The Aggregator Microservice Pattern is a design pattern used to compose a complex service by aggregating the responses of multiple independent microservices. This pattern is proper when a client request requires data or functionality distributed across multiple microservices. It can improve the performance and scalability of the system by allowing each microservice to focus on a specific task and reducing the workload of a single microservice. In this article, we will discuss how the Aggregator Microservice Pattern can be implemented in Java using various approaches, such as asynchronous communication, synchronous communication, or a combination of both. We will also provide examples of code to illustrate each approach.
Aggregator Microservice Pattern In Java With Examples
Asynchronous Communication
public class AsyncAggregatorMicroservice {
private final ExecutorService executorService;
private final Microservice1Client microservice1Client;
private final Microservice2Client microservice2Client;
private final Microservice3Client microservice3Client;
public AsyncAggregatorMicroservice(ExecutorService executorService, Microservice1Client microservice1Client, Microservice2Client microservice2Client, Microservice3Client microservice3Client) {
this.executorService = executorService;
this.microservice1Client = microservice1Client;
this.microservice2Client = microservice2Client;
this.microservice3Client = microservice3Client;
}
public CompletableFuture<AggregatedResponse> processRequest(Request request) {
CompletableFuture<Response1> response1Future = CompletableFuture.supplyAsync(() -> microservice1Client.processRequest(request), executorService);
CompletableFuture<Response2> response2Future = CompletableFuture.supplyAsync(() -> microservice2Client.processRequest(request), executorService);
CompletableFuture<Response3> response3Future = CompletableFuture.supplyAsync(() -> microservice3Client.processRequest(request), executorService);
return CompletableFuture.allOf(response1Future, response2Future, response3Future)
.thenApply(v -> new AggregatedResponse(response1Future.join(), response2Future.join(), response3Future.join()));
}
}
Synchronous Communication
public class SyncAggregatorMicroservice {
private final Microservice1Client microservice1Client;
private final Microservice2Client microservice2Client;
private final Microservice3Client microservice3Client;
public SyncAggregatorMicroservice(Microservice1Client microservice1Client,
Microservice2Client microservice2Client,
Microservice3Client microservice3Client) {
this.microservice1Client = microservice1Client;
this.microservice2Client = microservice2Client;
this.microservice3Client = microservice3Client;
}
public AggregatedResponse processRequest(Request request) {
Response1 response1 = microservice1Client.processRequest(request);
Response2 response2 = microservice2Client.processRequest(request);
Response3 response3 = microservice3Client.processRequest(request);
return new AggregatedResponse(response1, response2, response3);
}
}
Combination of Asynchronous and Synchronous Communication
public class HybridAggregatorMicroservice {
private final ExecutorService executorService;
private final Microservice1Client microservice1Client;
private final Microservice2Client microservice2Client;
private final Microservice3Client microservice3Client;
public HybridAggregatorMicroservice(ExecutorService executorService, Microservice1Client microservice1Client, Microservice2Client microservice2Client, Microservice3Client microservice3Client) {
this.executorService = executorService;
this.microservice1Client = microservice1Client;
this.microservice2Client = microservice2Client;
this.microservice3Client = microservice3Client;
}
public AggregatedResponse processRequest(Request request) {
CompletableFuture<Response1> response1Future = CompletableFuture.supplyAsync(() -> microservice1Client.processRequest(request), executorService);
Response2 response2 = microservice2Client.processRequest(request);
CompletableFuture<Response3> response3Future = CompletableFuture.supplyAsync(() -> microservice3Client.processRequest(request), executorService);
return CompletableFuture.allOf(response1Future, response3Future)
.thenApply(v -> new AggregatedResponse(response1Future.join(), response2, response3Future.join()));
}
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