RestController

Implements: IConfigurable, IReferenceable, IOpenable, IUnreferenceable, IRegisterable

Description

The RestController class allows you to create REST services that receive remote calls via the HTTP/REST protocol.

Configuration parameters

• base_route: base route for remote URI
• dependencies:
  • endpoint: override for HTTP Endpoint dependency
  • controller: override for Controller dependency
• connection(s):
  • discovery_key: (optional) key to retrieve the connection from IDiscovery
  • protocol: connection protocol (http or https)
  • host: host name or IP address
  • port: port number
  • uri: resource URI or connection string with all parameters in it
• credential: the HTTPS credentials:
  • ssl_key_file: SSL private key in PEM
  • ssl_crt_file: SSL certificate in PEM
  • ssl_ca_file: certificate authorities (root cerfiticates) in PEM

References

• *:logger:*:*:1.0 - (optional) ILogger components to pass log messages
• *:counters:*:*:1.0 - (optional) ICounters components to pass collected measurements
• *:traces:*:*:1.0 - (optional) ITracer components to record traces
• *:discovery:*:*:1.0 - (optional) IDiscovery services to resolve connection
• *:endpoint:http:*:1.0 - (optional) HttpEndpoint reference

Fields

Instance methods

close

Closes a component and frees used resources.

public void close(IContext context) throws ApplicationException

• context: IContext - (optional) a context to trace execution through a call chain.

configure

Configures a component by passing its configuration parameters.

public void configure(ConfigParams config) throws ConfigException

• config: ConfigParams - configuration parameters, containing a “connection(s)” section.

getTraceId

Returns trace(correlation) ID from a request

protected gString getTraceId(ContainerRequestContext req)

• req: ContainerRequestContext - an HTTP request
• returns: String - the trace(correlation) ID from request.

instrument

Adds instrumentation to log calls and measure call time. It returns a Timing object that is used to end the time measurement.

protected InstrumentTiming instrument(IContext context, String name)

• context: IContext - (optional) a context to trace execution through a call chain.
• name: String - method name.
• returns: InstrumentTiming - InstrumentTiming object to end the time measurement.

isOpen

Checks if the component is open.

public boolean isOpen()

• returns: boolean - True if the component has been opened and False otherwise.

open

Opens the component.

public void open(IContext context) throws ApplicationException

• context: IContext - (optional) a context to trace execution through a call chain.

registerInterceptor

Registers a middleware for a given route in HTTP endpoint.

protected void registerInterceptor(String route, Function<ContainerRequestContext, ?> action)

• route: String - command route. Base route will be added to this route
• action: Function<ContainerRequestContext, ?> - action function that is called when middleware is invoked.

registerOpenApiSpec

Registers the open api spec.

protected void registerOpenApiSpec(String content)

• content: String - response header content

registerOpenApiSpecFromFile

Registers the open api spec from a file.

protected void registerOpenApiSpecFromFile(String path)

• path: String - path to the file

registerRoute

Registers a route in HTTP endpoint.

protected void registerRoute(String method, String route, Schema schema, Inflector<ContainerRequestContext, Response> action)

• method: string - HTTP method: “get”, “head”, “post”, “put”, “delete”
• route: string - command route. The base route will be added to this route
• schema: Schema - validation schema to validate received parameters.
• action: Inflector<ContainerRequestContext, Response> - action function that is called when an operation is invoked.

registerRouteWithAuth

Registers a route with authorization in HTTP endpoint.

protected void registerRouteWithAuth(String method, String route, Schema schema, AuthorizeFunction<ContainerRequestContext, Inflector<ContainerRequestContext, Response>, Response> authorize, Inflector<ContainerRequestContext, Response> action)

• method: String - HTTP method: “get”, “head”, “post”, “put”, “delete”
• route: String - command route. The base route will be added to this route
• schema: Schema - validation schema to validate received parameters.
• authorize: AuthorizeFunction<ContainerRequestContext, Inflector<ContainerRequestContext, Response>, Response> - authorization interceptor
• action: Inflector<ContainerRequestContext, Response> - action function that is called when an operation is invoked.

sendCreatedResult

Creates a callback function that sends a newly created object as JSON. The callack function call be called directly or passed as a parameter to business logic components.

If the object is not null, it returns 200 status code. For null results it returns 204 status code. If an error occurs, it sends ErrorDescription with the approproate status code.

protected Response sendCreatedResult(Object result)

• result: Object - an execution result
• returns: Response - response.

sendDeletedResult

Creates a callback function that sends deleted object as JSON. That callack function call be called directly or passed as a parameter to business logic components.

If object is not null it returns 200 status code. For null results it returns 204 status code. If error occur it sends ErrorDescription with approproate status code.

protected Response sendDeletedResult(Object result)

• result: Object - an execution result
• returns: Response - response.

sendError

Sends an error serialized as ErrorDescription object and the appropriate HTTP status code. If status code is not defined, it uses 500 status code.

protected Response sendError(Exception ex)

• ex: Exception - exception
• returns: Response - response

sendResult

Creates a callback function that sends a result as a JSON object. The callack function call be called directly or passed as a parameter to business logic components.

If the object is not null it returns 200 status code. For null results, it returns 204 status code. If an error occurs, it sends ErrorDescription with the approproate status code.

protected Response sendResult(Object result)

• result: Object - an execution result
• returns: Response - response.

setReferences

Sets references to dependent components.

public void setReferences(IReferences references) throws ReferenceException, ConfigException

• references: IReferences - references to locate the component dependencies.

unsetReferences

Unsets (clears) previously set references to dependent components.

publicvoid unsetReferences()

Abstract methods

register

Registers all service routes in a HTTP endpoint.

This method is called by the service and must be overriden in child classes.

public abstract void register() throws ReferenceException

Examples

{@code
  class MyRestController extends RestController {
     private IMyService _service;
     ...
     public MyRestController() {
        super();
        this._dependencyResolver.put(
            "service",
            new Descriptor("mygroup","service","*","*","1.0")
        );
     }
 
     public void setReferences(IReferences references) {
        super.setReferences(references);
        this._service = (IMyService)this._dependencyResolver.getRequired("service");
     }
 
     public void register() {
     this.registerRoute(
                  HttpMethod.GET, "/get_mydata",
                  null,
                  this::getData
          );
         ...
     }
 
     private Response getData(ContainerRequestContext req) {
          ...
         }
  }
 
  MyRestController controller = new MyRestController();
  controller.configure(ConfigParams.fromTuples(
      "connection.protocol", "http",
      "connection.host", "localhost",
      "connection.port", 8080
  ));
  controller.setReferences(References.fromTuples(
     new Descriptor("mygroup","service","default","default","1.0"), service
  ));
 
  controller.open("123");
  System.out.println("The REST controller is running on port 8080");
  }

See also

• RestClient