org.forgerock.json.resource

Class Router

java.lang.Object

org.forgerock.services.routing.AbstractRouter<Router,Request,RequestHandler,ApiDescription>

org.forgerock.json.resource.Router

All Implemented Interfaces:

RequestHandler, Describable<ApiDescription,Request>, Describable.Listener

public class Router
extends AbstractRouter<Router,Request,RequestHandler,ApiDescription>
implements RequestHandler

A router which routes requests based on route predicates. Each route is comprised of a route matcher and a corresponding handler, when routing a request the router will call RouteMatcher.evaluate(org.forgerock.services.context.Context, R) for each registered route and use the returned RouteMatcher to determine which route best matches the request.

Routes may be added and removed from a router as follows:

 Handler users = ...;
 Router router = new Router();
 RouteMatcher routeOne = RouteMatchers.requestUriMatcher(EQUALS, "users");
 RouteMatcher routeTwo = RouteMatchers.requestUriMatcher(EQUALS, "users/{userId}");
 router.addRoute(routeOne, users);
 router.addRoute(routeTwo, users);

 // Deregister a route.
 router.removeRoute(routeOne, routeTwo);
 

See Also:

AbstractRouter, RouteMatchers

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Router.UriTemplate Represents a URI template string that will be used to match and route incoming requests.

Nested classes/interfaces inherited from interface org.forgerock.services.descriptor.Describable

Describable.Listener

Field Summary

Fields inherited from class org.forgerock.services.routing.AbstractRouter

api, thisRouterUriMatcher

Constructor Summary

Constructors

Constructor and Description
Router() Creates a new router with no routes defined.
Router(AbstractRouter<Router,Request,RequestHandler,ApiDescription> router) Creates a new router containing the same routes and default route as the provided router.

Method Summary

Modifier and Type	Method and Description
RouteMatcher<Request>	addRoute(Router.UriTemplate uriTemplate, CollectionResourceProvider provider) Adds a new route to this router for the provided collection resource provider.
RouteMatcher<Request>	addRoute(Router.UriTemplate uriTemplate, SingletonResourceProvider provider) Adds a new route to this router for the provided singleton resource provider.
RouteMatcher<Request>	addRoute(RoutingMode mode, Router.UriTemplate uriTemplate, RequestHandler handler) Adds a new route to this router for the provided request handler.
RouteMatcher<Request>	addRoute(Version version, CollectionResourceProvider provider) Adds a new route to this router for the provided collection resource provider.
RouteMatcher<Request>	addRoute(Version version, RequestHandler handler) Adds a new route to this router for the provided request handler.
RouteMatcher<Request>	addRoute(Version version, SingletonResourceProvider provider) Adds a new route to this router for the provided singleton resource provider.
protected Pair<RouteMatcher<Request>,RequestHandler>	getSelfApiHandler() Return a Describable handler that returns this AbstractRouter's internal api description from the Describable.handleApiRequest(Context, Object) method.
protected Router	getThis() Returns this AbstractRouter instance, typed correctly.
Promise<ActionResponse,ResourceException>	handleAction(Context context, ActionRequest request) Handles performing an action on a resource, and optionally returns an associated result.
ApiDescription	handleApiRequest(Context context, Request request) Handle a request for the API Descriptor.
Promise<ResourceResponse,ResourceException>	handleCreate(Context context, CreateRequest request) Adds a new JSON resource, returning a Promise that will be completed when the resource has been added.
Promise<ResourceResponse,ResourceException>	handleDelete(Context context, DeleteRequest request) Deletes a JSON resource, returning a Promise that will be completed when the resource has been deleted.
Promise<ResourceResponse,ResourceException>	handlePatch(Context context, PatchRequest request) Updates a JSON resource by applying a set of changes to its existing content, returning a Promise that will be completed when the resource has been updated.
Promise<QueryResponse,ResourceException>	handleQuery(Context context, QueryRequest request, QueryResourceHandler handler) Searches for all JSON resources matching a user specified set of criteria, returning a Promise that will be completed when the search has completed.
Promise<ResourceResponse,ResourceException>	handleRead(Context context, ReadRequest request) Reads a JSON resource, returning a Promise that will be completed when the resource has been read.
Promise<ResourceResponse,ResourceException>	handleUpdate(Context context, UpdateRequest request) Updates a JSON resource by replacing its existing content with new content, returning a Promise that will be completed when the resource has been updated.
protected RouteMatcher<Request>	uriMatcher(RoutingMode mode, String pattern) Create a URI matcher suitable for the request type <R>.
static Router.UriTemplate	uriTemplate(String template) Creates a Router.UriTemplate from a URI template string that will be used to match and route incoming requests.

Methods inherited from class org.forgerock.services.routing.AbstractRouter

addAllRoutes, addDescriptorListener, addRoute, api, buildApi, getBestApiRoute, getBestRoute, getRoutes, notifyDescriptorChange, removeAllRoutes, removeDescriptorListener, removeRoute, setDefaultRoute

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Router

public Router()

Creates a new router with no routes defined.

Router

public Router(AbstractRouter<Router,Request,RequestHandler,ApiDescription> router)

Creates a new router containing the same routes and default route as the provided router. Changes to the returned router's routing table will not impact the provided router.

Parameters:

router - The router to be copied.

Method Detail

getThis

protected Router getThis()

Description copied from class: AbstractRouter

Returns this AbstractRouter instance, typed correctly.

Specified by:

getThis in class AbstractRouter<Router,Request,RequestHandler,ApiDescription>

Returns:

This AbstractRouter instance.

uriMatcher

protected RouteMatcher<Request> uriMatcher(RoutingMode mode,
                                           String pattern)

Description copied from class: AbstractRouter

Create a URI matcher suitable for the request type <R>.

Specified by:

uriMatcher in class AbstractRouter<Router,Request,RequestHandler,ApiDescription>

Parameters:

mode - The routing mode.

pattern - The pattern.

Returns:

The matcher.

addRoute

public RouteMatcher<Request> addRoute(Router.UriTemplate uriTemplate,
                                      CollectionResourceProvider provider)

Adds a new route to this router for the provided collection resource provider. New routes may be added while this router is processing requests.

The provided URI template must match the resource collection itself, not resource instances. For example:

 CollectionResourceProvider users = ...;
 Router router = new Router();

 // This is valid usage: the template matches the resource collection.
 router.addRoute(Router.uriTemplate("users"), users);

 // This is invalid usage: the template matches resource instances.
 router.addRoute(Router.uriTemplate("users/{userId}"), users);
 

Parameters:

uriTemplate - The URI template which request resource names must match.

provider - The collection resource provider to which matching requests will be routed.

Returns:

The RouteMatcher for the route that can be used to remove the route at a later point.

addRoute

public RouteMatcher<Request> addRoute(Router.UriTemplate uriTemplate,
                                      SingletonResourceProvider provider)

Adds a new route to this router for the provided singleton resource provider. New routes may be added while this router is processing requests.

Parameters:

uriTemplate - The URI template which request resource names must match.

provider - The singleton resource provider to which matching requests will be routed.

Returns:

The RouteMatcher for the route that can be used to remove the route at a later point.

addRoute

public RouteMatcher<Request> addRoute(RoutingMode mode,
                                      Router.UriTemplate uriTemplate,
                                      RequestHandler handler)

Adds a new route to this router for the provided request handler. New routes may be added while this router is processing requests.

Parameters:

mode - Indicates how the URI template should be matched against resource names.

uriTemplate - The URI template which request resource names must match.

handler - The request handler to which matching requests will be routed.

Returns:

The RouteMatcher for the route that can be used to remove the route at a later point.

uriTemplate

public static Router.UriTemplate uriTemplate(String template)

Creates a Router.UriTemplate from a URI template string that will be used to match and route incoming requests.

Parameters:

template - The URI template.

Returns:

A UriTemplate instance.

addRoute

public RouteMatcher<Request> addRoute(Version version,
                                      CollectionResourceProvider provider)

Adds a new route to this router for the provided collection resource provider. New routes may be added while this router is processing requests.

Parameters:

version - The resource API version the the request must match.

provider - The collection resource provider to which matching requests will be routed.

Returns:

The RouteMatcher for the route that can be used to remove the route at a later point.

addRoute

public RouteMatcher<Request> addRoute(Version version,
                                      SingletonResourceProvider provider)

Adds a new route to this router for the provided singleton resource provider. New routes may be added while this router is processing requests.

Parameters:

version - The resource API version the the request must match.

provider - The singleton resource provider to which matching requests will be routed.

Returns:

The RouteMatcher for the route that can be used to remove the route at a later point.

addRoute

public RouteMatcher<Request> addRoute(Version version,
                                      RequestHandler handler)

Adds a new route to this router for the provided request handler. New routes may be added while this router is processing requests.

Parameters:

version - The resource API version the the request must match.

handler - The request handler to which matching requests will be routed.

Returns:

The RouteMatcher for the route that can be used to remove the route at a later point.

handleAction

public Promise<ActionResponse,ResourceException> handleAction(Context context,
                                                              ActionRequest request)

Description copied from interface: RequestHandler

Handles performing an action on a resource, and optionally returns an associated result. The execution of an action is allowed to incur side effects.

Actions are parametric; a set of named parameters is provided as input to the action. The action result is a JSON object structure composed of basic Java types; its overall structure is defined by a specific implementation.

On completion, the action result (or null) must be used to complete the returned Promise. On failure, the returned Promise must be completed with the exception.

Action expects failure exceptions as follows: ForbiddenException if access to the resource is forbidden. NotSupportedException if the requested functionality is not implemented/supported BadRequestException if the passed identifier, parameters or filter is invalid NotFoundException if the specified resource could not be found.

Specified by:

handleAction in interface RequestHandler

Parameters:

context - The request server context, such as associated principal.

request - The action request.

Returns:

A Promise containing the result of the operation.

handleCreate

public Promise<ResourceResponse,ResourceException> handleCreate(Context context,
                                                                CreateRequest request)

Description copied from interface: RequestHandler

Adds a new JSON resource, returning a Promise that will be completed when the resource has been added.

Create expects failure exceptions as follows:

• ForbiddenException if access to the resource is forbidden.
• NotSupportedException if the requested functionality is not implemented/supported
• PreconditionFailedException if a resource with the same ID already exists
• BadRequestException if the passed identifier or value is invalid
• NotFoundException if the specified id could not be resolved, for example when an intermediate resource in the hierarchy does not exist.

Specified by:

handleCreate in interface RequestHandler

Parameters:

context - The request server context, such as associated principal.

request - The create request.

Returns:

A Promise containing the result of the operation.

handleDelete

public Promise<ResourceResponse,ResourceException> handleDelete(Context context,
                                                                DeleteRequest request)

Description copied from interface: RequestHandler

Deletes a JSON resource, returning a Promise that will be completed when the resource has been deleted.

Delete expects failure exceptions as follows:

• ForbiddenException if access to the resource is forbidden
• NotSupportedException if the requested functionality is not implemented/supported
• BadRequestException if the passed identifier is invalid
• NotFoundException if the specified resource could not be found
• PreconditionRequiredException if version is required, but is null
• PreconditionFailedException if version did not match the existing resource.

Specified by:

handleDelete in interface RequestHandler

Parameters:

context - The request server context, such as associated principal.

request - The delete request.

Returns:

A Promise containing the result of the operation.

handlePatch

public Promise<ResourceResponse,ResourceException> handlePatch(Context context,
                                                               PatchRequest request)

Description copied from interface: RequestHandler

Updates a JSON resource by applying a set of changes to its existing content, returning a Promise that will be completed when the resource has been updated.

Patch expects failure exceptions as follows:

• ForbiddenException if access to the resource is forbidden
• NotSupportedException if the requested functionality is not implemented/supported
• PreconditionRequiredException if version is required, but is null
• PreconditionFailedException if version did not match the existing resource
• BadRequestException if the passed identifier or filter is invalid
• NotFoundException if the specified resource could not be found
• ConflictException if patch could not be applied for the given resource state.

Specified by:

handlePatch in interface RequestHandler

Parameters:

context - The request server context, such as associated principal.

request - The patch request.

Returns:

A Promise containing the result of the operation.

handleQuery

public Promise<QueryResponse,ResourceException> handleQuery(Context context,
                                                            QueryRequest request,
                                                            QueryResourceHandler handler)

Description copied from interface: RequestHandler

Searches for all JSON resources matching a user specified set of criteria, returning a Promise that will be completed when the search has completed.

Implementations must invoke QueryResourceHandler.handleResource(ResourceResponse) for each resource which matches the query criteria. Once all matching resources have been returned implementations are required to return either a QueryResponse if the query has completed successfully, or ResourceException if the query did not complete successfully (even if some matching resources were returned).

Query expects failure exceptions as follows:

• ForbiddenException if access to the resource is forbidden
• NotSupportedException if the requested functionality is not implemented/supported
• BadRequestException if the passed identifier, parameters or filter is invalid
• NotFoundException if the specified resource could not be found

Specified by:

handleQuery in interface RequestHandler

Parameters:

context - The request server context, such as associated principal.

request - The query request.

handler - The query resource handler to be notified for each matching resource.

Returns:

A Promise containing the result of the operation.

handleRead

public Promise<ResourceResponse,ResourceException> handleRead(Context context,
                                                              ReadRequest request)

Description copied from interface: RequestHandler

Reads a JSON resource, returning a Promise that will be completed when the resource has been read.

Read expects failure exceptions as follows:

• ForbiddenException if access to the resource is forbidden.
• NotSupportedException if the requested functionality is not implemented/supported
• BadRequestException if the passed identifier or filter is invalid
• NotFoundException if the specified resource could not be found.

Specified by:

handleRead in interface RequestHandler

Parameters:

context - The request server context, such as associated principal.

request - The read request.

Returns:

A Promise containing the result of the operation.

handleUpdate

public Promise<ResourceResponse,ResourceException> handleUpdate(Context context,
                                                                UpdateRequest request)

Description copied from interface: RequestHandler

Updates a JSON resource by replacing its existing content with new content, returning a Promise that will be completed when the resource has been updated.

Update expects failure the following failure exceptions:

• ForbiddenException if access to the resource is forbidden
• NotSupportedException if the requested functionality is not implemented/supported
• PreconditionRequiredException if version is required, but is null
• PreconditionFailedException if version did not match the existing resource
• BadRequestException if the passed identifier or filter is invalid
• NotFoundException if the specified resource could not be found.

Specified by:

handleUpdate in interface RequestHandler

Parameters:

context - The request server context, such as associated principal.

request - The update request.

Returns:

A Promise containing the result of the operation.

handleApiRequest

public ApiDescription handleApiRequest(Context context,
                                       Request request)

Description copied from interface: Describable

Handle a request for the API Descriptor. This method should not do any computation, but should return the already computed descriptor.

Specified by:

handleApiRequest in interface Describable<ApiDescription,Request>

Overrides:

handleApiRequest in class AbstractRouter<Router,Request,RequestHandler,ApiDescription>

Parameters:

context - The request context.

request - The request.

Returns:

The descriptor.

getSelfApiHandler

protected Pair<RouteMatcher<Request>,RequestHandler> getSelfApiHandler()

Description copied from class: AbstractRouter

Return a Describable handler that returns this AbstractRouter's internal api description from the Describable.handleApiRequest(Context, Object) method. All other methods should throw an UnsupportedOperationException, as they should never be used.

Specified by:

getSelfApiHandler in class AbstractRouter<Router,Request,RequestHandler,ApiDescription>

Returns:

The describable handler.