org.apache.calcite.adapter.jdbc

Class JdbcUtils.DataSourcePool

java.lang.Object

org.apache.calcite.adapter.jdbc.JdbcUtils.DataSourcePool

Enclosing class:

JdbcUtils

static class JdbcUtils.DataSourcePool
extends Object

Ensures that if two data sources have the same definition, they will use the same object.

This in turn makes it easier to cache SqlDialect objects. Otherwise, each time we see a new data source, we have to open a connection to find out what database product and version it is.

Field Summary

Fields

Modifier and Type	Field and Description
private com.google.common.cache.LoadingCache<List<String>,org.apache.commons.dbcp.BasicDataSource>	cache
static JdbcUtils.DataSourcePool	INSTANCE

Constructor Summary

Constructors

Constructor and Description
DataSourcePool()

Method Summary

Modifier and Type	Method and Description
DataSource	get(String url, String driverClassName, String username, String password)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INSTANCE

public static final JdbcUtils.DataSourcePool INSTANCE

cache

private final com.google.common.cache.LoadingCache<List<String>,org.apache.commons.dbcp.BasicDataSource> cache

Constructor Detail

DataSourcePool

DataSourcePool()

Method Detail

get

public DataSource get(String url,
                      String driverClassName,
                      String username,
                      String password)