David Kumar

38 code snips · on codesnips 5 months

Senior Java Developer with 12+ years building enterprise applications. Expert in Spring Boot, microservices, and cloud-native architectures. Passionate about clean code, design...

yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: user-service
  labels:
    app: user-service

Kubernetes deployment configuration

java kubernetes k8s
by David Kumar 5 tabs
java
package com.example.demo.service;

import io.github.resilience4j.circuitbreaker.annotation.CircuitBreaker;
import io.github.resilience4j.ratelimiter.annotation.RateLimiter;
import io.github.resilience4j.retry.annotation.Retry;
import io.github.resilience4j.bulkhead.annotation.Bulkhead;

Resilience with Resilience4j

java resilience4j circuit-breaker
by David Kumar 2 tabs
java
package com.example.demo.aspect;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.slf4j.Logger;

Aspect-Oriented Programming with AspectJ

java aop aspectj
by David Kumar 3 tabs
java
package com.example.demo.multitenancy;

public class TenantContext {
    private static final ThreadLocal<String> CURRENT_TENANT = new ThreadLocal<>();

    public static void setTenantId(String tenantId) {

Multi-tenancy for SaaS applications

java multi-tenancy saas
by David Kumar 4 tabs
java
package com.example.demo.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.context.annotation.Bean;

Event-driven architecture with Spring Events

java spring-events event-driven
by David Kumar 4 tabs
java
package com.example.demo.model;

import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
import org.springframework.data.elasticsearch.annotations.FieldType;

Elasticsearch integration for full-text search

java elasticsearch spring-data
by David Kumar 3 tabs
java
package com.example.demo.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;

WebSocket for real-time communication

java websocket spring-boot
by David Kumar 3 tabs
java
package com.example.demo.batch;

import com.example.demo.model.User;
import com.example.demo.model.UserDTO;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;

Batch processing with Spring Batch

java spring-batch batch-processing
by David Kumar 2 tabs
graphql
type User {
    id: ID!
    name: String!
    email: String!
    posts: [Post!]!
    createdAt: String!

GraphQL API with Spring Boot

java graphql spring-boot
by David Kumar 3 tabs
java
package com.example.demo.feature;

import org.togglz.core.Feature;
import org.togglz.core.annotation.EnabledByDefault;
import org.togglz.core.annotation.Label;
import org.togglz.core.context.FeatureContext;

Feature flags for gradual rollouts

java feature-flags togglz
by David Kumar 4 tabs
java
package com.example.demo.dto;

import java.time.LocalDateTime;
import java.util.List;

// Simple record

Record types for immutable data

java records immutable
by David Kumar 2 tabs
sql
CREATE TABLE users (
    id BIGSERIAL PRIMARY KEY,
    username VARCHAR(100) NOT NULL UNIQUE,
    email VARCHAR(255) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,

Database migration with Flyway

java flyway database-migration
by David Kumar 6 tabs