Add Job Event Messaging to tasks.

* Added test for sample and cleanup

* Added skipEventsListener

* Added new message format.

* Added integration tests.

* Updated application.properties to add json content type

resolves spring-cloud/spring-cloud-task#119

spring-cloud-task-samples/batch-events/src/main/java/io/spring/cloud/BatchEventsApplication.java

@@ -0,0 +1,100 @@
+/*
+ *  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 io.spring.cloud;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.springframework.batch.core.Job;
+import org.springframework.batch.core.Step;
+import org.springframework.batch.core.StepContribution;
+import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
+import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
+import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
+import org.springframework.batch.core.scope.context.ChunkContext;
+import org.springframework.batch.core.step.tasklet.Tasklet;
+import org.springframework.batch.item.ItemProcessor;
+import org.springframework.batch.item.ItemWriter;
+import org.springframework.batch.item.support.ListItemReader;
+import org.springframework.batch.repeat.RepeatStatus;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.task.configuration.EnableTask;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@SpringBootApplication
+@EnableTask
+@EnableBatchProcessing
+public class BatchEventsApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(BatchEventsApplication.class, args);
+	}
+
+	@Configuration
+	public static class JobConfiguration {
+
+		@Autowired
+		private JobBuilderFactory jobBuilderFactory;
+
+		@Autowired
+		private StepBuilderFactory stepBuilderFactory;
+
+		@Bean
+		public Step step1() {
+			return this.stepBuilderFactory.get("step1")
+					.tasklet(new Tasklet() {
+						@Override
+						public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {
+							System.out.println("Tasklet has run");
+							return RepeatStatus.FINISHED;
+						}
+					}).build();
+		}
+
+		@Bean
+		public Step step2() {
+			return this.stepBuilderFactory.get("step2")
+					.<String, String>chunk(3)
+					.reader(new ListItemReader<>(Arrays.asList("1", "2", "3", "4", "5", "6")))
+					.processor(new ItemProcessor<String, String>() {
+						@Override
+						public String process(String item) throws Exception {
+							return String.valueOf(Integer.parseInt(item) * -1);
+						}
+					})
+					.writer(new ItemWriter<String>() {
+						@Override
+						public void write(List<? extends String> items) throws Exception {
+							for (String item : items) {
+								System.out.println(">> " + item);
+							}
+						}
+					}).build();
+		}
+
+		@Bean
+		public Job job() {
+			return this.jobBuilderFactory.get("job")
+					.start(step1())
+					.next(step2())
+					.build();
+		}
+	}
+}

spring-cloud-task-samples/batch-events/src/main/resources/application.properties

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+logging.level.org.springframework.cloud.task=DEBUG
+logging.level.org.springframework.cloud.stream=DEBUG
+spring.application.name=batchEvents