After numerous requests to produce a Flutter and MongoDB combo, I’ve devoted the time to produce a fullstack Flutter and MongoDb Cloud mini-course. We will build a contacts list application that manages contacts in MongoDB Cloud Atlas database. We will also implement a Dart backend server for talking to MongoDB datastore. This app will be built for both Flutter mobile and web platforms.
You will need a MongoDB Cloud Account to create a Project and Cluster. This will give us an environment with MongoDB installed and a user to connect to that MongoDB instance.
The contents of the mini-course are as follows:
00:07 App Demo
02:08 Setup MongoDB Cloud Atlas Project and Cluster
03:18 Connect to MongoDB Cluster via Terminal
04:32 Examine codebase and dependencies
05:13 Connect to MongoDB from codebase
06:14 Create server and initial route
07:30 Add POST and DELETE endpoints
09:59 Implement initial contacts screen
11:44 Implements “No contacts” view
13:41 Implement contact addition functionality
14:59 Style ListTile widget
16:22 Refactor NoContacts widget
17:01 Create ContactListing widget
18:20 Using the Faker package
18:53 Adding contact deletion functionality
20:07 Implements ContactsApi class
23:26 Create Contact PODO
28:21 Implement contact creation method on api class
29:51 Running app on Flutter Web
Clone and check out the starter branch on the Github repo. This will provide the correct setup to follow along in the Fullstack Flutter and MongoDB Cloud mini-course.
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Flutter Google cross-platform UI framework has released a new version 1.20 stable.
Flutter is Google’s UI framework to make apps for Android, iOS, Web, Windows, Mac, Linux, and Fuchsia OS. Since the last 2 years, the flutter Framework has already achieved popularity among mobile developers to develop Android and iOS apps. In the last few releases, Flutter also added the support of making web applications and desktop applications.
Last month they introduced the support of the Linux desktop app that can be distributed through Canonical Snap Store(Snapcraft), this enables the developers to publish there Linux desktop app for their users and publish on Snap Store. If you want to learn how to Publish Flutter Desktop app in Snap Store that here is the tutorial.
Flutter 1.20 Framework is built on Google’s made Dart programming language that is a cross-platform language providing native performance, new UI widgets, and other more features for the developer usage.
Here are the few key points of this release:
In this release, they have got multiple performance improvements in the Dart language itself. A new improvement is to reduce the app size in the release versions of the app. Another performance improvement is to reduce junk in the display of app animation by using the warm-up phase.
If your app is junk information during the first run then the Skia Shading Language shader provides for pre-compilation as part of your app’s build. This can speed it up by more than 2x.
Added a better support of mouse cursors for web and desktop flutter app,. Now many widgets will show cursor on top of them or you can specify the type of supported cursor you want.
Autofill was already supported in native applications now its been added to the Flutter SDK. Now prefilled information stored by your OS can be used for autofill in the application. This feature will be available soon on the flutter web.
A new widget for interaction
InteractiveViewer is a new widget design for common interactions in your app like pan, zoom drag and drop for resizing the widget. Informations on this you can check more on this API documentation where you can try this widget on the DartPad. In this release, drag-drop has more features added like you can know precisely where the drop happened and get the position.
In this new release, there are many pre-existing widgets that were updated to match the latest material guidelines, these updates include better interaction with
DatePicker with support for date range and time picker with the new style.
Other than these widget updates there is some update within the project also like in
pubspec.yaml file format. If you are a flutter plugin publisher then your old
pubspec.yaml is no longer supported to publish a plugin as the older format does not specify for which platform plugin you are making. All existing plugin will continue to work with flutter apps but you should make a plugin update as soon as possible.
Visual Studio code flutter extension got an update in this release. You get a preview of new features where you can analyze that Dev tools in your coding workspace. Enable this feature in your vs code by
_dart.previewEmbeddedDevTools_setting. Dart DevTools menu you can choose your favorite page embed on your code workspace.
The updated the Dev tools comes with the network page that enables network profiling. You can track the timings and other information like status and content type of your** network calls** within your app. You can also monitor gRPC traffic.
Pigeon is a command-line tool that will generate types of safe platform channels without adding additional dependencies. With this instead of manually matching method strings on platform channel and serializing arguments, you can invoke native class and pass nonprimitive data objects by directly calling the
There is still a long list of updates in the new version of Flutter 1.2 that we cannot cover in this blog. You can get more details you can visit the official site to know more. Also, you can subscribe to the Navoki newsletter to get updates on these features and upcoming new updates and lessons. In upcoming new versions, we might see more new features and improvements.
You can get more free Flutter tutorials you can follow these courses:
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A multi-cloud approach is nothing but leveraging two or more cloud platforms for meeting the various business requirements of an enterprise. The multi-cloud IT environment incorporates different clouds from multiple vendors and negates the dependence on a single public cloud service provider. Thus enterprises can choose specific services from multiple public clouds and reap the benefits of each.
Given its affordability and agility, most enterprises opt for a multi-cloud approach in cloud computing now. A 2018 survey on the public cloud services market points out that 81% of the respondents use services from two or more providers. Subsequently, the cloud computing services market has reported incredible growth in recent times. The worldwide public cloud services market is all set to reach $500 billion in the next four years, according to IDC.
By choosing multi-cloud solutions strategically, enterprises can optimize the benefits of cloud computing and aim for some key competitive advantages. They can avoid the lengthy and cumbersome processes involved in buying, installing and testing high-priced systems. The IaaS and PaaS solutions have become a windfall for the enterprise’s budget as it does not incur huge up-front capital expenditure.
However, cost optimization is still a challenge while facilitating a multi-cloud environment and a large number of enterprises end up overpaying with or without realizing it. The below-mentioned tips would help you ensure the money is spent wisely on cloud computing services.
Most organizations tend to get wrong with simple things which turn out to be the root cause for needless spending and resource wastage. The first step to cost optimization in your cloud strategy is to identify underutilized resources that you have been paying for.
Enterprises often continue to pay for resources that have been purchased earlier but are no longer useful. Identifying such unused and unattached resources and deactivating it on a regular basis brings you one step closer to cost optimization. If needed, you can deploy automated cloud management tools that are largely helpful in providing the analytics needed to optimize the cloud spending and cut costs on an ongoing basis.
Another key cost optimization strategy is to identify the idle computing instances and consolidate them into fewer instances. An idle computing instance may require a CPU utilization level of 1-5%, but you may be billed by the service provider for 100% for the same instance.
Every enterprise will have such non-production instances that constitute unnecessary storage space and lead to overpaying. Re-evaluating your resource allocations regularly and removing unnecessary storage may help you save money significantly. Resource allocation is not only a matter of CPU and memory but also it is linked to the storage, network, and various other factors.
The key to efficient cost reduction in cloud computing technology lies in proactive monitoring. A comprehensive view of the cloud usage helps enterprises to monitor and minimize unnecessary spending. You can make use of various mechanisms for monitoring computing demand.
For instance, you can use a heatmap to understand the highs and lows in computing visually. This heat map indicates the start and stop times which in turn lead to reduced costs. You can also deploy automated tools that help organizations to schedule instances to start and stop. By following a heatmap, you can understand whether it is safe to shut down servers on holidays or weekends.
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Flutter is an open-source UI toolkit for mobile developers, so they can use it to build native-looking** Android and iOS** applications from the same code base for both platforms. Flutter is also working to make Flutter apps for Web, PWA (progressive Web-App) and Desktop platform (Windows,macOS,Linux).
Flutter was officially released in December 2018. Since then, it has gone a much stronger flutter community.
There has been much increase in flutter developers, flutter packages, youtube tutorials, blogs, flutter examples apps, official and private events, and more. Flutter is now on top software repos based and trending on GitHub.
What is Flutter? this question comes to many new developer’s mind.
Flutter means flying wings quickly, and lightly but obviously, this doesn’t apply in our SDK.
So Flutter was one of the companies that were acquired by **Google **for around $40 million. That company was based on providing gesture detection and recognition from a standard webcam. But later when the Flutter was going to release in alpha version for developer it’s name was Sky, but since Google already owned Flutter name, so they rename it to Flutter.
Flutter is used in many startup companies nowadays, and even some MNCs are also adopting Flutter as a mobile development framework. Many top famous companies are using their apps in Flutter. Some of them here are
and many more other apps. Mobile development companies also adopted Flutter as a service for their clients. Even I was one of them who developed flutter apps as a freelancer and later as an IT company for mobile apps.
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The moving of applications, databases and other business elements from the local server to the cloud server called cloud migration. This article will deal with migration techniques, requirement and the benefits of cloud migration.
In simple terms, moving from local to the public cloud server is called cloud migration. Gartner says 17.5% revenue growth as promised in cloud migration and also has a forecast for 2022 as shown in the following image.
#cloud computing services #cloud migration #all #cloud #cloud migration strategy #enterprise cloud migration strategy #business benefits of cloud migration #key benefits of cloud migration #benefits of cloud migration #types of cloud migration
Why docker? In a traditional deployment, we will encounter different machines, different versions dependent on compatibility and other issues, resolve this problem typically consume a lot of time, and have to execute the deployment of the unified environment on different machines is a lengthy work . In addition, different environments, for example, further comprising a cost managed Dev / Test / Prod like. To solve these problems, Docker should be shipped out. MongoDB online training helps you to learn more effectively.
Docker may use different operating Container different components (e.g. node.js web server, MongoDB, Messaging System, etc.), and these Containers can be run on the same physical host, while no influence on each other (i.e., each have their own execution environment dependent). Such as:
By the graph we can see, Docker Container is a shared Kernel, and executed on Docker layer. Docker and Hypervisor (the virtualization process control) is not the same: Docker is not virtual, not run different OS Kernel and on the same underlying hardware, its main purpose is to use containers of using the same set of different applications and OS Kernel execution. The traditional virtualization architecture:
This virtualization of the infrastructure will largely use of hardware resources, and the VM image is generally GB-level data. The Docker Container is a lightweight resource size is the amount of MB level. This makes Docker Container start faster, usually second level. The president of the VM starts much time, because of the need to start the entire OS.
Docker Installation and Start
In Linux, you may be used directly yum or apt-get installation, such as:
sudo yum install -y docker
sudo /etc/init.d/docker start
sudo docker run hello-world
Basic Docker command
The implementation of a docker container, specify parameters for the image name, if this image does not exist locally, it will download from dockerhub, for example:
sudo Docker RUN Ubuntu
Unable to find image ‘ubuntu:latest’ locally
latest: Pulling from library/ubuntu
7ddbc47eeb70: Pull complete
c1bbdc448b72: Pull complete
8c3b70e39044: Pull complete
45d437916d57: Pull complete
Status: Downloaded newer image for ubuntu:latest
List the containers currently running. You can use docker ps -a to view the status of all containers.
docker stop <container_name>
Stop a docker container. But this docker container can still be docker ps -a command lists.
docker rm <container_name>
Removing a docker container.
List all images.
docker rmi <image_name>
Remove one image. Before removing the need to remove all the container is being used in this image.
To pull a local image, performed after the docker run, you will not go DockerHub pull mirror. MongoDB training for more skills and techniques.
Executes the specified command within a docker container. The (7e2290cbe2f7 of docker id):
docker exec 7e2290cbe2f7 cat /etc/release
Docker Run command Advanced
1. Specify the image, such as:
docker run ubuntu:17.04
2. attach to the container in a running, such as:
docker run -d training/webapp
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
fdd161c7d3f3 training/webapp “python app.py” 19 seconds ago Up 19 seconds 5000/tcp vibrant_hermann
docker attach eager_johnson
for outputting attach points to the current instance of the container stdout
3. docker run -i designated waiting stdin input
After the execution of a sample web app, we can see the following output:
docker run training/webapp
At this point, port 5000 is bound to a private network ip, for example: we look at the internal ip of container:
docker exec da16b96211f6 ifconfig
eth0 Link encap:Ethernet HWaddr 02:42:ac:11:00:02
inet addr:172.17.0.2 Bcast:172.17.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1186 (1.1 KB) TX bytes:0 (0.0 B)
This can be seen ip is 172.17.0.2, and our host instance ip is 10.0.0.83. So, if a simple example of using the host ip: 5000, is a not visit this page. Here we need to do port mapping, for example:
docker run -p 80:5000 training/webapp
Container and can start more, use a different port mapping, for example:
docker run -p 8000:5000 training/webapp
This allows us to deploy two web server, listening on port 8000 external ports are already examples of port 80.
4. Volume Mapping
Docker internal container has its own file system, the file system is isolated from the outside. We can also roll in the docker container external volume mapping. So that after the destruction of container, where volume data is still stored locally. MongoDB online course from industrial experts.
E.g: docker run –v /opt/datadir/:/var/lib/mysql mysql
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