Added ConditionalOnProperty for batch event listeners

Resolves spring-cloud/spring-cloud-task#130

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

@@ -82,17 +82,20 @@ public class BatchEventAutoConfiguration {
 
 		@Bean
 		@Lazy
+		@ConditionalOnProperty(prefix = "spring.cloud.task.events.job.execution.listener", name = "enabled", havingValue = "true", matchIfMissing = true)
 		public JobExecutionListener jobExecutionEventsListener() {
 			return new EventEmittingJobExecutionListener(listenerChannels.jobExecutionEvents());
 		}
 
 		@Bean
+		@ConditionalOnProperty(prefix = "spring.cloud.task.events.step.execution.listener", name = "enabled", havingValue = "true", matchIfMissing = true)
 		public StepExecutionListener stepExecutionEventsListener() {
 			return new EventEmittingStepExecutionListener(listenerChannels.stepExecutionEvents());
 		}
 
 		@Bean
 		@Lazy
+		@ConditionalOnProperty(prefix = "spring.cloud.task.events.chunk.events.listener", name = "enabled", havingValue = "true", matchIfMissing = true)
 		public GatewayProxyFactoryBean chunkEventsListener() {
 			GatewayProxyFactoryBean factoryBean =
 					new GatewayProxyFactoryBean(ChunkListener.class);
@@ -103,21 +106,25 @@ public class BatchEventAutoConfiguration {
 		}
 
 		@Bean
+		@ConditionalOnProperty(prefix = "spring.cloud.task.events.item.read.events.listener", name = "enabled", havingValue = "true", matchIfMissing = true)
 		public ItemReadListener itemReadEventsListener() {
 			return new EventEmittingItemReadListener(listenerChannels.itemReadEvents());
 		}
 
 		@Bean
+		@ConditionalOnProperty(prefix = "spring.cloud.task.events.item.write.events.listener", name = "enabled", havingValue = "true", matchIfMissing = true)
 		public ItemWriteListener itemWriteEventsListener() {
 			return new EventEmittingItemWriteListener(listenerChannels.itemWriteEvents());
 		}
 
 		@Bean
+		@ConditionalOnProperty(prefix = "spring.cloud.task.events.item.process.events.listener", name = "enabled", havingValue = "true", matchIfMissing = true)
 		public ItemProcessListener itemProcessEventsListener() {
 			return new EventEmittingItemProcessListener(listenerChannels.itemProcessEvents());
 		}
 
 		@Bean
+		@ConditionalOnProperty(prefix = "spring.cloud.task.events.skip.events.listener", name = "enabled", havingValue = "true", matchIfMissing = true)
 		public SkipListener skipEventsListener() {
 			return new EventEmittingSkipListener(listenerChannels.skipEvents());
 		}

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

@@ -31,11 +31,18 @@ import org.springframework.batch.core.JobInstance;
 import org.springframework.batch.core.JobParameter;
 import org.springframework.batch.core.JobParameters;
 import org.springframework.batch.core.StepExecution;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration;
 import org.springframework.cloud.task.batch.listener.support.JobExecutionEvent;
 import org.springframework.cloud.task.batch.listener.support.StepExecutionEvent;
+import org.springframework.cloud.task.configuration.EnableTask;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Configuration;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
 
 /**
  * @author Glenn Renfro.
@@ -46,6 +53,10 @@ public class EventJobExecutionTests {
 	private static final Long JOB_INSTANCE_ID = 1l;
 	private static final Long JOB_EXECUTION_ID = 2l;
 	private static final String JOB_CONFIGURATION_NAME = "FOO_JOB_CONFIG";
+	private static final String[] LISTENER_BEAN_NAMES = {BatchEventAutoConfiguration.JOB_EXECUTION_EVENTS_LISTENER,
+			BatchEventAutoConfiguration.STEP_EXECUTION_EVENTS_LISTENER, BatchEventAutoConfiguration.CHUNK_EVENTS_LISTENER,
+			BatchEventAutoConfiguration.ITEM_READ_EVENTS_LISTENER, BatchEventAutoConfiguration.ITEM_WRITE_EVENTS_LISTENER,
+			BatchEventAutoConfiguration.ITEM_PROCESS_EVENTS_LISTENER, BatchEventAutoConfiguration.SKIP_EVENTS_LISTENER};
 
 	private JobParameters jobParameters;
 	private JobInstance jobInstance;
@@ -112,6 +123,87 @@ public class EventJobExecutionTests {
 		assertEquals("foo stepExecution is not present", "foo", iter.next().getStepName());
 		assertEquals("bar stepExecution is not present", "bar", iter.next().getStepName());
 		assertEquals("baz stepExecution is not present", "baz", iter.next().getStepName());
+	}
 
+	@Test
+	public void testDefaultConfiguration() {
+		testDisabledConfiguration(null, null);
+	}
+
+	@Test
+	public void testDisabledJobExecutionListener() {
+		testDisabledConfiguration("spring.cloud.task.events.job.execution.listener.enabled",
+				BatchEventAutoConfiguration.JOB_EXECUTION_EVENTS_LISTENER);
+	}
+
+	@Test
+	public void testDisabledStepExecutionListener() {
+		testDisabledConfiguration("spring.cloud.task.events.step.execution.listener.enabled",
+				BatchEventAutoConfiguration.STEP_EXECUTION_EVENTS_LISTENER);
+	}
+
+	@Test
+	public void testDisabledChunkListener() {
+		testDisabledConfiguration("spring.cloud.task.events.chunk.events.listener.enabled",
+				BatchEventAutoConfiguration.CHUNK_EVENTS_LISTENER);
+	}
+
+	@Test
+	public void testDisabledItemReadListener() {
+		testDisabledConfiguration("spring.cloud.task.events.item.read.events.listener.enabled",
+				BatchEventAutoConfiguration.ITEM_READ_EVENTS_LISTENER);
+	}
+
+	@Test
+	public void testDisabledItemWriteListener() {
+		testDisabledConfiguration("spring.cloud.task.events.item.write.events.listener.enabled",
+				BatchEventAutoConfiguration.ITEM_WRITE_EVENTS_LISTENER);
+	}
+
+	@Test
+	public void testDisabledItemProcessListener() {
+		testDisabledConfiguration("spring.cloud.task.events.item.process.events.listener.enabled",
+				BatchEventAutoConfiguration.ITEM_PROCESS_EVENTS_LISTENER);
+	}
+
+	@Test
+	public void testDisabledSkipEventListener() {
+		testDisabledConfiguration("spring.cloud.task.events.skip.events.listener.enabled",
+				BatchEventAutoConfiguration.SKIP_EVENTS_LISTENER);
+	}
+
+	public void testDisabledConfiguration(String property, String disabledListener) {
+		boolean exceptionThrown = false;
+		String disabledPropertyArg = (property != null) ? "--" + property + "=false" : "";
+		ConfigurableApplicationContext applicationContext =
+				SpringApplication.run(new Object[]{BatchEventAutoConfiguration.JobExecutionListenerConfiguration.class,
+								EventJobExecutionConfiguration.class,
+								PropertyPlaceholderAutoConfiguration.class},
+						new String[]{"--spring.cloud.task.closecontext.enable=false",
+								"--spring.main.web-environment=false",
+								"--spring.cloud.stream.defaultBinder=test",
+								disabledPropertyArg});
+
+		for (String beanName : LISTENER_BEAN_NAMES) {
+			if (disabledListener != null && disabledListener.equals(beanName)) {
+				try {
+					applicationContext.getBean(disabledListener);
+				}
+				catch (NoSuchBeanDefinitionException nsbde) {
+					exceptionThrown = true;
+				}
+				assertTrue(String.format("Did not expect %s bean in context", beanName), exceptionThrown);
+			}
+			else {
+				applicationContext.getBean(beanName);
+			}
+		}
+		applicationContext.getBean(BatchEventAutoConfiguration.BatchEventsChannels.class);
+	}
+
+
+	@Configuration
+	@EnableTask
+	public static class EventJobExecutionConfiguration {
 	}
 }