Add support for completion transitions

- Currently into as internal new feature, add state
  completed concecept and use it in various places.
- Main focus for this commit is to add support using
  anonymous transitions with state do actions which
  requires proper completion schematics.
- Internal functionality here will probably expose to
  user level in future releases using various other
  concepts.
- Backport #466
- Relates #504

spring-statemachine-samples/tasks/src/test/java/demo/tasks/TasksTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 the original author or authors.
+ * Copyright 2015-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,6 +25,8 @@ import java.util.Map;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -38,6 +40,7 @@ import org.springframework.statemachine.listener.StateMachineListener;
 import org.springframework.statemachine.listener.StateMachineListenerAdapter;
 import org.springframework.statemachine.state.State;
 import org.springframework.statemachine.transition.Transition;
+import org.springframework.util.StringUtils;
 
 import demo.CommonConfiguration;
 import demo.tasks.Application.Events;
@@ -45,6 +48,8 @@ import demo.tasks.Application.States;
 
 public class TasksTests {
 
+	private final static Log log = LogFactory.getLog(TasksTests.class);
+
 	private AnnotationConfigApplicationContext context;
 
 	private StateMachine<States,Events> machine;
@@ -61,9 +66,9 @@ public class TasksTests {
 
 	@Test
 	public void testRunOnce() throws InterruptedException {
-		listener.reset(8, 0, 0);
+		listener.reset(8, 8, 0);
 		tasks.run();
-		assertThat(listener.stateChangedLatch.await(8, TimeUnit.SECONDS), is(true));
+		assertThat(listener.stateEnteredLatch.await(8, TimeUnit.SECONDS), is(true));
 		assertThat(machine.getState().getIds(), contains(States.READY));
 		Map<Object, Object> variables = machine.getExtendedState().getVariables();
 		assertThat(variables.size(), is(3));
@@ -71,23 +76,38 @@ public class TasksTests {
 
 	@Test
 	public void testRunTwice() throws InterruptedException {
-		listener.reset(8, 0, 0);
+		listener.reset(8, 8, 0);
 		tasks.run();
-		assertThat(listener.stateChangedLatch.await(8, TimeUnit.SECONDS), is(true));
+		assertThat(listener.stateEnteredLatch.await(8, TimeUnit.SECONDS), is(true));
 		assertThat(machine.getState().getIds(), contains(States.READY));
 
 		Map<Object, Object> variables = machine.getExtendedState().getVariables();
 		assertThat(variables.size(), is(3));
 
-		listener.reset(8, 0, 0);
+		listener.reset(8, 8, 0);
 		tasks.run();
-		assertThat(listener.stateChangedLatch.await(8, TimeUnit.SECONDS), is(true));
+		assertThat(listener.stateEnteredLatch.await(8, TimeUnit.SECONDS), is(true));
 		assertThat(machine.getState().getIds(), contains(States.READY));
 
 		variables = machine.getExtendedState().getVariables();
 		assertThat(variables.size(), is(3));
 	}
 
+	@Test
+	public void testRunSmoke() throws InterruptedException {
+		for (int i = 0; i < 20; i++) {
+			log.info("testRunSmoke SMOKE START " + i);
+			listener.reset(8, 8, 0);
+			tasks.run();
+
+			boolean await = listener.stateEnteredLatch.await(8, TimeUnit.SECONDS);
+			String reason = "Machine was " + machine + " " + StringUtils.collectionToCommaDelimitedString(listener.statesEntered);
+			assertThat(reason , await, is(true));
+			assertThat(machine.getState().getIds(), contains(States.READY));
+			log.info("testRunSmoke SMOKE STOP " + i);
+		}
+	}
+
 	@Test
 	public void testFailAutomaticFix() throws InterruptedException {
 		listener.reset(10, 0, 0);

spring-statemachine-samples/tasks/src/test/resources/logback.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{yyyy-MM-dd HH:mm:ss} %t %m%n</pattern>
+			<charset>utf8</charset>
+		</encoder>
+	</appender>
+
+	<root level="WARN">
+		<appender-ref ref="CONSOLE" />
+	</root>
+
+	<logger name="org.springframework.statemachine" level="DEBUG"/>
+
+</configuration>