Question

我下载了BlueMix Java SQLDB Boilerplate，我正在玩它，正在寻找扩展其他表等等。我对发生的'autowiring'有点困惑，它将BlueMix中的数据库服务链接到应用程序部署/运行。

在样板文件中，persistence.xml中有一些配置说：

<persistence-unit name="openjpa-todo">
        <!-- The cloudAutowiring-1.0 Liberty feature will resolve this to whatever 
            the database service name is -->
        <!-- When running locally without this feature, create a datasource with 
            the JNDI name "jdbc/mydbdatasource" in server.xml -->
        <!-- If using MySQL locally then use the "url" property and append "?relaxAutoCommit=true", for example: 
            <dataSource id='mysql-datasource' jdbcDriverRef='mysql-driver' jndiName='jdbc/mydbdatasource'> 
                <properties user='root' password='password' url="jdbc:mysql://localhost:3306/db?relaxAutoCommit=true"/> 
            </dataSource> -->
        <jta-data-source>java:comp/env/jdbc/mydbdatasource</jta-data-source>
        <class>example.jpa.TODO</class>
        <properties>
            <!-- allow table definitions/creation on-the-fly jpa-2.0 feature -->
            <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)" />
            <!-- allow table definitions/creation on-the-fly jpa-2.1 feature -->
            <property name="eclipselink.ddl-generation" value="create-tables"/>
        </properties>
    </persistence-unit>

BlueMix / Liberty如何从已部署的服务映射到jta-data-source / persistence-unit？

自动装配是否需要满足任何条件或要求？

Answer 1

实际上非常酷。在部署应用程序期间，buildpack允许您执行一些额外的逻辑。 Liberty buildpack中有一些逻辑可以自动连接几个服务。监控和分析，记录，仅举几例。节点buildpack也是这样做的。

我已经捕获了下面的一些自动装配。

2015-04-10T15:24:51.98-0400 [STG]     OUT -----> Liberty Buildpack Version: v1.15-20150402-1422
2015-04-10T15:24:51.98-0400 [STG]     OUT -----> Retrieving IBM 7.1.2_sr2fp11ifx-20150312 JRE (ibm-java-jre-7.1-2.11-pxa6470_27sr2fp11ifx-20150312_01-sfj.tgz) ... (0.0s)
2015-04-10T15:24:52.82-0400 [STG]     OUT          Expanding JRE to .java ... (0.8s)
2015-04-10T15:24:52.82-0400 [STG]     OUT -----> Retrieving App Management Agent 2015.03.09_101422 (com.ibm.ws.cloudoe.app-mgmt-proxy-agent.zip) ... (0.0s)
2015-04-10T15:24:52.92-0400 [STG]     OUT          Expanding App Management to .app-management (0.0s)
2015-04-10T15:24:52.92-0400 [STG]     OUT -----> Retrieving com.ibm.ws.liberty-2015.3.0.0-201504021422.tar.gz ... (0.0s)
2015-04-10T15:24:53.74-0400 [STG]     OUT          Installing archive ... (0.8s)
2015-04-10T15:24:53.76-0400 [STG]     OUT -----> Retrieving com.ibm.ws.liberty.ext-2015.3.0.0-201504021422.tar.gz ... (0.0s)
2015-04-10T15:24:54.15-0400 [STG]     OUT          Installing archive ... (0.3s)
2015-04-10T15:24:54.33-0400 [STG]     OUT -----> Retrieving and installing client jar(s) from com.ibm.ws.icap.clientJars.cloudant.zip (0.1s)
2015-04-10T15:24:54.34-0400 [STG]     OUT -----> Auto-configuration is creating config for service instance 'Cloudant NoSQL DB-wr' of type 'cloudantNoSQLDB'
2015-04-10T15:24:54.36-0400 [STG]     OUT -----> Liberty buildpack is done creating the droplet
2015-04-10T15:24:54.63-0400 [STG]     ERR 
2015-04-10T15:25:06.80-0400 [STG]     OUT -----> Uploading droplet (147M)

buildpacks寻找的是绑定到您应用的服务。如果存在绑定服务（如Cloudant或Monitoring and Analytics），则会添加正确的资源。对于Cloudant，因为它是JDBC，它将为您创建JDBC连接。

此外，Liberty buildpack还为以下服务类型提供自动配置：SQL Database ClearDB MySQL数据库MySQL ElephantSQL PostgreSQL Cloudant™NoSQL数据库MongoLab dashDB数据缓存会话缓存MQ光监控和分析自动扩展单一登录新文件

BlueMix如何在部署期间执行自动装配？

1 个答案: