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Fix for: https://issues.apache.org/jira/browse/AMQ-3045 

Adds an optional maximumRedeliveryDelay that defaults to -1 to indicate no max so behavior is unchanged from previous versions.  When the backoff multiplier is enabled and the maximumReliveryDelay is set > -1 then the delay returned by getNextReliveryDealy is capped by the max of either maximumReliveryDelay or redeliveryDelay preventing delays smaller than the configured redelivery delay.

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1078189 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Timothy A. Bish 2011-03-04 22:39:11 +00:00
parent 69f56058f2
commit f29c8011d0
2 changed files with 138 additions and 75 deletions
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13
activemq-core/src/main/java/org/apache/activemq/RedeliveryPolicy.java
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@ -34,6 +34,7 @@ public class RedeliveryPolicy implements Cloneable, Serializable {
// +/-15% for a 30% spread -cgs
private double collisionAvoidanceFactor = 0.15d;
private int maximumRedeliveries = 6;
private long maximumRedeliveryDelay = -1;
private long initialRedeliveryDelay = 1000L;
private boolean useCollisionAvoidance;
private boolean useExponentialBackOff;
@ -75,6 +76,14 @@ public class RedeliveryPolicy implements Cloneable, Serializable {
this.initialRedeliveryDelay = initialRedeliveryDelay;
}
public long getMaximumRedeliveryDelay() {
return maximumRedeliveryDelay;
}
public void setMaximumRedeliveryDelay(long maximumRedeliveryDelay) {
this.maximumRedeliveryDelay = maximumRedeliveryDelay;
}
public int getMaximumRedeliveries() {
return maximumRedeliveries;
}
@ -90,6 +99,10 @@ public class RedeliveryPolicy implements Cloneable, Serializable {
nextDelay = redeliveryDelay;
} else if (useExponentialBackOff && backOffMultiplier > 1) {
nextDelay = (long) (previousDelay * backOffMultiplier);
if(maximumRedeliveryDelay != -1 && nextDelay > maximumRedeliveryDelay) {
// in case the user made max redelivery delay less than redelivery delay for some reason.
nextDelay = Math.max(maximumRedeliveryDelay, redeliveryDelay);
}
} else {
nextDelay = previousDelay;
}

50
activemq-core/src/test/java/org/apache/activemq/RedeliveryPolicyTest.java
View File

@ -267,6 +267,56 @@ public class RedeliveryPolicyTest extends JmsTestSupport {
}
/**
* @throws Exception
*/
public void testMaximumRedeliveryDelay() throws Exception {
// Receive a message with the JMS API
RedeliveryPolicy policy = connection.getRedeliveryPolicy();
policy.setInitialRedeliveryDelay(10);
policy.setUseExponentialBackOff(true);
policy.setMaximumRedeliveries(-1);
policy.setRedeliveryDelay(50);
policy.setMaximumRedeliveryDelay(1000);
policy.setBackOffMultiplier((short) 2);
policy.setUseExponentialBackOff(true);
connection.start();
Session session = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
ActiveMQQueue destination = new ActiveMQQueue("TEST");
MessageProducer producer = session.createProducer(destination);
MessageConsumer consumer = session.createConsumer(destination);
// Send the messages
producer.send(session.createTextMessage("1st"));
producer.send(session.createTextMessage("2nd"));
session.commit();
TextMessage m;
for(int i = 0; i < 10; ++i) {
// we should be able to get the 1st message redelivered until a session.commit is called
m = (TextMessage)consumer.receive(2000);
assertNotNull(m);
assertEquals("1st", m.getText());
session.rollback();
}
m = (TextMessage)consumer.receive(2000);
assertNotNull(m);
assertEquals("1st", m.getText());
session.commit();
m = (TextMessage)consumer.receive(2000);
assertNotNull(m);
assertEquals("2nd", m.getText());
session.commit();
assertTrue(policy.getNextRedeliveryDelay(Long.MAX_VALUE) == 1000 );
}
/**
* @throws Exception
*/