在 MobileFirst Foundation 中使用底层 Java EE 资源

Question

Looking at the Java Adapter documentation and samples , I don't see any examples of delegating like DataSource configuration to the underlying Java EE server. Instead things like Driver and authentication are in Adapter properties. Is using Java EE Resources a supported pattern?

It definitely seems non-ideal and tedious to have to manage resource details within each adapter, especially if multiple adapters might use the same resources. Not to mention potentially having sensitive properties in adapter configuration files.

Or is the idea that the people managing these things will know nothing about the Java EE server, and instead only know how to use the MFP console?

Answer 1

It definitely seems non-ideal and tedious to have to manage resource details within each adapter, especially if multiple adapters might use the same resources.

In MobileFirst Foundation 8.0 there are ways to manage such configurations using either Maven commands or CLI commands to pull and push configurations to adapters across different environments, and as you say, there is a web UI to handle it, too.

Read more here: https://mobilefirstplatform.ibmcloud.com/blog/2017/01/03/tools-for-devops-flows-with-mobilefirst-foundation/

Or is the idea that the people managing these things will know nothing about the Java EE server, and instead only know how to use the MFP console?

As with the previous paragraph, there are tools to handle it.

That said, it is true that nothing is written about it at this time.
Please feel free to contact your IBM representative to see if something can be done about it.

Answer 2

I have been able to do this in my Java EE server (WebSphere Liberty). Described in a blog post , recreated here.

Define the JNDI DataSource in your Java EE server. (eg Configuring relational database connectivity in Liberty )

Put the JNDI name itself in Adapter configuration parameters:

<property name="dataSource.jndiName" 
          displayName="DataSource JNDI Name" defaultValue="jdbc/myDataSource"/>

In your adapter Java code, use the following simple code to obtain that DataSource:

    try {
        javax.naming.InitialContext ctx = new javax.naming.InitialContext();
        this.dataSource = (javax.sql.DataSource) ctx.lookup(dataSourceJndiName);
    }
    catch (javax.naming.NamingException e) {
        throw new RuntimeException(
            "Unable to locate specified DataSource: " + dataSourceJndiName);
    }

Where dataSourceJndiName is obtained from the MobileFirst ConfigurationAPI :

configApi.getPropertyValue("dataSource.jndiName");