我能够使用 mangodb 在 Spring Reactive 应用程序中实现多租户。负责实现的主要类有:自定义的MongoDbFactory类、用于捕获租户信息的WebFilter类(而不是Servlet Filter)和用于存储租户信息的ThreadLocal类。流程非常简单:
- 从 WebFilter 中的请求中捕获租户相关信息并将其设置在 ThreadLocal 中。在这里,我使用标头发送租户信息:X-Tenant
- 实现自定义 MondoDbFactory 类并覆盖
getMongoDatabase()
方法根据 ThreadLocal 类中可用的当前租户返回数据库。
源代码是:
CurrentTenantHolder.java
package com.jazasoft.demo;
public class CurrentTenantHolder {
private static final ThreadLocal<String> currentTenant = new InheritableThreadLocal<>();
public static String get() {
return currentTenant.get();
}
public static void set(String tenant) {
currentTenant.set(tenant);
}
public static String remove() {
synchronized (currentTenant) {
String tenant = currentTenant.get();
currentTenant.remove();
return tenant;
}
}
}
TenantContextWebFilter.java
package com.example.demo;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
import reactor.core.publisher.Mono;
@Component
public class TenantContextWebFilter implements WebFilter {
public static final String TENANT_HTTP_HEADER = "X-Tenant";
@Override
public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
ServerHttpRequest request = exchange.getRequest();
if (request.getHeaders().containsKey(TENANT_HTTP_HEADER)) {
String tenant = request.getHeaders().getFirst(TENANT_HTTP_HEADER);
CurrentTenantHolder.set(tenant);
}
return chain.filter(exchange).doOnSuccessOrError((Void v, Throwable throwable) -> CurrentTenantHolder.remove());
}
}
多租户MongoDbFactory.java
package com.example.demo;
import com.mongodb.reactivestreams.client.MongoClient;
import com.mongodb.reactivestreams.client.MongoDatabase;
import org.springframework.dao.DataAccessException;
import org.springframework.data.mongodb.core.SimpleReactiveMongoDatabaseFactory;
public class MultiTenantMongoDbFactory extends SimpleReactiveMongoDatabaseFactory {
private final String defaultDatabase;
public MultiTenantMongoDbFactory(MongoClient mongoClient, String databaseName) {
super(mongoClient, databaseName);
this.defaultDatabase = databaseName;
}
@Override
public MongoDatabase getMongoDatabase() throws DataAccessException {
final String tlName = CurrentTenantHolder.get();
final String dbToUse = (tlName != null ? tlName : this.defaultDatabase);
return super.getMongoDatabase(dbToUse);
}
}
MongoDbConfig.java
package com.example.demo;
import com.mongodb.reactivestreams.client.MongoClient;
import com.mongodb.reactivestreams.client.MongoClients;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.core.ReactiveMongoClientFactoryBean;
import org.springframework.data.mongodb.core.ReactiveMongoTemplate;
@Configuration
public class MongoDbConfig {
@Bean
public ReactiveMongoTemplate reactiveMongoTemplate(MultiTenantMongoDbFactory multiTenantMongoDbFactory) {
return new ReactiveMongoTemplate(multiTenantMongoDbFactory);
}
@Bean
public MultiTenantMongoDbFactory multiTenantMangoDbFactory(MongoClient mongoClient) {
return new MultiTenantMongoDbFactory(mongoClient, "test1");
}
@Bean
public ReactiveMongoClientFactoryBean mongoClient() {
ReactiveMongoClientFactoryBean clientFactory = new ReactiveMongoClientFactoryBean();
clientFactory.setHost("localhost");
return clientFactory;
}
}
UPDATE:
在反应流中,我们无法再将上下文信息存储在 ThreadLocal 中,因为请求不绑定到单个线程,因此,这不是正确的解决方案。
然而,上下文信息可以像这样存储在WebFilter中的reactor Context中。chain.filter(exchange).subscriberContext(context -> context.put("tenant", tenant));
。问题是如何获取这些上下文信息ReactiveMongoDatabaseFactory
实现类。