<!--
    Licensed to the Apache Software Foundation (ASF) under one or more
    contributor license agreements.  See the NOTICE file distributed with
    this work for additional information regarding copyright ownership.
    The ASF licenses this file to You under the Apache License, Version 2.0
    (the "License"); you may not use this file except in compliance with
    the License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
-->
<!--
    Tune ActiveMQ broker so it can handle large number of queues (tens of thousands)
    For more information, see:
    http://activemq.apache.org/scaling-queues.html

    Be sure to make necessary changes in your startup script, to

    1. Give broker enough memory
    2. Disable dedicated task runner
    3. Skip file metadata updates when saving files (can increase performance of KahaDB store)

    e.g. ACTIVEMQ_OPTS="-Xmx2G -Dorg.apache.activemq.UseDedicatedTaskRunner=false -Dorg.apache.activemq.kahaDB.files.skipMetadataUpdate=true"

    To run ActiveMQ with this configuration add xbean:examples/conf/activemq-mqtt.xml to your command
    e.g. $ bin/activemq console xbean:examples/conf/activemq-mqtt.xml
 -->
<beans
  xmlns="http://www.springframework.org/schema/beans"
  xmlns:amq="http://activemq.apache.org/schema/core"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
  http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd">

    <!-- Allows us to use system properties as variables in this configuration file -->
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"/>

    <broker xmlns="http://activemq.apache.org/schema/core" brokerName="localhost" dataDirectory="${activemq.data}" useJmx="false" advisorySupport="false">

        <!--
            Turn on optimizedDispatch
            For more information, see:
            http://activemq.apache.org/per-destination-policies.html
        -->
        <destinationPolicy>
            <policyMap>
                <policyEntries>
                    <policyEntry queue=">" optimizedDispatch="true" />
                </policyEntries>
            </policyMap>
        </destinationPolicy>

        <!--
            In case you want to have some JMX statistics exposed,
            you can filter MBeans you're not interested in

            http://activemq.apache.org/jmx.html
        -->
        <managementContext>
            <managementContext createConnector="false" suppressMBean="endpoint=dynamicProducer,endpoint=Consumer,connectionName=*,destinationName=ActiveMQ.Advisory.*"/>
        </managementContext>

        <!--
            Use KahaDB for persistence. Try pre-allocating journal files for improved store performance
            For more information, see:
            http://activemq.apache.org/kahadb.html
        -->
        <persistenceAdapter>
            <kahaDB directory="${activemq.data}/kahadb" enableIndexWriteAsync="true" preallocationStrategy="zeros"/>
        </persistenceAdapter>

        <!--
            Use NIO transport
            For more information, see:
            http://activemq.apache.org/configuring-transports.html#ConfiguringTransports-TheNIOTransport

            Additionally for better scalability, use virtual topics instead of durable subscribers for reliable messages
            For more information, see:
            http://activemq.apache.org/mqtt.html

        -->
        <transportConnectors>
            <transportConnector name="mqtt+nio" uri="mqtt+nio://0.0.0.0:1883?transport.subscriptionStrategy=mqtt-virtual-topic-subscriptions"/>
        </transportConnectors>

    </broker>

</beans>
