Engine Execution Rules (Magic xpa 4.x)
The following table summarizes the Magic xpa logic unit triggers, execution rules, and the order in which the logic units are executed in interactive tasks.
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Task Prefix
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A task is executed
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Record Prefix
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There is at least one record in the data view
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Task Suffix
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Record Prefix
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A record is fetched
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Control Prefix
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This is an Online task or Rich Client task
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Record Suffix
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Control Prefix
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The cursor parks on a control
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Control Verification
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No restrictions
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Control Verification
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Control editing is terminated or the cursor skips over the control
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Control Suffix
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No restrictions
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Control Suffix
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Control editing is terminated
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Variable Change
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The variable value is changed
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Record Suffix
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Variable Change
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A variable value is changed
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Record Suffix
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The record is about to be saved in an Online task or Rich Client task
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Task Suffix
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Record Suffix
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A record is about to be saved
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Task Suffix
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No restrictions
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Task Suffix
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A task is about to be terminated
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The above table demonstrates only one execution cycle for each logic unit. If the record or the control cycle is not terminated, that cycle will be repeated (from its Prefix logic unit to its Suffix logic unit).
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A Control logic unit can only be executed inside a Record logic unit cycle, and a Record logic unit can only be executed inside a Task logic unit.
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A parent logic unit cannot be terminated unless its sub-logic unit is terminated.
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For more detailed explanations about each part in this process, see:
Task Initialization
Record Processing
Task Termination
Engine Execution Rules - Batch
