Author: Sergio Lema
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Python Logging
In this article I will show how to use the Logging library in Python. I will show how to configure the Logging library for many Handlers, Formatters and Filters.
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Spring Cloud Sleuth & Zipkin
In this article I will show how to trace requests between microservices using Spring Cloud Sleuth and Zipkin. Spring Cloud Sleuth will help me identify the logs from a single request between all the microservices. And Zipkin will show me the elapsed times at the microservices.
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Spring Security and Roles Authorization
In this article I will explain the difference between Authentication and Authorization. I will also explain how to implement the Authorization pattern with Spring Security. For that, I will use the @PreAuthorize annotation.
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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.
The Dev World - Sergio Lema 