Welcome!

Microservices Expo Authors: Lori MacVittie, XebiaLabs Blog, Ruxit Blog, Elizabeth White, Liz McMillan

Related Topics: @CloudExpo, Mobile IoT, Microservices Expo, Microsoft Cloud, Silverlight, Apache

@CloudExpo: Article

Windows Azure Mobile Services

Windows Azure Mobile Services is the bomb, but how can we work with enum values?

Now, in order to do this, it makes some assumptions.  It looks at the JSON object, and if it sees a certain type of data, it creates a certain type of column to support the data.  The easiest thing that it could have done would be to just create text columns in the underlying SQL database, since any type of data can be stored as a string.  Instead, it does something quite a bit smarter, and creates data types that are quite a bit more “appropriate”.  Here’s the strategy that it uses:

JSON / CLR Data Type T-SQL Type in underlying SQL Azure database table
Numeric values (integer, decimal, floating point) float(53) – this is the maximum precision float.
Boolean bit
DateTime DateTimeOffset(3)
String nvarchar(max)

OK, so this is great.  Dynamic schema is pretty cool.  However…

When I work on a database schema, I often run into a case where I want to create a “code/decode” style table.  In my world, a “code/decode” table is typically a two column table, where the primary key is the “code” and the other column is a textual description.  The canonical example is a “States” table (in the US).  Like this:

Code Decode
AL Alabama
AK Alaska
AZ Arizona
IL Illinois
WY Wyoming

Then, with this table defined, I’ll just use it anywhere I need a State… like this:

Column DataType Notes
FirstName nvarchar(50)
LastName nvarchar(50)
Address1 nvarchar(100)
Address2 nvarchar(100)
City nvarchar(100)
State char(2) Foreign Key to State Code
ZIPCode char(5)

Now, in my current project, it wasn’t a state code that I needed, it was a “CurrencyType”.  And moreover, I wanted to be able to have an “enum” value of CurrencyTypes to be able to work with in my application.  This led me to wonder how WAMS could handle storing and retrieving an “enum” in the database.  It’s not immediately clear that it would know what to do with it as a JSON type.  The JavaScriptSerializer seems to turn enum values into an integer value, which would probably work, but I really wanted my underlying SQL table to store “IL” for Illinois, and not the number 14 as a 53 bits of precision float.  So, how can I turn my enum values into the underlying state codes as a 2 character string on the way in, and reconvert them back to my enum values on the way out?

To start with, here’s the (truncated) version of my enum for my CurrencyType.

public enum CurrencyType
{
	UnitedArabEmiratesDirham,
	AfghanistanAfghani,
	AlbaniaLek,
	//...
	UnitedStatesDollar,	
	//... 
	Unknown
}

Next, the secret sauce turns out to be an IDataMemberJsonConverter .  This interface exists within the Microsoft.WindowsAzure.MobileServices assembly, and has 2 methods that you need to implement – ConvertFromJson and ConvertToJson.  Here’s the type converter that I created to massage my enum into a string going in, and from a string back to the enum on the way back out…

First, the ConvertToJson method:

public IJsonValue ConvertToJson(object instance)
{
	if (instance is Types.CurrencyType)
	{
		switch ((Types.CurrencyType)instance)
		{	
			case Types.CurrencyType.UnitedArabEmiratesDirham:
				return JsonValue.CreateStringValue("AED");
			case Types.CurrencyType.AfghanistanAfghani:
				return JsonValue.CreateStringValue("AFN");
			case Types.CurrencyType.AlbaniaLek:
				return JsonValue.CreateStringValue("ALL");
// SNIP
			case Types.CurrencyType.UnitedStatesDollar:
				return JsonValue.CreateStringValue("USD");
// SNIP
			default:
				return JsonValue.CreateStringValue("XXX");
		}
	}
	else
		return JsonValue.Parse("null");
}

Next, the ConvertFromJson method:

public object ConvertFromJson(IJsonValue value)
{ 
	CurrencyType result = Types.CurrencyType.Unknown; 
	if (value != null && value.ValueType == JsonValueType.String) 
	{ 
		switch (value.GetString()) 
		{ 
			case "AED": 
				return Types.CurrencyType.UnitedArabEmiratesDirham; 
			case "AFN": 
				return Types.CurrencyType.AfghanistanAfghani; 
			case "ALL": 
				return Types.CurrencyType.AlbaniaLek;
// SNIP 
			case "USD": 
				return Types.CurrencyType.UnitedStatesDollar;
// SNIP 
			case "ZWD": 
				return Types.CurrencyType.ZimbabweDollar; 
			case "XXX": 
				return Types.CurrencyType.Unknown; 
			default: 
				return Types.CurrencyType.Unknown; 
		} 
	}
	return result;
}

Now, the only thing remaining is to decorate the CLR class that we’re using to hold our object with enough information to get the serializer to use our type converter as necessary.  In my case, the column for CurrencyType is contained in a class called FamilyGroup.  Here’s that implementation:

public class FamilyGroup
{
	public long Id { get; set; } 
	public string Name { get; set; }

 	[DataMemberJsonConverter(ConverterType = typeof(CurrencyTypeConverter))] 
	public CurrencyType CurrencyType { get; set; }
}

And that’s it.  We have our enum to work with in our code, we’re able to store and retrieve our values to WAMS and the data in the tables is readable to boot.

Happy coding.

More Stories By Adam Hoffman

Adam is an technical evangelist working for Microsoft. By day, you can likely find him somewhere in the Midwest, driving to somewhere, ready to figure out how the cloud can save your family from certain doom, and make you rich and successful in the process. Before he started evangelizing, Adam was a Senior Developer Lead for Microsoft in Redmond, working on Office 365, BPOS, and Office Live. He misses Redmond, and the excitement of the mother ship, but the call of bitter cold and lots of snow in Chicago was too much for him, and he had to return.

Prior that that he developed software and ran teams for Thomson Reuters, Method Engine (which he co-founded), VSA Partners, Navigant Consulting, Andersen Consulting, and a couple of CASE tool companies way back in the day. His favorite possession is a clone of the original Altair computer, running BillG's 8K BASIC, which he's still intending to hook up to the cloud, someday, somehow.

You can read his Windows Azure Blog at http://stratospher.es, and tweeter-er him at http://twitter.com/stratospher_es.

Additionally, if you'd like to keep track of his cloud connected car, you can follow it on Twitter at http://twitter.com/cloudcar1.

@MicroservicesExpo Stories

Let's just nip the conflation of these terms in the bud, shall we?

"MIcro" is big these days. Both microservices and microsegmentation are having and will continue to have an impact on data center architecture, but not necessarily for the same reasons. There's a growing trend in which folks - particularly those with a network background - conflate the two and use them to mean the same thing.

They are not.

One is about the application. The other, the network. T...

If you are within a stones throw of the DevOps marketplace you have undoubtably noticed the growing trend in Microservices. Whether you have been staying up to date with the latest articles and blogs or you just read the definition for the first time, these 5 Microservices Resources You Need In Your Life will guide you through the ins and outs of Microservices in today’s world.
This is a no-hype, pragmatic post about why I think you should consider architecting your next project the way SOA and/or microservices suggest. No matter if it’s a greenfield approach or if you’re in dire need of refactoring. Please note: considering still keeps open the option of not taking that approach. After reading this, you will have a better idea about whether building multiple small components instead of a single, large component makes sense for your project. This post assumes that you...
SYS-CON Events announced today that eCube Systems, a leading provider of middleware modernization, integration, and management solutions, will exhibit at @DevOpsSummit at 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. eCube Systems offers a family of middleware evolution products and services that maximize return on technology investment by leveraging existing technical equity to meet evolving business needs. ...
This complete kit provides a proven process and customizable documents that will help you evaluate rapid application delivery platforms and select the ideal partner for building mobile and web apps for your organization.
Before becoming a developer, I was in the high school band. I played several brass instruments - including French horn and cornet - as well as keyboards in the jazz stage band. A musician and a nerd, what can I say? I even dabbled in writing music for the band. Okay, mostly I wrote arrangements of pop music, so the band could keep the crowd entertained during Friday night football games. What struck me then was that, to write parts for all the instruments - brass, woodwind, percussion, even k...
Sharding has become a popular means of achieving scalability in application architectures in which read/write data separation is not only possible, but desirable to achieve new heights of concurrency. The premise is that by splitting up read and write duties, it is possible to get better overall performance at the cost of a slight delay in consistency. That is, it takes a bit of time to replicate changes initiated by a "write" to the read-only master database. It's eventually consistent, and it'...
SYS-CON Events announced today that Isomorphic Software will exhibit at DevOps Summit at 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Isomorphic Software provides the SmartClient HTML5/AJAX platform, the most advanced technology for building rich, cutting-edge enterprise web applications for desktop and mobile. SmartClient combines the productivity and performance of traditional desktop software with the simp...
With so much going on in this space you could be forgiven for thinking you were always working with yesterday’s technologies. So much change, so quickly. What do you do if you have to build a solution from the ground up that is expected to live in the field for at least 5-10 years? This is the challenge we faced when we looked to refresh our existing 10-year-old custom hardware stack to measure the fullness of trash cans and compactors.
The emerging Internet of Everything creates tremendous new opportunities for customer engagement and business model innovation. However, enterprises must overcome a number of critical challenges to bring these new solutions to market. In his session at @ThingsExpo, Michael Martin, CTO/CIO at nfrastructure, outlined these key challenges and recommended approaches for overcoming them to achieve speed and agility in the design, development and implementation of Internet of Everything solutions wi...
This digest provides an overview of good resources that are well worth reading. We’ll be updating this page as new content becomes available, so I suggest you bookmark it. Also, expect more digests to come on different topics that make all of our IT-hearts go boom!
Node.js and io.js are increasingly being used to run JavaScript on the server side for many types of applications, such as websites, real-time messaging and controllers for small devices with limited resources. For DevOps it is crucial to monitor the whole application stack and Node.js is rapidly becoming an important part of the stack in many organizations. Sematext has historically had a strong support for monitoring big data applications such as Elastic (aka Elasticsearch), Cassandra, Solr, S...
It's been a busy time for tech's ongoing infatuation with containers. Amazon just announced EC2 Container Registry to simply container management. The new Azure container service taps into Microsoft's partnership with Docker and Mesosphere. You know when there's a standard for containers on the table there's money on the table, too. Everyone is talking containers because they reduce a ton of development-related challenges and make it much easier to move across production and testing environm...
The 19th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Digital Transformation, Microservices and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportuni...
Deploying applications in hybrid cloud environments is hard work. Your team spends most of the time maintaining your infrastructure, configuring dev/test and production environments, and deploying applications across environments – which can be both time consuming and error prone. But what if you could automate provisioning and deployment to deliver error free environments faster? What could you do with your free time?
Monitoring of Docker environments is challenging. Why? Because each container typically runs a single process, has its own environment, utilizes virtual networks, or has various methods of managing storage. Traditional monitoring solutions take metrics from each server and applications they run. These servers and applications running on them are typically very static, with very long uptimes. Docker deployments are different: a set of containers may run many applications, all sharing the resource...
SYS-CON Events announced today that 910Telecom will exhibit at the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Housed in the classic Denver Gas & Electric Building, 910 15th St., 910Telecom is a carrier-neutral telecom hotel located in the heart of Denver. Adjacent to CenturyLink, AT&T, and Denver Main, 910Telecom offers connectivity to all major carriers, Internet service providers, Internet backbones and ...
The following fictional case study is a composite of actual horror stories I’ve heard over the years. Unfortunately, this scenario often occurs when in-house integration teams take on the complexities of DevOps and ALM integration with an enterprise service bus (ESB) or custom integration. It is written from the perspective of an enterprise architect tasked with leading an organization’s effort to adopt Agile to become more competitive. The company has turned to Scaled Agile Framework (SAFe) as ...
DevOps at Cloud Expo – being held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA – announces that its Call for Papers is open. Born out of proven success in agile development, cloud computing, and process automation, DevOps is a macro trend you cannot afford to miss. From showcase success stories from early adopters and web-scale businesses, DevOps is expanding to organizations of all sizes, including the world's largest enterprises – and delivering real results. Am...

Modern organizations face great challenges as they embrace innovation and integrate new tools and services. They begin to mature and move away from the complacency of maintaining traditional technologies and systems that only solve individual, siloed problems and work “well enough.” In order to build...

The post Gearing up for Digital Transformation appeared first on Aug. 28, 2016 03:15 PM EDT  Reads: 1,629