"infinite Loop and break"

xmarceks

How can I model a infitity loop that breaks in a specific situation. A macro is set at value etc. stop=0

Skirzynski

Tricky one! Unfortunately the "Loop until" operator is not capable of defining a condition based on a macro (I will create a ticket for this one). You can work around this by misusing the exception operators. Wrap your loop inside a "Handle Exception" operator, use "Loop" with MAX_INTEGER iterations and place a branch operator inside which will throw an exception on a particular macro value. See example process below:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.009">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.3.009" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="handle_exception" compatibility="5.3.009" expanded="true" height="76" name="Handle Exception" width="90" x="112" y="30">
        <process expanded="true">
          <operator activated="true" class="loop" compatibility="5.3.009" expanded="true" height="76" name="Loop" width="90" x="112" y="30">
            <parameter key="set_iteration_macro" value="true"/>
            <parameter key="iterations" value="2147483647"/>
            <process expanded="true">
              <operator activated="true" class="print_to_console" compatibility="5.3.009" expanded="true" height="76" name="Print to Console" width="90" x="112" y="30">
                <parameter key="log_value" value="%{iteration}"/>
              </operator>
              <operator activated="true" class="branch" compatibility="5.3.009" expanded="true" height="76" name="Branch" width="90" x="407" y="30">
                <parameter key="condition_type" value="expression"/>
                <parameter key="condition_value" value="%{iteration}&gt;10"/>
                <process expanded="true">
                  <operator activated="true" class="throw_exception" compatibility="5.3.009" expanded="true" height="76" name="Throw Exception" width="90" x="168" y="30">
                    <parameter key="message" value="%{iteration} &gt; 10"/>
                  </operator>
                  <connect from_port="condition" to_op="Throw Exception" to_port="through 1"/>
                  <connect from_op="Throw Exception" from_port="through 1" to_port="input 1"/>
                  <portSpacing port="source_condition" spacing="0"/>
                  <portSpacing port="source_input 1" spacing="0"/>
                  <portSpacing port="sink_input 1" spacing="0"/>
                  <portSpacing port="sink_input 2" spacing="0"/>
                </process>
                <process expanded="true">
                  <portSpacing port="source_condition" spacing="0"/>
                  <portSpacing port="source_input 1" spacing="0"/>
                  <portSpacing port="sink_input 1" spacing="0"/>
                  <portSpacing port="sink_input 2" spacing="0"/>
                </process>
              </operator>
              <connect from_port="input 1" to_op="Print to Console" to_port="through 1"/>
              <connect from_op="Print to Console" from_port="through 1" to_op="Branch" to_port="condition"/>
              <connect from_op="Branch" from_port="input 1" to_port="output 1"/>
              <portSpacing port="source_input 1" spacing="0"/>
              <portSpacing port="source_input 2" spacing="0"/>
              <portSpacing port="sink_output 1" spacing="0"/>
              <portSpacing port="sink_output 2" spacing="0"/>
            </process>
          </operator>
          <connect from_port="in 1" to_op="Loop" to_port="input 1"/>
          <connect from_op="Loop" from_port="output 1" to_port="out 1"/>
          <portSpacing port="source_in 1" spacing="0"/>
          <portSpacing port="source_in 2" spacing="0"/>
          <portSpacing port="sink_out 1" spacing="0"/>
          <portSpacing port="sink_out 2" spacing="0"/>
        </process>
        <process expanded="true">
          <connect from_port="in 1" to_port="out 1"/>
          <portSpacing port="source_in 1" spacing="0"/>
          <portSpacing port="source_in 2" spacing="0"/>
          <portSpacing port="sink_out 1" spacing="0"/>
          <portSpacing port="sink_out 2" spacing="0"/>
        </process>
      </operator>
      <connect from_port="input 1" to_op="Handle Exception" to_port="in 1"/>
      <connect from_op="Handle Exception" from_port="out 1" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="source_input 2" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>