Update configuration properties to use Duration

Update appropriate configuration properties to use the `Duration`
type, rather than an ad-hoc mix of milliseconds or seconds.

Configuration properties can now be defined in a consistent and readable
way. For example `server.session.timeout=5m`.

Properties that were previously declared using seconds are annotated
with `@DurationUnit` to ensure a smooth upgrade experience. For example
`server.session.timeout=20` continues to mean 20 seconds.

Fixes gh-11080

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/DevToolsProperties.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.devtools.autoconfigure;
 
 import java.io.File;
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -62,10 +63,6 @@ public class DevToolsProperties {
 				+ "META-INF/resources/**,resources/**,static/**,public/**,templates/**,"
 				+ "**/*Test.class,**/*Tests.class,git.properties,META-INF/build-info.properties";
 
-		private static final long DEFAULT_RESTART_POLL_INTERVAL = 1000;
-
-		private static final long DEFAULT_RESTART_QUIET_PERIOD = 400;
-
 		/**
 		 * Enable automatic restart.
 		 */
@@ -82,15 +79,15 @@ public class DevToolsProperties {
 		private String additionalExclude;
 
 		/**
-		 * Amount of time (in milliseconds) to wait between polling for classpath changes.
+		 * Amount of time to wait between polling for classpath changes.
 		 */
-		private long pollInterval = DEFAULT_RESTART_POLL_INTERVAL;
+		private Duration pollInterval = Duration.ofSeconds(1);
 
 		/**
-		 * Amount of quiet time (in milliseconds) required without any classpath changes
-		 * before a restart is triggered.
+		 * Amount of quiet time required without any classpath changes before a restart is
+		 * triggered.
 		 */
-		private long quietPeriod = DEFAULT_RESTART_QUIET_PERIOD;
+		private Duration quietPeriod = Duration.ofMillis(400);
 
 		/**
 		 * Name of a specific file that when changed will trigger the restart check. If
@@ -139,19 +136,19 @@ public class DevToolsProperties {
 			this.additionalExclude = additionalExclude;
 		}
 
-		public long getPollInterval() {
+		public Duration getPollInterval() {
 			return this.pollInterval;
 		}
 
-		public void setPollInterval(long pollInterval) {
+		public void setPollInterval(Duration pollInterval) {
 			this.pollInterval = pollInterval;
 		}
 
-		public long getQuietPeriod() {
+		public Duration getQuietPeriod() {
 			return this.quietPeriod;
 		}
 
-		public void setQuietPeriod(long quietPeriod) {
+		public void setQuietPeriod(Duration quietPeriod) {
 			this.quietPeriod = quietPeriod;
 		}
 

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/filewatch/FileSystemWatcher.java

@@ -18,6 +18,7 @@ package org.springframework.boot.devtools.filewatch;
 
 import java.io.File;
 import java.io.FileFilter;
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -41,9 +42,9 @@ import org.springframework.util.Assert;
  */
 public class FileSystemWatcher {
 
-	private static final long DEFAULT_POLL_INTERVAL = 1000;
+	private static final Duration DEFAULT_POLL_INTERVAL = Duration.ofMillis(1000);
 
-	private static final long DEFAULT_QUIET_PERIOD = 400;
+	private static final Duration DEFAULT_QUIET_PERIOD = Duration.ofMillis(400);
 
 	private final List<FileChangeListener> listeners = new ArrayList<>();
 
@@ -77,14 +78,17 @@ public class FileSystemWatcher {
 	 * @param quietPeriod the amount of time required after a change has been detected to
 	 * ensure that updates have completed
 	 */
-	public FileSystemWatcher(boolean daemon, long pollInterval, long quietPeriod) {
-		Assert.isTrue(pollInterval > 0, "PollInterval must be positive");
-		Assert.isTrue(quietPeriod > 0, "QuietPeriod must be positive");
-		Assert.isTrue(pollInterval > quietPeriod,
+	public FileSystemWatcher(boolean daemon, Duration pollInterval,
+			Duration quietPeriod) {
+		Assert.notNull(pollInterval, "PollInterval must not be null");
+		Assert.notNull(quietPeriod, "QuietPeriod must not be null");
+		Assert.isTrue(pollInterval.toMillis() > 0, "PollInterval must be positive");
+		Assert.isTrue(quietPeriod.toMillis() > 0, "QuietPeriod must be positive");
+		Assert.isTrue(pollInterval.toMillis() > quietPeriod.toMillis(),
 				"PollInterval must be greater than QuietPeriod");
 		this.daemon = daemon;
-		this.pollInterval = pollInterval;
-		this.quietPeriod = quietPeriod;
+		this.pollInterval = pollInterval.toMillis();
+		this.quietPeriod = quietPeriod.toMillis();
 	}
 
 	/**