Added code to record task completion when process is terminated gracefully

Updated per code review

Updates for merge

spring-cloud-task-core/src/main/java/org/springframework/cloud/task/listener/TaskLifecycleListener.java

@@ -27,6 +27,7 @@ import java.util.List;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.springframework.beans.factory.DisposableBean;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.ApplicationArguments;
@@ -62,7 +63,7 @@ import org.springframework.util.Assert;
  *
  * @author Michael Minella
  */
-public class TaskLifecycleListener implements ApplicationListener<ApplicationEvent>, SmartLifecycle {
+public class TaskLifecycleListener implements ApplicationListener<ApplicationEvent>, SmartLifecycle, DisposableBean {
 
 	@Autowired
 	private ConfigurableApplicationContext context;
@@ -78,6 +79,8 @@ public class TaskLifecycleListener implements ApplicationListener<ApplicationEve
 
 	private boolean started = false;
 
+	private boolean finished = false;
+
 	private TaskNameResolver taskNameResolver;
 
 	private ApplicationArguments applicationArguments;
@@ -139,7 +142,7 @@ public class TaskLifecycleListener implements ApplicationListener<ApplicationEve
 	}
 
 	private void doTaskEnd() {
-		if(started) {
+		if(this.started && !this.finished) {
 			this.taskExecution.setEndTime(new Date());
 
 			if(this.exitCodeEvent != null) {
@@ -164,11 +167,14 @@ public class TaskLifecycleListener implements ApplicationListener<ApplicationEve
 			taskRepository.completeTaskExecution(taskExecution.getExecutionId(), taskExecution.getExitCode(),
 					taskExecution.getEndTime(), taskExecution.getExitMessage());
 
+			this.finished = true;
+
 			if(this.closeContext && this.context.isActive()) {
 				this.context.close();
 			}
+
 		}
-		else {
+		else if(!this.started){
 			logger.error("An event to end a task has been received for a task that has " +
 					"not yet started.");
 		}
@@ -254,7 +260,6 @@ public class TaskLifecycleListener implements ApplicationListener<ApplicationEve
 
 	@Override
 	public void stop() {
-
 	}
 
 	@Override
@@ -266,4 +271,9 @@ public class TaskLifecycleListener implements ApplicationListener<ApplicationEve
 	public int getPhase() {
 		return 0;
 	}
+
+	@Override
+	public void destroy() throws Exception {
+		this.doTaskEnd();
+	}
 }

spring-cloud-task-docs/src/main/asciidoc/features.adoc

@@ -101,6 +101,9 @@ map uncaught exceptions to exit codes.  This allows you to be able to indicate a
 level what went wrong.  Also, by mapping exit codes in this manner, Spring Cloud Task will
 record the exit code returned.
 
+If the task is terminated with a SIG-INT or a SIG-TERM, the exit code will be zero unless
+otherwise specified within the code.
+
 NOTE: While the task is running the exit code will be stored as a null in the repository.
 Once complete the appropriate exit code will be stored based on the guidelines enumerated
 above.