BlueMix如何在部署期间执行自动装配？

Question

我下载了BlueMix Java样板，我正在使用它，考虑扩展其他表等等。我对在部署/运行时将BlueMix中的数据库服务链接到应用程序的‘自动连接’感到有点困惑。

在样板内部，persistence.xml中有一些配置内容如下：

<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/ from如何将已部署的服务映射到jta-数据源/持久化单元？

自动装配是否需要满足任何条件或要求？

Answer 1

其实挺酷的。在应用程序的部署过程中，buildpack允许您处理一些额外的逻辑。在中有一些逻辑，即在几个服务中自动连接。监控和分析，日志记录，仅举几个例子。节点buildpack也会这样做。

我已经捕捉到了下面的一些自动毛。

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)

构建包寻找的是绑定到应用程序的服务。如果有绑定服务，如Cloudant或监控和分析，它将添加正确的资源。对于Cloudant，因为它是JDBC，它将为您创建JDBC连接。

此外，自由构建包还为以下服务类型提供了自动配置: SQL数据库ClearDB MySQL数据库MySQL ElephantSQL PostgreSQL Cloudant™NoSQL数据库MongoLab dashDB数据缓存会话缓存MQ光监视和分析新文物上的自动缩放单标牌