51 lines
1.9 KiB
Java
51 lines
1.9 KiB
Java
|
package services;
|
||
|
|
|
||
|
|
import java.time.Clock;
|
||
|
|
import java.time.Instant;
|
||
|
|
import java.util.concurrent.CompletableFuture;
|
||
|
|
import javax.inject.*;
|
||
|
|
import play.Logger;
|
||
|
|
import play.inject.ApplicationLifecycle;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This class demonstrates how to run code when the
|
||
|
|
* application starts and stops. It starts a timer when the
|
||
|
|
* application starts. When the application stops it prints out how
|
||
|
|
* long the application was running for.
|
||
|
|
*
|
||
|
|
* This class is registered for Guice dependency injection in the
|
||
|
|
* {@link Module} class. We want the class to start when the application
|
||
|
|
* starts, so it is registered as an "eager singleton". See the code
|
||
|
|
* in the {@link Module} class to see how this happens.
|
||
|
|
*
|
||
|
|
* This class needs to run code when the server stops. It uses the
|
||
|
|
* application's {@link ApplicationLifecycle} to register a stop hook.
|
||
|
|
*/
|
||
|
|
@Singleton
|
||
|
|
public class ApplicationTimer {
|
||
|
|
|
||
|
|
private final Clock clock;
|
||
|
|
private final ApplicationLifecycle appLifecycle;
|
||
|
|
private final Instant start;
|
||
|
|
|
||
|
|
@Inject
|
||
|
|
public ApplicationTimer(Clock clock, ApplicationLifecycle appLifecycle) {
|
||
|
|
this.clock = clock;
|
||
|
|
this.appLifecycle = appLifecycle;
|
||
|
|
// This code is called when the application starts.
|
||
|
|
start = clock.instant();
|
||
|
|
Logger.info("ApplicationTimer demo: Starting application at " + start);
|
||
|
|
|
||
|
|
// When the application starts, register a stop hook with the
|
||
|
|
// ApplicationLifecycle object. The code inside the stop hook will
|
||
|
|
// be run when the application stops.
|
||
|
|
appLifecycle.addStopHook(() -> {
|
||
|
|
Instant stop = clock.instant();
|
||
|
|
Long runningTime = stop.getEpochSecond() - start.getEpochSecond();
|
||
|
|
Logger.info("ApplicationTimer demo: Stopping application at " + clock.instant() + " after " + runningTime + "s.");
|
||
|
|
return CompletableFuture.completedFuture(null);
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|