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| <h1>Concepts |
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| <p>OpenEJB was founded on the idea that it would be embedded into third-party |
| environments whom would likely already have three things:</p> |
| |
| <ul> |
| <li>their one "server" platform with existing clients and protocols</li> |
| <li>their own way to configure their platform</li> |
| <li>existing services like TransactionManager, Security, and Connector</li> |
| </ul> |
| |
| <p>Thus the focus of OpenEJB was to create an EJB implementation that would be |
| easily embeddible, configurable, and customizable. </p> |
| |
| <p>Part of achieving that is a drive to be as simple as possible as to not |
| over-define and therefore restrict the ability to be embeddible, |
| configurable and customizable. Smaller third-party environments could |
| easily 'downscale' OpenEJB in their integrations by replacing standard |
| components with lighter implementations or removing them all together and |
| larger environments could 'upscale' OpenEJB by replacing and adding heavier |
| implementations of those standard components likely tailored to their |
| systems and infrastructure.</p> |
| |
| <p>Container and Server are mentioned in the EJB spec as being separate things |
| but are never defined formally. In our world Containers, which implement |
| the basic component contract and lifecycle of a bean are not coupled to any |
| particular Server, which has the job of providing a naming service and |
| providing a way for it's clients to reference and invoke components (beans) |
| hosted in Containers. Because Containers have no dependence at all only |
| Server, you can run OpenEJB without any Server at all in an embedded |
| environment for example without any work or any extra overhead. Similarly |
| you can add as many new Server components as you want without ever having |
| to modify any Containers.</p> |
| |
| <p>There is a very strong pluggability focus in OpenEJB as it was always |
| intended to be embedded and customized in other environments. As a result |
| all Containers are pluggable, isolated from each other, and no one |
| Container is bound to another Container and therefore removing or adding a |
| Container has no repercussions on the other Containers in the system. |
| TransactionManager, SecurityService and Connector also pluggable and are |
| services exposed to Containers. A Container may not be dependent on |
| specific implementations of those services. Service Providers define what |
| services they are offering (Container, Connector, Security, Transaction, |
| etc.) in a file they place in their jar called service-jar.xml. </p> |
| |
| <p>The service-jar.xml should be placed not in the META-INF but somewhere in |
| your package hierarchy (ours is in /org/apache/openejb/service-jar.xml) |
| which allows the services in your service-jar.xml to be referenced by name |
| (such as DefaultStatefulContainer) or more specifically by package and id |
| (such as org.apache.openejb#DefaultStatefulContainer). </p> |
| |
| <p>The same implementation of a service can be declared several times in a |
| service-jar.xml with different ids. This allows for you to setup several |
| several different profiles or pre-configured versions of the services you |
| provide each with a different name and different set of default values for |
| its properties. </p> |
| |
| <p>In your openejb.conf file when you declare Containers and Connectors, we |
| are actually hooking you up with Service Providers automatically. You get |
| what is in the org/apache/openejb/service-jar.xml by default, but you are |
| able to point specifically to a specific Service Provider by the 'provider' |
| attribute on the Container, Connector, TransactionManager, SecurityService, |
| etc. elements of the openejb.conf file. When you declare a service |
| (Container, Connector, etc.) in your openejb.conf file the properties you |
| supply override the properties supplied by the Service Provider, thus you |
| only need to specify the properties you'd like to change and can have your |
| openejb.conf file as large or as small as you would like it. The act of |
| doing this can be thought of as essentially instantiating the Service |
| Provider and configuring that instance for inclusion in the runtime system. </p> |
| |
| <p>For example Container(id=NoTimeoutStatefulContainer, |
| provider=DefaultStatefulContainer) could be declared with it's Timeout |
| property set to 0 for never, and a |
| Container(id=ShortTimeoutStatefulContainer, |
| provider=DefaultStatefulContainer) could be declared with it's Timeout |
| property set to 15 minutes. Both would be instances of the |
| DefaultStatefulContainer Service Provider which is a service of type |
| Container.</p> |
| |
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