Messages can be set with an optional time to live when sending them.
Apache ActiveMQ Artemis will not deliver a message to a consumer after it's time to live has been exceeded. If the message hasn't been delivered by the time that time to live is reached the server can discard it.
Apache ActiveMQ Artemis's addresses can be assigned an expiry address so that, when messages are expired, they are removed from the queue and sent to the expiry address. Many different queues can be bound to an expiry address. These expired messages can later be consumed for further inspection.
Using Apache ActiveMQ Artemis Core API, you can set an expiration time directly on the message:
// message will expire in 5000ms from now message.setExpiration(System.currentTimeMillis() + 5000);
JMS MessageProducer allows to set a TimeToLive for the messages it sent:
// messages sent by this producer will be retained for 5s (5000ms) before expiration producer.setTimeToLive(5000);
Expired messages which are consumed from an expiry address have the following properties:
a String property containing the original address of the expired message
a String property containing the original queue of the expired message
a Long property containing the actual expiration time of the expired message
Configuring Expiry Delay
Default Expiry delay can be configured in the address-setting configuration:
<!-- expired messages in exampleQueue will be sent to the expiry address expiryQueue --> <address-setting match="exampleQueue"> <expiry-delay>10</expiry-delay> </address-setting>
expiry-delay defines the expiration time in milliseconds that will be used for messages
which are using the default expiration time (i.e. 0).
For example, if
expiry-delay is set to "10" and a message which is using the default
expiration time (i.e.10) arrives then its expiration time of "0" will be changed to "10."
However, if a message which is using an expiration time of "20" arrives then its expiration
time will remain unchanged. Setting
expiry-delay to "-1" will disable this feature.
The default is "-1".
Configuring Expiry Addresses
Expiry address are defined in the address-setting configuration:
<!-- expired messages in exampleQueue will be sent to the expiry address expiryQueue --> <address-setting match="exampleQueue"> <expiry-address>expiryQueue</expiry-address> </address-setting>
If messages are expired and no expiry address is specified, messages are simply removed from the queue and dropped. Address wildcards can be used to configure expiry address for a set of addresses.
Configuring The Expiry Reaper Thread
A reaper thread will periodically inspect the queues to check if messages have expired.
The reaper thread can be configured with the following properties in
How often the queues will be scanned to detect expired messages (in milliseconds, default is 30000ms, set to
-1to disable the reaper thread)
The reaper thread priority (it must be between 1 and 10, 10 being the highest priority, default is 3)
See the Message Expiration Example which shows how message expiry is configured and used with JMS.