Contract testing is famous in microservices world. When we consider less numbers of microservices, then contract testing is not so necessary.However when you look at the Amazon or Netflix microservices mesh, it is countless. Such cases it is extremely difficult for developer or tester to maintain unit/automation test suite as per the microservices development chnages. Contract testing is the best possible solution currently offered for this situation. In contract testing, a mocked service is created to represent the provider. There are commercial or opensource tools available to stimulate this. In short, contract is set of predefined requests and responses created by automation or developer team to do their testing.
Apache PDFBox and FontBox jar available can be useful here. Add these two libraries to your Maven Pom.xml or build.gradle dependencies. Then write java code to parse your PDF files to create POJOs. What is POJO in javaPOJO stands for Plain java object and it has not restrictions or class path dependency.
Google provides platform as service or PaaS via Google’s App Engine.App Engine is a cloud computing platform where development and hosting of applications can be done.Other feature is App engine scales up on demand basis when the requests are more. App Engine supports almost all development technologies like Go, Java , Python, .NET, ruby. Python web frameworks like Flask, Django all can run on App Engine.
ELK stack is a combination of 3 open-source products as below,
Elasticsearch, a search and analytics engine.
Logstash, that index the data to Elasticsearch. Logstash has a config file that has input,filter and output section. Config file looks like json file.
Kibana, a visualization tool which provides a web based GUI for a user. User can design the bar, plot reporting charts. In order to make Kibana and Elasticsearch interact, you need to make both server up and running. Then logstash will index the data to Elasticsearch. Then Kibana would read the data from Elasticsearch and visualize it.
DevOps is the practice of using set of tools, processes and practices to get good agility in software implementation to customers. It combines Dev (software development ) and Ops (information operations). DevOps shortens the development lifecycles and provides Continous Integration & Delivery. DevSecOps is when security features are included in DevOps CI/CD flow. NetOps is when network services are packaged to DevOps.
Jenkins jobs and Jenkins pipeline are essentially same, however pipeline is more staged flow of jobs. For Jenkins pipeline, Jenkinsfile is used. What is Jenkinsfile?Jenkinsfile is a text file placed in the root project directory. The Jenkinsfile has multiple stages like build, unit test, sonar test, functional, regression, integration, performance testing, deployment etc.
Flagger works are controller of the deployment workflow and helps automating the promotion of canary deployments. It utilizes the Istio’s and Prometheus metrics for analyzing application behaviors. What is Istio ? Istio is an open source service mesh that allows you to connect, monitor, secure your microservices deployment on premises or in cloud or in Kubernetes orchestration platforms. What is Prometheus?Prometheus tracks events and helps as an alerting software.
Machine learning models can be developed using TensorFlow, and orchastrated using Kubernetes and build it in Docker container. These can be combined with AWS services like CloudWatch, EKS and S3. This can basically give an API for developers to deploy their machine learning models.
What is Tensorflow?
Tensorflow is an opensource library used for machine learning specifically artificial neural networks. It provides API for various machine learning tasks. It is important to learn following terminology prior learning Tensorflow. Artificial neural networks are inspired from Animal brains that learn from experiences. Similarly neural networks learns from examples to perform its tasks than running predefined programs.
What is Keras
High level neural networks API written in python which Tensorflow utilized for building its programs.
What is Dense
Dense is the neural network layer in the tensorflow