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7.6. 部署连接工厂作为工件

本主题讨论实际建议。

在 部署方法 中，javax.jms.ConnectionFactory 服务直接由应用代码注册。通常，这个代码位于 Blueprint 容器中。蓝图 XML 可能是普通 OSGi 捆绑包的一部分，可使用 mvn: URI 进行安装，并存储在 Maven 存储库中（本地或远程）。与配置管理员配置相比，版本控制等捆绑包更容易。

pax-jms-config 版本 1.0.0 捆绑包为 连接工厂 配置添加部署方法。应用程序开发人员注册 javax.jms.(XA)ConnectionFactory 服务（通常使用 Bluerpint XML）并指定服务属性。然后，pax-jms-config 检测到注册的、代理特定连接工厂和（使用服务属性）将服务嵌套在通用、非代理特定的连接池中。

以下是使用 Blueprint XML 的三种 部署方法。

7.6.1. 手动部署连接因素

在此方法中，不需要 pax-jms-config 捆绑包。应用程序代码负责注册特定于代理和通用连接池。 

<!--
    Broker-specific, non-pooling, non-enlisting javax.jms.XAConnectionFactory
-->
<bean id="artemis" class="org.apache.activemq.artemis.jms.client.ActiveMQXAConnectionFactory">
    <argument value="tcp://localhost:61616" />
    <property name="callTimeout" value="2000" />
    <property name="initialConnectAttempts" value="3" />
</bean>

<!--
    Fuse exports this service from fuse-pax-transx-tm-narayana bundle.
-->
<reference id="tm" interface="javax.transaction.TransactionManager" />

<!--
    Non broker-specific, generic, pooling, enlisting javax.jms.ConnectionFactory
-->
<bean id="pool" class="org.messaginghub.pooled.jms.JmsPoolXAConnectionFactory">
    <property name="connectionFactory" ref="artemis" />
    <property name="transactionManager" ref="tm" />
    <property name="maxConnections" value="10" />
    <property name="idleTimeout" value="10000" />
</bean>

<!--
    Expose connection factory for use by application code (such as Camel, Spring, ...)
-->
<service interface="javax.jms.ConnectionFactory" ref="pool">
    <service-properties>
        <!-- Giving connection factory a name using one of these properties makes identification easier in jms:connectionfactories: -->
        <entry key="osgi.jndi.service.name" value="jms/artemis" />
        <!--<entry key="name" value="jms/artemis" />-->
        <!-- Without any of the above, name will fall back to "service.id" -->
    </service-properties>
</service>

以下是显示如何使用它的 shell 命令： 

karaf@root()> feature:install artemis-core-client artemis-jms-client
karaf@root()> install -s mvn:org.apache.commons/commons-pool2/2.5.0
Bundle ID: 244
karaf@root()> install -s mvn:org.messaginghub/pooled-jms/0.3.0
Bundle ID: 245
karaf@root()> install -s blueprint:file://$PQ_HOME/message-brokers/blueprints/artemis-manual.xml
Bundle ID: 246

karaf@root()> bundle:services -p 246

Bundle 246 provides:
--------------------
objectClass = [javax.jms.ConnectionFactory]
osgi.jndi.service.name = jms/artemis
osgi.service.blueprint.compname = pool
service.bundleid = 246
service.id = 340
service.scope = bundle
-----
objectClass = [org.osgi.service.blueprint.container.BlueprintContainer]
osgi.blueprint.container.symbolicname = artemis-manual.xml
osgi.blueprint.container.version = 0.0.0
service.bundleid = 246
service.id = 341
service.scope = singleton

karaf@root()> feature:install jms

karaf@root()> jms:connectionfactories
JMS Connection Factory
──────────────────────
jms/artemis

karaf@root()> jms:info -u admin -p admin jms/artemis
Property │ Value
─────────┼──────────────────────────
product  │ ActiveMQ
version  │ 2.4.0.amq-711002-redhat-1

如上方列表所示，Bartner 捆绑包将导出 javax.jms.ConnectionFactory 服务，该服务是一个通用、非特定于代理的连接池。特定于代理的 javax.jms.XAConnectionFactory 没有 注册为 OSGi 服务，因为 Blueprint XML 没有明确的 < service ref="artemis"> 声明。

7.6.2. 连接工厂部署

此方法以 规范 的方式显示使用 pax-jms-config。这与 Fuse 6.x 推荐的方法稍有不同，因为要求将配置指定为服务属性。

下面是蓝图 XML 示例： 

<!--
    A broker-specific org.ops4j.pax.jms.service.ConnectionFactoryFactory that can create (XA)ConnectionFactory
    using properties. It is registered by pax-jms-* bundles
-->
<reference id="connectionFactoryFactory"
        interface="org.ops4j.pax.jms.service.ConnectionFactoryFactory"
        filter="(type=artemis)" />

<!--
    Non broker-specific org.ops4j.pax.jms.service.PooledConnectionFactoryFactory that can create
    pooled connection factories with the help of org.ops4j.pax.jms.service.ConnectionFactoryFactory

    For example, pax-jms-pool-pooledjms bundle registers org.ops4j.pax.jms.service.PooledConnectionFactoryFactory
    with these properties:
     - pool = pooledjms
     - xa = true|false (both are registered)
-->
<reference id="pooledConnectionFactoryFactory"
        interface="org.ops4j.pax.jms.service.PooledConnectionFactoryFactory"
        filter="(&amp;(pool=pooledjms)(xa=true))" />

<!--
    When using XA connection factories, javax.transaction.TransactionManager service is not needed here.
    It is used internally by xa-aware pooledConnectionFactoryFactory.
-->
<!--<reference id="tm" interface="javax.transaction.TransactionManager" />-->

<!--
    Finally, use both factories to expose the pooled, xa-aware, connection factory.
-->
<bean id="pool" factory-ref="pooledConnectionFactoryFactory" factory-method="create">
    <argument ref="connectionFactoryFactory" />
    <argument>
        <props>
            <!--
                Properties needed by artemis-specific org.ops4j.pax.jms.service.ConnectionFactoryFactory
            -->
            <prop key="jms.url" value="tcp://localhost:61616" />
            <prop key="jms.callTimeout" value="2000" />
            <prop key="jms.initialConnectAttempts" value="3" />
            <!-- Properties needed by pooled-jms-specific org.ops4j.pax.jms.service.PooledConnectionFactoryFactory -->
            <prop key="pool.maxConnections" value="10" />
            <prop key="pool.idleTimeout" value="10000" />
        </props>
    </argument>
</bean>

<!--
    Expose connection factory for use by application code (such as Camel, Spring, ...)
-->
<service interface="javax.jms.ConnectionFactory" ref="pool">
    <service-properties>
        <!-- Giving connection factory a name using one of these properties makes identification easier in jms:connectionfactories: -->
        <entry key="osgi.jndi.service.name" value="jms/artemis" />
        <!--<entry key="name" value="jms/artemis" />-->
        <!-- Without any of the above, name will fall back to "service.id" -->
    </service-properties>
</service>

上例使用 factory an 使用 connection factory factories(…​)创建连接工厂。不需要明确引用 javax.transaction.TransactionManager 服务，因为它由 XA 感知池ed ConnectionFactoryonnectionFactoryy 内部跟踪。

以下是它在 Fuse/Karaf shell 中查找的方式： 

karaf@root()> feature:install jms pax-jms-artemis pax-jms-pool-pooledjms

karaf@root()> install -s blueprint:file://$PQ_HOME/message-brokers/blueprints/artemis-pax-jms-factory-pooledjms.xml
Bundle ID: 253
karaf@root()> bundle:services -p 253

Bundle 253 provides:
--------------------
objectClass = [javax.jms.ConnectionFactory]
osgi.jndi.service.name = jms/artemis
osgi.service.blueprint.compname = pool
service.bundleid = 253
service.id = 347
service.scope = bundle
-----
objectClass = [org.osgi.service.blueprint.container.BlueprintContainer]
osgi.blueprint.container.symbolicname = artemis-pax-jms-factory-pooledjms.xml
osgi.blueprint.container.version = 0.0.0
service.bundleid = 253
service.id = 348
service.scope = singleton

karaf@root()> jms:connectionfactories
JMS Connection Factory
──────────────────────
jms/artemis

karaf@root()> jms:info -u admin -p admin jms/artemis
Property │ Value
─────────┼──────────────────────────
product  │ ActiveMQ
version  │ 2.4.0.amq-711002-redhat-1

如上方列表所示，Bartner 捆绑包将导出 javax.jms.ConnectionFactory 服务，该服务是一个通用、非特定于代理的连接池。代理特定 javax.jms.XAConnectionFactory 没有 注册为 OSGi 服务，因为 Blueprint XML 没有明确的 < service ref="artemis"> 声明。

7.6.3. 连接工厂的混合部署

pax-jms-config 1.0.0 bundle 使用服务属性添加了另一种 嵌套 代理特定连接工厂中的一种方式。此方法与在 Fuse 6.x 中工作的方式匹配。

下面是蓝图 XML 示例： 

<!--
    Broker-specific, non-pooling, non-enlisting javax.jms.XAConnectionFactory
-->
<bean id="artemis" class="org.apache.activemq.artemis.jms.client.ActiveMQXAConnectionFactory">
    <argument value="tcp://localhost:61616" />
    <property name="callTimeout" value="2000" />
    <property name="initialConnectAttempts" value="3" />
</bean>

<!--
    Expose broker-specific connection factory with service properties.
    No need to expose pooling, enlisting, non broker-specific javax.jms.XAConnectionFactory. It will be registered
    automatically by pax-jms-config with the same properties as this <service>, but with a higher service.ranking
-->
<service id="pool" ref="artemis" interface="javax.jms.XAConnectionFactory">
    <service-properties>
        <!-- "pool" key is needed for pax-jms-config to wrap broker-specific connection factory inside connection pool -->
        <entry key="pool" value="pooledjms" />
        <!-- <service>/@id attribute does not propagate, but name of the connection factory is required using one of: -->
        <entry key="osgi.jndi.service.name" value="jms/artemis" />
        <!-- or: -->
        <!--<entry key="name" value="jms/artemis" />-->
        <!-- Other properties, that normally by e.g., pax-jms-pool-pooledjms -->
        <entry key="pool.maxConnections" value="10" />
        <entry key="pool.idleTimeout" value="10000" />
    </service-properties>
</service>

在上例中，您可以看到仅手动注册代理特定连接工厂。pool=pooledjms 服务属性是连接工厂跟踪器的提示，它由 pax-jms-config 捆绑包管理。带有这个 service 属性的连接工厂服务封装在池工厂内，在本示例中，pax-jms-pool-pooledjms。

以下是它在 Fuse/Karaf shell 中查找的方式： 

karaf@root()> feature:install jms pax-jms-config pax-jms-artemis pax-jms-pool-pooledjms

karaf@root()> install -s blueprint:file://$PQ_HOME/message-brokers/blueprints/artemis-pax-jms-discovery.xml
Bundle ID: 254

karaf@root()> bundle:services -p 254

Bundle 254 provides:
--------------------
objectClass = [javax.jms.XAConnectionFactory]
osgi.jndi.service.name = jms/artemis
osgi.service.blueprint.compname = artemis
pool = pooledjms
pool.idleTimeout = 10000
pool.maxConnections = 10
service.bundleid = 254
service.id = 349
service.scope = bundle
-----
objectClass = [org.osgi.service.blueprint.container.BlueprintContainer]
osgi.blueprint.container.symbolicname = artemis-pax-jms-discovery.xml
osgi.blueprint.container.version = 0.0.0
service.bundleid = 254
service.id = 351
service.scope = singleton

karaf@root()> service:list javax.jms.XAConnectionFactory
[javax.jms.XAConnectionFactory]
-------------------------------
 osgi.jndi.service.name = jms/artemis
 osgi.service.blueprint.compname = artemis
 pool = pooledjms
 pool.idleTimeout = 10000
 pool.maxConnections = 10
 service.bundleid = 254
 service.id = 349
 service.scope = bundle
Provided by :
 Bundle 254
Used by:
 OPS4J Pax JMS Config (251)

karaf@root()> service:list javax.jms.ConnectionFactory
[javax.jms.ConnectionFactory]
-----------------------------
 osgi.jndi.service.name = jms/artemis
 osgi.service.blueprint.compname = artemis
 pax.jms.managed = true
 pax.jms.service.id.ref = 349
 pool.idleTimeout = 10000
 pool.maxConnections = 10
 service.bundleid = 251
 service.id = 350
 service.ranking = 1000
 service.scope = singleton
Provided by :
 OPS4J Pax JMS Config (251)

karaf@root()> jms:connectionfactories
JMS Connection Factory
──────────────────────
jms/artemis

karaf@root()> jms:info -u admin -p admin jms/artemis
Property │ Value
─────────┼──────────────────────────
product  │ ActiveMQ
version  │ 2.4.0.amq-711002-redhat-1

在上例中，jms:connectionfactories 仅显示一个服务，因为此命令会删除重复的名称。jdbc:ds-list 在数据源混合部署中介绍了两种服务。

javax.jms.XAConnectionFactory 从 Blueprint 捆绑包注册，它含有 pool = pooledjms 属性。

javax.jms.ConnectionFactory 从 pax-jms-config 捆绑包中注册，并且：

  • 它没有 pool = pooledjms 属性。在注册打包程序连接工厂时会删除它。
  • 它具有 service.ranking = 1000 属性，因此它始终是何时首选版本，例如查找连接工厂的名称。
  • 它具有 pax.jms.managed = true 属性，因此它不会尝试再次换行。
  • 它具有 pax.jms.service.id.ref = 349 属性，它指示在连接池中嵌套的原始连接工厂服务。
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