我正在使用Spring 2.x,Spring Data REST,Hibernate 5.x,Mysql创建服务器REST应用。
我按照以下准则配置了多租户:https://dzone.com/articles/spring-boot-hibernate-multitenancy-implementation,唯一的不同是我为每个租户使用了数据库。
我有一个MultiTenantConnectionProvider
用于创建与数据库的连接,另外还有一个TenantIdentifierResolver
用于获取当前租户。
一些相关的代码段:
@Component
public class TenantIdentifierResolver implements CurrentTenantIdentifierResolver {
@Override
public String resolveCurrentTenantIdentifier() {
String tenantId = TenantContext.getCurrentTenant();
if (tenantId != null) {
return tenantId;
}
return DEFAULT_TENANT_ID;
}
@Override
public boolean validateExistingCurrentSessions() {
return true;
}
}
...
@Component
@Profile("prod")
public class MultiTenantConnectionProviderImpl implements MultiTenantConnectionProvider {
private static final long serialVersionUID = 3193007611085791247L;
private Logger log = LogManager.getLogger();
private Map<String, HikariDataSource> dataSourceMap = new ConcurrentHashMap<String, HikariDataSource>();
@Autowired
private TenantRestClient tenantRestClient;
@Autowired
private PasswordEncrypt passwordEncrypt;
@Override
public void releaseAnyConnection(Connection connection) throws SQLException {
connection.close();
}
@Override
public Connection getAnyConnection() throws SQLException {
Connection connection = getDataSource(TenantIdResolver.TENANT_DEFAULT).getConnection();
return connection;
}
@Override
public Connection getConnection(String tenantId) throws SQLException {
Connection connection = getDataSource(tenantId).getConnection();
return connection;
}
@Override
public void releaseConnection(String tenantId, Connection connection) throws SQLException {
log.info("releaseConnection " + tenantId);
connection.close();
}
@Override
public boolean supportsAggressiveRelease() {
return false;
}
@Override
public boolean isUnwrappableAs(Class unwrapType) {
return false;
}
@Override
public <T> T unwrap(Class<T> unwrapType) {
return null;
}
public HikariDataSource getDataSource(@NotNull String tentantId) throws SQLException {
if (dataSourceMap.containsKey(tentantId)) {
return dataSourceMap.get(tentantId);
} else {
HikariDataSource dataSource = createDataSource(tentantId);
dataSourceMap.put(tentantId, dataSource);
return dataSource;
}
}
public HikariDataSource createDataSource(String tenantId) throws SQLException {
log.info("Create Datasource for tenant {}", tenantId);
try {
Database database = tenantRestClient.getDatabase(tenantId);
DatabaseInstance databaseInstance = tenantRestClient.getDatabaseInstance(tenantId);
if (database != null && databaseInstance != null) {
HikariConfig hikari = new HikariConfig();
String driver = "";
String options = "";
switch (databaseInstance.getType()) {
case MYSQL:
driver = "jdbc:mysql://";
options = "?useLegacyDatetimeCode=false&serverTimezone=UTC&useUnicode=yes&characterEncoding=UTF-8&useSSL=false";
break;
default:
driver = "jdbc:mysql://";
options = "?useLegacyDatetimeCode=false&serverTimezone=UTC&useUnicode=yes&characterEncoding=UTF-8&useSSL=false";
}
hikari.setJdbcUrl(driver + databaseInstance.getHost() + ":" + databaseInstance.getPort() + "/" + database.getName() + options);
hikari.setUsername(database.getUsername());
hikari.setPassword(passwordEncrypt.decryptPassword(database.getPassword()));
// MySQL optimizations, see
// https://github.com/brettwooldridge/HikariCP/wiki/MySQL-Configuration
hikari.addDataSourceProperty("cachePrepStmts", true);
hikari.addDataSourceProperty("prepStmtCacheSize", "250");
hikari.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
hikari.addDataSourceProperty("useServerPrepStmts", "true");
hikari.addDataSourceProperty("useLocalSessionState", "true");
hikari.addDataSourceProperty("useLocalTransactionState", "true");
hikari.addDataSourceProperty("rewriteBatchedStatements", "true");
hikari.addDataSourceProperty("cacheResultSetMetadata", "true");
hikari.addDataSourceProperty("cacheServerConfiguration", "true");
hikari.addDataSourceProperty("elideSetAutoCommits", "true");
hikari.addDataSourceProperty("maintainTimeStats", "false");
hikari.setMinimumIdle(3);
hikari.setMaximumPoolSize(5);
hikari.setIdleTimeout(30000);
hikari.setPoolName("JPAHikari_" + tenantId);
// mysql wait_timeout 600seconds
hikari.setMaxLifetime(580000);
hikari.setLeakDetectionThreshold(60 * 1000);
HikariDataSource dataSource = new HikariDataSource(hikari);
return dataSource;
} else {
throw new SQLException(String.format("DB not found for tenant %s!", tenantId));
}
} catch (Exception e) {
throw new SQLException(e.getMessage());
}
}
}
我还以这种方式配置了Hibernate:
@Configuration
@Profile("prod")
public class HibernateConfig {
@Autowired
private JpaProperties jpaProperties;
@Bean
public JpaVendorAdapter jpaVendorAdapter() {
return new HibernateJpaVendorAdapter();
}
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource,
MultiTenantConnectionProvider multiTenantConnectionProviderImpl,
CurrentTenantIdentifierResolver currentTenantIdentifierResolverImpl) {
Map<String, Object> properties = new HashMap<>();
properties.putAll(jpaProperties.getHibernateProperties(new HibernateSettings()));
properties.put(Environment.MULTI_TENANT, MultiTenancyStrategy.DATABASE);
properties.put(Environment.MULTI_TENANT_CONNECTION_PROVIDER, multiTenantConnectionProviderImpl);
properties.put(Environment.MULTI_TENANT_IDENTIFIER_RESOLVER, currentTenantIdentifierResolverImpl);
LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
em.setDataSource(dataSource);
em.setPackagesToScan("com.server");
em.setJpaVendorAdapter(jpaVendorAdapter());
em.setJpaPropertyMap(properties);
return em;
}
}
这是我的application.properties:
spring.datasource.url=jdbc:mysql://url:3306/empty?useLegacyDatetimeCode=false&serverTimezone=UTC&useSSL=false
spring.datasource.username=empty
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.password=empty
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL57Dialect
spring.jpa.hibernate.ddl-auto: validate
spring.jpa.hibernate.naming.physical- strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
spring.jpa.show-sql: false
在应用程序启动期间,我看到Spring创建了到我在属性文件中配置的数据库的连接池。
我想避免这种情况,因为我的所有连接都是由MultiTenantConnectionProviderImpl
创建的。
我想继续将EntityManager
和Datasource
注入豆中。
我已经看到了如何禁用Spring Boot数据源配置here,但是这样做之后,我不再能够在应用程序中注入数据源。
您是否建议如何从属性文件中完全删除数据源的定义,然后以编程方式从MultiTenantConnectionProviderImpl
将数据源注入应用程序中?
答案 0 :(得分:1)
以下是有关如何以编程方式创建数据源的完整示例。
仅从属性文件获取参数,而不是在Java类内部进行硬编码。
当您定义多个数据源时,您必须定义一个<int:object-to-string-transformer id="transformer" input-channel="replies" output-channel="response" />
而仅定义一个,那么您将有一个@Primary
,可以标识每个数据源。如何管理它们应该很简单。
@Qualifier