Package org.apache.tomcat.dbcp.dbcp2.cpdsadapter

Class DriverAdapterCPDS

java.lang.Object
org.apache.tomcat.dbcp.dbcp2.cpdsadapter.DriverAdapterCPDS
All Implemented Interfaces:
Serializable, Referenceable, ObjectFactory, CommonDataSource, ConnectionPoolDataSource
public class DriverAdapterCPDS extends Object implements ConnectionPoolDataSource, Referenceable, Serializable, ObjectFactory

An adapter for JDBC drivers that do not include an implementation of ConnectionPoolDataSource, but still include a DriverManager implementation. ConnectionPoolDataSources are not used within general applications. They are used by DataSource implementations that pool Connections, such as SharedPoolDataSource. A J2EE container will normally provide some method of initializing the ConnectionPoolDataSource whose attributes are presented as bean getters/setters and then deploying it via JNDI. It is then available as a source of physical connections to the database, when the pooling DataSource needs to create a new physical connection.

Although normally used within a JNDI environment, the DriverAdapterCPDS can be instantiated and initialized as any bean and then attached directly to a pooling DataSource. Jdbc2PoolDataSource can use the ConnectionPoolDataSource with or without the use of JNDI.

The DriverAdapterCPDS also provides PreparedStatement pooling which is not generally available in jdbc2 ConnectionPoolDataSource implementation, but is addressed within the jdbc3 specification. The PreparedStatement pool in DriverAdapterCPDS has been in the dbcp package for some time, but it has not undergone extensive testing in the configuration used here. It should be considered experimental and can be toggled with the poolPreparedStatements attribute.

The package documentation contains an example using catalina and JNDI. The datasources package documentation shows how to use DriverAdapterCPDS as a source for Jdbc2PoolDataSource without the use of JNDI.

Since:
2.0
See Also:

  • Constructor Details

    • DriverAdapterCPDS

      public DriverAdapterCPDS()
      Default no-arg constructor for Serialization

  • Method Details

    • getConnectionProperties

      public Properties getConnectionProperties()
      Gets the connection properties passed to the JDBC driver.
      Returns:
      the JDBC connection properties used when creating connections.

    • getDescription

      public String getDescription()
      Gets the value of description. This property is here for use by the code which will deploy this datasource. It is not used internally.
      Returns:
      value of description, may be null.
      See Also:

    • getDriver

      public String getDriver()
      Gets the driver class name.
      Returns:
      value of driver.

    • getLoginTimeout

      public int getLoginTimeout()
      Gets the maximum time in seconds that this data source can wait while attempting to connect to a database. NOT USED.
      Specified by:
      getLoginTimeout in interface CommonDataSource
      Specified by:
      getLoginTimeout in interface ConnectionPoolDataSource

    • getLogWriter

      public PrintWriter getLogWriter()
      Gets the log writer for this data source. NOT USED.
      Specified by:
      getLogWriter in interface CommonDataSource
      Specified by:
      getLogWriter in interface ConnectionPoolDataSource

    • getMaxIdle

      public int getMaxIdle()
      Gets the maximum number of statements that can remain idle in the pool, without extra ones being released, or negative for no limit.
      Returns:
      the value of maxIdle

    • getMaxPreparedStatements

      public int getMaxPreparedStatements()
      Gets the maximum number of prepared statements.
      Returns:
      maxPrepartedStatements value

    • getMinEvictableIdleTimeMillis

      public int getMinEvictableIdleTimeMillis()
      Gets the minimum amount of time a statement may sit idle in the pool before it is eligible for eviction by the idle object evictor (if any).
      Returns:
      the minimum amount of time a statement may sit idle in the pool.
      See Also:

    • getNumTestsPerEvictionRun

      public int getNumTestsPerEvictionRun()
      Gets the number of statements to examine during each run of the idle object evictor thread (if any.)
      Returns:
      the number of statements to examine during each run of the idle object evictor thread (if any.)
      See Also:

    • getObjectInstance

      public Object getObjectInstance(Object refObj, Name name, Context context, Hashtable<?,?> env) throws Exception
      Implements ObjectFactory to create an instance of this class
      Specified by:
      getObjectInstance in interface ObjectFactory
      Throws:
      Exception

    • getParentLogger

      public Logger getParentLogger() throws SQLFeatureNotSupportedException
      Specified by:
      getParentLogger in interface CommonDataSource
      Throws:
      SQLFeatureNotSupportedException

    • getPassword

      public String getPassword()
      Gets the value of password for the default user.
      Returns:
      value of password.

    • getPasswordCharArray

      public char[] getPasswordCharArray()
      Gets the value of password for the default user.
      Returns:
      value of password.
      Since:
      2.4.0

    • getPooledConnection

      public PooledConnection getPooledConnection() throws SQLException
      Attempts to establish a database connection using the default user and password.
      Specified by:
      getPooledConnection in interface ConnectionPoolDataSource
      Throws:
      SQLException

    • getPooledConnection

      public PooledConnection getPooledConnection(String pooledUserName, String pooledUserPassword) throws SQLException
      Attempts to establish a database connection.
      Specified by:
      getPooledConnection in interface ConnectionPoolDataSource
      Parameters:
      pooledUserName - name to be used for the connection
      pooledUserPassword - password to be used fur the connection
      Throws:
      SQLException

    • getReference

      public Reference getReference() throws NamingException
      Implements Referenceable.
      Specified by:
      getReference in interface Referenceable
      Throws:
      NamingException

    • getTimeBetweenEvictionRunsMillis

      public long getTimeBetweenEvictionRunsMillis()
      Gets the number of milliseconds to sleep between runs of the idle object evictor thread. When non-positive, no idle object evictor thread will be run.
      Returns:
      the value of the evictor thread timer
      See Also:

    • getUrl

      public String getUrl()
      Gets the value of url used to locate the database for this datasource.
      Returns:
      value of url.

    • getUser

      public String getUser()
      Gets the value of default user (login or user name).
      Returns:
      value of user.

    • isAccessToUnderlyingConnectionAllowed

      public boolean isAccessToUnderlyingConnectionAllowed()
      Returns the value of the accessToUnderlyingConnectionAllowed property.
      Returns:
      true if access to the underlying is allowed, false otherwise.

    • isPoolPreparedStatements

      public boolean isPoolPreparedStatements()
      Whether to toggle the pooling of PreparedStatements
      Returns:
      value of poolPreparedStatements.

    • setAccessToUnderlyingConnectionAllowed

      public void setAccessToUnderlyingConnectionAllowed(boolean allow)
      Sets the value of the accessToUnderlyingConnectionAllowed property. It controls if the PoolGuard allows access to the underlying connection. (Default: false)
      Parameters:
      allow - Access to the underlying connection is granted when true.

    • setConnectionProperties

      public void setConnectionProperties(Properties props)
      Sets the connection properties passed to the JDBC driver.

      If props contains "user" and/or "password" properties, the corresponding instance properties are set. If these properties are not present, they are filled in using getUser(), getPassword() when getPooledConnection() is called, or using the actual parameters to the method call when getPooledConnection(String, String) is called. Calls to setUser(String) or setPassword(String) overwrite the values of these properties if connectionProperties is not null.

      Parameters:
      props - Connection properties to use when creating new connections.
      Throws:
      IllegalStateException - if getPooledConnection() has been called

    • setDescription

      public void setDescription(String description)
      Sets the value of description. This property is here for use by the code which will deploy this datasource. It is not used internally.
      Parameters:
      description - Value to assign to description.

    • setDriver

      public void setDriver(String driver) throws ClassNotFoundException
      Sets the driver class name. Setting the driver class name cause the driver to be registered with the DriverManager.
      Parameters:
      driver - Value to assign to driver.
      Throws:
      IllegalStateException - if getPooledConnection() has been called
      ClassNotFoundException - if the class cannot be located

    • setLoginTimeout

      public void setLoginTimeout(int seconds)
      Sets the maximum time in seconds that this data source will wait while attempting to connect to a database. NOT USED.
      Specified by:
      setLoginTimeout in interface CommonDataSource
      Specified by:
      setLoginTimeout in interface ConnectionPoolDataSource

    • setLogWriter

      public void setLogWriter(PrintWriter logWriter)
      Sets the log writer for this data source. NOT USED.
      Specified by:
      setLogWriter in interface CommonDataSource
      Specified by:
      setLogWriter in interface ConnectionPoolDataSource

    • setMaxIdle

      public void setMaxIdle(int maxIdle)
      Gets the maximum number of statements that can remain idle in the pool, without extra ones being released, or negative for no limit.
      Parameters:
      maxIdle - The maximum number of statements that can remain idle
      Throws:
      IllegalStateException - if getPooledConnection() has been called

    • setMaxPreparedStatements

      public void setMaxPreparedStatements(int maxPreparedStatements)
      Sets the maximum number of prepared statements.
      Parameters:
      maxPreparedStatements - the new maximum number of prepared statements

    • setMinEvictableIdleTimeMillis

      public void setMinEvictableIdleTimeMillis(int minEvictableIdleTimeMillis)
      Sets the minimum amount of time a statement may sit idle in the pool before it is eligible for eviction by the idle object evictor (if any). When non-positive, no objects will be evicted from the pool due to idle time alone.
      Parameters:
      minEvictableIdleTimeMillis - minimum time to set (in ms)
      Throws:
      IllegalStateException - if getPooledConnection() has been called
      See Also:

    • setNumTestsPerEvictionRun

      public void setNumTestsPerEvictionRun(int numTestsPerEvictionRun)
      Sets the number of statements to examine during each run of the idle object evictor thread (if any).

      When a negative value is supplied, ceil(BasicDataSource.getNumIdle())/abs(getNumTestsPerEvictionRun()) tests will be run. I.e., when the value is -n, roughly one nth of the idle objects will be tested per run.

      Parameters:
      numTestsPerEvictionRun - number of statements to examine per run
      Throws:
      IllegalStateException - if getPooledConnection() has been called
      See Also:

    • setPassword

      public void setPassword(char[] userPassword)
      Sets the value of password for the default user.
      Parameters:
      userPassword - Value to assign to password.
      Throws:
      IllegalStateException - if getPooledConnection() has been called

    • setPassword

      public void setPassword(String userPassword)
      Sets the value of password for the default user.
      Parameters:
      userPassword - Value to assign to password.
      Throws:
      IllegalStateException - if getPooledConnection() has been called

    • setPoolPreparedStatements

      public void setPoolPreparedStatements(boolean poolPreparedStatements)
      Whether to toggle the pooling of PreparedStatements
      Parameters:
      poolPreparedStatements - true to pool statements.
      Throws:
      IllegalStateException - if getPooledConnection() has been called

    • setTimeBetweenEvictionRunsMillis

      public void setTimeBetweenEvictionRunsMillis(long timeBetweenEvictionRunsMillis)
      Sets the number of milliseconds to sleep between runs of the idle object evictor thread. When non-positive, no idle object evictor thread will be run.
      Parameters:
      timeBetweenEvictionRunsMillis - The number of milliseconds to sleep between runs of the idle object evictor thread. When non-positive, no idle object evictor thread will be run.
      Throws:
      IllegalStateException - if getPooledConnection() has been called
      See Also:

    • setUrl

      public void setUrl(String url)
      Sets the value of URL string used to locate the database for this datasource.
      Parameters:
      url - Value to assign to url.
      Throws:
      IllegalStateException - if getPooledConnection() has been called

    • setUser

      public void setUser(String userName)
      Sets the value of default user (login or user name).
      Parameters:
      userName - Value to assign to user.
      Throws:
      IllegalStateException - if getPooledConnection() has been called

    • toString

      public String toString()
      Does not print the userName and userPassword field nor the 'user' or 'password' in the connectionProperties.
      Overrides:
      toString in class Object
      Since:
      2.6.0