1653116014
Fastify Zipkin | Fastify Plugin for Zipkin Distributed Tracing System
fastify/zipkin
Fastify plugin for Zipkin distributed tracing system.
Install
npm i @fastify/zipkin --save
Usage
Require the plugin and register it within Fastify, then pass the following options: { tracer, serviceName [, servicePort] }
const fastify = require('fastify')()
fastify.register(require('@fastify/zipkin'), {
serviceName: 'my-service-name',
servicePort: 3000,
httpReporterUrl: 'http://localhost:9411/api/v2/spans'
})
fastify.get('/', (req, reply) => {
reply.send({ hello: 'world' })
})
fastify.listen(3000, err => {
if (err) throw err
console.log('Server listenting on localhost:', fastify.server.address().port)
})
Download Details:
Author: fastify
Download Link: Download The Source Code
Official Website: https://github.com/fastify/fastify-zipkin
License: MIT license
#fastify #webdevelopment #javascript
What is GEEK
Buddha Community
1620633584
System Databases in SQL Server
Introduction
In SSMS, we many of may noticed System Databases under the Database Folder. But how many of us knows its purpose?. In this article lets discuss about the System Databases in SQL Server.
System Database
Fig. 1 System Databases
There are five system databases, these databases are created while installing SQL Server.
- Master
- Model
- MSDB
- Tempdb
- Resource
Master
- This database contains all the System level Information in SQL Server. The Information in form of Meta data.
- Because of this master database, we are able to access the SQL Server (On premise SQL Server)
Model
- This database is used as a template for new databases.
- Whenever a new database is created, initially a copy of model database is what created as new database.
MSDB
- This database is where a service called SQL Server Agent stores its data.
- SQL server Agent is in charge of automation, which includes entities such as jobs, schedules, and alerts.
TempDB
- The Tempdb is where SQL Server stores temporary data such as work tables, sort space, row versioning information and etc.
- User can create their own version of temporary tables and those are stored in Tempdb.
- But this database is destroyed and recreated every time when we restart the instance of SQL Server.
Resource
- The resource database is a hidden, read only database that holds the definitions of all system objects.
- When we query system object in a database, they appear to reside in the sys schema of the local database, but in actually their definitions reside in the resource db.
#sql server #master system database #model system database #msdb system database #sql server system databases #ssms #system database #system databases in sql server #tempdb system database
1595498460
Contact Tracing App: The Technology, Approach to fight COVID-19/Corona
As COVID-19 staggeringly lands blows to nations across the world, governments are considering ways to see their citizens through this pandemic. At the moment, a WHO situation report clocks the number of confirmed cases above two million along with more than one hundred thousand deaths. With vaccines dubbed as the best possible chance to tackle COVID-19 having no precise time frame of being ready, the talk is quickly shifting away to Contact Tracing Applications.
Contact tracing apps are digital solutions that use mobile technology to power the process of manual contact tracing. The apps follow a user’s movement, either by the use of Bluetooth technology, QR codes, or geo-location data while also tracking and keeping data from other user phones nearby. If one user gets diagnosed, the apps alert other users that they may have been exposed to the virus. As such, Contact Tracing Applications are being welcomed and perceived as an important approach to stem the spread of COVID-19 by providing a more accurate platform with data and information about affected individuals.
How Contact Tracing App Works
As mentioned above, contact tracing apps leverage mobile technology to trace cases of possible infection more accurately. But how exactly? Once installed and operative, the phone runs the app simultaneously with Bluetooth or location data to transmit signals with unique keys or IDs to phones in the designated range of connection. Similarly, the other phones with the app installed to detect and send back the signals.
For instance, if ‘Individual A’ has the app installed and goes outdoors to run some errands, they will interact with other individuals. In such a case, supposing all the other individuals had functional Contact Tracing Apps, each phone would exchange and store the contact data anonymously. It is important to note that the data collected only covers the app range distance to disregard irrelevant contacts and that their keys repeatedly change as individuals move. In any event that ‘Individual A’ tests positive for COVID-19 through confirmed tests, users who were previously within the proximity of ‘Individual A’ are alerted. Consequently, they are notified to check for symptoms, self-isolate, or get tested. Each time a person tests positive, the app notifies and advises the affected individuals.
In a nutshell, Contact Tracing Apps automate and supplement the traditional concept of tracing contacts to achieve extensive and realistic results in the least time possible.
What are the Benefits of Contact Tracing Apps?
Contract Tracing Apps are assets that offer indispensable solutions to health institutions and the public against COVID-19. There are several reasons why many governments are urging their citizens to use digital contact tracing apps to combat the spread of COVID-19. They include:
- The apps are more effective than manual tracing. While not perfect, their predictive algorithms frequently observe individuals detect new cases and analyze the probability one was infected. If one has contact with an asymptomatic individual, they are immediately notified and advised accordingly. Therefore, this saves time, energy, and resources that would have otherwise been overused.
- Contact tracing apps facilitate the relaxation of imposed restrictions or lockdowns. With a large number of infected people identified by the apps and put under surveillance, healthy citizens can be allowed to go about their duties. This may be a significant turning point to try and revive economies.
- Users’ private data is encrypted and secured. Even if you test positive, other users will only get notifications of possible infections. Your information is protected from both other users and developers of the app.
- They will increase the capacity to test and detect COVID-19 cases. With infected users alert, users who come in contact with affected persons come forward to be tested and treated with a higher recovery chance.
Future of Contact Tracing Apps?
Currently, the role of contact tracing apps is limited to accurately identifying infected individuals and their contacts as well as facilitating a quicker response to the Covid-19 threat.
Beyond that, the use of contact tracing apps is projected to take a different turn. One key area bound to change is how people’s privacy is handled. Tech institutions are under growing pressure to devise ways to develop privacy-preserving Contact Tracing Apps.
This will earn the users-trust, which is a pillar for these apps to help contain the disease. Technically, the technology will also have to improve drastically. The apps will have to seamlessly integrate with the user’s phone lifestyle causing minimal or no interference. With most applications having an open-source code, Artificial Intelligence, Beacon Technology, and Big Data solutions will be increasingly harnessed to power and improve them. The apps may also cut across various types of industries apart from health institutions.
How Can It Help to Trace COVID-19 and Reduce the Spread of the Virus?
Contact Tracing Apps will effectively help stem lowering the cases of COVID-19. By using the apps, officials are able to monitor high-risk individuals easily. Also, should any new case arise, both users and health officials get notified they will swiftly act to trace, test, or isolate infected individuals.
Unlike traditional contact tracing, which may not get all contacts, these apps ensure that once Covid-19 cases are detected, they are all treated early, and those other individuals are not exposed to the infection. They also ward off users from high-risk areas. In the long run, they help break the COVID-19 chain by preventing further spread. Illustratively, an online publication by CNBC states that more than 500,000 using a Singapore-registered mobile number downloaded the TraceTogether app within the first 24 hours of its launch. Subsequently, together with other government efforts, Singapore has since lowered the infection rate and eased restrictions.
If Contact Tracing Apps are implemented and used alongside other policies, we may as well be a few steps way to curbing this virus.
#android app #ios app #mobile app development #news #technology #contact tracing #contact tracing app #contact tracing app approach #contact tracing app technology #contact tracing coronavirus #contact tracing process #corona virus detecting app #corona virus tracing app #corona virus tracker #corona virus tracker live
1653116014
Fastify Zipkin | Fastify Plugin for Zipkin Distributed Tracing System
fastify/zipkin
Fastify plugin for Zipkin distributed tracing system.
Install
npm i @fastify/zipkin --save
Usage
Require the plugin and register it within Fastify, then pass the following options: { tracer, serviceName [, servicePort] }
const fastify = require('fastify')()
fastify.register(require('@fastify/zipkin'), {
serviceName: 'my-service-name',
servicePort: 3000,
httpReporterUrl: 'http://localhost:9411/api/v2/spans'
})
fastify.get('/', (req, reply) => {
reply.send({ hello: 'world' })
})
fastify.listen(3000, err => {
if (err) throw err
console.log('Server listenting on localhost:', fastify.server.address().port)
})
Download Details:
Author: fastify
Download Link: Download The Source Code
Official Website: https://github.com/fastify/fastify-zipkin
License: MIT license
1622722796
How To Customize WordPress Plugins? (4 Easy Ways To Do)
WordPress needs no introduction. It has been in the world for quite a long time. And up till now, it has given a tough fight to leading web development technology. The main reason behind its remarkable success is, it is highly customizable and also SEO-friendly. Other benefits include open-source technology, security, user-friendliness, and the thousands of free plugins it offers.
Talking of WordPress plugins, are a piece of software that enables you to add more features to the website. They are easy to integrate into your website and don’t hamper the performance of the site. WordPress, as a leading technology, has to offer many out-of-the-box plugins.
However, not always the WordPress would be able to meet your all needs. Hence you have to customize the WordPress plugin to provide you the functionality you wished. WordPress Plugins are easy to install and customize. You don’t have to build the solution from scratch and that’s one of the reasons why small and medium-sized businesses love it. It doesn’t need a hefty investment or the hiring of an in-house development team. You can use the core functionality of the plugin and expand it as your like.
In this blog, we would be talking in-depth about plugins and how to customize WordPress plugins to improve the functionality of your web applications.
What Is The Working Of The WordPress Plugins?
Developing your own plugin requires you to have some knowledge of the way they work. It ensures the better functioning of the customized plugins and avoids any mistakes that can hamper the experience on your site.
1. Hooks
Plugins operate primarily using hooks. As a hook attaches you to something, the same way a feature or functionality is hooked to your website. The piece of code interacts with the other components present on the website. There are two types of hooks: a. Action and b. Filter.
A. Action
If you want something to happen at a particular time, you need to use a WordPress “action” hook. With actions, you can add, change and improve the functionality of your plugin. It allows you to attach a new action that can be triggered by your users on the website.
There are several predefined actions available on WordPress, custom WordPress plugin development also allows you to develop your own action. This way you can make your plugin function as your want. It also allows you to set values for which the hook function. The add_ action function will then connect that function to a specific action.
B. Filters
They are the type of hooks that are accepted to a single variable or a series of variables. It sends them back after they have modified it. It allows you to change the content displayed to the user.
You can add the filter on your website with the apply_filter function, then you can define the filter under the function. To add a filter hook on the website, you have to add the $tag (the filter name) and $value (the filtered value or variable), this allows the hook to work. Also, you can add extra function values under $var.
Once you have made your filter, you can execute it with the add_filter function. This will activate your filter and would work when a specific function is triggered. You can also manipulate the variable and return it.
2. Shortcodes
Shortcodes are a good way to create and display the custom functionality of your website to visitors. They are client-side bits of code. They can be placed in the posts and pages like in the menu and widgets, etc.
There are many plugins that use shortcodes. By creating your very own shortcode, you too can customize the WordPress plugin. You can create your own shortcode with the add_shortcode function. The name of the shortcode that you use would be the first variable and the second variable would be the output of it when it is triggered. The output can be – attributes, content, and name.
3. Widgets
Other than the hooks and shortcodes, you can use the widgets to add functionality to the site. WordPress Widgets are a good way to create a widget by extending the WP_Widget class. They render a user-friendly experience, as they have an object-oriented design approach and the functions and values are stored in a single entity.
How To Customize WordPress Plugins?
There are various methods to customize the WordPress plugins. Depending on your need, and the degree of customization you wish to make in the plugin, choose the right option for you. Also, don’t forget to keep in mind that it requires a little bit of technical knowledge too. So find an expert WordPress plugin development company in case you lack the knowledge to do it by yourself.
1. Hire A Plugin Developer3
One of the best ways to customize a WordPress plugin is by hiring a plugin developer. There are many plugin developers listed in the WordPress directory. You can contact them and collaborate with world-class WordPress developers. It is quite easy to find a WordPress plugin developer.
Since it is not much work and doesn’t pay well or for the long term a lot of developers would be unwilling to collaborate but, you will eventually find people.
2. Creating A Supporting Plugin
If you are looking for added functionality in an already existing plugin go for this option. It is a cheap way to meet your needs and creating a supporting plugin takes very little time as it has very limited needs. Furthermore, you can extend a plugin to a current feature set without altering its base code.
However, to do so, you have to hire a WordPress developer as it also requires some technical knowledge.
3. Use Custom Hooks
Use the WordPress hooks to integrate some other feature into an existing plugin. You can add an action or a filter as per your need and improve the functionality of the website.
If the plugin you want to customize has the hook, you don’t have to do much to customize it. You can write your own plugin that works with these hooks. This way you don’t have to build a WordPress plugin right from scratch. If the hook is not present in the plugin code, you can contact a WordPress developer or write the code yourself. It may take some time, but it works.
Once the hook is added, you just have to manually patch each one upon the release of the new plugin update.
4. Override Callbacks
The last way to customize WordPress plugins is by override callbacks. You can alter the core functionality of the WordPress plugin with this method. You can completely change the way it functions with your website. It is a way to completely transform the plugin. By adding your own custom callbacks, you can create the exact functionality you desire.
We suggest you go for a web developer proficient in WordPress as this requires a good amount of technical knowledge and the working of a plugin.
#customize wordpress plugins #how to customize plugins in wordpress #how to customize wordpress plugins #how to edit plugins in wordpress #how to edit wordpress plugins #wordpress plugin customization
1597689240
Resilience in Deep Systems
When using microservices architecture to build a successful product, a product that needs to rapidly grow, sooner or later, you realize that your system becomes “deep.”
The depth of a system can be considered as the number of microservices layers in the application stack.
Today’s forefront cloud technologies, such as Service Mesh, Containers, and Serverless computing, enable teams to easily add many microservices layers to their system.
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A microservice within such a system is not actually independent - it relies on other microservices and vice versa.
When microservices communication grows deep, it complicates the company’s ability to quickly diagnose errors or performance bottlenecks.
Therefore, deep systems are a serious challenge for R&D teams who want to sustain resilience, fault-tolerance, and performance.
Without the right mindset and the right tooling, the product and it’s customers will be jeopardized.
It’s possible to build complex systems, with deep chains of microservices, without compromising on resilience.
Here are 3 ingredients that can help you nourish resilience in deep systems.
1. Service granularity
Don’t go with the hype; correspond to a real business capability.
When designing complex applications using microservice architecture, we’re looking to define a set of cohesive and loosely-coupled services. One of the biggest questions in that regard is, how will we break down our application into microservices?
Because microservices architecture essentially follows the Unix philosophy of “Do one thing and do it well,” you could simply say that each atomic function should be a microservice (i.e. the hype). While in theory it sounds perfect, simply following that philosophy can create an enormous amount of microservices. Are you going to be successful in maintaining that many services effectively?
I’m going to provision the “integer” service in us-west-1
Said once a hyped developer
In reality, we found that defining microservices that correspond to a real business capability will result in a sane amount of self-contained pieces of business functionality. Those pieces can still be very cohesive, loosely coupled, scale well, be testable, built, and owned by a small enough team. All of which are the pillars of microservices.
Moreover, it’s a common practice to avoid code duplications in multiple microservices by creating a shared library, i.e. DRY (Don’t Repeat Yourself). DRY is an important concept. Yet, sometimes too hyped. In reality, we found that sometimes shared libraries couple our microservices to each other, reducing the effectiveness of the isolation and independence between the microservices. It also slows down teams from making changes, since they are not always fully aware of the usage patterns of other teams. In fact, balancing microservices granularity goes hand in hand with balancing the right amount of shared libraries. Both shared libraries and code duplication are a burden in hyper-granular microservices architecture. But when keeping a balanced microservice granularity, the price of code duplication can pay off as increased independence.
#distributed tracing #distributed systems #microservices #complex systems #architecture & design #development #article