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Last Updated on 22/02/2019 by

I like the idea of clean easily read XML configuration in my Mule projects. Therefore I externalize DataWeave transformations, SQL quires, and other content. In this article, I will compare assets that Mule gives us to share such things in Mule 3 and Mule 4.

How to open a DWL file: The best way to open an DWL file is to simply double-click it and let the default assoisated application open the file. If you are unable to open the file this way, it may be because you do not have the correct application associated with the extension to view or edit the DWL file. Convert Dwl File To Dwg Free Utility Supporting. Autodesk has come up with a free utility supporting this extension, and it is commonly used for viewing and marking DWF files. You can view this document in free Acrobat Reader, navigate through the page or the whole document which is one or more pages usually. Why did I put a response in dwl file instead of for example json? The answer is really simple. Using DataWeave I can transform and infer metadata for next event processors. Often I have a case that input should be a Java object, but I have its JSON representation. Therefore I use dwl file with output set to application/java but in body having. Download open dwg files for free. Office Tools downloads - DWG Open File Tool by Open Files Inc. And many more programs are available for instant and free download. The DWL file is a plain text file and the DWL2 is an XML ASCII file. There are programs that can read the information inside them if you're interested; essentially they log who has opened the file and when. If you want to know who has a file opened, type WhoHas on the Command line in AutoCAD and browse to the file.

Mule 3

It is up to the component if we can load content from the resource or not. The most obvious example is DataWeave Transform Message component that allows that. We have such possibility for Database component using Template query.

As a result we got clear XML configuration as depicted below

It is much more readable, just by looking at XML we may infer what the code does on the high level. If we want to get know better transformation we have a path to the file, that we can examine.

Mule 4

First I was not aware of new functionality delivered with this Mule version. I had a case to rewrite the application to the new runtime. The application makes a couple of database calls.

When I drop Select operation on canvas I could not find any way to externalize my SQL statement. In Anypoint Studio I had a field called SQL Query Text only. Below you can find the XML snippet.

File placeholder syntax

Then I found out that Mule has introduced new syntax to load content from the files

${file::path-to-the-file/filename}

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We have three parts. The first one, file::,implies that the engine should load the file specified after the double colon. Next, you write the file name and path to it. The address is relative to the resources folder.

As you may remember we use similar syntax to load properties like ${http.port}. Mule will try to resolve property http.port before project startup. If the property is missing the project won’t start. If the property is present, placeholder ${} will be replaced with the loaded value for example 8091.

File placeholder syntax is pretty the same. Mule will look for the file just before startup and won’t start if the file is missing. After the content will be loaded it will be put in place of the placeholder ${}.

Information

This functionality is not only dedicated to load DataWeave files. We may load any file that we want. However, when we would like to load DataWeave we need to remember to embrace our call within expression brackets #[]. Otherwise, we may get a text of our transformation :).

Examples

Static SQL statement

File: src/main/resources/sql/select-records.sql

Brief description: SQL statement from the file select-records.sql will be put between <db:sql> tags.

Choice logic

File: src/main/resources/dwl/rule.dwl

Content: sizeOf(payload) > 15

Brief description: content from the file rule.dwl will be put in expression attribute.

Advice

I guess that externalizing choice logic may be useful only if the expression is really complicated and long. For other cases do not use it in order to maintain greater readability.

Mock response

File: src/test/resources/test_data/system-response.dwl

Information

Why did I put a response in dwlfile instead of for example json? The answer is really simple. Using DataWeave I can transform and infer metadata for next event processors.
Often I have a case that input should be a Java object, but I have its JSON representation. Therefore I use dwl file with output set to application/java but in body having JSON object.

Brief description: As you may see I enclosed file placeholder with expression brackets #[]. I used this because the content of the dwl file is a DataWeave script and it needs to be evaluated at runtime. If I would omit the expression brackets my mock component would return string having transformation text.

Composition

File: src/test/resources/test_data/record-to-compare.json

Brief description: I could provide an inline object to compare in equalTo function. However, I decided to externalize all examples. We may use file placeholder even in the middle of DataWeave as in the example above.

Warning

In Anypoint Studio 7.3.2 using file placeholder you may have errors like that one:
Description Resource Path Location Type
Invalid input ‘{‘, expected ~ (line 1, column 2):
For the time being, just ignore it, you will be able to run and build your project without any problem. That is an issue with Studio.

Summary

I think that file placeholder is really great feature that gives more flexibility than we have before in Mule 3. Now we may use this wherever we like even in the middle of DataWeave transformation. It makes XML configuration files more concise and readable. Small drawback, that I see currently, is a problem with Anypoint Studio that misinforms you.

Related posts:

Files with dwl extension can be typically found as lock files generated for drawings databases opened in AutoCAD CAD/CAM software from Autodesk.

Software that open dwl file

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