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| <a href="." >Queue Attributes</a> |
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| <h1 id="queue-attributes">Queue Attributes</h1> |
| <p>Queue attributes can be set in one of two ways. Either by configuring |
| them using the configuration file or by using the core API. This chapter |
| will explain how to configure each attribute and what effect the |
| attribute has.</p> |
| <h2 id="predefined-queues">Predefined Queues</h2> |
| <p>Queues can be predefined via configuration at a core level or at a JMS |
| level. Firstly let's look at a JMS level.</p> |
| <p>The following shows a queue predefined in the jms element of the <code>broker.xml</code> |
| configuration file.</p> |
| <pre><code><queue name="selectorQueue"> |
| <selector string="color='red'"/> |
| <durable>true</durable> |
| </queue> |
| </code></pre><p>This name attribute of queue defines the name of the queue. When we do |
| this at a jms level we follow a naming convention so the actual name of |
| the core queue will be <code>jms.queue.selectorQueue</code>.</p> |
| <p>The selector element defines what JMS message selector the predefined |
| queue will have. Only messages that match the selector will be added to |
| the queue. This is an optional element with a default of null when |
| omitted.</p> |
| <p>The durable element specifies whether the queue will be persisted. This |
| again is optional and defaults to true if omitted.</p> |
| <p>Secondly a queue can be predefined at a core level in the |
| <code>broker.xml</code> file. The following is an example.</p> |
| <pre><code><queues> |
| <queue name="jms.queue.selectorQueue"> |
| <address>jms.queue.selectorQueue</address> |
| <filter string="color='red'"/> |
| <durable>true</durable> |
| </queue> |
| </queues> |
| </code></pre><p>This is very similar to the JMS configuration, with 3 real differences |
| which are.</p> |
| <ol> |
| <li><p>The name attribute of queue is the actual name used for the queue |
| with no naming convention as in JMS.</p> |
| </li> |
| <li><p>The address element defines what address is used for routing |
| messages.</p> |
| </li> |
| <li><p>The filter uses the <em>Core filter syntax</em> (described in <a href="filter-expressions.html">filter Expressions</a>), <em>not</em> the |
| JMS selector syntax.</p> |
| </li> |
| </ol> |
| <h2 id="using-the-api">Using the API</h2> |
| <p>Queues can also be created using the core API or the management API.</p> |
| <p>For the core API, queues can be created via the |
| <code>org.apache.activemq.artemis.api.core.client.ClientSession</code> interface. There are |
| multiple <code>createQueue</code> methods that support setting all of the |
| previously mentioned attributes. There is one extra attribute that can |
| be set via this API which is <code>temporary</code>. setting this to true means |
| that the queue will be deleted once the session is disconnected.</p> |
| <p>Take a look at <a href="management.html">Management</a> for a description of the management API for creating |
| queues.</p> |
| <h2 id="configuring-queues-via-address-settings">Configuring Queues Via Address Settings</h2> |
| <p>There are some attributes that are defined against an address wildcard |
| rather than a specific queue. Here an example of an <code>address-setting</code> |
| entry that would be found in the <code>broker.xml</code> file.</p> |
| <pre><code><address-settings> |
| <address-setting match="jms.queue.exampleQueue"> |
| <dead-letter-address>jms.queue.deadLetterQueue</dead-letter-address> |
| <max-delivery-attempts>3</max-delivery-attempts> |
| <redelivery-delay>5000</redelivery-delay> |
| <expiry-address>jms.queue.expiryQueue</expiry-address> |
| <last-value-queue>true</last-value-queue> |
| <max-size-bytes>100000</max-size-bytes> |
| <page-size-bytes>20000</page-size-bytes> |
| <redistribution-delay>0</redistribution-delay> |
| <send-to-dla-on-no-route>true</send-to-dla-on-no-route> |
| <address-full-policy>PAGE</address-full-policy> |
| <slow-consumer-threshold>-1</slow-consumer-threshold> |
| <slow-consumer-policy>NOTIFY</slow-consumer-policy> |
| <slow-consumer-check-period>5</slow-consumer-check-period> |
| <auto-create-jms-queues>true</auto-create-jms-queues> |
| <auto-delete-jms-queues>true</auto-delete-jms-queues> |
| <auto-create-jms-topics>true</auto-create-jms-topics> |
| <auto-delete-jms-topics>true</auto-delete-jms-topics> |
| </address-setting> |
| </address-settings> |
| </code></pre><p>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 |
| <code>match</code> attribute. In the above example the settings would only be |
| applied to any addresses which exactly match the address |
| <code>jms.queue.exampleQueue</code>, but you can also use wildcards to apply sets |
| of configuration against many addresses. The wildcard syntax used is |
| described <a href="#wildcard-syntax">here</a>.</p> |
| <p>For example, if you used the <code>match</code> string <code>jms.queue.#</code> the settings |
| would be applied to all addresses which start with <code>jms.queue.</code> which |
| would be all JMS queues.</p> |
| <p>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.</p> |
| <p><code>max-delivery-attempts</code> defines how many time a cancelled message can be |
| redelivered before sending to the <code>dead-letter-address</code>. A full |
| explanation can be found <a href="#undelivered-messages.configuring">here</a>.</p> |
| <p><code>redelivery-delay</code> defines how long to wait before attempting redelivery |
| of a cancelled message. see <a href="#undelivered-messages.delay">here</a>.</p> |
| <p><code>expiry-address</code> defines where to send a message that has expired. see |
| <a href="#message-expiry.configuring">here</a>.</p> |
| <p><code>expiry-delay</code> defines the expiration time that will be used for |
| messages which are using the default expiration time (i.e. 0). For |
| example, if <code>expiry-delay</code> 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 <code>expiry-delay</code> to "-1" will disable this feature. The |
| default is "-1".</p> |
| <p><code>last-value-queue</code> defines whether a queue only uses last values or not. |
| see <a href="#last-value-queues">here</a>.</p> |
| <p><code>max-size-bytes</code> and <code>page-size-bytes</code> are used to set paging on an |
| address. This is explained <a href="#paging">here</a>.</p> |
| <p><code>redistribution-delay</code> defines how long to wait when the last consumer |
| is closed on a queue before redistributing any messages. see |
| <a href="#clusters">here</a>.</p> |
| <p><code>send-to-dla-on-no-route</code>. If a message is sent to an address, but the |
| server does not route it to any queues, for example, 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 set to true for that address, if the message is not routed |
| to any queues it will instead be sent to the dead letter address (DLA) |
| for that address, if it exists.</p> |
| <p><code>address-full-policy</code>. This attribute can have one of the following |
| values: PAGE, DROP, FAIL or BLOCK and determines what happens when an |
| address where <code>max-size-bytes</code> 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 following chapters for more info <a href="flow-control.html">Flow Control</a>, <a href="paging.html">Paging</a>.</p> |
| <p><code>slow-consumer-threshold</code>. The minimum rate of message consumption |
| allowed before a consumer is considered "slow." Measured in |
| messages-per-second. Default is -1 (i.e. disabled); any other valid |
| value must be greater than 0.</p> |
| <p><code>slow-consumer-policy</code>. What should happen when a slow consumer is |
| detected. <code>KILL</code> will kill the consumer's connection (which will |
| obviously impact any other client threads using that same connection). |
| <code>NOTIFY</code> will send a CONSUMER_SLOW management notification which an |
| application could receive and take action with. See <a href="slow-consumers.html">slow consumers</a> for more details |
| on this notification.</p> |
| <p><code>slow-consumer-check-period</code>. How often to check for slow consumers on a |
| particular queue. Measured in seconds. Default is 5. See <a href="slow-consumers.html">slow consumers</a> |
| for more information about slow consumer detection.</p> |
| <p><code>auto-create-jms-queues</code>. Whether or not the broker should automatically |
| create a JMS queue when a JMS message is sent to a queue whose name fits |
| the address <code>match</code> (remember, a JMS queue is just a core queue which has |
| the same address and queue name) or a JMS consumer tries to connect to a |
| queue whose name fits the address <code>match</code>. Queues which are auto-created |
| are durable, non-temporary, and non-transient. Default is <code>true</code>.</p> |
| <p><code>auto-delete-jms-queues</code>. Whether or not the broker should automatically |
| delete auto-created JMS queues when they have both 0 consumers and 0 messages. |
| Default is <code>true</code>.</p> |
| <p><code>auto-create-jms-topics</code>. Whether or not the broker should automatically |
| create a JMS topic when a JMS message is sent to a topic whose name fits |
| the address <code>match</code> (remember, a JMS topic is just a core address which has |
| one or more core queues mapped to it) or a JMS consumer tries to subscribe |
| to a topic whose name fits the address <code>match</code>. Default is <code>true</code>.</p> |
| <p><code>auto-delete-jms-topics</code>. Whether or not the broker should automatically |
| delete auto-created JMS topics once the last subscription on the topic has |
| been closed. Default is <code>true</code>.</p> |
| |
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