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| |
| Child Resources |
| |
| <p> |
| When using the <ja>@JuneauRestRoot</ja> annotation, servlet are given an instance of {@link oajr.springboot.SpringRestResourceResolver}. |
| The resource resolver gets passed down through the children hierarchy, allowing child resources to be defined as injectable Spring beans. |
| </p> |
| <h5 class='figure'>Example:</h5> |
| <p class='bpcode w800'> |
| <ja>@Configuration</ja> |
| <jk>public class</jk> AppConfiguration { |
| |
| <ja>@Bean @JuneauRestRoot</ja> |
| <jk>public</jk> RootResource getRootResource() { |
| <jk>return new</jk> RootResource(); |
| } |
| |
| <ja>@Bean</ja> |
| <jk>public</jk> ChildResource getChildResource() { |
| <jk>return new</jk> ChildResource(); |
| } |
| |
| <ja>@Bean</ja> |
| <jk>public</jk> GrandChildResource getGrandChildResource() { |
| <jk>return new</jk> GrandChildResource(); |
| } |
| } |
| </p> |
| <p> |
| The root resource class must extend from <c>HttpServlet</c> so that it can be registered as a normal |
| servlet using the Spring Boot architecture. The {@link oajr.BasicRestServletGroup} class is our router class |
| that extends from <c>HttpServlet</c>: |
| </p> |
| <p class='bpcode w800'> |
| <ja>@Rest</ja>( |
| path=<js>"/root"</js>, |
| children={ |
| ChildResource.<jk>class</jk> |
| } |
| ) |
| <jk>public class</jk> RootResource <jk>extends</jk> BasicRestServletGroup { |
| <jc>// No code needed.</jc> |
| } |
| </p> |
| <p> |
| Because Spring Boot will automatically register any beans that extend from <c>HttpServlet</c>, we |
| DON'T want the child classes to extend from <c>HttpServlet</c>. Instead, we extend from |
| {@link oajr.BasicRestGroup} and {@link oajr.BasicRest} instead: |
| </p> |
| |
| <p class='bpcode w800'> |
| <ja>@Rest</ja>( |
| path=<js>"/child"</js>, |
| children={ |
| GrandChildResource.<jk>class</jk> |
| } |
| ) |
| <jk>public class</jk> ChildResource <jk>extends</jk> BasicRestGroup { |
| <jc>// No code needed.</jc> |
| } |
| </p> |
| <p class='bpcode w800'> |
| <ja>@Rest</ja>( |
| path=<js>"/grandchild"</js> |
| ) |
| <jk>public class</jk> GrandChildResource <jk>extends</jk> BasicRest { |
| <jc>// Injectable bean</jc> |
| } |
| </p> |