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JEAP 6 - 從Server 上Remote 呼叫其他Server 上的 Clustered EJB

老公前幾天才跟我發飆說,如果我晚上回家再不理他,在家裡寫Blog的話
他就要跟我離婚,白天的工作就很忙了,
為了家庭的和睦,所以最近更新會慢一點。。。
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EJB Server 連結需要在兩邊的Server 做一些基本認證的連接點,
我們把EJB 設定為Cluster, 所以需要有HA 的機制,不會設定的,請到前面幾篇去看(連結)。
再啓動另一台JBoss 去呼叫兩個Cluster 的EJB instance.


呼叫的那個WAR (或是EAR) 請放在我們稱作Client端,被呼叫的EJB Server 我們叫接收端。

接收端
基本上接收端的機器不需要做特別的設定,僅需要建立一個Application user 即可。 所以,請到JBoss_INSTALL_PATH/bin 下,執行 add-user.sh or add-user.bat 如下
(如果你是Domain 的話,僅需要在Domain controller 下執行,如果你是在Standalone的話,請每個Server 都要執行喔!)

Lin-Christinateki-MacBook-Air:bin weimeilin$ ./add-user.sh

What type of user do you wish to add? 
 a) Management User (mgmt-users.properties) 
 b) Application User (application-users.properties) 
(a): (告訴系統是AP在用的)

Enter the details of the new user to add.
Realm (ApplicationRealm) : 
Username : christinaejb (使用者名稱)
Password : (輸入密碼)
Re-enter Password : (輸入密碼)
What roles do you want this user to belong to? (Please enter a comma separated list, or leave blank for none)[  ]: (使用者的角色,在這裡直接空白)
About to add user 'christina' for realm 'ApplicationRealm'
Is this correct yes/no? yes
Added user 'christina' to file '/Applications/demo/jboss-eap-6.0/standalone/configuration/application-users.properties'
Added user 'christina' to file '/Applications/demo/jboss-eap-6.0/domain/configuration/application-users.properties'
Added user 'christina' with roles remoteJMS to file '/Applications/demo/jboss-eap-6.0/standalone/configuration/application-roles.properties'
Added user 'christina' with roles remoteJMS to file '/Applications/demo/jboss-eap-6.0/domain/configuration/application-roles.properties'
Is this new user going to be used for one AS process to connect to another AS process e.g. slave domain controller?
yes/no? yes
To represent the user add the following to the server-identities definition <secret value="Y2hyaXN0aW5hZWpiNzk=" /> (等一下要用到的)


請注意最後這個加密後的值。

Client端

這裡才是需要注意的地方,因為這裡我們要在Server上設定可以對外聯接EJB的Connector, 沒錯,就是在Server上開個洞去連結EJB, 因為是開個連結,所以想當然爾就要一些安全性上的設定拉!請到 standalone-full.xml  or standalone-full-ha.xml 或是 domain.xml 裡面的 full or full-ha 的Profile下設定

1. 設定連接的密碼,在下面紅色的地方,打入你剛剛加密後得到的密碼


<management>
        <security-realms>
            <!--...-->
            <security-realm name="ejb-security-realm">
                <server-identities>
                    <secret value="dsHJfKDhhsjdas=="/>
                </server-identities>
            </security-realm>
        </security-realms>
</management>


2. 設定對外聯接的IP 與Socket 位置,也就是你的EJB Server 對外的remote IP 與port 通常default 都是 4447


<socket-binding-group name="standard-sockets" default-interface="public" port-offset="${jboss.socket.binding.port-offset:0}">
        <!--...-->
        <outbound-socket-binding name="remote-ejb">
            <remote-destination host="IP_ADDRESS" port="4447"/>
        </outbound-socket-binding>
        <outbound-socket-binding name="remote-ejb1">
            <remote-destination host="IP_ADDRESS" port="4547"/>
        </outbound-socket-binding>
</socket-binding-group>



3. 到Remote subsystem 下面設定你對外的連結名稱

<subsystem xmlns="urn:jboss:domain:remoting:1.1">
  <!--....-->
  <outbound-connections>
     <remote-outbound-connection name="remote-ejb-connection" outbound-socket-binding-ref="remote-ejb" security-realm="ejb-security-realm" username="christinaejb">
<properties>
  <property name="SASL_POLICY_NOANONYMOUS" value="false"/>
  <property name="SSL_ENABLED" value="false"/>
</properties>
      </remote-outbound-connection>

      <remote-outbound-connection name="remote-ejb-connection1" outbound-socket-binding-ref="remote-ejb1" security-realm="ejb-security-realm" username="christinaejb">
<properties>
  <property name="SASL_POLICY_NOANONYMOUS" value="false"/>
  <property name="SSL_ENABLED" value="false"/>
</properties>
      </remote-outbound-connection>
   </outbound-connections>
</subsystem>

其中,
1. remote-ejb-connection 就是你給這個remote connection的名字
2. remote-ejb 剛剛我們設定對外對應的socket名稱
3. ejb-security-realm 剛剛設定安全密碼的名稱
4. christinaejb 建立在ejb Server上的使用者名字
又因為這次是兩個server, 所以分別建立的兩次!

這樣Server上的設定都完成了, 接下來就是要到程式裡面去設定,告訴你的WAR 或是 EAR 你需要用哪幾個remote的 EJB connection

建立一個  jboss-ejb-client.xml , 如果是EAR, 請放在 EAR/META-INF, 如果是WAR 請放在WAR/META-INF

內容如下:


<jboss-ejb-client xmlns="urn:jboss:ejb-client:1.0">
    <client-context>
        <ejb-receivers>
            <remoting-ejb-receiver outbound-connection-ref="remote-ejb-connection"/>
            <remoting-ejb-receiver outbound-connection-ref="remote-ejb-connection1"/>
        </ejb-receivers>
    </client-context>
</jboss-ejb-client>

這裡很容易看出來,他其實就是告訴EAR/WAR 你有哪幾個remote ejb connection 可以用。

以上所有的設定都完成了,寫在JSP or Servlet中的code 也沒什麼大的驚喜,與EJB Client相同。

protected void doInvoke(){
   Context context=null;
   try{
      final Hashtable jndiProperties = new Hashtable();
      jndiProperties.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");
      context = new InitialContext(jndiProperties);
   }catch (Exception e) {
      e.printStackTrace();
   }

   MyStatusBeanRemote remote;
   try {
      remote = (MyStatusBeanRemote)context.lookup("ejb:MyEJBProjectEAR/MyEJBProject//MyStatusBean!redhat.remotebeans.MyStatusBeanRemote?stateful");
      System.out.println("1."+remote.getState());
      remote.updateState("Christina");
      System.out.println("2."+remote.getState());
   } catch (NamingException e) {
      e.printStackTrace();
   }
}
之後啓動Server, 可以看到Server 去連結兩個ejb的client. (有個lookup 的小bug,目前我還在找patch中,會出error 但是基本上不會影響工作。AS7-4755  )

執行Servelt之後,可以看到回應很正常!以上!






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