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AbstractRoutingDataSource (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.jdbc.datasource.lookup
Class AbstractRoutingDataSource

java.lang.Object
  org.springframework.jdbc.datasource.AbstractDataSource
      org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource

All Implemented Interfaces:

Wrapper, CommonDataSource, DataSource, InitializingBean

Direct Known Subclasses:

IsolationLevelDataSourceRouter

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public abstract class AbstractRoutingDataSource
extends AbstractDataSource
implements InitializingBean

Abstract DataSource implementation that routes getConnection() calls to one of various target DataSources based on a lookup key. The latter is usually (but not necessarily) determined through some thread-bound transaction context.

Since:

2.0.1

Author:

Juergen Hoeller

See Also:

setTargetDataSources(java.util.Map), setDefaultTargetDataSource(java.lang.Object), determineCurrentLookupKey()

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Field Summary

 

Fields inherited from class org.springframework.jdbc.datasource.AbstractDataSource
logger

 

Constructor Summary
AbstractRoutingDataSource()

 

Method Summary
void	afterPropertiesSet()           Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
protected abstract  Object	determineCurrentLookupKey()           Determine the current lookup key.
protected  DataSource	determineTargetDataSource()           Retrieve the current target DataSource.
Connection	getConnection()
Connection	getConnection(String username, String password)
protected  DataSource	resolveSpecifiedDataSource(Object dataSource)           Resolve the specified data source object into a DataSource instance.
protected  Object	resolveSpecifiedLookupKey(Object lookupKey)           Resolve the given lookup key object, as specified in the targetDataSources map, into the actual lookup key to be used for matching with the current lookup key.
void	setDataSourceLookup(DataSourceLookup dataSourceLookup)           Set the DataSourceLookup implementation to use for resolving data source name Strings in the targetDataSources map.
void	setDefaultTargetDataSource(Object defaultTargetDataSource)           Specify the default target DataSource, if any.
void	setTargetDataSources(Map targetDataSources)           Specify the map of target DataSources, with the lookup key as key.

 

Methods inherited from class org.springframework.jdbc.datasource.AbstractDataSource
getLoginTimeout, getLogWriter, isWrapperFor, setLoginTimeout, setLogWriter, unwrap

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

AbstractRoutingDataSource

public AbstractRoutingDataSource()

Method Detail

setTargetDataSources

public void setTargetDataSources(Map targetDataSources)

Specify the map of target DataSources, with the lookup key as key. The mapped value can either be a corresponding DataSource instance or a data source name String (to be resolved via a DataSourceLookup.

The key can be of arbitrary type; this class implements the generic lookup process only. The concrete key representation will be handled by resolveSpecifiedLookupKey(Object) and determineCurrentLookupKey().

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setDefaultTargetDataSource

public void setDefaultTargetDataSource(Object defaultTargetDataSource)

Specify the default target DataSource, if any. The mapped value can either be a corresponding DataSource instance or a data source name String (to be resolved via a DataSourceLookup.

This DataSource will be used as target if none of the keyed targetDataSources match the determineCurrentLookupKey() current lookup key}.

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setDataSourceLookup

public void setDataSourceLookup(DataSourceLookup dataSourceLookup)

Set the DataSourceLookup implementation to use for resolving data source name Strings in the targetDataSources map.

Default is a JndiDataSourceLookup, allowing the JNDI names of application server DataSources to be specified directly.

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afterPropertiesSet

public void afterPropertiesSet()

Description copied from interface: InitializingBean

Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

Specified by:

afterPropertiesSet in interface InitializingBean

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resolveSpecifiedDataSource

protected DataSource resolveSpecifiedDataSource(Object dataSource)
                                         throws IllegalArgumentException

Resolve the specified data source object into a DataSource instance.

The default implementation handles DataSource instances and data source names (to be resolved via a DataSourceLookup).

Parameters:

dataSource - the data source value object as specified in the targetDataSources map

Returns:

the resolved DataSource (never null)

Throws:

IllegalArgumentException - in case of an unsupported value type

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getConnection

public Connection getConnection()
                         throws SQLException

Specified by:

getConnection in interface DataSource

Throws:

SQLException

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getConnection

public Connection getConnection(String username,
                                String password)
                         throws SQLException

Specified by:

getConnection in interface DataSource

Throws:

SQLException

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determineTargetDataSource

protected DataSource determineTargetDataSource()

Retrieve the current target DataSource. Determines the current lookup key, performs a lookup in the targetDataSources map, falls back to the specified default target DataSource if necessary.

See Also:

determineCurrentLookupKey()

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resolveSpecifiedLookupKey

protected Object resolveSpecifiedLookupKey(Object lookupKey)

Resolve the given lookup key object, as specified in the targetDataSources map, into the actual lookup key to be used for matching with the current lookup key.

The default implementation simply returns the given key as-is.

Parameters:

lookupKey - the lookup key object as specified by the user

Returns:

the lookup key as needed for matching

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determineCurrentLookupKey

protected abstract Object determineCurrentLookupKey()

Determine the current lookup key. This will typically be implemented to check a thread-bound transaction context.

Allows for arbitrary keys. The returned key needs to match the stored lookup key type, as resolved by the resolveSpecifiedLookupKey(java.lang.Object) method.

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