MAIL_PRORITY header could be named X-Priority (X- namespace being
reserved for non-standard headers).
Additional values could be foreseen:
Highest Priority
High Priority
Normal (default if not defined)
Low Priority
Lowest Priority
I don't know if we have to use low or high numbers for high priority?
(see also for example
http://emailuniverse.com/ezine-tips/?Obscure-Email-Headers-%28Effective-Use-of-Email-Header-Fields,-Part-VI%29&id=182
http://www.chilkatsoft.com/p/p_471.asp
they seem to use 1 for high priority
)
Tks,
Eric
On 6/10/2010 16:48, [email protected] wrote:
Author: norman
Date: Wed Oct 6 14:48:27 2010
New Revision: 1005067
URL: http://svn.apache.org/viewvc?rev=1005067&view=rev
Log:
Add support for mail priority while dequeue mails from the ActiveMQMailQueue
(JAMES-1058)
Modified:
james/server/trunk/queue-activemq/src/main/java/org/apache/james/queue/activemq/ActiveMQMailQueue.java
james/server/trunk/spring-deployment/src/main/config/james/spring-beans.xml
Modified:
james/server/trunk/queue-activemq/src/main/java/org/apache/james/queue/activemq/ActiveMQMailQueue.java
URL:
http://svn.apache.org/viewvc/james/server/trunk/queue-activemq/src/main/java/org/apache/james/queue/activemq/ActiveMQMailQueue.java?rev=1005067&r1=1005066&r2=1005067&view=diff
==============================================================================
---
james/server/trunk/queue-activemq/src/main/java/org/apache/james/queue/activemq/ActiveMQMailQueue.java
(original)
+++
james/server/trunk/queue-activemq/src/main/java/org/apache/james/queue/activemq/ActiveMQMailQueue.java
Wed Oct 6 14:48:27 2010
@@ -66,6 +66,14 @@ import org.apache.mailet.MailAddress;
*
* See http://activemq.apache.org/blob-messages.html for more details
*
+ *
+ * Some other supported feature is handling of priorities. See:
+ *
+ * http://activemq.apache.org/how-can-i-support-priority-queues.html
+ *
+ * For this just add a {...@link Mail} attribute with name {...@link
#MAIL_PRIORITY} to it. It should use one of the following
+ * value {...@link #LOW_PRIORITY}, {...@link #NORMAL_PRIORITY}, {...@link
#HIGH_PRIORITY}
+ *
*
*/
public class ActiveMQMailQueue implements MailQueue {
@@ -92,6 +100,31 @@ public class ActiveMQMailQueue implement
public final static int BLOBMESSAGE_ONLY = 0;
/**
+ * Handle mail with lowest priority
+ */
+ public final static int LOW_PRIORITY = 1;
+
+ /**
+ * Handle mail with normal priority (this is the default)
+ */
+ public final static int NORMAL_PRIORITY = 2;
+
+ /**
+ * Handle mail with highest priority
+ */
+ public final static int HIGH_PRIORITY = 3;
+
+ /**
+ * Attribute name for support if priority. If the attribute is set and
priority handling is enabled it will take care of move the Mails with
+ * higher priority to the head of the queue (so the mails are faster
handled).
+ *
+ * For enabling the feature in AMQ and get some more informations see:
+ *
+ * http://activemq.apache.org/how-can-i-support-priority-queues.html
+ */
+ public final static String MAIL_PRIORITY = "JMSPriority";
+
+ /**
* Construct a new ActiveMQ based {...@link MailQueue}.
* The messageTreshold is used to calculate if a {...@link BytesMessage}
or a {...@link BlobMessage} should be used when queuing the mail in
* ActiveMQ. A {...@link BlobMessage} is used If the message size is
bigger then the messageTreshold. The size if in bytes.
@@ -362,7 +395,7 @@ public class ActiveMQMailQueue implement
BytesMessage message = session.createBytesMessage();
populateJMSProperties(message, mail, delayInMillis);
-
+ populateJMSHeaders(message, mail);
mail.getMessage().writeTo(new
BytesMessageOutputStream(message));;
return message;
} else {
@@ -374,6 +407,8 @@ public class ActiveMQMailQueue implement
}
BlobMessage message = amqSession.createBlobMessage(new
MimeMessageInputStream(mail.getMessage()));
populateJMSProperties(message, mail, delayInMillis);
+ populateJMSHeaders(message, mail);
+
return message;
}
@@ -447,8 +482,17 @@ public class ActiveMQMailQueue implement
message.setStringProperty(JAMES_MAIL_ATTRIBUTE_NAMES,
attrsBuilder.toString());
message.setStringProperty(JAMES_MAIL_SENDER, sender);
message.setStringProperty(JAMES_MAIL_STATE, mail.getState());
-
+
+
}
+
+ private void populateJMSHeaders(Message message, Mail mail) throws
JMSException, MessagingException {
+ Object prio = mail.getAttribute(MAIL_PRIORITY);
+ if (prio instanceof Integer) {
+ message.setJMSPriority((Integer) prio);
+ }
+ }
+
/**
* Convert the attribute value if necessary.
*
Modified:
james/server/trunk/spring-deployment/src/main/config/james/spring-beans.xml
URL:
http://svn.apache.org/viewvc/james/server/trunk/spring-deployment/src/main/config/james/spring-beans.xml?rev=1005067&r1=1005066&r2=1005067&view=diff
==============================================================================
--- james/server/trunk/spring-deployment/src/main/config/james/spring-beans.xml
(original)
+++ james/server/trunk/spring-deployment/src/main/config/james/spring-beans.xml
Wed Oct 6 14:48:27 2010
@@ -130,6 +130,17 @@
<!-- lets create an embedded ActiveMQ Broker -->
<amq:broker useJmx="false" persistent="true" dataDirectory="../data/"
schedulerSupport="true" id="broker">
+<amq:destinationPolicy>
+<amq:policyMap>
+<amq:policyEntries>
+<!-- Support priority handling of messages -->
+<!-- http://activemq.apache.org/how-can-i-support-priority-queues.html -->
+<!--
+<amq:policyEntry queue=">" prioritizedMessages="true"/>
+ -->
+</amq:policyEntries>
+</amq:policyMap>
+</amq:destinationPolicy>
<amq:transportConnectors>
<amq:transportConnector uri="tcp://localhost:0" />
</amq:transportConnectors>
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