{"id":3380,"date":"2025-12-24T10:01:11","date_gmt":"2025-12-24T15:01:11","guid":{"rendered":"https:\/\/www.mymiller.name\/wordpress\/?p=3380"},"modified":"2025-12-24T10:01:11","modified_gmt":"2025-12-24T15:01:11","slug":"synchronous-to-asynchronous","status":"publish","type":"post","link":"https:\/\/www.mymiller.name\/wordpress\/java\/synchronous-to-asynchronous\/","title":{"rendered":"Synchronous to Asynchronous"},"content":{"rendered":"\n

Converting a synchronous method to an asynchronous one in Java involves modifying the code to allow other tasks to execute while it is waiting for input\/output operations to complete. Here’s an example of how to convert a synchronous method to an asynchronous one in Java:<\/p>\n\n\n\n

Let’s say we have a synchronous method that performs a CPU-intensive operation:<\/p>\n\n\n\n

public int calculate(int x, int y) {\n    int result = 0;\n    for (int i = 0; i < x; i++) {\n        for (int j = 0; j < y; j++) {\n            result += i * j;\n        }\n    }\n    return result;\n}\n<\/code><\/pre>\n\n\n\n
To convert this to an asynchronous method, we can make use of the CompletableFuture<\/code> class in Java. First, we need to change the return type from int<\/code> to CompletableFuture<Integer><\/code>. We also need to mark the method with the Async<\/code> annotation:<\/p>\n\n\n\n
import java.util.concurrent.CompletableFuture;\nimport java.util.concurrent.ExecutorService;\nimport java.util.concurrent.Executors;\n\nimport org.springframework.scheduling.annotation.Async;\nimport org.springframework.stereotype.Service;\n\n@Service\npublic class CalculationService {\n\n    private ExecutorService executor = Executors.newFixedThreadPool(10);\n\n    @Async\n    public CompletableFuture<Integer> calculateAsync(int x, int y) {\n        CompletableFuture<Integer> completableFuture = new CompletableFuture<>();\n        executor.submit(() -> {\n            int result = 0;\n            for (int i = 0; i < x; i++) {\n                for (int j = 0; j < y; j++) {\n                    result += i * j;\n                }\n            }\n            completableFuture.complete(result);\n        });\n        return completableFuture;\n    }\n}\n\n<\/code><\/pre>\n\n\n\n
In this example, we have used the @Async<\/code> annotation provided by Spring Framework to mark the method as asynchronous. We have also created a CompletableFuture<\/code> object to hold the result of the calculation. The calculation is performed inside a separate thread using an ExecutorService<\/code>, and the result is set in the CompletableFuture<\/code> object when it becomes available.<\/p>\n\n\n\n
By returning a CompletableFuture<\/code> object, other tasks can continue executing while the calculation is being performed in the background. The caller can then use the get()<\/code> method on the CompletableFuture<\/code> object to wait for the result of the calculation.<\/p>\n","protected":false},"excerpt":{"rendered":"
Converting a synchronous method to an asynchronous one in Java involves modifying the code to allow other tasks to execute while it is waiting for input\/output operations to complete. Here’s an example of how to convert a synchronous method to an asynchronous one in Java: Let’s say we have a synchronous method that performs a […]<\/p>\n","protected":false},"author":1,"featured_media":3382,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[280],"tags":[],"series":[],"class_list":["post-3380","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.mymiller.name\/wordpress\/wp-content\/uploads\/2023\/06\/multitasking-ga6749a2b2_640.jpg?fit=640%2C394&ssl=1","jetpack-related-posts":[{"id":3576,"url":"https:\/\/www.mymiller.name\/wordpress\/springboot\/asynchronous-vs-synchronous-logging-in-spring-boot-a-deep-dive-with-examples-and-lombok-configuration\/","url_meta":{"origin":3380,"position":0},"title":"Asynchronous vs. Synchronous Logging in Spring Boot: A Deep Dive with Examples and Lombok Configuration","author":"Jeffery Miller","date":"April 20, 2026","format":false,"excerpt":"Logging is essential for application monitoring and debugging, and Spring Boot offers both asynchronous and synchronous logging options. Let\u2019s explore these approaches, demonstrate their usage with examples, and streamline configuration using Lombok. 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