Q: My component needs some configuration. Instead of using environment variables, or config files on disk, I want to put the information into the CDB.

The CDB is certainly the natural place to put proprietary information for components. You need to do the following steps.

1. Add a schema to the CDB

Create a schema like the following under $ACS_CDB/CDB/schemas/MYCOMP_CONFIG.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema 
  targetNamespace="urn:schemas-cosylab-com:MYCOMP_CONFIG:1.0"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns="urn:schemas-cosylab-com:MYCOMP_CONFIG:1.0"
  xmlns:cdb="urn:schemas-cosylab-com:CDB:1.0">

  <xs:import namespace="urn:schemas-cosylab-com:CDB:1.0" schemaLocation="CDB.xsd"/>

    <xs:complexType name="MYCOMP_CONFIG">
      <xs:attribute name="fileDir" type="xs:string"  use="required" />
      <xs:attribute name="nLogs" type="xs:integer" use="optional" default="20"   />
    </xs:complexType>

  <xs:element name="MYCOMP_CONFIG" type="MYCOMP_CONFIG"/>
</xs:schema>

2. Add your config to the CDB

Create a file like the following under $ACS_CDB/CDB/alma/MYCOMP_CONFIG/MYCOMP_CONFIG.xml

<?xml version="1.0" encoding="UTF-8"?>
<MYCOMP_CONFIG xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns="urn:schemas-cosylab-com:MYCOMP_CONFIG:1.0"
  fileDir="/mnt/var"
  nLogs="200"
/>

3. Sample code (in Java) to read the custom config:

Use code like this in your component:

String mycomp = "MYCOMP";
// or use: String mycomp = containerservices.getName();
DAL dal = containerservices.getCDB();
DAO dao = dal.get_DAO_Servant("alma/" + myname + "_CONFIG");
String fileDir = dao.get_string("fileDir");
short nLogs = (short) dao.get_long("nLogs");