Add setter for isolation level with a strongly typed parameter

Resolves #4032

spring-batch-core/src/main/java/org/springframework/batch/core/repository/support/AbstractJobRepositoryFactoryBean.java

@@ -32,6 +32,7 @@
 import org.springframework.beans.factory.InitializingBean;
 import org.springframework.transaction.PlatformTransactionManager;
 import org.springframework.transaction.TransactionManager;
+import org.springframework.transaction.annotation.Isolation;
 import org.springframework.transaction.interceptor.NameMatchTransactionAttributeSource;
 import org.springframework.transaction.interceptor.TransactionInterceptor;
 import org.springframework.transaction.support.TransactionSynchronizationManager;
@@ -59,10 +60,12 @@ public abstract class AbstractJobRepositoryFactoryBean implements FactoryBean<Jo
 
 	private boolean validateTransactionState = true;
 
+	private static final String ISOLATION_LEVEL_PREFIX = "ISOLATION_";
+
 	/**
 	 * Default value for isolation level in create* method.
 	 */
-	private static final String DEFAULT_ISOLATION_LEVEL = "ISOLATION_SERIALIZABLE";
+	private static final String DEFAULT_ISOLATION_LEVEL = ISOLATION_LEVEL_PREFIX + "SERIALIZABLE";
 
 	/**
 	 * @return fully configured {@link JobInstanceDao} implementation.
@@ -135,6 +138,21 @@ public void setIsolationLevelForCreate(String isolationLevelForCreate) {
 		this.isolationLevelForCreate = isolationLevelForCreate;
 	}
 
+	/**
+	 * public setter for the isolation level to be used for the transaction when
+	 * job execution entities are initially created. The default is
+	 * ISOLATION_SERIALIZABLE, which prevents accidental concurrent execution of
+	 * the same job (ISOLATION_REPEATABLE_READ would work as well).
+	 *
+	 * @param isolationLevelForCreate the isolation level to set
+	 *
+	 * @see SimpleJobRepository#createJobExecution(String,
+	 * org.springframework.batch.core.JobParameters)
+	 */
+	public void setIsolationLevelForCreate(Isolation isolationLevelForCreate) {
+		this.setIsolationLevelForCreate(ISOLATION_LEVEL_PREFIX + isolationLevelForCreate.name());
+	}
+
 	/**
 	 * Public setter for the {@link PlatformTransactionManager}.
 	 * @param transactionManager the transactionManager to set

spring-batch-core/src/test/java/org/springframework/batch/core/repository/support/JobRepositoryFactoryBeanTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2014 the original author or authors.
+ * Copyright 2006-2021 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.
@@ -40,6 +40,7 @@
 import org.springframework.jdbc.support.lob.LobHandler;
 import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.annotation.Isolation;
 import org.springframework.transaction.support.DefaultTransactionDefinition;
 
 import static org.junit.Assert.assertEquals;
@@ -52,6 +53,7 @@
 /**
  * @author Lucas Ward
  * @author Will Schipp
+ * @author Mahmoud Ben Hassine
  *
  */
 public class JobRepositoryFactoryBeanTests {
@@ -331,7 +333,7 @@ public void testTransactionAttributesForCreateMethod() throws Exception {
 	@Test
 	public void testSetTransactionAttributesForCreateMethod() throws Exception {
 
-		factory.setIsolationLevelForCreate("ISOLATION_READ_UNCOMMITTED");
+		factory.setIsolationLevelForCreate(Isolation.READ_UNCOMMITTED);
 		testCreateRepository();
 		JobRepository repository = factory.getObject();
 		DefaultTransactionDefinition transactionDefinition = new DefaultTransactionDefinition(

spring-batch-core/src/test/java/org/springframework/batch/core/test/concurrent/ConcurrentTransactionTests.java

@@ -58,6 +58,7 @@
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.transaction.annotation.Isolation;
 import org.springframework.util.ClassUtils;
 
 import static org.junit.Assert.assertEquals;
@@ -170,7 +171,7 @@ public Job concurrentJob() {
 		protected JobRepository createJobRepository() throws Exception {
 			JobRepositoryFactoryBean factory = new JobRepositoryFactoryBean();
 			factory.setDataSource(getDataSource());
-			factory.setIsolationLevelForCreate("ISOLATION_READ_COMMITTED");
+			factory.setIsolationLevelForCreate(Isolation.READ_COMMITTED);
 			factory.setTransactionManager(getTransactionManager());
 			factory.afterPropertiesSet();
 			return  factory.getObject();