tRESTRequest properties - 6.1

Talend Open Studio for Big Data Components Reference Guide

EnrichVersion
6.1
EnrichProdName
Talend Open Studio for Big Data
task
Data Governance
Data Quality and Preparation
Design and Development
EnrichPlatform
Talend Studio

Warning

This component is available only to users of Talend Studio with ESB.

Component family

ESB/REST

 

Function

tRESTRequest is a server-side component which accepts the HTTP and/or HTTPS requests from the clients and support GET, POST, PUT, PATCH and DELETE HTTP methods.

Note

To enable the HTTPS support, you have to generate a keystore and add some HTTPS security configuration properties in the org.ops4j.pax.web.cfg file of your Runtime container before deploying the service on it. For more information, see the Talend ESB Container Administration Guide.

Purpose

This component allows you to receive GET/POST/PUT/PATCH/DELETE requests from the clients on the server end.

Basic settings

REST Endpoint

Fill this field with the URI location where REST-ful web service will be accessible for requests.

Note

If you want your service to be available on both HTTP and HTTPS, fill the field with a relative path.

 

REST API Mapping

Click the [+] button beneath the mapping table to add lines to specify HTTP request:

Output Flow: Click the [...] button to specify the name of an output flow and set the schema for that output flow in the dialog box afterwards.

The schema is not mandatory, so if you do not need to pass additional parameters to the tRESTRequest component, you can leave the schema empty. However, you will have to populate the schema if you have URI Path parameters set in the URI Pattern field or if you need to add optional request parameters such as URI Query, HTTP Header or Form parameters, to the URI specified in the REST Endpoint field.

Add a schema with the name body to get the request body of POST and PUT methods. It supports Document, String, and Byte[] types.

If you specify URI parameters in the output flow schema, you might need to define what type of parameter it is in the Comment field of the schema. By default, if you leave the Comment field empty, the parameter is considered as a Path parameter. Below is a list of supported Comment values:

  • empty or path corresponds to the default @PathParam,

  • query corresponds to @QueryParam,

  • form corresponds to @FormParam,

  • header corresponds to @HeaderParam.

  • matrix corresponds to @MatrixParam.

  • multipart corresponds to the CXF specific @Multipart, representing the request body. It can be used only with POST and PUT HTTP methods.

Note

We recommend you to set the default values of your optional parameters (Header, Query, Form). To do so, fill in the Default columns of the schema.

HTTP Verb: Select a HTTP method (GET/POST/PUT/PATCH/DELETE/OPTIONS/HEAD) from the list.

URI pattern: Fill this field with REST-ful URIs that describe the resource.

Consumes: Select the format type of the consume content that the component will use from XML or JSON, XML, JSON, Form, Multipart and Any in the list when the HTTP method is POST, PUT or PATCH.

Produces: When the HTTP method is GET, POST, PUT, PATCH, or DELETE, select the format type of the produce content that the component will use from XML or JSON, XML, JSON, HTML and Any, or select <oneway> in the list to accept one way requests.

Streaming: Select this check box to stream the response data by chunks so that the large volumes of data can be processed efficiently.

  Use Service Locator Select this check box to enable the Service Locator. It maintains the availability of the service to help meet demands and service level agreements (SLAs). Specify the Service namespace and the Service name in the corresponding fields.
  Use Service Activity Monitor Select this check box to enable the Service Activity Monitor. It captures events and stores this information to facilitate in-depth analysis of service activity and track-and-trace of messages throughout a business transaction. This can be used to analyze service response times, identify traffic patterns, perform root cause analysis and more.

 

Use Authentication (ESB runtime only)

Select this check box to enable the authentication option for the current service. Select from Basic HTTP and SAML Token. This option works in runtime only.

 

Use Business Correlation

Select this check box to enable the correlation option so that chained service calls will be grouped under the same correlation ID. tRESTRequest will extract the correlation ID from the request header and store it in the component variable for further use in the flow.

If this option is not enabled on the client side, a correlation ID will be generated automatically in tRESTRequest.

Advanced settings Log messages Select this check box to log the message exchange between the service provider and the consumer.
  Wrap JSON Request Select this check box to wrap the JSON request with a root element.
  Convert JSON values to String in responseSelect this check box to convert the JSON values to string format in the response.
  Service Locator Customer Properties This option appears when Use Service Locator is enabled in the Basic settings tab. Click [+] to add as many properties as needed to the table. Enter the name and the value of each property in the Property Name field and the Property Value field respectively to identify the service.
  Service Activity Customer Properties This option appears when Use Service Activity Monitor is enabled in the Basic settings tab. Click [+] to add as many properties as needed to the table. Enter the name and the value of each property in the Property Name field and the Property Value field respectively to identify the service.
 

tStatCatcher Statistics

Select this check box to gather the Job processing metadata at a Job level as well as at each component level.

Global Variables

NB_LINE: the number of rows processed. This is an After variable and it returns an integer.

URI: the URI of the REST request. This is a Flow variable and it returns a string.

URI_BASE: the base URI of the REST request. This is a Flow variable and it returns a string.

URI_ABSOLUTE: the absolute URI of the REST request. This is a Flow variable and it returns a string.

HTTP_METHOD: the http method. This is a Flow variable and it returns a string.

ATTACHMENT_HEADERS: the attachment headers from the REST request. This is a Flow variable and it returns a list of attachment header values.

ATTACHMENT_FILENAMES: the attachment filenames from the REST request. This is a Flow variable and it returns all attachment filenames.

PRINCIPAL_NAME: the principal name of the REST request. This is a Flow variable and it returns a string.

CORRELATION_ID: the correlation ID by which chained service calls will be grouped. This is a Flow variable and it returns a string.

ERROR_MESSAGE: the error message generated by the component when an error occurs. This is an After variable and it returns a string. This variable functions only if the Die on error check box is cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl + Space to access the variable list and choose the variable to use from it.

For further information about variables, see Talend Studio User Guide.

Usage

This component covers the possibility that a Talend Job can be wrapped as a service, with the ability to input a request to a service into a Job and return the Job result as a service response.

The tRESTRequest component should be used with the tRESTResponse component to provide a Job result as a response, in case of a request-response communication style.

Limitation

n/a