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Displaying items by tag: parallel agile

The need for speed

With the recent passing of General Chuck Yeager as well as the beginning of 2021, I thought it might be a good time to reflect on the never ending quest for speed. General Yeager, of course, was the man who broke the sound barrier in his Bell X-1 aircraft on October 14, 1947.

It’s always worthwhile trying to do things faster and better — that’s what drives progress and innovation. In the software industry we’re talking about a less death-defying problem than the airspeed pioneers faced, but an important one nonetheless: how fast we can develop software?

 

1 Chuck Yeager X 1 color

Chuck Yeager and the Bell X-1 that broke the sound barrier, Glamorous Glennis

Our primary mission at Parallel Agile is to help companies accelerate the development of high-quality systems — so projects are both faster and cheaper, without sacrificing quality. (Yes, it really can be done!). Maybe in a few years we’ll look back at today’s software engineering techniques with similar nostalgia as we’d look at 1940s subsonic aircraft design.

What makes software slow?

Let’s start by looking at what’s holding a typical software project back from getting itself done quickly:

 

2 speed limiters

Many factors can slow down your project — here are a few chronic causes of software getting done slowly

So, what makes software slow? First of all, the common perception that it’s not possible to develop with bigger teams because of communication overhead. Second, typical agile development processes tend to favor feedback over planning, resulting in under-planned systems that spend lots of time on retrospectives and refactoring. Additional factors relate to a general state-of-the-practice of most code being written by hand — often driven by a general mistrust of generated code. Everything from fundamental database access functions to basic UI functionality is most often still coded by hand. Add in modern requirements for data privacy and database security (things that often don’t fit well into 2 week sprints) and you’ve got lots of time spent writing code the hard way — labor-intensive development. Finally, with CI/CD we’ve got deployment pipelines that get executed on a continuous basis.

How do you go supersonic with your dev process?

So, what’s the right stuff that can help you accelerate your software project? Parallel Agile as a development process, and CodeBot as its primary enabler, offer a different vision for software engineering where the speed limiters shown above are systematically removed. You can remove some of the speed limiters and go faster than before, but it’s really removing the whole set of forced-slowdown practices that yields the most dramatic results.

3 removing speed limits

If your project is being slowed down by anything on the list above, we can help.

Project development is organized by scenario In the first place, from a process perspective, with Parallel Agile you organize your project with a developer responsible for each scenario (hence the “Parallel” part of PA).

 

4 one developer per scenario

It’s simple: assign a developer to each scenario (scale as needed)

You don’t have to work in small teams (although you still can if you prefer to). Communication overhead is reduced by virtue of a shared (executable) domain model among developers. Rather than time slicing development into 2 week sprints (with time on each end for planning and retrospectives), you can allow each use case to evolve along a simplified spiral model starting with proof of concept, moving on to minimum viable product (MVP) and then through as many optimization cycles as needed.

5 spiral

Each scenario (aka use case) evolves asynchronously along it’s own spiral model

How CodeBot shatters the team-size barrier

Back when General Yeager was pioneering flight faster than the speed of sound, it was a dangerous activity because aircraft tended to shake apart due to excessive vibration at Mach 1. But advances in aerodynamics eventually overcame the sound barrier.

What’s the analogy to large team software development? Consider the case where several use case scenarios make use of the same domain object. If you assign a different developer to each scenario, each of those developers needs a common understanding of the data structure (JSON) that comprises that domain object. If you allow each scenario to evolve independently you’ve got a communication and coordination problem to deal with. Having the domain model documented on a UML diagram helps, but it isn’t enough.

We discovered the solution to this problem during the early years of our research into parallel development — to be specific, between 2014 and 2016. During that time we were experimenting with an early version of CodeBot that generated a database access API (and API documentation) from a domain model. We discovered that our developers were able to collaborate easily, even when some were working on mobile apps and others working on web apps. Our first test project involved 47 graduate students working in parallel, on a location-based advertising system (LBA).

We also found that most of the evolution of domain class schema happened during Proof of Concept, and that using a NoSQL database allowed multiple developers to evolve the schema independently. Later, we added switchable schema validation to CodeBot, allowing more free-wheeling changes during prototyping but then providing the ability to lock things down as we moved forward into MVP. We also made updated API docs immediately available online. This ability to rapidly generate a new API along with updated API documentation as changes happen in the shared domain model allows projects to be staffed elastically — your team can be “right-sized” to the problem at hand rather than constrained by pre-imposed limits. This lets you go a lot faster.

6 executable domain model 1

CodeBot turns your domain model into a working database, accessible by a REST API, in moments

Inside the use cases: Getting WIRED

We’ve found that it makes sense to organize the project along use case boundaries, with larger teams of developers each working their own use case, interfacing to a shared domain-driven database API (or event-based model, etc). But what happens inside the use cases? Do we need to do a lot of formal use case modeling? Not necessarily…

We think the fastest way to proceed within each use case is to wireframe up the screens that participate in the use case, connect the wireframes to the executable domain model, and then code generate the screens. Think of this as Wireframe-driven, Iterative, Rapid, Enterprise-ready Development (WIRED).

7 wireframe MVC

You might recognize a Model-View-Controller pattern in CodeBot’s generated UI code

We use the CodeBot full-stack application generator to do this code generation for us. In fact, CodeBot is optimized towards PA’s highly iterative process. In short, you can use CodeBot to generate working user interface code (e.g. React JS) from wireframes, where the UI navigation or user flow is driven from a UML state machine, and the screens connect to the database using the API. It all happens automatically, and it happens very quickly with CodeBot UX.

 

8 wireframe to map

CodeBot UX is the fastest way to get from an EA wireframe to a running web application

 

Being Enterprise-ready means Security is baked in

To be Enterprise-ready in 2021, you need to deal with requirements for data privacy.  This means avoiding threats from hackers, making your applications fully security-aware, and implementing best practices for secure development. From an app development standpoint, dealing with security concerns slows you down, and complicates hiring and staffing your project as not all developers are expert at security-related issues.

9 access control

CodeBot-generated APIs come with an Access Control Layer that helps prevent unauthorized access

Over the last year we’ve spent massive amounts of effort building security infrastructure into CodeBot. Capabilities like server-side registration and login automatically generated as part of the API, fully-tokenized (JWT) access, and Role Based Access Control (RBAC) are built-in to the database access API as an access control layer when the model is code generated. The resulting time and cost savings all accrue to your benefit. And if you consider the cost of getting your database hacked…it’s a pretty easy decision to make.

Rapid Iterations come with auto-deployment

To fully realize the promise of agile, feedback-driven development, you need to iterate the project’s use cases quickly to gain immediate feedback from clients. CodeBot enables this capability through automatic deployment of both the UI and the back-end database/API.

10 deployment

With CodeBot UX you go from a UML model to a running (and hosted) web app in under 5 minutes

At present, CodeBot can generate and deploy a securely hosted full-stack web application from a UML model in approximately 4 minutes. This capability makes it quick and easy for each use case to evolve through its spiral model and to quickly test in the context of a deployed system.

So, how fast do you want to go?

Are you content with the pace of small-team, short-sprint agile development, or would you like to deploy a larger team on a more complex problem and get the project done more quickly? Are you happy with the pace of writing database access code by hand, and wrapping the common database functions in a REST API, by hand? Is it quick and easy to turn a set of wireframes into fully-functional user interface code, where the screens are automatically linked to the database? Are you happy with the pace of adding Security to your applications? And finally, does it take you longer than 4-minutes to build and deploy a fully-working application? If you’d like to get your projects done faster and less expensively, but without sacrificing quality… contact us at This email address is being protected from spambots. You need JavaScript enabled to view it..

Published in White Papers
Thursday, 10 December 2020 20:34

Tutorial: Domain Driven Database Design

The first video of our CodeBot 201 tutorial series walks you through defining a domain model for a Fantasy Football app, and using CodeBot to instantly transform the domain model into a complete MongoDB database and REST API:

 video title

How easy is it to generate a working database and API from an EA domain model?  Really, really easy...

This video will show you how in less than 3 minutes…which is about how long it takes for you to try it yourself.  In our example, your app can show video of the players scoring touchdowns in near real-time 

 

In this video we’ll follow the evolution of the TEAM object from a noun on a short problem domain description,

list of nouns

Team is an object in the problem domain

 to a class on a domain model diagram,

domain model

A Team has an Owner and a Roster and a Schedule

 

to a Mongo DB collection with a NodeJS REST API (documented in Swagger),

API docs

Use the API to Create Teams, Read Teams, Update Teams…

and a client-side layer that makes accessing the API nice and straightforward.

client code

 You don’t need to call the API directly because CodeBot generates client-side code including usage samples

CodeBot is a complex product that does an incredible amount of work to simplify your life as a developer. Give it a try today!

Published in Tutorials

How to create a full-stack React Bootstrap UI in under 10 minutes

A tutorial and reference on designing a complete web application and generating it with CodeBot UX

by Matt Stephens, Parallel Agile

This article was originally published here: https://medium.com/parallel-agile-blog/create-a-full-stack-react-bootstrap-ui-in-under-10-minutes-d0eec3077618

CodeBot from Parallel Agile is a full-stack application generator, which can also host your generated application in the cloud. Give CodeBot a domain model and UI wireframes, and it’ll create:

  • a React web UI
  • a MongoDB database
  • a Node/Express.js REST API, optionally secured using JWT
  • API client libraries — currently Java and JavaScript, with other languages set to be released soon, including C#, Swift, TypeScript
  • JSON Schema
  • Swagger/OpenAPI docs

We have more targets, platforms, architectures and languages on the way, but that’s plenty to get started with!

To whet your appetite, here’s a quick CodeBot video that shows a project being turned into a generated UI:

tutorial1

 

Getting Started

To get started designing your new application, you’ll need:

  • a copy of Enterprise Architect (EA)  to create the domain model and wireframes
  • a CodeBot account from Parallel Agile

At the time of writing, the generated React UI isn’t in full release, but it’s available under Early Access for customers with a CodeBot license (to gain access, please email us)

There’s also a handy series of step-by-step CodeBot 101 videos that show how to get everything installed and set up — so I won’t repeat those details here:

VSRADS Example

In this article I’ll walk through the a much-simplified version of the “VSRADS” model shown in the above example video.

VSRADS stands for “Very Short Range Air Defence System” — it’s basically a mosquito zapper. It listens for the high-pitched whine of a mosquito flying by, calculates its position and trajectory, and zaps it with a low-frequency laser.

Our example project is a state machine simulator… given a series of states, a web page is generated to represent each one; and the state machine itself is turned into the navigation “user flow” between pages — i.e. the routes.

So let’s get started!

Step 1: Create a project with 3 top-level packages

Create a new, blank project in EA, and give it the following 3 packages (via “Add View” in the right-click menu):

tutorial2

 

This will become a familiar pattern… the “three amigos” for defining a new full-stack project

When the model is generated later, the elements in each of these packages will contribute to the generated application, as follows:

tutorial3

  • Each wireframe is turned into a React web page
  • The navigation state machine is turned into a set of routes
  • Each domain class (created in the Domain Model package) is turned into a MongoDB collection and REST API create/read/update/delete endpoint

Step 2: Draw the domain model

Under “Domain Model”, create a class diagram and populate it with some domain classes.

The complete VSRADS domain model looks like this:

 tutorial4

For this example you could just create a subset — just be sure to include Simulation Run, as we’ll be linking it to the UI and database.

Step 3: Design the UI Navigation

The idea is that you design individual screens as wireframes, and link them together via a “user flow” or navigation diagram; in this case we’ll draw the user flow as a state machine:

  • Each state represents a screen or page
  • Each transition (the arrows linking the states together) represents a navigation route

Navigation routes are triggered by things like clicking a link, or submitting a form — “create” or “update” actions.

To introduce the idea, here’s a “hello world” kind of example:

 tutorial5

 

Each generated page will be given its own URI (/login, /view_products etc) so can be individually bookmarked. However, the “Initial” pseudo-state is used to determine which page is displayed by default— the “navigation root” or home page.

Back to VSRADS though… this is a more complex state machine:

 tutorial6

 

Each transition arrow has been given a trigger, which is shown as a label in the diagram. To add a trigger, double-click on the transition:

 tutorial7

 

In EA, you don’t need to select the trigger type etc, you can just enter a name, to keep it simple.

The name needs to match up with the component name in the wireframe, e.g. a button called “Target Identified” — you’ll see some examples of this in the next section.

Usually, the trigger name is also prefixed with an event type, such as on click: or on create: . However, “on click” is the default, so can be omitted.

It’s also worth noting, if the button name is the same as the target page, then CodeBot will figure it out, so you then don’t even need to give the transition a name.

The following event prefixes are supported:

  • on click— e.g. “on click: Login”
  • on create — e.g. “on create: Target”
  • on update — e.g. “on update: Target”

The events all take place in the “source page”, i.e. the page that the transition arrow points from. The trigger will, as you’d expect, result in the app navigating to the “target page”.

The create and update events are triggered when a form is submitted in the “source page”.

Now that you have the overall website or application designed, it’s a good time to create a wireframe for each one.

Step 4: Design the wireframes

EA has a UI wireframe designer built-in. Because the wireframes are fully integrated into the UML model, you can link together wireframe elements, classes, states and other elements… so everything fits together in the generated project.

The VSRADS model has 8 wireframes in total. For this article we’ll focus on two of them, Set Up Simulation (the start page), and Listening for Mosquitoes.

Creating a Wireframe

Right-click on the Wireframes package and choose New Diagram:

tutorial8

In the new wireframe, you need to create a top-level frame which serves as the page-size boundary. This may seem less relevant for websites, but will become important when CodeBot also generates other platforms such as mobile apps. (New feature coming soon!!)

 tutorial9

Always add a “Client Area” to represent the page boundary, and fit all the wireframe components inside it

Next, add some components to the page!

  tutorial10a

Currently with the Early Access release, CodeBot recognises a subset of all the available components. So for now, be sure to only add from the Controls and Website Controls tool palettes.

Position and size the components to match your page design. CodeBot will translate this into a responsive website layout; e.g. it’ll detect grids of label/textfield pairs, alignment of individual labels or buttons, etc.

You can also supply hints to influence how the page is generated. In EA, this is done via tagged values — you can find these on the Tags tab in the Properties panel:

 tutorial11

In the above screenshot, the Set up Simulation title has been given a tag called css class, with the value h1 (“Heading 1”). To add more than one CSS class, separate them with spaces.

The generated website uses the popular React-Bootstrap project, meaning you can specify any “Bootstrap-standard” CSS classes here.

Another useful tag is variant. This conforms to the Bootstrap 4 colour variants:

 tutorial12

For example, the Run Simulation button is given the “primary” variant (the exact case doesn’t matter) via a tagged value, so will be rendered in the page with a solid-blue background:

 tutorial13

In this way, it’s possible to adhere to Bootstrap’s design language—the “primary” variant represents the main or default action, etc.

For future platforms even if they don’t use Bootstrap, CodeBot will adapt the same “Bootstrappy” tagged values to the target platform, so you’ll only have to draw the wireframes once in order to get a generated website, mobile app, desktop app etc.

Just to illustrate another page in the same UX design, here’s the Listening for Mosquitoes wireframe:

 tutorial14

The Image component can display any image type normally supported in web browsers (jpeg, gif, png). Just include a url tag with the complete URL where the image can be loaded from.

Step 5: Define actions on UI elements

In the previous screenshot, the Run Simulation button also has a tag called action, with the value create.

As long as the button resides in a container panel with form components (text fields etc), when the button is clicked, the form will be submitted to the generated REST API. What happens next depends on the value of the action tag:

  • create (create a new record in the database)
  • update (update the current record)

The form elements do need to be linked to a particular domain class, though; so let’s do that next.

Step 6: Link UI elements to the domain model

There are two ways to associate UI elements with a particular domain class:

  1. Use the domain tag
  2. Draw a dependency relationship from the UI element to the domain class

Which one you use is entirely up to you; the effect on the generated code is exactly the same. It’s more of a stylistic choice, as some people appreciate the visual aspect of seeing a link on the diagram, while others prefer the detail to be tucked away.

Domain tag

Click on the form component you’d like to link, and add a tag as follows:

tutorial 16a

The domain tagged value uses the form:

Class Name.attribute name

e.g. Simulation Run (the domain class), a dot, then name (the attribute name).

As a time saver, you can also just add the domain class name to the parent container panel:

 tutorial17a

The “child” form components are then auto-linked to the domain attributes, by matching each component name with an attribute name.

Once this linking-up is done, then when the generated form is submitted, it’ll automatically call the correct REST API endpoint for that domain class.

Dependency arrow

As an alternative to the domain tag, simply drag the relevant domain class from the package explorer onto the wireframe. Then draw a dependency arrow from the container panel to the class:

 tutorial17

You can also link the individual text fields to the class, if preferred.

To emphasize again, this has exactly the same effect as using the domain class; which you use is just a personal preference.

 

Step 7: Generate the application

If you have the CodeBot add-in installed in EA, right-click on the root (“Model”) package in the package browser. Then choose:

Specialize > Parallel Agile > Generate Project

If you can’t run the add-in for any reason (e.g. you’re on a Mac using a Windows VM), another way to run CodeBot is as follows:

  1. Make sure you’ve selected the root (“Model”) package, then from EA’s ribbon menu, choose:
    Publish > Export-XML -> Export XML for Current Package
  2. Login into the CodeBot Web Console at parallelagile.net, and choose Upload XMI:

 tutorial18

tutorial19

CodeBot will detect that the model contains wireframes, and automatically generate a Bootstrap-React project. You can find it in the downloaded zipfile, in the UX/React folder.

 

Step 8: Run the React app!

You can optionally elect the generated application to be hosted — just make sure the “Publish to our cloud service” checkbox in the above screenshot is ticked.

In this case, CodeBot will automatically build the React app, and then publish the full website, REST API and database to our secure cloud service.

To access the hosted website, click the blue Visit Website button (visible in the above screenshot).

The Set up Simulation page will load in a separate tab:

 tutorial20

 

When you enter some form details and click Run Simulation, the following series of events take place:

  1. Due to the action tag and the linked domain class, the React app submits the form to the REST API
  2. The REST API validates the form data against the generated JSON Schema (based on the domain class and attributes), then creates the new record in the MongoDB database
  3. Due to the on create: Run Simulation trigger on the navigation state machine, the React app will detect that a “create” just happened linked to the Run Simulation button. So (as the trigger is on a transition), the browser navigates to the next page, Listening for Mosquitoes:

 tutorial21

In closing…

CodeBot UX radically shortens the iterative feedback loop when developing new software. When domain modeling, you can now quickly create a working prototype, use the prototype to elicit new or changed requirements, feed the updates back into the model, rinse and repeat…

… often several times in the same workshop session, with the customer or domain expert right there in the room (or on the same Zoom call).

CodeBot UX is available now for Early Access customers. To request access, please email us at: This email address is being protected from spambots. You need JavaScript enabled to view it. — we’ll welcome your feedback!

Published in Tutorials
Tuesday, 01 October 2019 08:45

Anatomy of an Executable Architecture

Anatomy of an Executable Architecture

 

A few months ago, we released the Parallel Agile Add-in for Enterprise Architect.  This add-in gives Enterprise Architect users a unique opportunity to save substantial amounts of time in building the database infrastructure for your project, because you can now generate it automatically from a domain model (class diagram).   What gets generated includes database access functions, an API to access the database, API documentation of, and some client side code that shows you how to call the API - what we're calling an Executable Architecture.  Our first target platform is MongoDB and Node.JS (aka MEAN Stack), but we're currently working on additional platforms including MySQL and Firebase, so stay tuned.  

Meanwhile, let's say you’re starting a new MEAN Stack project and you’re going to need a MongoDB database, Node API to access it, API documentation and some client-side code, so you can start prototyping. How fast can your engineering team get it done? How about an hour?

With Parallel Agile CodeBot you can spend an hour or so with the project stakeholder, BA and a bunch of other people, creating a domain model. Then simply right-click in the model and click Generate Project. Seconds later, you have a complete, working API, client library, Swagger API docs, and it’s already hosted as a live prototype API for your team to try out.

Here’s an example of what CodeBot will create based on your domain model, for a Node/Mongo architecture:

infrastructure

Let’s say you’re creating a single database collection called PaymentMethods. Typically you would need to create at least all of the following, just to be in a position to start prototyping the UI and so forth.

First, you would need to build the basic set of database access functions for each database collection (or table) that you’re going to need.  These are the CRUD (Create, Read, Update, Delete functions).  In a NoSQL database like Mongo these are implemented with GET / PUT / POST methods:

 CreateOne Mongo

Next, you would need to define a REST API to allow your client-side code to call the database access functions.   In a MEAN Stack application these are bundled together in an Express JS file as shown above.  Note that each of your database access functions has several layers of exception handling that need to be built.

After creating the API, you’ll need to create API documentation so that your client-side developers know how to call it:

CreateOne API Docs

Once your API is in place and documented, you’ll want to write some client side code that encapsulates the database access methods.  You might write a JavaScript client that handles callbacks:

CreateOne JS Client

Or you might write a Java client:

CreateOne Java Client

 

It’ll make sense for your Java client to have an entity class (often referred to as a Plain Old Java Object or POJO) available for each domain object:

pojo

All of this code is infrastructure for your project, and tends to be of a somewhat boring and repetitive nature - you always need to write the database access functions, they need to be written for each collection, and the code is all very similar to the code you wrote yesterday.  Writing it by hand is slow, tedious, and error-prone.

Yet in thousands of development organizations around the globe, developers are writing the database access layer of their applications manually.  We asked ourselves if there was a better way and decided the answer was yes.  And then we built it.  If you’d like to try it, download the free Parallel Agile Add-In for Enterprise Architect.

Published in Tutorials

One of our biggest challenges at Parallel Agile is explaining how two apparently unrelated aspects of our business are actually very closely related. Specifically, how our domain driven database and API generator (aka Parallel Agile CodeBot) enables the Parallel Agile Process, which allows large teams of developers to collaborate more efficiently and breaks the “two pizza rule” on team size.

To understand how the CodeBot enables large-scale parallel development we need to go back to Brooks’ Law, the widely believed postulate that you can’t accelerate a software project by throwing more developers at it. Fred Brooks identified some key reasons why this has been (for the most part) a truism for the last 50 years. Two of the most important reasons are:

1) Communication. When you add new developers to a software project, somebody has to explain to them how the existing code is structured, and the new developers each have to experience a learning curve before they can be productive. Generally it’s the experienced developers (who are already productive) that have to take time away from their own work to train the new folks. So adding developers can actually slow you down.

2) Integration. If you have a large team of developers working (relatively) independently, it’s going to be difficult to make all of the pieces plug together and play well as an integrated whole piece of software.

It’s important to remember that Fred Brooks developed his postulate while managing a large mainframe operating project (OS/360), which was introduced in 1964. That’s a long time ago. There were no UML modeling tools, no REST APIs, no NoSQL databases. So it’s not unreasonable to ask the question 55 years later whether any modern technical innovations might mitigate some of the underlying factors that have made Brooks’ Law seem to be inviolable for such a long time. That answer turns out to be Yes – making a domain model executable mitigates both the communication and integration problems and enables large-team development to work a lot better.

While I’ve never been a big fan of Brooks’ Law, when we started the research that led to Parallel Agile, there was no particular intent of trying to disprove it.  It started back in 2014  when Barry Boehm and Supannika Mobasser invited me to give a guest lecture on ICONIX Process in their  CS577 Software Engineering class at the University of Southern California.   Around this time I had developed an interest in geofencing, and had in mind to develop a geofenced mobile app that delivered coupons to your phone when you got physically close to the business that was offering the coupons. 

LBA use cases

When I accepted the invitation to guest lecture I decided to ask if they would like me to grade a couple of UML homework assignments in addition to guest lecturing. They agreed so I split my Location Based Advertising project into 47 low level use cases and assigned one use case per student as homework (writing prototype code for the use case was optional extra credit).

To make a long story short, we were all surprised that the 47 independently developed use cases actually integrated into a cohesive system. I can clearly recall sitting in Barry’s office saying “you know, that’s not supposed to be possible” and Barry agreeing “yes, I know”. When we started investigating how the successful integration happened it seemed that we had made some fortunate choices of using a NoSQL database (Cassandra) and a REST API (Node JS), and giving all the students a code template that implemented the database access functions (aka CRUD functions) for a Cassandra collection that they could clone for their part of the database.

LBA Domain Model 2

 

It turned out that having the domain model in place made communication across the large (47 student) team go pretty well, and having all of the database access functions available through a REST API allowed different pieces of the system (iOS app, Android app, web app) to integrate together with ease.  And when we studied the effort numbers it turned out that each of the 47 use cases took about 4 days to develop – a day on requirements analysis, a day on design, and two days of coding.

One of the student from that project joined the PhD program and implemented a code generator that turned domain models into Mongo DB and Node JS, and after using this successfully on several other projects we decided to start Parallel Agile.

So, to sum it up…having a visual model of the problem domain makes it easy for everybody to get on the same page about what’s being built.  Generating your database from this domain model, and having a uniform set of functions to Create, Read, Update and Delete items in the database makes it easy for everybody’s code to integrate together.  And that’s how a code generator enables large-scale parallel development.

Published in Tutorials

 

We've just released a major upgrade to the Parallel Agile CodeBot.  As you might already know, CodeBot generates database schema, database access functions, and a REST API to access the database from a UML domain model.  But you might not know specifically how the class diagram is interpreted during code generation.

Here’s a simple domain model for a video editor that allows you to annotate an image for machine learning.

domainmodel

This example only uses Aggregation, but several other relationships are possible.  The table below explains how CodeBot interprets what’s on the diagram.

UML relationships

You should find Composition useful for creating nested JSON structures; something which particularly lends itself to MongoDB collections, where the recommended “best practice” is that child elements with a strong ownership relationship are nested within each parent element, rather than being put into separate collections.

All other relationship types – Dependency, Realization, Responsibility etc (ad infinitum) – are treated as “non-semantic” by CodeBot, so can safely be used to define more abstract concepts that document the model rather than drive it.

How Multiplicity affects what’s generated

If you define multiplicity in the relationships (e.g. 0..1, 1..*), CodeBot uses these wherever possible for validation checks. If you don’t define the multiplicity, it defaults to either “0..1” or “1”, depending on the context.

Multiplicity also affects whether fields are generated as a single item or a list of items. Additionally, in languages that support optional types (e.g. Option in Scala, or Optional in Java), a multiplicity of 0..1 will be generated as an optional type.

Let’s quickly illustrate that with some brief code examples:

multiplicity

Try CodeBot for free at http://www.parallelagile.com/codebot.html

 

Published in Tutorials
Thanks to my colleague Matt Stephens for writing this tutorial on the CodeBot that he's built.  You can download the CodeBot tutorial here, and also watch a CodeBot Tutorial video  here.
codebot
Parallel Agile CodeBot™ is accesible through the Parallel Agile Add-in for Enterprise Architect.  The CodeBot generates a complete REST API from your UML domain model. This article illustrates step-by-step how to run CodeBot from within EA, and incorporate the instant generated API into your domain driven project.
Find out more about Parallel Agile and try out CodeBot for free.
By the way, we also offer training, consultancy, and support for projects using CodeBot and the Parallel Agile development process. If this sounds like just what your organization needs, contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.
Published in Tutorials

This article will introduce you to both the Parallel Agile (PA) process and to the Parallel Agile Add-in for Enterprise Architect, which enables the PA process for Sparx customers.

Download the article in PDF here.

 

Parallel Agile Addin for Enterprise Architect

 

The Parallel Agile Add-in generates database access code and REST APIs from domain models, and it works in conjunction with the ICONIX Agile DDT Add-in, which generates acceptance tests from requirements and use cases.   Both add-ins are free.

We’ll discuss:

  • What’s Parallel Agile?
  • Compressing schedules with parallel development
  • Improving quality while compressing schedule
  • Why did we build an Enterprise Architect Add-in?
  • What’s an Executable Architecture?
  • What’s a Parallel Agile CodeBot?
  • Using the CodeBot to generate code for your domain model
  • Using our Cloud-Based Hosting Service to Test Your Generated API
  • Use Case Complexity Analyzer
  • Parallel Agile MDG Technology - supports Sprint Plans

 

 

 

Published in News