Author: Sergio Lema
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Spring Batch
In this article I will show how to create a complete Spring Batch project. I will show how to configure a Job and the Steps. I will implement a Step with a reader, processor and Writer. I will implement another Step with a Tasklet.
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Jinja Templates
In this article, I show how a Flask backend can render and return Jinja templates. I will show how to use variables inside the Jinja templates, blocks and macros.
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Optimizing Joins with CTE
This week, I faced a problem with the performance of a query in PostgreSQL. I came from a cardinality result of more than 70.000.000 rows with a time response of 3 minutes to only 10 seconds.
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Python Pre-Commit
In this article I show how to configure pre-commit in a Python project to format and check the code. I will show 4 tools which will run automatically with the Git hooks.
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The CSRF Protection with Spring Security
In this article I will explain the CSRF attack, the Cross-Site Request Forgery attack. I will show how Spring Security can protect against this attack, in both a server side rendering server and with a separated frontend and the Cookie repository.
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MongoDB with Spring Data
In this article I show how connect a Spring Boot application with MongoDB. I will show how to configure a Spring Boot application to be connected to a single noSQL database as MongoDB. And I will show how to use Spring Data to request a MongoDB database.
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Unit Tests with Pytest
In this article I show how to write unit tests with Pytest. I show the parametrized tests, the conftest and the fixtures.
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Circuit Breaker: Hystrix vs Resilience4J
In this post I’ll show how to use the Circuit Breaker pattern with Hystrix and with Resilience4J.
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Mapping and Validating with Marshmallow
In this article I explain the 3-tier architecture. From that I explain the need to have a mapping with Marshmallow. I will use Marshmallow to map my database entities to JSON objects.
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Message Queuing with Apache Kafka and Spring Cloud
In this article I will show how to configure Spring Cloud to publish and read messages from Apache Kafka for the Message Queuing pattern. I will show how to configure Spring Cloud for both the raw Apache Kafka dependency and for the Stream dependency.
The Dev World - Sergio Lema 