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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.jdbc.datasource.lookup 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource
   org.springframework.jdbc.datasource.lookup.IsolationLevelDataSourceRouter

IsolationLevelDataSourceRouter
public class IsolationLevelDataSourceRouter extends AbstractRoutingDataSource (Code)
DataSource that routes to one of various target DataSources based on the current transaction isolation level. The target DataSources need to be configured with the isolation level name as key, as defined on the org.springframework.transaction.TransactionDefinition TransactionDefinition interface .

This is particularly useful in combination with JTA transaction management (typically through Spring's org.springframework.transaction.jta.JtaTransactionManager ). Standard JTA does not support transaction-specific isolation levels. Some JTA providers support isolation levels as a vendor-specific extension (e.g. WebLogic), which is the preferred way of addressing this. As alternative (e.g. on WebSphere), the target database can be represented through multiple JNDI DataSources, each configured with a different isolation level (for the entire DataSource). The present DataSource router allows to transparently switch to the appropriate DataSource based on the current transaction's isolation level.

The configuration can for example look like this, assuming that the target DataSources are defined as individual Spring beans with names "myRepeatableReadDataSource", "mySerializableDataSource" and "myDefaultDataSource":

 <bean id="dataSourceRouter" class="org.springframework.jdbc.datasource.lookup.IsolationLevelDataSourceRouter">
 <property name="targetDataSources">
 <map>
 <entry key="ISOLATION_REPEATABLE_READ" value-ref="myRepeatableReadDataSource"/>
 <entry key="ISOLATION_SERIALIZABLE" value-ref="mySerializableDataSource"/>
 </map>
 </property>
 <property name="defaultTargetDataSource" ref="myDefaultDataSource"/>
 </bean>
Alternatively, the keyed values can also be data source names, to be resolved through a IsolationLevelDataSourceRouter.setDataSourceLookup DataSourceLookup : by default, JNDI names for a standard JNDI lookup. This allows for a single concise definition without the need for separate DataSource bean definitions.
 <bean id="dataSourceRouter" class="org.springframework.jdbc.datasource.lookup.IsolationLevelDataSourceRouter">
 <property name="targetDataSources">
 <map>
 <entry key="ISOLATION_REPEATABLE_READ" value="java:comp/env/jdbc/myrrds"/>
 <entry key="ISOLATION_SERIALIZABLE" value="java:comp/env/jdbc/myserds"/>
 </map>
 </property>
 <property name="defaultTargetDataSource" value="java:comp/env/jdbc/mydefds"/>
 </bean>
Note: If you are using this router in combination with Spring's org.springframework.transaction.jta.JtaTransactionManager , don't forget to switch the "allowCustomIsolationLevels" flag to "true". (By default, JtaTransactionManager will only accept a default isolation level because of the lack of isolation level support in standard JTA itself.)
 <bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
 <property name="allowCustomIsolationLevels" value="true"/>
 </bean>

author:
   Juergen Hoeller
since:
   2.0.1
See Also:   IsolationLevelDataSourceRouter.setTargetDataSources
See Also:   IsolationLevelDataSourceRouter.setDefaultTargetDataSource
See Also:   org.springframework.transaction.TransactionDefinition.ISOLATION_READ_UNCOMMITTED
See Also:   org.springframework.transaction.TransactionDefinition.ISOLATION_READ_COMMITTED
See Also:   org.springframework.transaction.TransactionDefinition.ISOLATION_REPEATABLE_READ
See Also:   org.springframework.transaction.TransactionDefinition.ISOLATION_SERIALIZABLE
See Also:   org.springframework.transaction.jta.JtaTransactionManager




Method Summary
protected  ObjectdetermineCurrentLookupKey()
    
protected  ObjectresolveSpecifiedLookupKey(Object lookupKey)
     Supports Integer values for the isolation level constants as well as isolation level names as defined on the org.springframework.transaction.TransactionDefinition TransactionDefinition interface .



Method Detail
determineCurrentLookupKey
protected Object determineCurrentLookupKey()(Code)



resolveSpecifiedLookupKey
protected Object resolveSpecifiedLookupKey(Object lookupKey)(Code)
Supports Integer values for the isolation level constants as well as isolation level names as defined on the org.springframework.transaction.TransactionDefinition TransactionDefinition interface .



Methods inherited from org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource
public void afterPropertiesSet()(Code)(Java Doc)
abstract protected Object determineCurrentLookupKey()(Code)(Java Doc)
protected DataSource determineTargetDataSource()(Code)(Java Doc)
public Connection getConnection() throws SQLException(Code)(Java Doc)
public Connection getConnection(String username, String password) throws SQLException(Code)(Java Doc)
protected DataSource resolveSpecifiedDataSource(Object dataSource) throws IllegalArgumentException(Code)(Java Doc)
protected Object resolveSpecifiedLookupKey(Object lookupKey)(Code)(Java Doc)
public void setDataSourceLookup(DataSourceLookup dataSourceLookup)(Code)(Java Doc)
public void setDefaultTargetDataSource(Object defaultTargetDataSource)(Code)(Java Doc)
public void setTargetDataSources(Map targetDataSources)(Code)(Java Doc)

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