# Configuring Addresses and Queues via Address Settings

There are some attributes that are defined against an address wildcard rather than a specific address/queue. Here an example of an `address-setting` entry that would be found in the `broker.xml` file.

    <address-settings>
       <address-setting match="order.foo">
          <dead-letter-address>DLA</dead-letter-address>
          <auto-create-dead-letter-resources>false</auto-create-dead-letter-resources>
          <dead-letter-queue-prefix>DLQ.</dead-letter-queue-prefix>
          <dead-letter-queue-suffix></dead-letter-queue-suffix>
          <expiry-address>ExpiryQueue</expiry-address>
          <auto-create-expiry-resources>false</auto-create-expiry-resources>
          <expiry-queue-prefix>EXP.</expiry-queue-prefix>
          <expiry-queue-suffix></expiry-queue-suffix>
          <expiry-delay>123</expiry-delay>
          <redelivery-delay>5000</redelivery-delay>
          <redelivery-delay-multiplier>1.0</redelivery-delay-multiplier>
          <redelivery-collision-avoidance-factor>0.0</redelivery-collision-avoidance-factor>
          <max-redelivery-delay>10000</max-redelivery-delay>
          <max-delivery-attempts>3</max-delivery-attempts>
          <max-size-bytes>100000</max-size-bytes>
          <max-size-messages>1000</max-size-messages>
          <max-size-bytes-reject-threshold>-1</max-size-bytes-reject-threshold>
          <page-size-bytes>20000</page-size-bytes>
          <address-full-policy>PAGE</address-full-policy>
          <message-counter-history-day-limit></message-counter-history-day-limit>
          <last-value-queue>true</last-value-queue> <!-- deprecated! see default-last-value-queue -->
          <default-last-value-queue>false</default-last-value-queue>
          <default-non-destructive>false</default-non-destructive>
          <default-exclusive-queue>false</default-exclusive-queue>
          <default-consumers-before-dispatch>0</default-consumers-before-dispatch>
          <default-delay-before-dispatch>-1</default-delay-before-dispatch>
          <redistribution-delay>0</redistribution-delay>
          <send-to-dla-on-no-route>false</send-to-dla-on-no-route>
          <slow-consumer-threshold>-1</slow-consumer-threshold>
          <slow-consumer-threshold-measurement-unit>MESSAGES_PER_SECOND</slow-consumer-threshold-measurement-unit>
          <slow-consumer-policy>NOTIFY</slow-consumer-policy>
          <slow-consumer-check-period>5</slow-consumer-check-period>
          <auto-create-queues>true</auto-create-queues>
          <auto-delete-queues>true</auto-delete-queues>
          <auto-delete-created-queues>false</auto-delete-created-queues>
          <auto-delete-queues-delay>0</auto-delete-queues-delay>
          <auto-delete-queues-message-count>0</auto-delete-queues-message-count>
          <config-delete-queues>OFF</config-delete-queues>
          <config-delete-diverts>OFF</config-delete-diverts>
          <auto-create-addresses>true</auto-create-addresses>
          <auto-delete-addresses>true</auto-delete-addresses>
          <auto-delete-addresses-delay>0</auto-delete-addresses-delay>
          <config-delete-addresses>OFF</config-delete-addresses>
          <management-browse-page-size>200</management-browse-page-size>
          <management-message-attribute-size-limit>256</management-message-attribute-size-limit>
          <default-purge-on-no-consumers>false</default-purge-on-no-consumers>
          <default-max-consumers>-1</default-max-consumers>
          <default-queue-routing-type></default-queue-routing-type>
          <default-address-routing-type></default-address-routing-type>
          <default-ring-size>-1</default-ring-size>
          <retroactive-message-count>0</retroactive-message-count>
          <enable-metrics>true</enable-metrics>
          <enable-ingress-timestamp>false</enable-ingress-timestamp>
       </address-setting>
    </address-settings>

The idea with address settings, is you can provide a block of settings which will be applied against any addresses that match the string in the `match` attribute. In the above example the settings would only be applied to the address "order.foo" address but you can also use wildcards to apply settings.

For example, if you used the `match` string `queue.#` the settings would be applied to all addresses which start with `queue.`

The meaning of the specific settings are explained fully throughout the user manual, however here is a brief description with a link to the appropriate chapter if available.

`dead-letter-address` is the address to which messages are sent when they exceed `max-delivery-attempts`. If no address is defined here then such messages will simply be discarded. Read more about undelivered messages.

`auto-create-dead-letter-resources` determines whether or not the broker will automatically create the defined `dead-letter-address` and a corresponding dead-letter queue when a message is undeliverable. Read more in the chapter about undelivered messages.

`dead-letter-queue-prefix` defines the prefix used for automatically created dead-letter queues. Read more in the chapter about undelivered messages.

`dead-letter-queue-suffix` defines the suffix used for automatically created dead-letter queues. Read more in the chapter about undelivered messages.

`expiry-address` defines where to send a message that has expired. If no address is defined here then such messages will simply be discarded. Read more about message expiry.

`auto-create-expiry-resources` determines whether or not the broker will automatically create the defined `expiry-address` and a corresponding expiry queue when a message expired. Read more in the chapter about undelivered messages.

`expiry-queue-prefix` defines the prefix used for automatically created expiry queues. Read more in the chapter about message expiry.

`expiry-queue-suffix` defines the suffix used for automatically created expiry queues. Read more in the chapter about message expiry.

`expiry-delay` defines the expiration time 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. 0) 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". Read more about message expiry.

`max-delivery-attempts` defines how many time a cancelled message can be redelivered before sending to the `dead-letter-address`. Read more about undelivered messages.

`redelivery-delay` defines how long to wait before attempting redelivery of a cancelled message. Default is `0`. Read more about undelivered messages.

`redelivery-delay-multiplier` defines the number by which the `redelivery-delay` will be multiplied on each subsequent redelivery attempt. Default is `1.0`. Read more about undelivered messages.

`redelivery-collision-avoidance-factor` defines an additional factor used to calculate an adjustment to the `redelivery-delay` (up or down). Default is `0.0`. Valid values are between 0.0 and 1.0. Read more about undelivered messages.

`max-size-bytes`, `max-size-messages`, `page-size-bytes`, `max-read-page-messages` & `max-read-page-bytes` are used to configure paging on an address. This is explained here.

`max-size-bytes-reject-threshold` is used with the address full `BLOCK` policy, the maximum size (in bytes) an address can reach before messages start getting rejected. Works in combination with `max-size-bytes` for AMQP clients only. Default is `-1` (i.e. no limit).

`address-full-policy`. This attribute can have one of the following values: `PAGE`, `DROP`, `FAIL` or `BLOCK` and determines what happens when an address where `max-size-bytes` is specified becomes full. The default value is `PAGE`. If the value is `PAGE` then further messages will be paged to disk. If the value is `DROP` then further messages will be silently dropped. If the value is `FAIL` then further messages will be dropped and an exception will be thrown on the client-side. If the value is `BLOCK` then client message producers will block when they try and send further messages. See the Flow Control and Paging chapters for more info.

`message-counter-history-day-limit` is the number of days to keep message counter history for this address assuming that `message-counter-enabled` is `true`. Default is `0`.

`default-last-value-queue` defines whether a queue only uses last values or not. Default is `false`. This value can be overridden at the queue level using the `last-value` boolean. Read more about last value queues.

`default-exclusive-queue` defines whether a queue will serve only a single consumer. Default is `false`. This value can be overridden at the queue level using the `exclusive` boolean. Read more about exclusive queues.

`default-consumers-before-dispatch` defines the number of consumers needed on a queue bound to the matching address before messages will be dispatched to those consumers. Default is `0`. This value can be overridden at the queue level using the `consumers-before-dispatch` boolean. This behavior can be tuned using `delay-before-dispatch` on the queue itself or by using the `default-delay-before-dispatch` address-setting.

`default-delay-before-dispatch` defines the number of milliseconds the broker will wait for the configured number of consumers to connect to the matching queue before it will begin to dispatch messages. Default is `-1` (wait forever).

`redistribution-delay` defines how long to wait when the last consumer is closed on a queue before redistributing any messages. Read more about clusters.

`send-to-dla-on-no-route`. If a message is sent to an address, but the server does not route it to any queues (e.g. there might be no queues bound to that address, or none of the queues have filters that match) then normally that message would be discarded. However, if this parameter is `true` then such a message will instead be sent to the `dead-letter-address` (DLA) for that address, if it exists. Default is `false`.

`slow-consumer-threshold`. The minimum rate of message consumption allowed before a consumer is considered "slow." Measured in units specified by the slow-consumer-threshold-measurement-unit configuration option. Default is `-1` (i.e. disabled); any other value must be greater than 0 to ensure a queue has messages, and it is the actual consumer that is slow. A value of 0 will allow a consumer with no messages pending to be considered slow. Read more about slow consumers.

`slow-consumer-threshold-measurement-unit`. The units used to measure the slow-consumer-threshold. Valid options are:

- MESSAGES_PER_SECOND
- MESSAGES_PER_MINUTE
- MESSAGES_PER_HOUR
- MESSAGES_PER_DAY

If no unit is specified the default MESSAGES_PER_SECOND will be used. Read more about slow consumers.

`slow-consumer-policy`. What should happen when a slow consumer is detected. `KILL` will kill the consumer's connection (which will obviously impact any other client threads using that same connection). `NOTIFY` will send a CONSUMER_SLOW management notification which an application could receive and take action with. Read more about slow consumers.

`slow-consumer-check-period`. How often to check for slow consumers on a particular queue. Measured in seconds. Default is `5`.

- Note: This should be at least 2x the maximum time it takes a consumer to process 1 message. For example, if the slow-consumer-threshold is set to 1 and the slow-consumer-threshold-measurement-unit is set to MESSAGES_PER_MINUTE then this should be set to at least 2 x 60s i.e. 120s. Read more about slow consumers.

`auto-create-queues`. Whether or not the broker should automatically create a queue when a message is sent or a consumer tries to connect to a queue whose name fits the address `match`. Queues which are auto-created are durable, non-temporary, and non-transient. Default is `true`. Note: automatic queue creation does not work for the core client. The core API is a low-level API and is not meant to have such automation.

`auto-delete-queues`. Whether or not the broker should automatically delete auto-created queues when they have both 0 consumers and the message count is less than or equal to `auto-delete-queues-message-count`. Default is `true`.

`auto-delete-created-queues`. Whether or not the broker should automatically delete created queues when they have both 0 consumers and the message count is less than or equal to `auto-delete-queues-message-count`. Default is `false`.

`auto-delete-queues-delay`. How long to wait (in milliseconds) before deleting auto-created queues after the queue has 0 consumers and the message count is less than or equal to `auto-delete-queues-message-count`. Default is `0` (delete immediately). The broker's `address-queue-scan-period` controls how often (in milliseconds) queues are scanned for potential deletion. Use `-1` to disable scanning. The default scan value is `30000`.

`auto-delete-queues-message-count`. The message count that the queue must be less than or equal to before deleting auto-created queues. To disable message count check `-1` can be set. Default is `0` (empty queue).

Note: the above auto-delete address settings can also be configured individually at the queue level when a client auto creates the queue.

For Core API it is exposed in createQueue methods.

For Core JMS you can set it using the destination queue attributes `my.destination?auto-delete=true&auto-delete-delay=120000&auto-delete-message-count=-1`

`config-delete-queues`. How the broker should handle queues deleted on config reload, by delete policy: `OFF` or `FORCE`. Default is `OFF`. Read more about configuration reload.

`config-delete-diverts`. How the broker should handle diverts deleted on config reload, by delete policy: `OFF` or `FORCE`. Default is `OFF`. Read more about configuration reload. `auto-create-addresses`. Whether or not the broker should automatically create an address when a message is sent to or a consumer tries to consume from a queue which is mapped to an address whose name fits the address `match`. Default is `true`. Note: automatic address creation does not work for the core client. The core API is a low-level API and is not meant to have such automation.

`auto-delete-addresses`. Whether or not the broker should automatically delete auto-created addresses once the address no longer has any queues. Default is `true`.

`auto-delete-addresses-delay`. How long to wait (in milliseconds) before deleting auto-created addresses after they no longer have any queues. Default is `0` (delete immediately). The broker's `address-queue-scan-period` controls how often (in milliseconds) addresses are scanned for potential deletion. Use `-1` to disable scanning. The default scan value is `30000`.

`config-delete-addresses`. How the broker should handle addresses deleted on config reload, by delete policy: `OFF` or `FORCE`. Default is `OFF`. Read more about configuration reload.

`management-browse-page-size` is the number of messages a management resource can browse. This is relevant for the `browse, list and count-with-filter` management methods exposed on the queue control. Default is `200`.

`management-message-attribute-size-limit` is the number of bytes collected from the message for browse. This is relevant for the `browse and list` management methods exposed on the queue control. Message attributes longer than this value appear truncated. Default is `256`. Use `-1` to switch this limit off. Note that memory needs to be allocated for all messages that are visible at a given moment. Setting this value too high may impact the browser stability due to the large amount of memory that may be required to browse through many messages.

`default-purge-on-no-consumers` defines a queue's default `purge-on-no-consumers` setting if none is provided on the queue itself. Default is `false`. This value can be overridden at the queue level using the `purge-on-no-consumers` boolean. Read more about this functionality.

`default-max-consumers` defines a queue's default `max-consumers` setting if none is provided on the queue itself. Default is `-1` (i.e. no limit). This value can be overridden at the queue level using the `max-consumers` boolean. Read more about this functionality.

`default-queue-routing-type` defines the routing-type for an auto-created queue if the broker is unable to determine the routing-type based on the client and/or protocol semantics. Default is `MULTICAST`. Read more about routing types.

`default-address-routing-type` defines the routing-type for an auto-created address if the broker is unable to determine the routing-type based on the client and/or protocol semantics. Default is `MULTICAST`. Read more about routing types.

`default-consumer-window-size` defines the default `consumerWindowSize` value for a `CORE` protocol consumer, if not defined the default will be set to 1 MiB (1024 * 1024 bytes). The consumer will use this value as the window size if the value is not set on the client. Read more about flow control.

`default-ring-size` defines the default `ring-size` value for any matching queue which doesn't have `ring-size` explicitly defined. If not defined the default will be set to -1. Read more about ring queues.

`retroactive-message-count` defines the number of messages to preserve for future queues created on the matching address. Defaults to 0. Read more about retroactive addresses.

`enable-metrics` determines whether or not metrics will be published to any configured metrics plugin for the matching address. Default is `true`. Read more about metrics.

`enable-ingress-timestamp` determines whether or not the broker will add its time to messages sent to the matching address. When `true` the exact behavior will depend on the specific protocol in use. For AMQP messages the broker will add a `long` message annotation named `x-opt-ingress-time`. For core messages (used by the core and OpenWire protocols) the broker will add a long property named `_AMQ_INGRESS_TIMESTAMP`. For STOMP messages the broker will add a frame header named `ingress-timestamp`. The value will be the number of milliseconds since the epoch. Default is `false`.

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