Deployment Configuration:
Each application server is different and needs different
configuration data to deploy, configure and run applications.
The deployment configuration data helps in deploying and
configuring a J2EE application on the specified application
sever and the specified target platform it is intended for. This
job is done with the help of components called deployment
configuration components. These components are the bridges
between the tool provider and the product provider. The
components are designed as JavaBeans and need to adhere to the
JavaBean API specifications version 1.01. There are two
components needed for successful deployment and configuration,
they are the Deployment configuration beans and the Deployment
descriptor beans.
Deployment Configuration Beans:
Deployment configuration beans or config beans present to the
deployer the external dependencies that the application might
have. They are simple JavaBeans that allow deployment
information to be displayed as property sheets using a standard
Java editor. The J2EE provider provides the configuration data
for these properties in the Javabean. If no values are provided
default values are assumed. A config bean presents to a deployer
a logical grouping of deployment configuration information.
Config beans are represented as tree structures, the root of
which is a DConfigBeanRoot element. The nodes of the tree are
DConfigBean objects. A DConfigBean object is a bean used for
configuring a vendor specific deployment descriptor or a subset
of one. The DConfigBean has a number of methods which can be
used to configure deployment descriptors. I've listed a couple
below:
- getDConfigBean() gets the specific DConfigBean for a subset
of the given bean,
- getDDBean() gets the DBean that holds the
actual physical deployment descriptor that this DConfigBean is
trying to configure. A few other methods to get Xpath
information and property change listeners are also present.
All the DConfigBeans and their subsets are together grouped into
a DeploymentConfiguration object. An application(s) may have
multiple modules each of which may have their own deployment
descriptors and DConfigBeans. The DeploymentConfiguration object
which has all these DConfigBeans creates the deployment plan for
the application.
Deployment Descriptor Beans:
The Deployment descriptor beans or DD Beans are the components
used to read the data into a config bean based on the Xpath
string supplied. They read and extract the data from the
application's actual deployment descriptor files and store them
in the config beans. A DD bean can have multiple child DD beans.
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