BackOff abstraction lives in util.backoff subpackage now

Issue: SPR-11746

spring-core/src/main/java/org/springframework/util/backoff/BackOff.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.util;
+package org.springframework.util.backoff;
 
 /**
  * Provide a {@link BackOffExecution} that indicates the rate at which
@@ -23,23 +23,21 @@ package org.springframework.util;
  * <p>Users of this interface are expected to use it like this:
  *
  * <pre class="code">
- * {@code
- *
- *  BackOffExecution exec = backOff.start();
- *
- *  // In the operation recovery/retry loop:
- *  long waitInterval = exec.nextBackOffMillis();
- *  if (waitInterval == BackOffExecution.STOP) {
- *    // do not retry operation
- *  }
- *  else {
- *    // sleep, e.g. Thread.sleep(waitInterval)
- *    // retry operation
- *  }
+ * BackOffExecution exec = backOff.start();
+ *
+ * // In the operation recovery/retry loop:
+ * long waitInterval = exec.nextBackOffMillis();
+ * if (waitInterval == BackOffExecution.STOP) {
+ *     // do not retry operation
+ * }
+ * else {
+ *     // sleep, e.g. Thread.sleep(waitInterval)
+ *     // retry operation
+ * }
  * }</pre>
  *
- * Once the underlying operation has completed successfully, the execution
- * instance can be simply discarded.
+ * Once the underlying operation has completed successfully,
+ * the execution instance can be simply discarded.
  *
  * @author Stephane Nicoll
  * @since 4.1

spring-core/src/main/java/org/springframework/util/backoff/BackOffExecution.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.util;
+package org.springframework.util.backoff;
 
 /**
  * Represent a particular back-off execution.
@@ -23,7 +23,7 @@ package org.springframework.util;
  *
  * @author Stephane Nicoll
  * @since 4.1
- * @see org.springframework.util.BackOff
+ * @see BackOff
  */
 public interface BackOffExecution {
 

spring-core/src/main/java/org/springframework/util/backoff/ExponentialBackOff.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.util;
+package org.springframework.util.backoff;
 
 /**
  * Implementation of {@link BackOff} that increases the back off period for each
@@ -184,7 +184,7 @@ public class ExponentialBackOff implements BackOff {
 		@Override
 		public long nextBackOff() {
 			if (currentElapsedTime >= maxElapsedTime) {
-				return BackOffExecution.STOP;
+				return STOP;
 			}
 
 			long nextInterval = computeNextInterval();

spring-core/src/main/java/org/springframework/util/backoff/FixedBackOff.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.util;
+package org.springframework.util.backoff;
 
 /**
  * A simple {@link BackOff} implementation that provides a fixed interval
@@ -102,7 +102,7 @@ public class FixedBackOff implements BackOff {
 				return getInterval();
 			}
 			else {
-				return BackOffExecution.STOP;
+				return STOP;
 			}
 		}
 

spring-core/src/main/java/org/springframework/util/backoff/package-info.java

@@ -0,0 +1,8 @@
+
+/**
+ *
+ * A generic back-off abstraction.
+ *
+ */
+package org.springframework.util.backoff;
+

spring-core/src/test/java/org/springframework/util/ExponentialBackOffTests.java

@@ -22,6 +22,9 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
+import org.springframework.util.backoff.BackOffExecution;
+import org.springframework.util.backoff.ExponentialBackOff;
+
 /**
  *
  * @author Stephane Nicoll

spring-core/src/test/java/org/springframework/util/FixedBackOffTests.java

@@ -20,6 +20,9 @@ import static org.junit.Assert.*;
 
 import org.junit.Test;
 
+import org.springframework.util.backoff.BackOffExecution;
+import org.springframework.util.backoff.FixedBackOff;
+
 /**
  * @author Stephane Nicoll
  */

spring-jms/src/main/java/org/springframework/jms/config/DefaultJmsListenerContainerFactory.java

@@ -20,7 +20,7 @@ import java.util.concurrent.Executor;
 
 import org.springframework.jms.listener.DefaultMessageListenerContainer;
 import org.springframework.transaction.PlatformTransactionManager;
-import org.springframework.util.BackOff;
+import org.springframework.util.backoff.BackOff;
 
 /**
  * A {@link JmsListenerContainerFactory} implementation to build regular
@@ -54,69 +54,71 @@ public class DefaultJmsListenerContainerFactory
 
 	private BackOff backOff;
 
+
 	/**
-	 * @see DefaultMessageListenerContainer#setTaskExecutor(java.util.concurrent.Executor)
+	 * @see DefaultMessageListenerContainer#setTaskExecutor
 	 */
 	public void setTaskExecutor(Executor taskExecutor) {
 		this.taskExecutor = taskExecutor;
 	}
 
 	/**
-	 * @see DefaultMessageListenerContainer#setTransactionManager(PlatformTransactionManager)
+	 * @see DefaultMessageListenerContainer#setTransactionManager
 	 */
 	public void setTransactionManager(PlatformTransactionManager transactionManager) {
 		this.transactionManager = transactionManager;
 	}
 
 	/**
-	 * @see DefaultMessageListenerContainer#setCacheLevel(int)
+	 * @see DefaultMessageListenerContainer#setCacheLevel
 	 */
 	public void setCacheLevel(Integer cacheLevel) {
 		this.cacheLevel = cacheLevel;
 	}
 
 	/**
-	 * @see DefaultMessageListenerContainer#setCacheLevelName(String)
+	 * @see DefaultMessageListenerContainer#setCacheLevelName
 	 */
 	public void setCacheLevelName(String cacheLevelName) {
 		this.cacheLevelName = cacheLevelName;
 	}
 
 	/**
-	 * @see DefaultMessageListenerContainer#setConcurrency(String)
+	 * @see DefaultMessageListenerContainer#setConcurrency
 	 */
 	public void setConcurrency(String concurrency) {
 		this.concurrency = concurrency;
 	}
 
 	/**
-	 * @see DefaultMessageListenerContainer#setMaxMessagesPerTask(int)
+	 * @see DefaultMessageListenerContainer#setMaxMessagesPerTask
 	 */
 	public void setMaxMessagesPerTask(Integer maxMessagesPerTask) {
 		this.maxMessagesPerTask = maxMessagesPerTask;
 	}
 
 	/**
-	 * @see DefaultMessageListenerContainer#setReceiveTimeout(long)
+	 * @see DefaultMessageListenerContainer#setReceiveTimeout
 	 */
 	public void setReceiveTimeout(Long receiveTimeout) {
 		this.receiveTimeout = receiveTimeout;
 	}
 
 	/**
-	 * @see DefaultMessageListenerContainer#setRecoveryInterval(long)
+	 * @see DefaultMessageListenerContainer#setRecoveryInterval
 	 */
 	public void setRecoveryInterval(Long recoveryInterval) {
 		this.recoveryInterval = recoveryInterval;
 	}
 
 	/**
-	 * @see DefaultMessageListenerContainer#setBackOff(BackOff)
+	 * @see DefaultMessageListenerContainer#setBackOff
 	 */
 	public void setBackOff(BackOff backOff) {
 		this.backOff = backOff;
 	}
 
+
 	@Override
 	protected DefaultMessageListenerContainer createContainerInstance() {
 		return new DefaultMessageListenerContainer();
@@ -151,7 +153,7 @@ public class DefaultJmsListenerContainerFactory
 		if (this.backOff != null) {
 			container.setBackOff(this.backOff);
 			if (this.recoveryInterval != null) {
-				logger.warn("Ignoring recovery interval value as a BackOff instance is set.");
+				logger.warn("Ignoring recovery interval in DefaultJmsListenerContainerFactory in favor of BackOff");
 			}
 		}
 		else if (this.recoveryInterval != null) {

spring-jms/src/main/java/org/springframework/jms/listener/DefaultMessageListenerContainer.java

@@ -34,10 +34,10 @@ import org.springframework.jms.support.destination.DestinationResolver;
 import org.springframework.scheduling.SchedulingAwareRunnable;
 import org.springframework.scheduling.SchedulingTaskExecutor;
 import org.springframework.util.Assert;
-import org.springframework.util.BackOff;
-import org.springframework.util.BackOffExecution;
 import org.springframework.util.ClassUtils;
-import org.springframework.util.FixedBackOff;
+import org.springframework.util.backoff.BackOff;
+import org.springframework.util.backoff.BackOffExecution;
+import org.springframework.util.backoff.FixedBackOff;
 
 /**
  * Message listener container variant that uses plain JMS client APIs, specifically

spring-jms/src/main/resources/org/springframework/jms/config/spring-jms-4.1.xsd

@@ -329,7 +329,7 @@
 					]]></xsd:documentation>
 					<xsd:appinfo>
 						<tool:annotation kind="ref">
-							<tool:expected-type type="org.springframework.util.BackOff"/>
+							<tool:expected-type type="org.springframework.util.backoff.BackOff"/>
 						</tool:annotation>
 					</xsd:appinfo>
 				</xsd:annotation>

spring-jms/src/test/java/org/springframework/jms/config/JmsListenerContainerFactoryTests.java

@@ -16,9 +16,6 @@
 
 package org.springframework.jms.config;
 
-import static org.junit.Assert.*;
-import static org.mockito.Mockito.*;
-
 import javax.jms.ConnectionFactory;
 import javax.jms.MessageListener;
 import javax.jms.Session;
@@ -41,8 +38,11 @@ import org.springframework.jms.support.converter.MessageConverter;
 import org.springframework.jms.support.converter.SimpleMessageConverter;
 import org.springframework.jms.support.destination.DestinationResolver;
 import org.springframework.jms.support.destination.DynamicDestinationResolver;
-import org.springframework.util.BackOff;
-import org.springframework.util.FixedBackOff;
+import org.springframework.util.backoff.BackOff;
+import org.springframework.util.backoff.FixedBackOff;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
 
 /**
  *

spring-jms/src/test/java/org/springframework/jms/config/JmsNamespaceHandlerTests.java

@@ -16,14 +16,10 @@
 
 package org.springframework.jms.config;
 
-import static org.junit.Assert.*;
-import static org.mockito.BDDMockito.*;
-
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;
-
 import javax.jms.ConnectionFactory;
 import javax.jms.Message;
 import javax.jms.MessageListener;
@@ -48,9 +44,12 @@ import org.springframework.jms.listener.DefaultMessageListenerContainer;
 import org.springframework.jms.listener.adapter.MessageListenerAdapter;
 import org.springframework.jms.listener.endpoint.JmsMessageEndpointManager;
 import org.springframework.tests.sample.beans.TestBean;
-import org.springframework.util.BackOff;
 import org.springframework.util.ErrorHandler;
-import org.springframework.util.FixedBackOff;
+import org.springframework.util.backoff.BackOff;
+import org.springframework.util.backoff.FixedBackOff;
+
+import static org.junit.Assert.*;
+import static org.mockito.BDDMockito.*;
 
 /**
  * @author Mark Fisher

spring-jms/src/test/java/org/springframework/jms/listener/DefaultMessageListenerContainerTests.java

@@ -16,9 +16,6 @@
 
 package org.springframework.jms.listener;
 
-import static org.junit.Assert.*;
-import static org.mockito.BDDMockito.*;
-
 import javax.jms.Connection;
 import javax.jms.ConnectionFactory;
 import javax.jms.Destination;
@@ -28,8 +25,11 @@ import org.junit.Test;
 import org.mockito.invocation.InvocationOnMock;
 import org.mockito.stubbing.Answer;
 
-import org.springframework.util.BackOff;
-import org.springframework.util.BackOffExecution;
+import org.springframework.util.backoff.BackOff;
+import org.springframework.util.backoff.BackOffExecution;
+
+import static org.junit.Assert.*;
+import static org.mockito.BDDMockito.*;
 
 /**
  *

spring-jms/src/test/resources/org/springframework/jms/config/jmsNamespaceHandlerTests.xml

@@ -68,7 +68,7 @@
 
 	<bean id="testErrorHandler" class="org.springframework.jms.config.JmsNamespaceHandlerTests$TestErrorHandler"/>
 
-	<bean id="testBackOff" class="org.springframework.util.FixedBackOff">
+	<bean id="testBackOff" class="org.springframework.util.backoff.FixedBackOff">
 		<property name="interval" value="1000"/>
 	</bean>