Micronaut FunctionInitializer重写应用程序属性

Question

@Singleton
public class TestFunction extends FunctionInitializer {
Logger log = LoggerFactory.getLogger(TestFunction.class);
public TestFunction() {
}
public String execute() {
return "Hello";
}
}

我想以编程方式覆盖application.yml文件中的数据源属性，但不使用bean创建的事件侦听器。有办法做到这一点吗。类似于创建具有属性的自定义应用程序上下文。

我对Micronaut API网关代理使用了以下方法。

public class StreamLambdaHandler implements RequestStreamHandler {
.......
public StreamLambdaHandler() {
try {
log.info("Initializing Lambda Container");
this.dbCredentialService = new DBCredentialService();
// Get updated database credential map
Map<String, Object> props = this.dbCredentialService.getDbCredential();
// Create application context builder with updated properties
// i.e Override datasources properties in application.yml
builder = ApplicationContext.build().properties(props);
handler = new MicronautLambdaContainerHandler(builder);
}....
........
}

我们可以用FunctionInitializer做类似的事情吗？

Answer 1

如果您计划只覆盖数据源凭据属性，可以这样做。

@Factory
public class HikariDataSourceFactory {
@Bean
@Primary
public DataSource dataSource(DBCredentialService credentialService) throws URISyntaxException {
Map<String, Object> credentials = this.dbCredentialService.getDbCredential();
String username = "user";
String password = credentials.get("username");  

HikariConfig config = new HikariConfig();
config.setJdbcUrl("jdbc:postgresql://localhost:5432/postgres");
config.setUsername(username);
config.setPassword(password);
config.setDriverClassName("org.postgresql.Driver");
return new HikariUrlDataSource(config);
}
}