The Application Level Events (ALE) Specification, Version 1.0 - GS1
The Application Level Events (ALE) Specification, Version 1.0 - GS1
The Application Level Events (ALE) Specification, Version 1.0 - GS1
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8.2.1 ECBoundarySpec<br />
An ECBoundarySpec specifies how the beginning and end of event cycles are to be<br />
determined.<br />
startTrigger : ECTrigger<br />
repeatPeriod : ECTime<br />
stopTrigger : ECTrigger<br />
duration : ECTime<br />
stableSetInterval : ECTime<br />
<br />
---<br />
<strong>The</strong> ECTime values duration, repeatPeriod, and stableSetInterval must<br />
be non-negative; otherwise, the define and immediate methods SHALL raise an<br />
ECSpecValidationException. Zero means “unspecified.”<br />
<strong>The</strong> startTrigger and stopTrigger parameters are optional. For each of these<br />
two parameters, if the parameter is null, omitted, or is an empty string it is considered<br />
“unspecified.”<br />
<strong>The</strong> startTrigger and repeatPeriod parameters are mutually exclusive. If<br />
startTrigger and repeatPeriod are both specified, then the define and<br />
immediate methods SHALL raise an ECSpecValidationException.<br />
<strong>The</strong> conditions under which an event cycle is started depends on the settings for<br />
startTrigger and repeatPeriod:<br />
• If startTrigger is specified and repeatPeriod is not specified, an event<br />
cycle is started when:<br />
• <strong>The</strong> ECSpec is in the requested state and the specified start trigger is received.<br />
• If startTrigger is not specified and repeatPeriod is specified, an event<br />
cycle is started when:<br />
• <strong>The</strong> ECSpec transitions from the unrequested state to the requested state; or<br />
• <strong>The</strong> repeatPeriod has elapsed from the start of the last event cycle, and in<br />
that interval the ECSpec has never transitioned to the unrequested state.<br />
• If neither startTrigger nor repeatPeriod are specified, an event cycle is<br />
started when:<br />
• <strong>The</strong> ECSpec transitions from the unrequested state to the requested state; or<br />
• Immediately after the previous event cycle, if the ECSpec is in the requested<br />
state.<br />
An event cycle, once started, extends until one of the following is true:<br />
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