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📚 Micro services Architecture and Design patterns.
📚 Data Structures and Algorithm
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Data Structures and Algorithms

Data Structures and Algorithms

Data Structures and Algorithms

Data Structures and Algorithms

Data Structures

The programmatic way of storing data, so that it can be used efficiently. Almost every enterprise application uses various types of data structures in one or the other way.

Algorithms

    Algorithms is a step-by-step   e programmatic way of storing data, so that it can be used efficiently. Almost every enterprise application uses various types of data structures in one or the other way.

Why do we need to learn Data Structures and Algorithms?

    Every day the complexity of applications are increasing which result in more complex and rich sets of data, due to the complexity we generally face the following 3 types of problems every day.

Problems faced by the large enterprise or corporate (service and data):

  1. Data Searching: Consider users registered in social app is more than 1 million, if we want to search for one person in that 1 million, the search operation need to be performed on that 1 million user records. Thus the search operation slows down every time new user data is stored.
  2. Processor capacity/speed: Capacity of processor need to be very high to handle such large sets of data. Failing to do so will cause poor performance and bad experience to the users.
  3. Too-many requests: Everyone hold PC/Laptop, Mobile devices and IoT gadgets which connects to the service to perform some operation on the data. Thus the number of service request sent and received by the devices and the server are way many. Even the fastest server might fail to respond sometimes.

How to solve the above problems?

    To solve the above 3 problems (Data Searching, Processor capacity/speed & Too-many requests) we can use the Data Structures.

    Data can be organized in a way that data is categorized and sorted before searching, thus allowing us to search instantly.

Exactly what is that we are going to do with Data structures and algorithms?

    As we already know the Algorithms is step-by-step procedure for performing an operation. And that operations are used for manipulating the data. Let’s us see the operations or the categories of algorithms.

Categories of algorithms:

  • Search
  • Sort
  • Insert
  • Update
  • Delete
Data Structures and Algorithm - Categories

 

In the next article in details about the algorithms and the data structures implementation with example.

 

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WeCanCode-Author

WeCanCode-Author

January 08, 2022

Senior Developer | Java & C#.NET | 10++ years of IT experience.

Planning to learn ReactJS or Angular or Flutter.!

What are the Saga design pattern and types available?

What are the Saga design pattern and types available?

What are the Saga design pattern and types available?

Today we will see what are the Saga Design Pattern and types available.

Previously we saw about What is Microservice? and the principles followed while developing MSA and the available design patterns.

What are the Saga design pattern and types available?

The Saga Pattern is a microservices architectural pattern to implement a transaction that extends multiple services.

A saga is a sequence of local transactions. Each service in a saga performs its own transaction and publishes an event. The other services listen to that event and perform the next local transaction. If one transaction fails for some reason, the saga also executes compensating transactions to undo the impact of the preceding transactions.

Example:

Consider a Food delivery service flow, When a user places an order, below could be the flow.

  1. The food ordering service creates an order. At this point, the order is in PENDING status.
  2. With the Saga pattern, it contacts the restaurant via the restaurant service.
  3. The restaurant service attempts to place an order with the selected restaurant, Once the order is received by Restaurant it sends back an ORDER_ACCEPTED (if the order is accepted) or ORDER_REJECTED (if the order cannot be accepted) status.
  4. The saga received the status ORDER_ACCEPTED or ORDER_REJECTED status and process the response to the customer accordingly.
  5. The food order service then changes the status of the order, if the order is accepted then it displays an order confirmation message if the order is rejected it display an apologies message and suggest alternative restaurants.

What are the sage design pattern and types available?

Types of Saga:

  1. Orchestration-based saga
  2. Choreography-based saga

In the next article, we will see in detail about the Type of Saga design patterns.

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WeCanCode-Author

WeCanCode-Author

December 07, 2021

Senior Developer | Java & C#.NET | 10++ years of IT experience.

Planning to learn ReactJS or Angular or Flutter.!

What is the Circuit breaker design pattern?

What is the Circuit breaker design pattern?

What is the Circuit breaker design pattern?

Today we will see what is the Circuit breaker Design Pattern is.

Previously we saw about What is Microservice? and the principles followed while developing MSA and the available design patterns.

Circuit breaker design pattern?

As the name suggests the Circuit breaker design pattern is used to stop the process of request and return with the response if a service is not working.

 This design pattern can improve the stability and flexibility of an application.

 In a distributed environment, calls to remote services and resources can fail due to transient faults, such as slow network connection, timeouts, or the resource being over-committed or temporarily unavailable. These faults typically fix themselves after a short period of time.

 However there can also be situations where faults are due to unforeseen events, that might take longer to fix. These faults vary from partial loss of connectivity to complete failure of a service. In these situations, it might be pointless for an application to keep retrying an operation that is unlikely to succeed, instead, the application should accept that the operation has failed and handled this failure accordingly.

 A circuit breaker pattern can prevent an application from repeatedly trying to execute an operation that’s likely to fail. Allowing it to continue without waiting for the fault to be fixed or the utilization of resources does not kill the CPU and memory.

 It also enables an application to detect whether the fault has been resolved.

How does the Circuit breaker work?

A client should invoke a remote service via a proxy. When the number of consecutive failures crosses a threshold, the circuit breaker trips, and for the duration of a timeout period all attempts to invoke the remote service will fail immediately. After the timeout expires the circuit breaker allows a limited number of test requests to pass through. If those requests succeed the circuit breaker resumes normal operation. Otherwise, if there is a failure the timeout period begins again.

What is the Circuit breaker design pattern?

Circuit breaker design pattern

Example:

Consider we have Video Upload and View service when there is a failure in one of the services which triggers the Circuit open and enables the proxy service.

In the next article, we will see the Decomposition design pattern.

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WeCanCode-Author

WeCanCode-Author

November 30, 2021

Senior Developer | Java & C#.NET | 10++ years of IT experience.

Planning to learn ReactJS or Angular or Flutter.!

What is the CQRS design pattern?

What is the CQRS design pattern?

What is the CQRS design pattern?

Today we will see what is the CQRS – Command query responsibility segregator Design Pattern is.

Previously we saw about What is Microservice? and the principles followed while developing MSA and the available design patterns.

Command query responsibility segregator (CQRS) design pattern?

CQRS stands for Command Query responsibility segregator, a design pattern that separates the read and update operations for data.

In traditional architecture, the same data mode is used to query and update the data in a database, This is how the CRUD operations work. With CQRS the read and update operations are separated into two parts, Command and Query.

The command part will handle all the CREATE, UPDATE, DELETE requests, while the Query part will handle all the READ (Materialize view) requests.

 Advantages of CQRS:

  • Performance
  • Scalability
  • Improves Security
  • It also prevents update commends from causing merge conflicts at the domain level

What is the CQRS design pattern?

Example:

 Consider we have Video Services, One for Uploading (Write Operation) and another for viewing (Read Operation).

Where Uploading will perform Create, Update, Delete operations. And the other service on viewing will perform a Select operation to read the videos and their metadata.

In the next article, we will see the Circuit breaker design pattern.

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WeCanCode-Author

WeCanCode-Author

November 28, 2021

Senior Developer | Java & C#.NET | 10++ years of IT experience.

Planning to learn ReactJS or Angular or Flutter.!

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