Startup DiskQuotaMonitor on context init, rather than immediatley aft…

…er bean properties are set

This makes spring initialization much easier and avoids risk of xml configuration not yet being available

geowebcache/diskquota/core/src/main/java/org/geowebcache/diskquota/DiskQuotaMonitor.java

@@ -37,7 +37,8 @@
 import org.geowebcache.storage.DefaultStorageFinder;
 import org.geowebcache.storage.StorageBroker;
 import org.springframework.beans.factory.DisposableBean;
-import org.springframework.beans.factory.InitializingBean;
+import org.springframework.context.ApplicationListener;
+import org.springframework.context.event.ContextRefreshedEvent;
 import org.springframework.scheduling.concurrent.CustomizableThreadFactory;
 import org.springframework.util.Assert;
 
@@ -52,7 +53,8 @@
  *
  * @author Gabriel Roldan
  */
-public class DiskQuotaMonitor implements InitializingBean, DisposableBean {
+public class DiskQuotaMonitor
+        implements DisposableBean, ApplicationListener<ContextRefreshedEvent> {
 
     private static final Logger log = Logging.getLogger(DiskQuotaMonitor.class.getName());
 
@@ -156,21 +158,21 @@ public boolean isRunning() {
         return isRunning;
     }
 
-    /**
-     * Called when the framework calls this bean for initialization
-     *
-     * <p>Defers to {@link #startUp()}, or does nothing if {@code isEnabled() == false}
-     *
-     * @see #isEnabled()
-     * @see #startUp()
-     * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
-     */
+    /** Startup monitor once application is initialized. */
     @Override
-    public void afterPropertiesSet() throws Exception {
+    public void onApplicationEvent(ContextRefreshedEvent event) {
         if (!diskQuotaEnabled) {
             return;
         }
-        startUp();
+        if (isRunning) {
+            // monitor may already be running if application is refreshed
+            return;
+        }
+        try {
+            startUp();
+        } catch (Exception unableToStart) {
+            log.log(Level.WARNING, "Unable to start disk quota monitor", unableToStart);
+        }
     }
 
     /**