捕風之巢

事務隔離EJB的使用

業(yè)務操作的事務性和事務隔離性，是 J2EE 開發(fā)中一個非常重要的功能。
比如，在業(yè)務操作中的系統(tǒng)日志和權限日志，就很好的體現(xiàn)了事務原子性和事務隔離的應用。

這里，主要講一下事務隔離 EJB 的使用。

?為了能在具有事務的 action 中調用不允許事務支持的外部系統(tǒng) EJB ，如 UMSAO ，增加了事務隔離 EJB 。

Facade4IsolateService.java
Facade4IsolateServiceEJB.java
Facade4IsolateServiceHome.java
public ? interface ?Facade4IsolateService? extends ?EJBLocalObject… {
???? public ? void ?getReadPrivList(List?permissionList,?List?userTypeList);
}
public ? class ?Facade4IsolateServiceEJB? extends ?PafaSlsSessionBean? {
???? public ? void ?getReadPrivList(List?permissionList,?List?userTypeList) {
????????…?…
????}
}
public ? interface ?Facade4IsolateServiceHome? extends ?EJBLocalHome
{
???? public ?Facade4IsolateService?create()? throws ?CreateException;
}

需要在相關文件中配置：

biz-context.xml
"ejb/test/Facade4IsolateService"在weblogic-ejb-jar.xml中配置，必須同名。

< bean? id ="isolateEJB" ????????class ="com.test.app.lwc.service.remoting.access.ejb.LocalStatelessSessionProxyFactoryBean" ?????lazy-init ="true" >
???????? < property? name ="jndiName" >
???????????? < value > ejb/test/Facade4IsolateService </ value >
???????? </ property >
???????? < property? name ="businessInterface" >
???????????? < value >
????????????????com.test.biz.service.ejb.Facade4IsolateService
???????????? </ value >
???????? </ property >
???????? < property? name ="jndiTemplate" >
???????????? < ref? local ="jndiTemplate" ? />
???????? </ property >
???? </ bean >

weblogic-ejb-jar.xml
Facade4IsolateServiceEJB在ejb-jar.xml文件中設置。

< weblogic-enterprise-bean >
???????? < ejb-name > Facade4IsolateServiceEJB </ ejb-name >
???????? < stateless-session-descriptor >
???????????? < pool >
???????????????? < max-beans-in-free-pool > 500 </ max-beans-in-free-pool >
???????????????? < initial-beans-in-free-pool > 1 </ initial-beans-in-free-pool >
???????????? </ pool >
???????? </ stateless-session-descriptor >
???????? < enable-call-by-reference > True </ enable-call-by-reference >
???? < local-jndi-name > ejb/test/Facade4IsolateService </ local-jndi-name >
???? </ weblogic-enterprise-bean >

ejb-jar.xml

< session? id ="Facade4IsolateServiceEJB" >
???????????? < ejb-name > Facade4IsolateServiceEJB </ ejb-name >
???????????? < local-home > com.test.biz.service.ejb.Facade4IsolateServiceHome </ local-home >
???????????? < local > com.test.biz.service.ejb.Facade4IsolateService </ local >
???????????? < ejb-class > com.test.biz.service.ejb.Facade4IsolateServiceEJB </ ejb-class >
???????????? < session-type > Stateless </ session-type >
???????????? < transaction-type > Container </ transaction-type >
???????????? < env-entry >
???????????????? < env-entry-name > ejb/BeanFactoryPath </ env-entry-name >
???????????????? < env-entry-type > java.lang.String </ env-entry-type >
???????????????? < env-entry-value > biz-context.xml </ env-entry-value >
???????????? </ env-entry >
???????? </ session >

? 設置事務的隔離屬性

< container-transaction >
???????????? < method >
???????????????? < ejb-name > Facade4IsolateServiceEJB </ ejb-name >
???????????????? < method-name > * </ method-name >
?????????????? </ method >
?????????????? < trans-attribute > NotSupported </ trans-attribute >
???????? </ container-transaction >

posted on 2007-01-15 16:01 捕風 閱讀(429) 評論(0)  編輯  收藏 所屬分類: java高級