Signal DSL

Purpose

POS master data updates over signal watchers, to execute a list of tasks (for now only import and/or export via datainterchange) depending on newly created files. This so called trigger-file will be deleted after the execution of all the tasks (or actions) weither they are be executed sequentially or parallel.

A client wishes to export a certain amount of data (sales, reports, master data...) on a specific working day (or not) at a certain time, either once or several time on this date. Therefore, it should now be possible to define such characteristic inside a model.

SignalDSL

The SingalDSL defines the java functions for Os.bee and the functions will be used in other Os.bee models. The main semantic elements of the SingalDSL are:

• package - The root element that contains all the other elements. (now in one file only one package could be defined, the grammar could be altered to support several packages in one file, if needed)
• import declarations - Used to import external models or other Java classes.
• watcher - define a watcher which monitors a directory.
• filemask - define a group of target files to watch and all detail about the watcher.
• filename - define a target file to watch and detail about the watcher.
• scheduler - define the simple or complex schedulers for executing tens, hundreds, or even tens-of-thousands of jobs.

package defintion

With the keyword package followed by a qualified name, you define the root element that contains all the other elements. A model can contain multiple packages.

► Syntax:

package <package name>[{ 
	(
	  watcher <watcher name>
		  filemask <file mask> . . .
		| filename <file name> . . .

	| scheduler <scheduler name> . . .
	)* 
}]

• one or more watcher/scheduler can be defined in the same package.
• 2 types of watcher can be defined, they are:
  • file mask watcher:

    We provide the possibility to set a file mask to extend the further specify (and identify) on a file name basis, the defined task will be executed when the matched files creations occur in the monitored directory.

  • file name watcher:

    A specified file name can be defined as the target file, and a list of tasks will be executed when the matched file creation occurs in the monitored directory.

Watcher

Watcher jobs are generated by a watcher, they will be stored into a queue and processed by the watcher job handler.

► Syntax:

watcher <watcher name>
	filemask <file mask>
		sequential | parallel
		from <DataInterchange Group>
	{
		import|export <DataInterchange Unit> [applyon]
	}

	| 
	filename <file name>
		sequential | parallel
		from <DataInterchangeGroup>
	{
		(import|export <DataInterchange Unit> [applyon])*
	}

Scheduler

► Syntax:

scheduler <schedulername>
	  cron <expressionSTRING> 
	| hourlyat <minuteINT>
	| dailyat <hourINT> : <minuteINT>
	| weeklyon DayOfWeekEnum at <hourINT> : <minuteINT>
	| monthlyon <dayofmonthINT> at <hourINT> : <minuteINT>
	[sequential|parallel]
	from <data:DataInterchange Group>
{
	(import|export <data:DataInterchange Unit> [applyon])*
}

• DayOfWeekEnum is including sunday, monday, tuesday, wednesday, thursday, friday and saturday.

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