BusyWaitTest.groovy

/**
 * Busywait Test
 *
 *  Author: Terry Gauchat
 *  Date: 2014-04-11
 */

definition(
    name: "BusyWait Test",
    namespace: "CosmicPuppy",
    author: "Terry Gauchat",
    description: "BusyWait Test v0.001",
    category: "My Apps",
    iconUrl: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience.png",
    iconX2Url: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience%402x.png",
    iconX3Url: "https://s3.amazonaws.com/smartapp-icons/Convenience/Cat-Convenience%402x.png"
)

preferences {
    section("Preferences"){
        input "mySwitch", "capability.switch", title: "Switch to flash:", required: true, multiple: true
        input "pauseMillis", "number", title: "Pause duration in Milliseconds:", required: true
    }
}

def installed() {
    subscribe(app, appTouch)
    log.debug "Installed with settings: ${settings}"
}

def updated() {
    unsubscribe()
    subscribe(app, appTouch)
    log.debug "Updated with settings: ${settings}"
}

def appTouch(evt) {
    log.debug "appTouch with Event: $evt"

    switchesOff()
    pause( pauseMillis )
    switchesOn()
    pause( pauseMillis )
    switchesOff()
    pause( pauseMillis )
    switchesOn()

    log.debug "Exec complete."
}

def pause(millis) {
   def passed = 0
   def now = new Date().time
   log.debug "pausing... at Now: $now"
   /* This loop is an impolite busywait. We need to be given a true sleep() method, please. */
   while ( passed < millis ) {
       passed = new Date().time - now
   }
   log.debug "... DONE pausing."
}

def switchesOn() {
   mySwitch.on()
   def t = new Date()
   log.debug "ON at time $t"
}

def switchesOff() {
   mySwitch.off()
   def t = new Date()
   log.debug "OFF at time $t"
}

/* =========== */
/* End of File */
/* =========== */