Category: Scala

Preparing for the Mobile World – Part II

Post author By Anupam Chandra (AC)
Post date December 27, 2011
Categories In Lift, REST, Scala, Virtual Queues, Web Services
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Continuing with our effort to open up queues for mobile devices, we need to make one more modification to the server before we code the actual mobile interface either on the iOS or on Android. We have a Socket open on the server already that will be used for real time queue status updates to […]

Preparing for the Mobile World

Post author By Anupam Chandra (AC)
Post date December 22, 2011
Categories In Lift, Mobile, Scala, Software
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So we have a web interface for our Virtual Queues. That’s a good start, but to make the queues really useful, they need to be available from anywhere. With the flooding of smart phone and tablets in the market, we need to open our queues up for use from these devices. If you are in […]

Lift it to the web

Post author By Anupam Chandra (AC)
Post date December 16, 2011
Categories In Lift, Scala, Software, Virtual Queues
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We have the beginnings for our Virtual Queues. We have the concept of a Token and a Dispenser of tokens. We have made these thread safe so we are guaranteed that everyone requesting a token gets a unique one. At this point we can create a simple web interface on top of the token dispenser […]

Tokens and TokenDispenser

Post author By Anupam Chandra (AC)
Post date December 12, 2011
Categories In Scala, Software
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The NumberDispenser developed so far is a generic object that dispenses numbers. In and of itself, it does not relate directly to the problem at hand. We need to encapsulate it as part of domain objects that are more natural for the Virtual Queuing application that we are developing. In today’s blog we will introduce […]

Thread Safe Number Dispenser

Post author By Anupam Chandra (AC)
Post date December 8, 2011
Categories In Scala, Software
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The NumberDispenser class that we introduced in the previous blogs works fine for a single thread. However, if multiple threads start requesting for numbers, there is a possibility that two threads might get the same number. The problem is that while a thread is in the dispense method it might be preempted right after it […]

Stream of numbers

In the previous blog we created a NumberDispenser class that dispenses numbers to its clients. It has a counter that keeps track of the next number to dispense. In this blog we will explore an alternate mechanism for handing out these numbers. The idea of this blog is to learn the Scala language and although […]

Virtual Queues on Scala, Groovy, and Ruby

Post author By Anupam Chandra (AC)
Post date December 5, 2011
Categories In Scala, Software
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Polyglot Learning We are going to learn Scala, Lift, Groovy, Grails, Ruby and Rails, iPhone, and Android app development using a simple application. We will develop a virtual queuing application. When you go to a post office or to DMV, you have to take a number token that places you in a queue. The people […]