Activemq message features: Message attributes

Message attributes:

• By default, messages in queue are persistent.
• The default priority of a message is 4.
• The timestamp is set when the message is sent.
• By default, a message never expires. If an expired message enters dlq, you can configure dlq and its processing policy.
• If the message is resending, it will be marked
• Jmsreplyto identifies the queue to which the response message is sent
• Jmscorelationid identifies the Message ID associated with the message. You can use this ID to connect multiple messages.
• JMS also records the number of message resends. The default value is 6.
• If there is a group of associated messages to be processed, You can group: you only need to set the name of the message group and the number of messages when the message is sent.
• If a transaction environment is in the message, txid is set
• In addition, activemq additionally sets the timestamp of message columns and columns on the server.
• In fact, a property jmsmimetype is added with the value of JMS/message.
• The value of the message attribute in activemq, not only the basic type, but also the list or map type (http://activemq.apache.org/structured-message-properties-and-mapmessages.html)

Message attributes:

Property name	Type	Default Value	Description
Jmsdestination	Javax. JMS. Destination	Set by the producer	Destination used by the producer
Jmsreplyto	Javax. JMS. Destination	Null	User Defined
Jmstype	String	Empty	User Defined
Jmsdeliverymode	Int	Deliverymode. Persistent	Indicator if messages shoshould be persisted
Jmspriority	Int	4	Value from 0-9
Jmsmessageid	String	Unique	Unique identifier for the message
Jmstimestamp	Long	Time the message was sent	Time in milliseconds
Jmscorrelationid	String	Null	User Defined
Jmsexpiration	Long	0	Time in milliseconds to expire the message-0 means never expire
Jmsredelivered	Boolean	False	True if the message is being resent to the consumer

Attributes defined by JMS:

Property name	Type	Default Value	Description
Jmsxdeliverycount	Int	0	Number of attempts to send the message
Jmsxgroupid	String	Null	Identity of the message group
Jmsxgroupseq	Int	0	Sequence Number of the message
Jmsxproducertxid	String	Null	Transaction identifier

Additional definitions of activemq:

Property name	Type	Default Value	Description
Jmsactivemqbrokerintime	Long	0	Timestamp of message arrival Broker
Jmsactivemqbrokerouttime	Long	0	Timestamp of message exit Broker