Package org.springframework.jdbc.datasource

Class IsolationLevelDataSourceAdapter

java.lang.Object
org.springframework.jdbc.datasource.DelegatingDataSource
org.springframework.jdbc.datasource.UserCredentialsDataSourceAdapter
org.springframework.jdbc.datasource.IsolationLevelDataSourceAdapter
All Implemented Interfaces:
Wrapper, CommonDataSource, DataSource, org.springframework.beans.factory.InitializingBean
public class IsolationLevelDataSourceAdapter extends UserCredentialsDataSourceAdapter
An adapter for a target DataSource, applying the current Spring transaction's isolation level (and potentially specified user credentials) to every getConnection call. Also applies the read-only flag, if specified.

Can be used to proxy a target JNDI DataSource that does not have the desired isolation level (and user credentials) configured. Client code can work with this DataSource as usual, not worrying about such settings.

Inherits the capability to apply specific user credentials from its superclass UserCredentialsDataSourceAdapter; see the latter's javadoc for details on that functionality (e.g. UserCredentialsDataSourceAdapter.setCredentialsForCurrentThread(java.lang.String, java.lang.String)).

WARNING: This adapter simply calls Connection.setTransactionIsolation(int) and/or Connection.setReadOnly(boolean) for every Connection obtained from it. It does, however, not reset those settings; it rather expects the target DataSource to perform such resetting as part of its connection pool handling. Make sure that the target DataSource properly cleans up such transaction state.

Since:
2.0.3
Author:
Juergen Hoeller
See Also:

  • Constructor Details

    • IsolationLevelDataSourceAdapter

      public IsolationLevelDataSourceAdapter()

  • Method Details

    • setIsolationLevelName

      public final void setIsolationLevelName(String constantName) throws IllegalArgumentException
      Set the default isolation level by the name of the corresponding constant in TransactionDefinition, e.g. "ISOLATION_SERIALIZABLE".

      If not specified, the target DataSource's default will be used. Note that a transaction-specific isolation value will always override any isolation setting specified at the DataSource level.

      Parameters:
      constantName - name of the constant
      Throws:
      IllegalArgumentException
      See Also:
      • TransactionDefinition.ISOLATION_READ_UNCOMMITTED
      • TransactionDefinition.ISOLATION_READ_COMMITTED
      • TransactionDefinition.ISOLATION_REPEATABLE_READ
      • TransactionDefinition.ISOLATION_SERIALIZABLE
      • setIsolationLevel(int)

    • setIsolationLevel

      public void setIsolationLevel(int isolationLevel)
      Specify the default isolation level to use for Connection retrieval, according to the JDBC Connection constants (equivalent to the corresponding Spring TransactionDefinition constants).

      If not specified, the target DataSource's default will be used. Note that a transaction-specific isolation value will always override any isolation setting specified at the DataSource level.

      See Also:

    • getIsolationLevel

      @Nullable protected Integer getIsolationLevel()
      Return the statically specified isolation level, or null if none.

    • doGetConnection

      protected Connection doGetConnection(@Nullable String username, @Nullable String password) throws SQLException
      Applies the current isolation level value and read-only flag to the returned Connection.
      Overrides:
      doGetConnection in class UserCredentialsDataSourceAdapter
      Parameters:
      username - the username to use
      password - the password to use
      Returns:
      the Connection
      Throws:
      SQLException
      See Also:

    • getCurrentIsolationLevel

      @Nullable protected Integer getCurrentIsolationLevel()
      Determine the current isolation level: either the transaction's isolation level or a statically defined isolation level.
      Returns:
      the current isolation level, or null if none
      See Also:

    • getCurrentReadOnlyFlag

      @Nullable protected Boolean getCurrentReadOnlyFlag()
      Determine the current read-only flag: by default, the transaction's read-only hint.
      Returns:
      whether there is a read-only hint for the current scope
      See Also:
      • TransactionSynchronizationManager.isCurrentTransactionReadOnly()