org.apache.openjpa.jdbc.kernel
Class PessimisticLockManager

java.lang.Object
  org.apache.openjpa.kernel.AbstractLockManager
      org.apache.openjpa.kernel.VersionLockManager
          org.apache.openjpa.jdbc.kernel.PessimisticLockManager

All Implemented Interfaces:

JDBCLockManager, LockLevels, LockManager, Closeable

public class PessimisticLockManager
extends VersionLockManager
implements JDBCLockManager

Lock manager that uses exclusive database locks.

Author:

Marc Prud'hommeaux

Field Summary

static int

LOCK_DATASTORE_ONLY

Fields inherited from class org.apache.openjpa.kernel.AbstractLockManager

ctx, log

Fields inherited from interface org.apache.openjpa.kernel.LockLevels

LOCK_NONE, LOCK_READ, LOCK_WRITE

Constructor Summary

PessimisticLockManager()

Method Summary

protected void	checkLock(ResultSet rs, OpenJPAStateManager sm) This method is to provide override for non-JDBC or JDBC-like implementation of checking lock from the result set.
protected ResultSet	executeQuery(Connection conn, PreparedStatement stmnt, SQLBuffer sql) This method is to provide override for non-JDBC or JDBC-like implementation of executing query.
JDBCStore	getStore()
void	loadedForUpdate(OpenJPAStateManager sm) Notification that the given instance was loaded via a result set produced by a FOR UPDATE select.
protected void	lockInternal(OpenJPAStateManager sm, int level, int timeout, Object sdata) Marks the instance's transactional status in accordance with the settings of VersionLockManager.getVersionCheckOnReadLock() and VersionLockManager.getVersionUpdateOnWriteLock().
protected PreparedStatement	prepareStatement(Connection conn, SQLBuffer sql) This method is to provide override for non-JDBC or JDBC-like implementation of preparing statement.
boolean	selectForUpdate(Select sel, int lockLevel) Return whether to issue the given select FOR UPDATE, depending on the capabilities of the dictionary and the fetch configuration.
void	setContext(StoreContext ctx) Set the context this lock manager is associated with.
protected void	setTimeout(PreparedStatement stmnt, int timeout) This method is to provide override for non-JDBC or JDBC-like implementation of setting query timeout.

Methods inherited from class org.apache.openjpa.kernel.VersionLockManager

getLockLevel, getVersionCheckOnReadLock, getVersionUpdateOnWriteLock, lock, release, setLockLevel, setVersionCheckOnReadLock, setVersionUpdateOnWriteLock

Methods inherited from class org.apache.openjpa.kernel.AbstractLockManager

beginTransaction, close, endTransaction, getContext, lockAll

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.openjpa.kernel.LockManager

beginTransaction, close, endTransaction, getLockLevel, lock, lockAll, release

Field Detail

LOCK_DATASTORE_ONLY

public static final int LOCK_DATASTORE_ONLY

See Also:

Constant Field Values

Constructor Detail

PessimisticLockManager

public PessimisticLockManager()

Method Detail

setContext

public void setContext(StoreContext ctx)

Description copied from interface: LockManager

Set the context this lock manager is associated with. This will be invoked in the lock manager before any other methods are called.

Specified by:

setContext in interface LockManager

Overrides:

setContext in class AbstractLockManager

selectForUpdate

public boolean selectForUpdate(Select sel,
                               int lockLevel)

Description copied from interface: JDBCLockManager

Return whether to issue the given select FOR UPDATE, depending on the capabilities of the dictionary and the fetch configuration.

Specified by:

selectForUpdate in interface JDBCLockManager

loadedForUpdate

public void loadedForUpdate(OpenJPAStateManager sm)

Description copied from interface: JDBCLockManager

Notification that the given instance was loaded via a result set produced by a FOR UPDATE select.

Specified by:

loadedForUpdate in interface JDBCLockManager

lockInternal

protected void lockInternal(OpenJPAStateManager sm,
                            int level,
                            int timeout,
                            Object sdata)

Description copied from class: VersionLockManager

Marks the instance's transactional status in accordance with the settings of VersionLockManager.getVersionCheckOnReadLock() and VersionLockManager.getVersionUpdateOnWriteLock(). Override to perform additional locking.

Overrides:

lockInternal in class VersionLockManager

See Also:

StoreContext.transactional(java.lang.Object, boolean, org.apache.openjpa.kernel.OpCallbacks)

getStore

public JDBCStore getStore()

prepareStatement

protected PreparedStatement prepareStatement(Connection conn,
                                             SQLBuffer sql)
                                      throws SQLException

This method is to provide override for non-JDBC or JDBC-like implementation of preparing statement.

Throws:

SQLException

setTimeout

protected void setTimeout(PreparedStatement stmnt,
                          int timeout)
                   throws SQLException

This method is to provide override for non-JDBC or JDBC-like implementation of setting query timeout.

Throws:

SQLException

executeQuery

protected ResultSet executeQuery(Connection conn,
                                 PreparedStatement stmnt,
                                 SQLBuffer sql)
                          throws SQLException

This method is to provide override for non-JDBC or JDBC-like implementation of executing query.

Throws:

SQLException

checkLock

protected void checkLock(ResultSet rs,
                         OpenJPAStateManager sm)
                  throws SQLException

This method is to provide override for non-JDBC or JDBC-like implementation of checking lock from the result set.

Throws:

SQLException