https://github.com/rohitpshelar/java-communication-technologies

Java Communication Technologies
https://github.com/rohitpshelar/java-communication-technologies

activemq graphql grpc java-25 kafka mqtt rabbitmq rest-api soap-web-services spring-boot webhook webrtc websocket

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Java Communication Technologies

• Host: GitHub
• URL: https://github.com/rohitpshelar/java-communication-technologies
• Owner: rohitpshelar
• Created: 2025-09-30T13:59:00.000Z (3 months ago)
• Default Branch: main
• Last Pushed: 2025-09-30T15:57:50.000Z (3 months ago)
• Last Synced: 2025-09-30T16:29:35.694Z (3 months ago)
• Topics: activemq, graphql, grpc, java-25, kafka, mqtt, rabbitmq, rest-api, soap-web-services, spring-boot, webhook, webrtc, websocket
• Language: Java
• Homepage:
• Size: 63.5 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          


# Communication Technologies Comparison

## High-Level Summary Table

| Technology | Primary Purpose | Communication Pattern | Best For |

| :--- | :--- | :--- | :--- |

| **Webhook** | Event Notification | Asynchronous, Push (HTTP POST) | Simple, one-way event notifications (e.g., "payment completed"). |

| **REST API** | Resource Management | Synchronous, Request/Response | Stateless CRUD operations, public-facing APIs, mobile apps. |

| **SOAP API** | Structured Service Calls | Synchronous, Request/Response | Enterprise-grade, secure, transactional services (e.g., banking). |

| **gRPC** | High-Performance Services | Synchronous/Async, Request/Response | Microservices, internal systems, low-latency, streaming. |

| **WebSocket** | Full-Duplex Communication | Asynchronous, Persistent Connection | Real-time, interactive apps (e.g., chat, live feeds, games). |

| **WebRTC** | Peer-to-Peer Data/Media | Asynchronous, Peer-to-Peer | Browser-based video/audio calls, file sharing, low-latency data. |

| **ActiveMQ / RabbitMQ** | Message Queuing | Asynchronous, Message Broker | Decoupling services, reliable delivery, task distribution. |

| **Kafka** | Event Streaming Platform | Asynchronous, Log-Based Streaming | High-throughput event streams, data pipelines, activity tracking. |

| **MQTT** | Publish-Subscribe Model | Asynchronous | Decoupling services, Fire-and-Forget, pub/sub., synchronous cryptography to enable secure asynchronous messaging |

| **GraphQL** | Flexible API Querying | Synchronous, Request/Response | APIs where clients need to request specific data, avoiding over-fetching and under-fetching |

## Detailed Explanations

Let's group them into categories for better understanding.

### Category 1: Request/Reply APIs (Synchronous)

These are used when a client sends a request and waits for a specific response from the server.

#### REST API (Representational State Transfer)

- **What it is:** An architectural style for designing networked applications. It uses standard HTTP methods (GET, POST, PUT, DELETE) and typically uses JSON for data format.

- **Key Differentiator:** Stateless, lightweight, and uses a uniform interface. It's the dominant style for public-facing web APIs.

- **Analogy:** Ordering from a menu at a restaurant. You give your order (request) and wait for your food (response).

#### SOAP API (Simple Object Access Protocol)

- **What it is:** A strict protocol for exchanging structured information using XML. It comes with built-in security (WS-Security), transactions, and ACID compliance.

- **Key Differentiator:** Highly standardized, secure, and heavy-weight. Often used in legacy enterprise systems (e.g., banking, healthcare).

- **Analogy:** Sending a formal, certified letter with a strict format and a return receipt.

#### gRPC (Google Remote Procedure Call)

- **What it is:** A modern, high-performance RPC framework. It uses HTTP/2 for transport and Protocol Buffers (a binary, efficient data format) by default.

- **Key Differentiator:** Very fast and efficient. Supports bi-directional streaming (not just simple request/response). Ideal for internal communication between microservices.

- **Analogy:** A highly efficient, specialized courier service for internal company mail that can also handle continuous data feeds.

#### GraphQL - Query Language & API Layer

### Category 2: Asynchronous & Event-Driven Messaging

These are used to decouple systems, where the sender doesn't wait for the receiver to process the message.

#### Webhook

- **What it is:** A simple, user-defined HTTP callback. When an event occurs in System A, it sends an HTTP POST request to a URL (the webhook) you provided in System B.

- **Key Differentiator:** Extremely simple way to get event notifications over HTTP. It's a "push" model from the server to your client.

- **Analogy:** Giving your phone number to a package delivery service so they can text you "your package has been delivered."

#### ActiveMQ & RabbitMQ (Message Brokers / Queues)

- **What they are:** Message brokers that implement the AMQP or JMS protocol. They receive messages from producers and route them to consumers.

- **Key Differentiator:** They are excellent for **task distribution** and **decoupling**. They guarantee that a message is delivered *at least once* and is processed by *one consumer*. If a consumer is down, the message waits in the queue.

- **Analogy:** A post office with a queue for letters. Each letter is processed by one postal worker, and if a worker is sick, the letters wait in line.

#### Kafka (Event Streaming Platform)

- **What it is:** A distributed, durable, high-throughput event streaming platform. It treats data as an immutable log of events.

- **Key Differentiator:** Designed for **streaming massive volumes of data**. Multiple consumers can read from the same stream of events without removing them (pub/sub). Events are stored durably.

- **Analogy:** A broadcast television channel. The broadcast is sent out (the event stream), and any number of TVs (consumers) can tune in to watch it, both now and later (replay).

### Category 3: Real-Time & Peer-to-Peer Communication

#### WebSocket

- **What it is:** A protocol providing full-duplex, persistent communication channels over a single TCP connection.

- **Key Differentiator:** After an initial HTTP "handshake," the connection stays open, allowing the server and client to send messages to each other at any time with very low overhead.

- **Analogy:** A telephone call. Once the connection is established, both parties can talk and listen simultaneously without hanging up and redialing.

#### WebRTC (Web Real-Time Communication)

- **What it is:** A collection of standards and APIs that enables direct, peer-to-peer communication for audio, video, and data between browsers (or other clients).

- **Key Differentiator:** **Peer-to-peer** is the key. It's designed for ultra-low-latency media streaming. While a server (signaling server) is needed to initiate the connection, the actual data flow is direct between peers.

- **Analogy:** A walkie-talkie conversation. You use a base station (signaling server) to find the other person's frequency, but then you talk directly to each other.