Delacor Queued Message Handler
Contents
General Description
The DQMH® is a free product based on the National Instruments Queued Message Handler Project Template (NI QMH).
The DQMH® expands on the NI QMH by providing safe, event-based message handling and scripting tools to make development easy, encourage same style between different developers in the same project and improve efficiency.
The DQMH® is ideal for applications where multiple modules must run in parallel, possibly at different rates, while communicating with each other. The DQMH® can also be used for applications that have a single module, where the developer would benefit from having a Tester with the capability of eavesdropping on the different DQMH® events and messages.
The built-in productivity tools make it very easy to add modules to existing projects without having to start from the project template. In addition, there are tools to add and remove events by selecting the desired action from the Tools>Delacor>DQMH menu.
The DQMH® easily integrates with TestStand since all development and troubleshooting can take place under LabVIEW, while calling the public API VIs as individual steps in the Teststand sequence. The tester can eavesdrop during the execution of the TestStand sequence. This is especially useful when the LabVIEW code is written during the research and development or prototyping phase, because the same code can be easily called by TestStand in production or manufacturing sequences without any changes.
The DQMH® uses LVOOP for some internal functions, but developers need not be familiar with LVOOP to use or understand this architecture.
History
The DQMH® was originally created and maintained by Delacor, with Fabiola De la Cueva being the chief architect.
In 2021, Delacor transferred all rights and responsibilities to the DQMH® Consortium[1].
Accolades
- 2016: DQMH® named one of the 2016 winners for the LabVIEW Tools Network Product of the Year ([1])
Additional and 3rd-Party Features
Helper Loops
- Article DQMH® Actors on the DQMH blog
- Tool Wovalab Utilities
Networking
- Article Generic Networking Module on the Delacor blog
UI
Tools
UI
DQMH Trusted Advisors
The DQMH® Trusted Advisors program highlights companies that excel at using DQMH® in their daily project work.
DQMH® Trusted Advisors have been audited by Delacor to verify they are following best practices and have a deep understanding of the DQMH® Architecture. DQMH® Trusted Advisors have demonstrated they know when DQMH® is the best option and when a different architecture is more appropriate. DQMH® Trusted Advisors can help customers start a new project or perform maintenance or upgrades to existing projects created using the DQMH® framework.
The DQMH® Trusted Advisors program was started in 2018 and has currently (Jan. 2022) 8 members. More information can be found on the DQMH® Trusted Advisors website.
DQMH Podcast
The DQMH® Podcast by Wired-In Software[2] is for the NI LabVIEW™ community. It is all about DQMH®, and more broadly software engineering as it applies to DQMH® and NI LabVIEW™. Hear from the DQMH® Consortium and the DQMH® Trusted Advisors about how DQMH® helps solve their customer problems.
DQMH Consortium
The DQMH® Consortium is an organization founded by Fabiola De la Cueva to further the mission of the DQMH® Toolkit: To enable teams with different levels of proficiency to develop LabVIEW™ applications that are readable, maintainable, and scalable.
The mission of the organization is to ensure access to the DQMH® software project and its derivatives. People and businesses may come and go, so it is important to ensure that the source code for these projects will survive beyond the current contributor base, so that we may create a stable framework for LabVIEW™ development for generations to come.
Fabiola invited other esteemed members of the community to start this journey. The founders are Matthias Baudot, Joerg Hampel, Olivier Jourdan and Luis Orozco. This group, together with the DQMH® Trusted Advisors, will ensure that DQMH® is maintained and continues to evolve.
As the DQMH® Consortium is not meant as a money-making enterprise, any income will be fully invested in the development of DQMH® and other tools that benefit the LabVIEW™ community.
Resources
General
DQMH Documentation
DQMH Youtube
DQMH Style Guide
Other Sources
- Delacor Blog (DQMH Category)
- Comparison of AF and DQMH Courseware:Comparison of AF and DQMH by Sam Taggart, System Automation Solutions
- ↑ Public announcement, LinkedIn, April 2021
- ↑ [2], Wired-In Software website