ActiveMQ中Broker的应用与启动方式

　　Broker:英语有代理的意思，在activemq中，Broker就相当于一个Activemq实例。

1. 命令行启动实例:

1.activemq start使用默认的activemq.xml启动

E:\activemq\apache-activemq-5.15.\bin>pwd
/e/activemq/apache-activemq-5.15./bin

E:\activemq\apache-activemq-5.15.\bin>ls
activemq            activemq.bat  win32  wrapper.jar
activemq-admin.bat  activemq.jar  win64

E:\activemq\apache-activemq-5.15.\bin>activemq.bat
Java Runtime: Oracle Corporation 1.8.0_121 C:\Program Files\Java8\jdk1..0_121\jre
  Heap sizes: current=1005056k  free=989327k  max=1005056k
    JVM args: -Dcom.sun.management.jmxremote -Xms1G -Xmx1G -Djava.util.logging.config.file=logging.properties -Djava.se
urity.auth.login.config=E:\activemq\apache-activemq-5.15.\bin\..\conf\login.config -Dactivemq.classpath=E:\activemq\ap
che-activemq-5.15.\bin\..\conf;E:\activemq\apache-activemq-5.15.\bin\../conf;E:\activemq\apache-activemq-5.15.\bin\.
/conf; -Dactivemq.home=E:\activemq\apache-activemq-5.15.\bin\.. -Dactivemq.base=E:\activemq\apache-activemq-5.15.\bin
.. -Dactivemq.conf=E:\activemq\apache-activemq-5.15.\bin\..\conf -Dactivemq.data=E:\activemq\apache-activemq-5.15.\bi
\..\data -Djava.io.tmpdir=E:\activemq\apache-activemq-5.15.\bin\..\data\tmp
Extensions classpath:
  [E:\activemq\apache-activemq-5.15.\bin\..\lib,E:\activemq\apache-activemq-5.15.\bin\..\lib\camel,E:\activemq\apache
activemq-5.15.\bin\..\lib\optional,E:\activemq\apache-activemq-5.15.\bin\..\lib\web,E:\activemq\apache-activemq-5.15.
\bin\..\lib\extra]
ACTIVEMQ_HOME: E:\activemq\apache-activemq-5.15.\bin\..
ACTIVEMQ_BASE: E:\activemq\apache-activemq-5.15.\bin\..
ACTIVEMQ_CONF: E:\activemq\apache-activemq-5.15.\bin\..\conf
ACTIVEMQ_DATA: E:\activemq\apache-activemq-5.15.\bin\..\data
Usage: Main [--extdir <dir>] [task] [task-options] [task data]

Tasks:
    browse                   - Display selected messages in a specified destination.
    bstat                    - Performs a predefined query that displays useful statistics regarding the specified brok
r
    consumer                 - Receives messages from the broker
    create                   - Creates a runnable broker instance in the specified path.
    decrypt                  - Decrypts given text
    dstat                    - Performs a predefined query that displays useful tabular statistics regarding the specif
ed destination type
    encrypt                  - Encrypts given text
    export                   - Exports a stopped brokers data files to an archive file
    list                     - Lists all available brokers in the specified JMX context
    producer                 - Sends messages to the broker
    purge                    - Delete selected destination's messages that matches the message selector
    query                    - Display selected broker component's attributes and statistics.
    start                    - Creates and starts a broker using a configuration file, or a broker URI.
    stop                     - Stops a running broker specified by the broker name.

Task Options (Options specific to each task):
    --extdir <dir>  - Add the jar files in the directory to the classpath.
    --version       - Display the version information.
    -h,-?,--help    - Display this help information. To display task specific help, use Main [task] -h,-?,--help

Task Data:
    - Information needed by each specific task.

JMX system property options:
    -Dactivemq.jmx.url=<jmx service uri> (default is: 'service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi')
    -Dactivemq.jmx.user=<user name>
    -Dactivemq.jmx.password=<password>

E:\activemq\apache-activemq-5.15.\bin>activemq.bat start
Java Runtime: Oracle Corporation 1.8.0_121 C:\Program Files\Java8\jdk1..0_121\jre
  Heap sizes: current=1005056k  free=989327k  max=1005056k

启动后访问后台:

2.activemq start xbean:file:../conf/activemq2.xml   使用指定的配置文件进行启动

1.我们把con目录下的activemq2.xml重新命名为activemq2.xml

2.再次直接start启动会报错:

ERROR: org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path
resource [activemq.xml]; nested exception is java.io.FileNotFoundException: class path resource [activemq.xml] cannot be
 opened because it does not exist
org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resourc
e [activemq.xml]; nested exception is java.io.FileNotFoundException: class path resource [activemq.xml] cannot be opened
 because it does not exist

3.我们指定启动的xml文件位置再次启动可以启动成功

activemq start xbean:file:../conf/activemq2.xml

3.如果不指定file,也就是xbean:activemq2.xml，那么activemq2.xml必须在classpath目录下

2.用activemq来构建java应用---不依赖于ActiveMQ应用，只需要jar包即可实现

　　这里主要是用Activemq Broker作为独立的消息服务器来构建Java应用。简单的说，就是在java应用中启动activemq。这种方式会以进程的方式启动一个新的JVM来支持连接。

嵌入式Broker启动

　　下面的启动方式都不能通过http访问连接，要想测试是否启动成功只能通过收消息和发消息来测试。

1.通过BrokerService方式启动

        BrokerService brokerService = new BrokerService();
        brokerService.setUseJmx(true);
        brokerService.addConnector("tcp://localhost:61616");
        brokerService.start();

2.通过  BrokerFactory 启动

        String uri = "properties:broker.properties";
        BrokerService broker = BrokerFactory.createBroker(new URI(uri));
        broker.addConnector("tcp://localhost:61616");
        broker.start();

broker.properties内容如下:

useJmx=true
persistent=false
brokerName=QQQ

当然上面的确定方式都有对应的整合Spring之后的启动方式。

3.BrokerService方式整合spring启动

　　单例模式的BrokerService，加载完成之后调用start方法即可。

    <!--Broker启动方式-->
    <bean id="brokerService" class="org.apache.activemq.broker.BrokerService" init-method="start" destroy-method="stop">
        <property name="brokerName" value="broker1"/>
        <property name="persistent" value="false"/>
        <property name="transportConnectorURIs">
            <list>
                <value>tcp://localhost:61616</value>
            </list>
        </property>
    </bean>

从上面也可以看出，一个Broker可以配置多个连接的URI，如下面配置:(端口必须不同)

    <!--Broker启动方式-->
    <bean id="brokerService" class="org.apache.activemq.broker.BrokerService" init-method="start" destroy-method="stop">
        <property name="brokerName" value="broker1"/>
        <property name="persistent" value="false"/>
        <property name="transportConnectorURIs">
            <list>
                <value>tcp://localhost:61616</value>
                <value>tcp://localhost:61618</value>
            </list>
        </property>
    </bean>

4.通过  BrokerFactory 结合spring启动

spring的主配置文件:

    <!--Broker启动方式-->
    <bean id="brokerService" class="org.apache.activemq.xbean.BrokerFactoryBean">
        <property name="config" value="activemq.xml"/>
        <property name="start" value="true"/>
    </bean>

activemq.xml位于classpath下，内容如下:

<beans
        xmlns="http://www.springframework.org/schema/beans"
        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">

    <!--
        The <broker> element is used to configure the ActiveMQ broker.
    -->
    <broker xmlns="http://activemq.apache.org/schema/core" brokerName="localhost" dataDirectory="${activemq.data}">

        <destinationPolicy>
            <policyMap>
                <policyEntries>
                    <policyEntry topic=">" >
                        <!-- The constantPendingMessageLimitStrategy is used to prevent
                             slow topic consumers to block producers and affect other consumers
                             by limiting the number of messages that are retained
                             For more information, see:

                             http://activemq.apache.org/slow-consumer-handling.html

                        -->
                        <pendingMessageLimitStrategy>
                            <constantPendingMessageLimitStrategy limit="1000"/>
                        </pendingMessageLimitStrategy>
                    </policyEntry>
                </policyEntries>
            </policyMap>
        </destinationPolicy>

        <!--
          The systemUsage controls the maximum amount of space the broker will
          use before disabling caching and/or slowing down producers. For more information, see:
          http://activemq.apache.org/producer-flow-control.html
        -->
        <systemUsage>
            <systemUsage>
                <storeUsage>
                    <storeUsage limit="100 gb"/>
                </storeUsage>
                <tempUsage>
                    <tempUsage limit="50 gb"/>
                </tempUsage>
            </systemUsage>
        </systemUsage>

        <transportConnectors>
            <!-- DOS protection, limit concurrent connections to 1000 and frame size to 100MB -->
            <transportConnector name="openwire" uri="tcp://localhost:61616?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>
        </transportConnectors>
    </broker>
</beans>

3.ActiveMQ的Broker方式启动多个broker的方法

1.复制conf文件夹并重新命名为conf2

2.修改conf2文件下的activemq.xml

修改brokerName

修改持久化的数据目录

修改transportConnector的端口，要与第一个默认的不同

        <transportConnectors>
            <!-- DOS protection, limit concurrent connections to 1000 and frame size to 100MB -->
            <transportConnector name="openwire" uri="tcp://0.0.0.0:61617?maximumConnections=1000&amp;wireFormat.maxFrameSize=104857600"/>
        </transportConnectors>

3.修改conf2\jetty.xml,主要是改端口

    <bean id="jettyPort" class="org.apache.activemq.web.WebConsolePort" init-method="start">
             <!-- the default port number for the web console -->
        <property name="host" value="0.0.0.0"/>
        <property name="port" value="8162"/>
    </bean>

4.复制bin目录下面的activemq.bat并命名为activemq2.bat(如果是linux操作系统复制activemq)

5.修改activemq2.bat中的配置文件目录:

6.启动两个broker (如果是linux还需要赋予上面复制后的文件可执行权限 chmod +x activemq2)

activemq2.bat start  和 activemq.bat start

7.http界面查看jetty服务器