs3"> </p>\r
-\r
-<ul type="disc" class="whs4">\r
- \r
- <li class=kadov-p><p class="whs3">If \r
- there is no link on a Gate, the Gate is ignored at execution time.</p></li>\r
-</ul>\r
-\r
-<p class="whs3"> </p>\r
-\r
-<ul type="disc" class="whs4">\r
- \r
- <li class=kadov-p><p class="whs3">The \r
- internal type of these ports are boolean.</p></li>\r
-</ul>\r
-\r
-<p class="whs3"> </p>\r
-\r
-<ul type="disc" class="whs4">\r
- \r
- <li class=kadov-p><p class="whs3"> If \r
- there is a link from an output Gate of a node to an Input Gate, the node \r
- of the input Gate will be executed after the other node.</p></li>\r
-</ul>\r
-\r
-<p class="whs3"> </p>\r
-\r
-<ul type="disc" class="whs4">\r
- \r
- <li class=kadov-p><p class="whs3"> If \r
- an output port of a switch node is connected to an input gate, the node \r
- of the input gate will be executed only if the value of the output port \r
- is \93<span style="font-weight: bold;"><B>True</B></span>\94.</p></li>\r
-</ul>\r
-\r
-<p class="whs3"> </p>\r
-\r
-<ul type="disc" class="whs4">\r
- \r
- <li class=kadov-p><p class="whs3"> But \r
- an output gate may not be connected with a link to an input port.</p></li>\r
-</ul>\r
-\r
-<p class="whs3"> </p>\r
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