There’s one situation where we need to help ElasticSearch to understand the structure of our data in order to be able to query it fully – when dealing with arrays of complex objects.
ElasticSearch has one great feature that it allows us to search in nested properties of complex JSON objects. It’s normally used for list of objects inside the parent document. Just to mention I am using ElasticSearch 1.4 for legacy reasons. Here is an example of the model we have stored locally in ES: Read more ›
I’ve upgraded my dev server to latest version of Debian. Everything was going smoothly until I’ve got an error from mysql-server that it cannot be installed due to an error. I checked few websites that I have there running and all of them were down. Checked the logs but nothing obvious was there, eventually I realised the MySQL process was not running at all which was understandable considering the previous failure to install myslq server. So this was my error:
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I was playing with PHP the other day and was trying to fetch and rename 1000s of files I have stored locally on my machine. Seemingly PHP isn’t the best language to that operation Python or even BASH could do the job though it was nice to give it a try. So this is what I came up, simple and straightforward.
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Dates as a concept are seamingly simple and straight forward. Though in programming world those could be rather complex starting from format, representation, time zones, machine default configuration going through different calendars and date manipulations.
In this post I won’t to give a quick tip on handling dates in an application that I am building. It will be short post, I promise.
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Posted in API
, Small Tips
, Spring MVC
Tagged with: API
Polymorphic type handling based on JSON property
Building an API that supports inheritance could be quite crucial. Imagine the case where you want to have an endpoint that stores a profile data for a given provider and that provider could be your main website or any 3rd party platform that can provide the data. We might have a base Profile class which in our case would be abstract class with firstName and lastName fields and an abstract method to provide the name of the actual profile provider getProfile().
You can do all of that quite easily with few Jackson annotations, for polymorphic types, on the base class and on the children that extend the base class. No more words here is an example: Read more ›
Many people go for different solutions and sometimes overcomplicate their applciation with message queues like ActiveMQ, RabbitMQ and other options out there. Though this is yet another part in the application architecture that would require maintenance and support and it’s also a possible failiure point.
There are good reasons to use this approach but in most cases you can get through with normal in-memmory queue with multi-threading. Read more ›
What happens if you need to make changes to your API?
If you’re making additions to the API – e.g., adding services or adding fields to your services – you likely don’t need to do anything more to notify users than to tell them about the changes.
But what happens if you need to make a change that will affect users?
- Adding authentication
- Adding authorization rules
- Removing a service
- Removing or renaming fields inside services
Such changes as these impact your existing users. At times like these, you need to create a new version of your API.
But how do you do that? Read more ›
When I build apps or add new functionality to Symfony2 I build it into a separate bundle, thus trying to keep the structure modular which is generally a good practice as everyone knows. Keeping all parts of the bundle together makes it easy to maintain and also easy to change the configurations as they reside in same place as the code itself.
In this post I’ll show you how to make Symfony2 core discover your config.yml and services files defined in your custom bundle.
Create new bundle
First let’s create a new bundle that we’ll use as a demo. Run following command in the terminal: Read more ›
I am using Magnolia CMS 5.4 and I want to build a module that will render some content of a page and expose it over REST API. The task is simple but not sure how to approach it and/or where to start.
I want my module to generate partial template or an area of a template for a given reference, let’s say that is “header”. I need to render the header template/area get the HTML and return that as a response to another system.
First thing the rendering works based on different renderers and those could be JCR, plain text or Freemarker renderer. In Magnolia those are decided and used in RenderingEngine and the implementation: DefaultRenderingEngine. The rendering engine will allow you to render a whole page node which is one step closer to what I am trying to achieve. So let’s see how could this be done:
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