Apply to unlimited castings. Appear in the Talent Directory and be viewed and contacted by Production Individuals. Be submitted for specific casting briefs not advertised on the site via our agency. Introducing an easier way to access all of your TalentEd products. Talend Patterns & Practices. Talend Patterns & Practices provides our customers and partners with reference architectures and guidance for building scalable and secure solutions using Talend products.
Talend Patterns & Practices provides our customers and partners with reference architectures and guidance for building scalable and secure solutions using Talend products. The goal of this Architecture Center is to publish logical and physical architectures in order to help you understand the various components in our products, the relationship and interactions between them, and best practices around their deployment. The site also provide guidelines on scalability, availability, security and sizing.
The content starts off with version 6.4 and our goal is to keep the content up to date and generate new content for every subsequent major version of the product.
The website provide links to download visio files (below Logical Reference Architecture images) and Power Point Presentation (in MDM) which can be utilized and modified to build your own custom solution architecture.
Since Talend provides a comprehensive set of products to enable customers to build their data integration as per their needs, to properly leverage the Talend products it is imperative to apply proper architecture, design and best practices when designing the platform and end solution.
The tHttpRequest component is part of the Internet family of components, and makes both POST and GET requests to the specified URI.
tHttpRequest has a fixed Schema consisting of a single String field named RequestBody. For successful requests, RequestBody will contain the result of the request.
URI allows you to specify the address of the resource required.
tHttpRequest allows you to make both POST and GET requests. For POST request, you must specify a file that contains the Post parameters.
Write response content to file
As well as writing the request response as row data, tHttpRequest may also write the response to a file. Selecting this option allows you to specify the name of a file that the response should be written to.
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Headers allows you to specify HTTP Header Fields, as value-pairs. This allows you to add or override the headers that are sent with the request.
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If the service that is being requested, requires user and password authentication, select this option. This allows you to specify the user and password that will be used for the request.
In this example, a GET request is used, to get a stock quotation from Yahoo! Finance.
As can be seen from the screenshot, below, a correctly formatted URI
'http://finance.yahoo.com/d/quotes.csv?s=GOOG&f=snab' has been entered as a GET request.
Example #1 Result
Use of tHttpRequest does pose some Error Handling issues. We'll explore these in this article.
Certain conditions will cause tHttpRequest to throw an Exception. If we re-run our example Job while we have no Internet connection, we'll see the following results.
In this example, our Job has immediately terminated with
java.net.UnknownHostException: finance.yahoo.com. Some components allow you to continue after an exception; tHttpRequest does not. We may choose to add our own Exception Handling. For more information on this, read our article on the tJavaFlex Component.
On Component Error
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tHttpRequest supports the triggerOn Component Error and this can be used in conjunction with the value Error Message - ERROR_MESSAGE (After). This value can be retieved from tGlobalMap
(String) globalMap.get('tHttpRequest_1_ERROR_MESSAGE') when a Component Error occurs. Unfortunately, I have been unable to identify any event that causes this trigger to be fired.
HTTP Status Codes
On completion of a request being made, an HTTP Status Code will be returned, together with the requested content (assuming the request was successful).
This is where the component tHttpRequest lets us down, somewhat. To undersand why this is, let's look at some of the code that Talend will generate for our code.
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As can be seen from the above code fragment, if an HTTP Status Code of
HTTP_OK is returned, our requested content is written to
sb_tHttpRequest_1 and, later, made available to our Job as
If any other HTTP Status Code of
HTTP_OK is returned, the value
urlConn_tHttpRequest_1.getResponseCode() + ' ' + urlConn_tHttpRequest_1.getResponseMessage() is written to the console
System.err.println. Any information relating to the request error is lost to the Job Developer. All is known is that
row1.ResponseContent is a
null reference and we can deduce that the request has not been successful. Unfortunately (programmatically), we do not know why.
For fur information on on how Exceptions may be handled, read our article on the tJavaFlex component. To see an example Job using this component (including an Exception handler), read our article Stock Market Analysis Project - Get Stock Quotes.