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Inter-Service Communication

RestTemplate vs WebClient

Blocking vs Reactive HTTP Clients
💡 RestTemplate, EK, "TRADITIONAL, PHONE, CALL" jaisa, hai — CALL, karте, ho, aur, RESPONSE, ka, WAIT, karte, ho (BLOCKING). WebClient, EK, "TEXT, MESSAGE" jaisa, hai — BHEJKE, apna, KAAM, KARTE, RAHTE, ho, RESPONSE, AANE, PAR, NOTIFICATION, milti, hai (NON-BLOCKING).

RestTemplate, EK, BLOCKING, HTTP, client, hai — Spring, ISE, MAINTENANCE, MODE, mein, DAAL, chuka, hai — NAYE, PROJECTS, mein, USE, karna, DISCOURAGE, kiya, jaata hai.

WebClient, MODERN, REACTIVE, HTTP, client, hai — Spring WebFlux, ka, HISSA, hai — NON-BLOCKING, calls, ke, liye, USE, hota hai, HIGH-THROUGHPUT, scenarios, mein, BETTER, RESOURCE, utilization, ke, saath.

// WebClient (modern, recommended):
WebClient client = WebClient.create("http://inventory-service");
Mono<InventoryDto> inv = client.get()
    .uri("/api/inventory/{id}", productId)
    .retrieve()
    .bodyToMono(InventoryDto.class);
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RestTemplate, EK, "TRADITIONAL, PHONE, CALL" jaisa, hai — CALL, karте, ho, aur, RESPONSE, ka, WAIT, karte, ho (BLOCKING). WebClient, EK, "TEXT, MESSAGE" jaisa, hai — BHEJKE, apna, KAAM, KARTE, RAHTE, ho, RESPONSE, AANE, PAR, NOTIFICATION, milti, hai (NON-BLOCKING).
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⚡ Quick Recap
  • RestTemplate = blocking client — Spring, ne, ise, MAINTENANCE, mode, mein, DAAL, diya, hai
  • WebClient = reactive, non-blocking client — MODERN, recommended, choice
  • WebClient, blocking, applications, mein, bhi, .block(), se, USE, ho, sakta, hai
Is page mein (2 subtopics)

WebClient, ke, non-blocking, model, mein, EK, thread, EK, HTTP, call, ka, response, ka, WAIT, KARТE, waqt, "BLOCK" nahi, hota — WOH, thread, dusre, kaam, kar, sakta hai — HIGH-CONCURRENCY, scenarios, mein, KAAFI, FEWER, threads, se, MORE, requests, handle, ho, sakte, hain.

webClient.get().uri(url).retrieve().bodyToMono(Dto.class)
    .subscribe(result -> processResult(result));   // non-blocking

Simple, low-traffic, internal, tools, ke, liye, blocking, code, (RestTemplate, ya, WebClient.block()) ki, SIMPLICITY, aksar, WORTH, hoti, hai — reactive, programming, ki, complexity, HAR, use-case, ke, liye, ZAROORI, nahi, hoti.