[英]How to use C3P0 in a spring boot hibernate multi tenant application to manage connection pool?
我正在嘗試使用休眠的MultiTenantConnectionProvider和CurrentTenantIdentifierResolver實現多租戶應用程序。 我不確定休眠狀態如何管理池,將其留給休眠狀態是否是一個好習慣。 我可以在此多租戶應用程序中使用C3P0嗎?
這是我的初始代碼:
@Bean(name = "dataSources" )
public Map<String, DataSource> dataSources() {
Map<String, DataSource> result = new HashMap<>();
for (DataSourceProperties dsProperties : this.multiTenantProperties.getDataSources()) {
DataSourceBuilder factory = DataSourceBuilder
.create()
.url(dsProperties.getUrl())
.username(dsProperties.getUsername())
.password(dsProperties.getPassword())
.driverClassName(dsProperties.getDriverClassName());
result.put(dsProperties.getTenantId(), factory.build());
}
return result;
}
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean(MultiTenantConnectionProvider DataSourceMultiTenantConnectionProviderImpl ,
CurrentTenantIdentifierResolver currentTenantIdentifierResolver) {
Map<String, Object> hibernateProps = new LinkedHashMap<>();
hibernateProps.putAll(this.jpaProperties.getProperties());
hibernateProps.put(Environment.MULTI_TENANT, MultiTenancyStrategy.DATABASE);
hibernateProps.put(Environment.MULTI_TENANT_CONNECTION_PROVIDER, multiTenantConnectionProvider);
hibernateProps.put(Environment.MULTI_TENANT_IDENTIFIER_RESOLVER, TenantIdentifierResolverImpl );
// No dataSource is set to resulting entityManagerFactoryBean
LocalContainerEntityManagerFactoryBean result = new LocalContainerEntityManagerFactoryBean();
result.setPackagesToScan(new String[] { Test.class.getPackage().getName() });
result.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
result.setJpaPropertyMap(hibernateProps);
return result;
}
這是在休眠狀態下配置的連接提供程序
public class DataSourceMultiTenantConnectionProviderImpl extends
AbstractDataSourceBasedMultiTenantConnectionProviderImpl {
private static final long serialVersionUID = 1L;
@Autowired
private Map<String, DataSource> dataSources;
@Override
protected DataSource selectAnyDataSource() {
return this.dataSources.values().iterator().next();
}
@Override
protected DataSource selectDataSource(String tenantIdentifier) {
return this.dataSources.get(tenantIdentifier);
}
}
這是提供給休眠的租戶解析器
public class TenantIdentifierResolverImpl implements
CurrentTenantIdentifierResolver {
private static String DEFAULT_TENANT_ID = "tenant_1";
@Override
public String resolveCurrentTenantIdentifier() {
String currentTenantId = TenantContext.getTenantId();
return (currentTenantId != null) ? currentTenantId : DEFAULT_TENANT_ID;
}
@Override
public boolean validateExistingCurrentSessions() {
return true;
}
}
如何在這里處理連接池?
您可能需要將數據源bean更改為此:
@Bean(name = "dataSources" )
public Map<String, ComboPooledDataSource> dataSources() throws PropertyVetoException {
Map<String, ComboPooledDataSource> result = new HashMap<>();
for (DataSourceProperties dsProperties : this.multiTenantProperties.getDataSources()) {
ComboPooledDataSource ds = new ComboPooledDataSource();
ds.setDriverClass(dsProperties.getDriverClassName());
ds.setJdbcUrl(dsProperties.getUrl());
ds.setUser(dsProperties.getUsername());
ds.setPassword(dsProperties.getPassword());
ds.setInitialPoolSize(5);
ds.setMinPoolSize(1);
ds.setAcquireIncrement(1);
ds.setMaxPoolSize(5);
result.put(dsProperties.getTenantId(), ds);
}
return result;
}
並將此方法添加到您的DataSourceMultiTenantConnectionProviderImpl
@Override
public Connection getConnection(String tenantIdentifier) throws SQLException {
return this.dataSources.get(tenantIdentifier).getConnection();
}
這足以使用C3P0啟動連接池。
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