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REQUIREMENT

engine.qos.publish.priority

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Type NEW
Priority LOW
Status CLOSED
Topic XmlBlaster supports message priorities
Des
cription

Using the publish-QoS flag <priority> allows to set the priority of a message. A message with priority 9 has highest priority, 0 is lowest, default is 5.

Message with higher priority may overtake such with lower, as the queues highest sorting criterion is priority followed by the timestamp.

Keep in mind that only for messages with equal priority the message sequence is guaranteed

Example
XML 
      
<qos>  <!-- publish QoS -->
   <priority>9<priority/>  <!-- Highest priority -->
</qos>
Example
Java 
import org.xmlBlaster.util.def.Constants;
import org.xmlBlaster.util.MsgUnit;
import org.xmlBlaster.client.key.PublishKey;
import org.xmlBlaster.client.qos.PublishQos;

...

PublishKey pk = new PublishKey(glob, "HelloMsg");
PublishQos pq = new PublishQos(glob);

pq.setPriority(PriorityEnum.MAX_PRIORITY);

MsgUnit msgUnit = new MsgUnit(pk, senderContent.getBytes(), pq);

con.publish(msgUnit);
Configure

NOTE: Configuration parameters are specified on command line (-someValue 17) or in the xmlBlaster.properties file (someValue=17). See requirement "util.property" for details.
Columns named Impl tells you if the feature is implemented.
Columns named Hot tells you if the configuration is changeable in hot operation.

See API org.xmlBlaster.client.qos.PublishQos
See API org.xmlBlaster.util.def.Constants

This page is generated from the requirement XML file xmlBlaster/doc/requirements/engine.qos.publish.priority.xml

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