Add getter on TimerTrigger for period and count

- Backport #533
- Relates to #549

spring-statemachine-core/src/main/java/org/springframework/statemachine/trigger/TimerTrigger.java

@@ -57,6 +57,14 @@ public class TimerTrigger<S, E> extends LifecycleObjectSupport implements Trigge
 		this.count = count;
 	}
 
+	public long getPeriod() {
+		return period;
+	}
+
+	public int getCount() {
+		return count;
+	}
+
 	@Override
 	public boolean evaluate(TriggerContext<S, E> context) {
 		return false;

spring-statemachine-core/src/test/java/org/springframework/statemachine/trigger/TimerTriggerTests.java

@@ -19,6 +19,7 @@ import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.Matchers.containsInAnyOrder;
 import static org.hamcrest.Matchers.greaterThan;
 import static org.hamcrest.Matchers.notNullValue;
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertThat;
 
 import java.util.Map;
@@ -52,6 +53,15 @@ public class TimerTriggerTests extends AbstractStateMachineTests {
 		return new AnnotationConfigApplicationContext();
 	}
 
+	@Test
+	public void testGetter() {
+		final long period = 1000;
+		final int count = 1;
+		final TimerTrigger timerTrigger = new TimerTrigger(period, count);
+		assertEquals(period, timerTrigger.getPeriod());
+		assertEquals(count, timerTrigger.getCount());
+	}
+
 	@Test
 	public void testListenerEvents() throws Exception {
 		context.register(BaseConfig.class, Config1.class);