J.0 Policy Example: Triggerless Future Event Processing

The following example assumes that a “commence” attribute exists and does the following:

<policy 	 xmlns:Timestamp="http://www.novell.com/nxsl/java/java.sql.Timestamp"
	xmlns:TimestampUtil="http://www.novell.com/nxsl/java/com.novell.nds.dirxml.driver.jdbc.db.TimestampUtil" 		
	xmlns:jdbc="urn:dirxml:jdbc">
<rule>
<description>Get commencement date from datasource.</description>
	<conditions>
		<and>
			<if-xpath op="true">.</if-xpath>
		</and>
	</conditions>
	<actions>
		<do-set-local-variable name="commence">
			<arg-string>
				<token-src-attr class-name="User" name="commence"/>
			</arg-string>
		</do-set-local-variable>
	</actions>
</rule>

<rule>
	<description>Break if commencement date unavailable.</description>
	<conditions>
		<and>
			<if-local-variable name="commence" op="equal"/>
		</and>
	</conditions>
	<actions>
		<do-break/>
	</actions>
</rule>

<rule>
<description>Parse times.</description>
	<conditions>
		<and>
			<if-xpath op="true">.</if-xpath>
		</and>
	</conditions>
	<actions>
		<do-set-local-variable name="dbTime">
			<arg-object>
				<token-xpath expression="Timestamp:valueOf(@jdbc:database-local-time)"/>
			</arg-object>
		</do-set-local-variable>
		<do-set-local-variable name="eventTime">
			<arg-object>
				<token-xpath expression="Timestamp:valueOf($commence)"/>
			</arg-object>
		</do-set-local-variable>
	</actions>
</rule><rule>
	<description>Is commencement date after database time?</description>
	<conditions>
		<and>
			<if-xpath op="true">.</if-xpath>
		</and>
	</conditions>
	<actions>
		<do-set-local-variable name="after">
			<arg-string>
				<token-xpath expression="TimestampUtil:after($eventTime, $dbTime)"/>
			</arg-string>
		</do-set-local-variable>
	</actions>
</rule>

<rule>
<description>Retry if future event.</description>
	<conditions>
		<and>
			<if-local-variable name="after" op="equal">true</if-local-variable>
		</and>
	</conditions>
	<actions>
		<do-status level="retry">
			<arg-string>
				<token-text xml:space="preserve">Future event detected.</token-text>
			</arg-string>
		</do-status>
	</actions>
</rule></policy>