Add sample JobParametersIncrementer for JMX demo

spring-batch-core/src/main/java/org/springframework/batch/core/JobExecution.java

@@ -21,7 +21,7 @@ import java.io.ObjectInputStream;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Date;
-import java.util.HashSet;
+import java.util.LinkedHashSet;
 import java.util.List;
 
 import org.springframework.batch.item.ExecutionContext;
@@ -37,7 +37,7 @@ public class JobExecution extends Entity {
 
 	private JobInstance jobInstance;
 
-	private volatile Collection<StepExecution> stepExecutions = new HashSet<StepExecution>();
+	private volatile Collection<StepExecution> stepExecutions = new LinkedHashSet<StepExecution>();
 
 	private volatile BatchStatus status = BatchStatus.STARTING;
 

spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/SimpleJobOperator.java

@@ -16,12 +16,12 @@
 package org.springframework.batch.core.launch.support;
 
 import java.util.ArrayList;
-import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.TreeSet;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -150,7 +150,7 @@ public class SimpleJobOperator implements JobOperator, InitializingBean {
 	 * @see org.springframework.batch.core.launch.JobOperator#getJobNames()
 	 */
 	public Set<String> getJobNames() {
-		return new HashSet<String>(jobRegistry.getJobNames());
+		return new TreeSet<String>(jobRegistry.getJobNames());
 	}
 
 	/*

spring-batch-samples/src/main/java/org/springframework/batch/sample/common/InfiniteLoopIncrementer.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2006-2007 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.batch.sample.common;
+
+import org.springframework.batch.core.JobParameters;
+import org.springframework.batch.core.JobParametersBuilder;
+import org.springframework.batch.core.JobParametersIncrementer;
+
+/**
+ * @author Dave Syer
+ *
+ */
+public class InfiniteLoopIncrementer implements JobParametersIncrementer {
+
+	/**
+	 * Increment the run.id parameter.
+	 */
+	public JobParameters getNext(JobParameters parameters) {
+		if (parameters==null || parameters.isEmpty()) {
+			return new JobParametersBuilder().addLong("run.id", 1L).toJobParameters();
+		}
+		long id = parameters.getLong("run.id",1L) + 1;
+		return new JobParametersBuilder().addLong("run.id", id).toJobParameters();
+	}
+
+}

spring-batch-samples/src/main/resources/jobs/adhocLoopJob.xml

@@ -23,6 +23,9 @@
 				</property>
 			</bean>
 		</property>
+		<property name="jobParametersIncrementer">
+			<bean class="org.springframework.batch.sample.common.InfiniteLoopIncrementer"/>
+		</property>
 	</bean>
 
 	<aop:config>