Extend transaction attributes with labels

TransactionAttribute now exposes a labels attribute that associates a
descriptive array of labels with a transaction.

Labels may be of a pure descriptive nature or may get evaluated by
transaction managers to associate technology-specific behavior
with the actual transaction.

spring-tx/src/test/java/org/springframework/transaction/annotation/AnnotationTransactionAttributeSourceTests.java

@@ -45,6 +45,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Colin Sampaleanu
  * @author Juergen Hoeller
  * @author Sam Brannen
+ * @author Mark Paluch
  */
 public class AnnotationTransactionAttributeSourceTests {
 
@@ -183,6 +184,21 @@ public class AnnotationTransactionAttributeSourceTests {
 		assertThat(actual.rollbackOn(new IOException())).isFalse();
 	}
 
+	@Test
+	public void labelsAreApplied() throws Exception {
+		Method method = TestBean11.class.getMethod("getAge");
+
+		AnnotationTransactionAttributeSource atas = new AnnotationTransactionAttributeSource();
+		TransactionAttribute actual = atas.getTransactionAttribute(method, TestBean11.class);
+
+		assertThat(actual.getLabels()).containsOnly("retryable", "long-running");
+
+		method = TestBean11.class.getMethod("setAge", Integer.TYPE);
+		actual = atas.getTransactionAttribute(method, method.getDeclaringClass());
+
+		assertThat(actual.getLabels()).containsOnly("short-running");
+	}
+
 	/**
 	 * Test that transaction attribute is inherited from class
 	 * if not specified on method.
@@ -693,6 +709,21 @@ public class AnnotationTransactionAttributeSourceTests {
 		}
 	}
 
+	@Transactional(label = {"retryable", "long-running"})
+	static class TestBean11 {
+
+		private int age = 10;
+
+		@Transactional(label = "short-running")
+		public void setAge(int age) {
+			this.age = age;
+		}
+
+		public int getAge() {
+			return age;
+		}
+	}
+
 
 	static class Ejb3AnnotatedBean1 implements ITestBean1 {