Evaluating properties inside Spring Expression Lang (SpEL)

expression, java, properties, spring, spring-el

Solution

`"#{T(java.util.concurrent.TimeUnit).MINUTES.toMillis( @configurationProperties['garbageLevelWatcher.refreshIntervalMinutes'])}"`

EDIT:

Or...

<context:property-placeholder properties-ref="configurationProperties"
<util:constant id = "MINUTES" static-field="java.util.concurrent.TimeUnit.MINUTES" />

and

"#{@MINUTES.toMillis(${garbageLevelWatcher.refreshIntervalMinutes})}"

Problem

Our service has a process that is scheduled according to a properties file, reading the property refreshIntervalMillis. Its value is injected directly in a Quartz trigger with this configuration: ``` <bean name="trigger" class="org.springframework.scheduling.quartz.SimpleTriggerFactoryBean " p:repeatInterval="${refreshIntervalMillis}"> ... </bean> ``` However, the admins that install this service think in terms of hours/days, so in order to make thing easier for them, we changed this to: - Renamed refreshIntervalMillis to refreshIntervalMinutes - Changed to code above to the following: ``` p:repeatInterval="#{ 1000 * 60 * T(java.lang.Integer).valueOf(@configurationProperties['garbageLevelWatcher.refreshIntervalMinutes'])}" ``` Note: the properties object is exposed as a bean named "configurationProperties" Is there a simpler syntax to accomplish the same? Thanks,

Original source