Add Task Event Listener

Adds a Task Listener that emits the TaskExecution as an event via a
Spring Cloud Stream channel (essentially the listener serves as a SCSt
Source).

Resolves spring-cloud/spring-cloud-task#11

spring-cloud-task-stream/src/main/java/org/springframework/cloud/task/listener/TaskEventAutoConfiguration.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2016 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.cloud.task.listener;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.cloud.stream.annotation.EnableBinding;
+import org.springframework.cloud.stream.annotation.Output;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.integration.gateway.GatewayProxyFactoryBean;
+import org.springframework.messaging.MessageChannel;
+
+/**
+ *
+ * @author Michael Minella
+ */
+@Configuration
+@ConditionalOnClass(EnableBinding.class)
+@ConditionalOnBean(TaskLifecycleListener.class)
+@ConditionalOnProperty(prefix = "spring.cloud.task.events", name = "enabled", havingValue = "true", matchIfMissing = true)
+@PropertySource("classpath:/org/springframework/cloud/task/application.properties")
+public class TaskEventAutoConfiguration {
+
+	@Configuration
+	@EnableBinding(TaskEventChannels.class)
+	public static class ListenerConfiguration {
+
+		@Autowired
+		private TaskEventChannels taskEventChannels;
+
+		@Bean
+		public GatewayProxyFactoryBean taskEventListener() {
+			GatewayProxyFactoryBean factoryBean =
+					new GatewayProxyFactoryBean(TaskExecutionListener.class);
+
+			factoryBean.setDefaultRequestChannel(taskEventChannels.taskEvents());
+
+			return factoryBean;
+		}
+	}
+
+	public interface TaskEventChannels {
+
+		String TASK_EVENTS = "task-events";
+
+		@Output(TASK_EVENTS)
+		MessageChannel taskEvents();
+	}
+}

spring-cloud-task-stream/src/main/resources/META-INF/spring.factories

@@ -0,0 +1 @@
+org.springframework.boot.autoconfigure.EnableAutoConfiguration=org.springframework.cloud.task.listener.TaskEventAutoConfiguration

spring-cloud-task-stream/src/main/resources/org/springframework/cloud/task/application.properties

@@ -0,0 +1 @@
+spring.cloud.stream.bindings.task-events.contentType=application/json

spring-cloud-task-stream/src/test/java/org/springframework/cloud/task/launcher/TaskLauncherSinkTests.java

@@ -16,13 +16,12 @@
 
 package org.springframework.cloud.task.launcher;
 
-import static org.junit.Assert.assertEquals;
-
 import java.util.HashMap;
 import java.util.Map;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.SpringApplicationConfiguration;
 import org.springframework.cloud.deployer.spi.task.LaunchState;
@@ -34,6 +33,8 @@ import org.springframework.context.ApplicationContext;
 import org.springframework.messaging.support.GenericMessage;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
+import static org.junit.Assert.assertEquals;
+
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringApplicationConfiguration(classes = {TaskLauncherSinkApplication.class, TaskConfiguration.class} )
 public class TaskLauncherSinkTests {
@@ -47,7 +48,6 @@ public class TaskLauncherSinkTests {
 	@Bindings(TaskLauncherSink.class)
 	private Sink sink;
 
-
 	@Test
 	public void testSuccess() {
 		TaskConfiguration.TestTaskLauncher testTaskLauncher =

spring-cloud-task-stream/src/test/java/org/springframework/cloud/task/listener/TaskEventTests.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2016 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.cloud.task.listener;
+
+import org.junit.Test;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration;
+import org.springframework.cloud.stream.test.binder.TestSupportBinderAutoConfiguration;
+import org.springframework.cloud.task.configuration.EnableTask;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Configuration;
+
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * @author Michael Minella
+ */
+public class TaskEventTests {
+
+	@Test
+	public void testDefaultConfiguration() {
+		ConfigurableApplicationContext applicationContext =
+				SpringApplication.run(new Object[] {TaskEventsConfiguration.class,
+						TaskEventAutoConfiguration.class,
+						PropertyPlaceholderAutoConfiguration.class,
+						TestSupportBinderAutoConfiguration.class},
+				new String[] {"--spring.cloud.task.closecontext.enable=false",
+				"--spring.main.web-environment=false",
+				"--spring.cloud.stream.defaultBinder=test"});
+
+		assertNotNull(applicationContext.getBean("taskEventListener"));
+		assertNotNull(applicationContext.getBean(TaskEventAutoConfiguration.TaskEventChannels.class));
+	}
+
+	@Configuration
+	@EnableTask
+	public static class TaskEventsConfiguration {
+	}
+}