Add missing timeUnit in DefaultPollerProperties

Fixing docs

Resolves https://github.com/spring-cloud/spring-cloud-stream/issues/2052
Resolves #2053

docs/src/main/asciidoc/spring-cloud-stream.adoc

@@ -550,6 +550,21 @@ Maximum messages for each polling event of the default poller.
 +
 Default: 1L.
 
+cron::
+Cron expression value for the Cron Trigger.
++
+Default: none.
+
+initialDelay::
+Initial delay for periodic triggers.
++
+Default: 0.
+
+timeUnit::
+The TimeUnit to apply to delay values.
++
+Default: MILLISECONDS.
+
 For example `--spring.cloud.stream.poller.fixed-delay=2000` sets the poller interval to poll every two seconds.
 
 ===== Sending arbitrary data to an output (e.g. Foreign event-driven sources)

spring-cloud-stream/src/main/java/org/springframework/cloud/stream/config/DefaultPollerProperties.java

@@ -16,6 +16,8 @@
 
 package org.springframework.cloud.stream.config;
 
+import java.util.concurrent.TimeUnit;
+
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.integration.scheduling.PollerMetadata;
 import org.springframework.scheduling.support.CronTrigger;
@@ -49,13 +51,18 @@ public class DefaultPollerProperties {
 	 */
 	private int initialDelay = 0;
 
+	/**
+	 * The TimeUnit to apply to delay values.
+	 */
+	private TimeUnit timeUnit = TimeUnit.MILLISECONDS;
+
 	public PollerMetadata getPollerMetadata() {
 		PollerMetadata pollerMetadata = new PollerMetadata();
 		if (cron != null) {
 			pollerMetadata.setTrigger(new CronTrigger(cron));
 		}
 		else {
-			final PeriodicTrigger periodicTrigger = new PeriodicTrigger(this.fixedDelay);
+			final PeriodicTrigger periodicTrigger = new PeriodicTrigger(this.fixedDelay, this.timeUnit);
 			periodicTrigger.setInitialDelay(initialDelay);
 			pollerMetadata.setTrigger(periodicTrigger);
 		}
@@ -95,4 +102,12 @@ public class DefaultPollerProperties {
 	public void setInitialDelay(int initialDelay) {
 		this.initialDelay = initialDelay;
 	}
+
+	public TimeUnit getTimeUnit() {
+		return timeUnit;
+	}
+
+	public void setTimeUnit(TimeUnit timeUnit) {
+		this.timeUnit = timeUnit;
+	}
 }