Polish DatabaseStartupValidator

(cherry picked from commit 8f21cb1)

Author: izeye

spring-jdbc/src/main/java/org/springframework/jdbc/support/DatabaseStartupValidator.java

@@ -76,15 +76,15 @@ public void setValidationQuery(String validationQuery) {
 
 	/**
 	 * Set the interval between validation runs (in seconds).
-	 * Default is 1.
+	 * Default is {@value #DEFAULT_INTERVAL}.
 	 */
 	public void setInterval(int interval) {
 		this.interval = interval;
 	}
 
 	/**
 	 * Set the timeout (in seconds) after which a fatal exception
-	 * will be thrown. Default is 60.
+	 * will be thrown. Default is {@value #DEFAULT_TIMEOUT}.
 	 */
 	public void setTimeout(int timeout) {
 		this.timeout = timeout;
@@ -127,11 +127,15 @@ public void afterPropertiesSet() {
 				}
 				catch (SQLException ex) {
 					latestEx = ex;
-					logger.debug("Validation query [" + this.validationQuery + "] threw exception", ex);
-					float rest = ((float) (deadLine - System.currentTimeMillis())) / 1000;
-					if (rest > this.interval) {
-						logger.warn("Database has not started up yet - retrying in " + this.interval +
-								" seconds (timeout in " + rest + " seconds)");
+					if (logger.isDebugEnabled()) {
+						logger.debug("Validation query [" + this.validationQuery + "] threw exception", ex);
+					}
+					if (logger.isWarnEnabled()) {
+						float rest = ((float) (deadLine - System.currentTimeMillis())) / 1000;
+						if (rest > this.interval) {
+							logger.warn("Database has not started up yet - retrying in " + this.interval +
+									" seconds (timeout in " + rest + " seconds)");
+						}
 					}
 				}
 				finally {
@@ -149,8 +153,8 @@ public void afterPropertiesSet() {
 						"Database has not started up within " + this.timeout + " seconds", latestEx);
 			}
 
-			float duration = (System.currentTimeMillis() - beginTime)*1f / 1000;
 			if (logger.isInfoEnabled()) {
+				float duration = ((float) (System.currentTimeMillis() - beginTime)) / 1000;
 				logger.info("Database startup detected after " + duration + " seconds");
 			}
 		}