Know about Microservice Aggregator Design Pattern.
Know Aggregator Microservice Design Pattern
The Aggregator is something that collects related items or data and displays them (combining and merging of data).
In MSA aggregator is a basic web service that internally invokes various services to get the required information that needs to be aggregated and send back to the requestor.
This pattern helps when you have the requirement of collecting data from various different services and merging the collected information.
Example:
We have two different services namely Student and Address which has their own database, and we need to gather the data from both the service/database.
Which uses a Unique ID as a reference in both databases, thus allowing us to fetch the data from both databases via the web service endpoint and combine or aggregate them with help of the new service Student’s Address which is the aggregator service.
In the next article, we will see in API Gateway design pattern.
In this article, we will see Micro service and Design Patterns.
Micro service and Design Patterns
Micro service aka MSA has become the go-solution for most of the Enterprise to build or migrate the applications. They are known to solve various snags.
In order to build effective Microservice. We need to weld on to the design patterns, which helps us to improve the performance of the application.
Let us see the below topics as part of this article:
Microservices, aka MSA aka microservice architecture, is an style that structures an application as small collection of autonomous services which is surrounded around Business domain or models.
Ethics followed while Designing Microservice Architecture
Independent & Autonomous services
Scalability
Decentralization
Robust Services
Real-Time Load balancing
Availability
Continuous delivery through DevOps integration
Seamless API integration and continuous monitoring
Let us see how to Add PNG icon to Android App. In the end you your app will use the icon you have added for the android application.
In this article I’m going to use the existing android project created as part of this article Make WordPress as Android App. This Follow the code repo used ).
How to Add PNG Icon to Android App?
You can add Image assets by Right click on the location where the image or icon need to be placed.
See below screenshot for the Menu option in Android Studio.
After right-click drawable folder, Choose New > Image Assets
You need to choose the image or icon from the browse menu under Source Asset section of Foreground Layer Tab.
Adjust the Scaling according to the image or icon output.
Go to Background Layer tab and adjust the background color or image accordingly.
Once done, click Finish (Note: Try to keep the same name as the previous icon file name, if you are replacing the icon)
Options : (Below are frequently used options with grep command) -i Ignores case -n Print the line number -c Count of matched pattern (Will not print the search line, rather it just prints the count) -r Will search folders for matching text. -v non-matched lines are printed
Try for yourself:
1) Search for any string and print count hint: use -c 2) Search entire folder for match pattern with , (This is special symbol) hint: “\,” 3) Search string by ignoring the case and also search for multiple string in a file hint: use -v and in search string you need to split using | for multiple search string.
Here we’re going to talk all about Permissions (CHOWN) in Unix?
When it comes to access for reading,writing or executing files in unix we need to play around with the permissions! So today we are going to talk all about ownership and permissions (chown).
Ownership and Permissions are important thing in unix, when it comes to files and folders access.
Changing ownership for files and folders using CHOWN
Command Usage:
chown user:group filename (Changing ownership for user and group)
chown :group filename (Only to the group)
chown user filename (Only the user)
chown user:group foldername -R (For folders and sub directory use -R)
Note: -R to apply the changes to the sub directories and files within the folder.
owner – User who created the file or folder group – User belong to the group (groups example: admin, author, sysadmin, root, local, itadmin) – varies from system to system
Try for yourself: 1) Change both owner and group from root to user1 or user1 to root hint: chown root:root file1.txt 2) Try to change for folder and its sub content (incl. sub directories) chown root:aryanz_co_in folder1 -R
