JAVA springcloud b2b2c多使用者商城系統原始碼（二十三）非同步方法

happywawa發表於2019-03-20
JavaSpringGCCloud原始碼非同步

建立工程

在pom檔案引入相關依賴：

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<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>

　　建立一個接收資料的實體：

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@JsonIgnoreProperties(ignoreUnknown=true)
public class User {
private String name;
private String blog;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getBlog() {
return blog;
}
public void setBlog(String blog) {
this.blog = blog;
}
@Override
public String toString() {
return "User [name=" + name + ", blog=" + blog + "]";
}
}

　　建立一個請求的　githib的service:

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@Service
public class GitHubLookupService {
private static final Logger logger = LoggerFactory.getLogger(GitHubLookupService.class);
private final RestTemplate restTemplate;
public GitHubLookupService(RestTemplateBuilder restTemplateBuilder) {
this.restTemplate = restTemplateBuilder.build();
}
@Async
public Future<User> findUser(String user) throws InterruptedException {
logger.info("Looking up " + user);
String url = String.format("https://api.github.com/users/%s", user);
User results = restTemplate.getForObject(url, User.class);
// Artificial delay of 1s for demonstration purposes
Thread.sleep(1000L);
return new AsyncResult<>(results);
}
}

　　

通過，RestTemplate去請求，另外加上類@Async 表明是一個非同步任務。

開啟非同步任務：

複製程式碼
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@SpringBootApplication
@EnableAsync
public class Application extends AsyncConfigurerSupport {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@Override
public Executor getAsyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(2);
executor.setMaxPoolSize(2);
executor.setQueueCapacity(500);
executor.setThreadNamePrefix("GithubLookup-");
executor.initialize();
return executor;
}
}

　　

通過@EnableAsync開啟非同步任務；並且配置AsyncConfigurerSupport，比如最大的執行緒池為2.

測試

測試程式碼如下：

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@Component
public class AppRunner implements CommandLineRunner {
private static final Logger logger = LoggerFactory.getLogger(AppRunner.class);
private final GitHubLookupService gitHubLookupService;
public AppRunner(GitHubLookupService gitHubLookupService) {
this.gitHubLookupService = gitHubLookupService;
}
@Override
public void run(String... args) throws Exception {
// Start the clock
long start = System.currentTimeMillis();
// Kick of multiple, asynchronous lookups
Future<User> page1 = gitHubLookupService.findUser("PivotalSoftware");
Future<User> page2 = gitHubLookupService.findUser("CloudFoundry");
Future<User> page3 = gitHubLookupService.findUser("Spring-Projects");
// Wait until they are all done
while (!(page1.isDone() && page2.isDone() && page3.isDone())) {
Thread.sleep(10); //10-millisecond pause between each check
}
// Print results, including elapsed time
logger.info("Elapsed time: " + (System.currentTimeMillis() - start));
logger.info("--> " + page1.get());
logger.info("--> " + page2.get());
logger.info("--> " + page3.get());
}
}

　　啟動程式，控制檯會列印：

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2017-04-30 13:11:10.351 INFO 1511 — [ GithubLookup-1] com.forezp.service.GitHubLookupService : Looking up PivotalSoftware
2017-04-30 13:11:10.351 INFO 1511 — [ GithubLookup-2] com.forezp.service.GitHubLookupService : Looking up CloudFoundry
2017-04-30 13:11:13.144 INFO 1511 — [ GithubLookup-2] com.forezp.service.GitHubLookupService : Looking up Spring-Projects

　　架構程式碼如下:

"分散式b2b <wbr


Spring Cloud大型企業分散式微服務雲構建的B2B2C電子商務平臺原始碼請加企鵝求求：一零三八七七四六二六 

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