2.3. camel-jms 项目的说明

Camel 路由使用以下端点 URI：

<route id="file-to-jms-route">
...
    <to uri="jms:queue:incomingOrders?transacted=true" />
</route>

<route id="jms-cbr-route">
    <from uri="jms:queue:incomingOrders?transacted=true" />
...
</route>

jms 组件使用以下代码片段配置：

<bean id="jms" class="org.apache.camel.component.jms.JmsComponent">
    <property name="connectionFactory">
        <reference interface="javax.jms.ConnectionFactory" />
    </property>
    <property name="transactionManager" ref="transactionManager"/>
</bean>

虽然 transactionManager 引用是：

<reference id="transactionManager" interface="org.springframework.transaction.PlatformTransactionManager" />

如您所见，JMS 连接工厂和 PlatformTransactionManager 的 Spring 接口都只是引用。在 Blueprint XML 中不需要定义它们。这些服务 由 Fuse 本身公开。

您已发现，使用 etc/org.ops4j.connectionfactory-amq7.cfg 创建了 javax.jms.ConnectionFactory。

事务管理器是：

karaf@root()> service:list org.springframework.transaction.PlatformTransactionManager
[org.springframework.transaction.PlatformTransactionManager]
------------------------------------------------------------
 service.bundleid = 21
 service.id = 527
 service.scope = singleton
Provided by :
 Red Hat Fuse :: Fuse Modules :: Transaction (21)
Used by:
 Red Hat Fuse :: Quickstarts :: camel-jms (256)

检查从中注册实际事务管理器的其他接口：

karaf@root()> headers 21

Red Hat Fuse :: Fuse Modules :: Transaction (21)
------------------------------------------------
...
Bundle-Name = Red Hat Fuse :: Fuse Modules :: Transaction
Bundle-SymbolicName = fuse-pax-transx-tm-narayana
Bundle-Vendor = Red Hat
...

karaf@root()> bundle:services -p 21

Red Hat Fuse :: Fuse Modules :: Transaction (21) provides:
----------------------------------------------------------
objectClass = [org.osgi.service.cm.ManagedService]
service.bundleid = 21
service.id = 519
service.pid = org.ops4j.pax.transx.tm.narayana
service.scope = singleton
 ----
objectClass = [javax.transaction.TransactionManager]
provider = narayana
service.bundleid = 21
service.id = 520
service.scope = singleton
 ----
objectClass = [javax.transaction.TransactionSynchronizationRegistry]
provider = narayana
service.bundleid = 21
service.id = 523
service.scope = singleton
 ----
objectClass = [javax.transaction.UserTransaction]
provider = narayana
service.bundleid = 21
service.id = 524
service.scope = singleton
 ----
objectClass = [org.jboss.narayana.osgi.jta.ObjStoreBrowserService]
provider = narayana
service.bundleid = 21
service.id = 525
service.scope = singleton
 ----
objectClass = [org.ops4j.pax.transx.tm.TransactionManager]
provider = narayana
service.bundleid = 21
service.id = 526
service.scope = singleton
 ----
objectClass = [org.springframework.transaction.PlatformTransactionManager]
service.bundleid = 21
service.id = 527
service.scope = singleton

事务管理器在这些界面中可用：

您可以在您需要的任何上下文中使用它们。例如 camel-jms 需要初始化 org.apache.camel.component.jms.JmsConfiguration.transactionManager 字段。这是示例使用的原因：

<reference id="transactionManager" interface="org.springframework.transaction.PlatformTransactionManager" />

例如：

<reference id="transactionManager" interface="javax.transaction.TransactionManager" />