红帽全球峰会此内容没有您所选择的语言版本。
10.4. Client, User, and Server Usage and Implementation Details
These features hide the implementation details, making the usage less error-prone, while at the same time streamlining the development process.
The goal is for clients to only see a Deployment API, while developers see a DeploymentUnit, and server implementation details are contained in a DeploymentContext. Only the necessary information is exposed to a particular level of deployment's lifecycle.
Components have already been mentioned as part of deployers' hierarchy handling. While top level deployment and sub-deployments are a natural representation of the deployment's structure hierarchy, components are a new VDF concept. The idea of components is that they have a 1:1 mapping with the
ControllerContexts inside the Microcontainer. See Why Components Map 1:1 with the ControllerContexts for the reasons behind this assertion.
Why Components Map 1:1 with the ControllerContexts
- Naming
- The component unit's name is the same as the
ControllerContext's name. - get*Scope() and get*MetaData()
- return the same MDR context that will be used by the Microcontainer for that instance.
- IncompleteDeploymentException (IDE)
- In order for the IDE to print out what dependencies are missing for a deployment, it needs to know the ControllerContext names. It discovers the name by collecting the Component DeploymentUnit's names in Component Deployers that specify them, such as
BeanMetaDataDeployeror thesetUseUnitName()method inAbstractRealDeployer.
'%20d='M201.5%20305.5c-13.8%200-24.9-11.1-24.9-24.6%200-13.8%2011.1-24.9%2024.9-24.9%2013.6%200%2024.6%2011.1%2024.6%2024.9%200%2013.6-11.1%2024.6-24.6%2024.6zM504%20256c0%20137-111%20248-248%20248S8%20393%208%20256%20119%208%20256%208s248%20111%20248%20248zm-132.3-41.2c-9.4%200-17.7%203.9-23.8%2010-22.4-15.5-52.6-25.5-86.1-26.6l17.4-78.3%2055.4%2012.5c0%2013.6%2011.1%2024.6%2024.6%2024.6%2013.8%200%2024.9-11.3%2024.9-24.9s-11.1-24.9-24.9-24.9c-9.7%200-18%205.8-22.1%2013.8l-61.2-13.6c-3-.8-6.1%201.4-6.9%204.4l-19.1%2086.4c-33.2%201.4-63.1%2011.3-85.5%2026.8-6.1-6.4-14.7-10.2-24.1-10.2-34.9%200-46.3%2046.9-14.4%2062.8-1.1%205-1.7%2010.2-1.7%2015.5%200%2052.6%2059.2%2095.2%20132%2095.2%2073.1%200%20132.3-42.6%20132.3-95.2%200-5.3-.6-10.8-1.9-15.8%2031.3-16%2019.8-62.5-14.9-62.5zM302.8%20331c-18.2%2018.2-76.1%2017.9-93.6%200-2.2-2.2-6.1-2.2-8.3%200-2.5%202.5-2.5%206.4%200%208.6%2022.8%2022.8%2087.3%2022.8%20110.2%200%202.5-2.2%202.5-6.1%200-8.6-2.2-2.2-6.1-2.2-8.3%200zm7.7-75c-13.6%200-24.6%2011.1-24.6%2024.9%200%2013.6%2011.1%2024.6%2024.6%2024.6%2013.8%200%2024.9-11.1%2024.9-24.6%200-13.8-11-24.9-24.9-24.9z'/%3e%3c/svg%3e){kind=small}