Even though Alex's solution works, I don't believe in including 2 additional dependencies (Actuator
and Cloud Context
) just to be able to do one operation. Instead, I have combined his answer and modified my code in order to do what I wanted.
So, first of all, it is crucial that the code is executed using new Thread()
and setDaemon(false);
. I have the following endpoint method that handles the restart:
val restartThread = Thread {
logger.info("Restarting...")
Thread.sleep(1000)
SpringMain.restartToMode(AppMode.valueOf(change.newMode.toUpperCase()))
logger.info("Restarting... Done.")
}
restartThread.isDaemon = false
restartThread.start()
The Thread.sleep(1000)
is not required, but I want my controller to output the view before actually restarting the application.
SpringMain.restartToMode
has the following:
@Synchronized fun restartToMode(mode: AppMode) {
requireNotNull(context)
requireNotNull(application)
// internal logic to potentially produce a new arguments array
// close previous context
context.close()
// and build new one using the new mode
val builder = SpringApplicationBuilder(SpringMain::class.java)
application = builder.application()
context = builder.build().run(*argsArray)
}
Where context
and application
come from the main
method upon starting the application:
val args = ArrayList<String>()
lateinit var context: ConfigurableApplicationContext
lateinit var application: SpringApplication
@Throws(Exception::class)
@JvmStatic fun main(args: Array<String>) {
this.args += args
val builder = SpringApplicationBuilder(SpringMain::class.java)
application = builder.application()
context = builder.build().run(*args)
}
I am not entirely sure if this produces any problems. If there will be, I will update this answer. Hopefully this will be of any help to others.
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