dineshbhagat

MyServer.java

import com.sun.net.httpserver.Filter;
import com.sun.net.httpserver.Headers;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpHandlers;
import com.sun.net.httpserver.HttpServer;

dineshbhagat

BRIN vs B-tree: a little demo

If you're not familiar with BRIN, check these easy-to-follow articles: https://www.crunchydata.com/blog/postgres-indexing-when-does-brin-win https://medium.com/geekculture/postgres-brin-index-large-data-performance-with-minimal-storage-4db6b...

Start a postgres instance and connect to it with psql or your favorite tool. And then follow the steps below.

1. Create a table and fill in with dummy date:

dineshbhagat

Reload application properties dynamically

import java.io.File
import java.util.*
import java.util.concurrent.TimeUnit
import mu.KLogging
import org.apache.commons.configuration2.FileBasedConfiguration
import org.apache.commons.configuration2.PropertiesConfiguration

dineshbhagat

• Add driver class

      // https://mvnrepository.com/artifact/org.mariadb.jdbc/mariadb-java-client
    implementation group: 'org.mariadb.jdbc', name: 'mariadb-java-client', version: '2.7.3'

• Mariadb installation Ref

dineshbhagat

1. Upgrade gradle/maven wrapper, here gradle
   Ref
   Make sure execute this program on success build.

    ./gradlew wrapper --gradle-version 5.6.4  --distribution-type all  

2. spring-boot-gradle-plugin changes,

3. bootRepackage to bootJar or bootWar

dineshbhagat

resilience4j.circuitbreaker.metrics.enabled=true
resilience4j.circuitbreaker.metrics.legacy.enabled=true

# following properties can be added for individual circuit breakers (CB-name is one of the circuit breaker, replace it)

resilience4j.circuitbreaker.instances.<CB-name>.sliding-window-type=TIME_BASED
resilience4j.circuitbreaker.instances.<CB-name>.sliding-window-size=100
resilience4j.circuitbreaker.instances.<CB-name>.minimum-number-of-calls=100
resilience4j.circuitbreaker.instances.<CB-name>.failure-rate-threshold=10

dineshbhagat

public class PascalTriangle {

// Ref: https://leetcode.com/submissions/detail/293484403/
// if you do not see "hello" as output in console, it means 2311 is prime number: 
// Ref: https://www.youtube.com/watch?v=D7AHbyAlgIA&list=PL5KkMZvBpo5CdoOxa3dqll2n6KsXqerYO&index=11
// https://en.wikipedia.org/wiki/AKS_primality_test
  public static void main(String[] args) throws Exception {
        List<BigInteger> generate = generate(2311);
        System.out.println(generate);
        for (int i = 0; i < generate.size(); i++) {

dineshbhagat

  ZigZag-Encoding
  ---------------
  
  Maps negative values to positive values while going back and
  forth (0 = 0, -1 = 1, 1 = 2, -2 = 3, 2 = 4, -3 = 5, 3 = 6 ...)

  (i >> bitlength-1) ^ (i << 1)

  with "i" being the number to be encoded, "^" being
  XOR-operation and ">>" would be arithemtic shifting-operation

dineshbhagat

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.reflect.TypeToken;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;

dineshbhagat

brew install zsh;
sh -c "$(curl -fsSL https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh)";
cd $ZSH/custom/plugins;
git clone https://github.com/zsh-users/zsh-syntax-highlighting.git && git clone https://github.com/zsh-users/zsh-autosuggestions && git clone https://github.com/zsh-users/zsh-completions;
# from now on your default shell is zsh, customize by editing ~/.zshrc file
brew tap homebrew/cask-fonts;
brew install --cask font-hack-nerd-font;
brew install coreutils

cd ~/Desktop;