Package org.apache.derby.impl.store.raw.xact

Class RowLocking3

    • Constructor Detail

      • RowLocking3

        protected RowLocking3​(LockFactory lf)

    • Method Detail

      • getReadLockType

        protected RowLock getReadLockType()
        Get type of lock to get while reading data.

        This routine is provided so that class's like RowLockingRR can override just this routine to get RS2 locks vs RS3 locks, and still reuse all the other code in this class.

        Returns:
        The lock type of a shared lock for this locking policy.

      • getUpdateLockType

        protected RowLock getUpdateLockType()
        Get type of lock to get while requesting "update" lock.

        This routine is provided so that class's like RowLockingRR can override just this routine to get RU2 locks vs RU3 locks, and still reuse all the other code in this class.

        Returns:
        The lock type of a shared lock for this locking policy.

      • getWriteLockType

        protected RowLock getWriteLockType()
        Get type of lock to get while writing data.

        This routine is provided so that class's like RowLockingRR can override just this routine to get RX2 locks vs RX3 locks, and still reuse all the other code in this class.

        Returns:
        The lock type of a shared lock for this locking policy.

      • lockContainer

        public boolean lockContainer​(Transaction t,
                             ContainerHandle container,
                             boolean waitForLock,
                             boolean forUpdate)
                      throws StandardException
        Obtain container level intent lock.

        This implementation of row locking is 2 level, ie. table and row locking. It will interact correctly with tables opened with ContainerLocking3 locking mode.

        Updater's will get table level IX locks, and X row locks.

        Reader's will get table level IS locks, and S row locks.

        Specified by:
        lockContainer in interface LockingPolicy
        Overrides:
        lockContainer in class NoLocking
        Parameters:
        t - Transaction to associate lock with.
        container - Container to lock.
        waitForLock - Should lock request wait until granted?
        forUpdate - Should container be locked for update, or read?
        Returns:
        true if the lock was obtained, false if it wasn't. False should only be returned if the waitForLock policy was set to "false," and the lock was unavailable.
        Throws:
        StandardException - Standard exception policy.
        See Also:
        ContainerHandle

      • lockRecordForRead

        public boolean lockRecordForRead​(Transaction t,
                                 ContainerHandle container_handle,
                                 RecordHandle record,
                                 boolean waitForLock,
                                 boolean forUpdate)
                          throws StandardException
        Obtain lock on record being read.

        Assumes that a table level IS has been acquired. Will acquire a Shared or Update lock on the row, depending on the "forUpdate" parameter.

        Specified by:
        lockRecordForRead in interface LockingPolicy
        Overrides:
        lockRecordForRead in class NoLocking
        Parameters:
        t - The transaction to associate the lock with.
        record - The record to be locked.
        waitForLock - Should lock request wait until granted?
        forUpdate - Whether to open for read or write access.
        container_handle - Open Container used to get record. Will be used to row locks by the container they belong to.
        Returns:
        true if the lock was granted, false if waitForLock was false and the lock could not be granted.
        Throws:
        StandardException - Standard exception policy.
        See Also:
        Page

      • zeroDurationLockRecordForWrite

        public boolean zeroDurationLockRecordForWrite​(Transaction t,
                                              RecordHandle record,
                                              boolean lockForInsertPreviousKey,
                                              boolean waitForLock)
                                       throws StandardException
        Obtain lock on record being written.

        Assumes that a table level IX has been acquired. Will acquire an Exclusive (X) lock on the row.

        Specified by:
        zeroDurationLockRecordForWrite in interface LockingPolicy
        Overrides:
        zeroDurationLockRecordForWrite in class NoLocking
        Parameters:
        t - transaction to associate the lock with.
        record - The record to be locked.
        lockForInsertPreviousKey - Lock is for a previous key of a insert.
        waitForLock - Should lock request wait until granted?
        Returns:
        true if the lock was granted, false if waitForLock was false and the lock could not be granted.
        Throws:
        StandardException - Standard exception policy.
        See Also:
        Page

      • lockRecordForWrite

        public boolean lockRecordForWrite​(Transaction t,
                                  RecordHandle record,
                                  boolean lockForInsert,
                                  boolean waitForLock)
                           throws StandardException
        Obtain lock on record being written.

        Assumes that a table level IX has been acquired. Will acquire an Exclusive (X) lock on the row.

        Specified by:
        lockRecordForWrite in interface LockingPolicy
        Overrides:
        lockRecordForWrite in class NoLocking
        Parameters:
        t - The transaction to associate the lock with.
        record - The record to be locked.
        lockForInsert - Lock is for an insert.
        waitForLock - Should lock request wait until granted?
        Returns:
        true if the lock was granted, false if waitForLock was false and the lock could not be granted.
        Throws:
        StandardException - Standard exception policy.
        See Also:
        Page