Examples with ConglomerateController org.apache.derby.iapi.store.access.ConglomerateController used on opensource projects

Example 71 with ConglomerateController

use of org.apache.derby.iapi.store.access.ConglomerateController in project derby by apache.

the class BTreeController method start_xact_and_dosplit.

/**
 * Start an internal transaction and do the split.
 * <p>
 * This routine starts a new transaction, and handles any errors that
 * may come during the transaction.  This transation must not obtain any
 * locks as they are likely to conflict with the current user transaction.
 * <p>
 * If attempt_to_reclaim_deleted_rows is true this routine will
 * attempt to reclaim space on the leaf page input, by purging
 * committed deleted rows from the leaf.  If it succeeds in purging at
 * least one row, then it will commit the internal transaction and return
 * without actually performing a split.
 *
 * @param scratch_template  A scratch template used to search a page.
 * @param rowToInsert       The row to insert, make sure during split to
 *                          make room for this row.
 *
 * @exception  StandardException  Standard exception policy.
 */
private long start_xact_and_dosplit(boolean attempt_to_reclaim_deleted_rows, long leaf_pageno, DataValueDescriptor[] scratch_template, DataValueDescriptor[] rowToInsert, int flag) throws StandardException {
    TransactionManager split_xact = null;
    OpenBTree split_open_btree = null;
    ControlRow root = null;
    // Get an internal transaction to be used for the split.
    split_xact = this.init_open_user_scans.getInternalTransaction();
    if (SanityManager.DEBUG) {
        if (((getOpenMode() & ContainerHandle.MODE_FORUPDATE) != ContainerHandle.MODE_FORUPDATE)) {
            SanityManager.THROWASSERT("Container not opened with update should not cause split");
        }
    }
    boolean do_split = true;
    if (attempt_to_reclaim_deleted_rows) {
        // Get lock on base table.
        ConglomerateController base_cc = null;
        try {
            base_cc = this.getConglomerate().lockTable(split_xact, (ContainerHandle.MODE_FORUPDATE | ContainerHandle.MODE_LOCK_NOWAIT), TransactionController.MODE_RECORD, TransactionController.ISOLATION_REPEATABLE_READ);
        } catch (StandardException se) {
        // any error just don't try to reclaim deleted rows.  The
        // expected error is that we can't get the lock, which the
        // current interface throws as a containerNotFound exception.
        }
        if (base_cc != null) {
            // we got IX lock on the base table, so can try reclaim space.
            // We can only reclaim space by opening the btree in row lock
            // mode.  Table level lock row recovery is hard as we can't
            // determine if the deleted rows we encounter have been
            // deleted by our parent caller and have been committed or
            // not.  We will have to get those rows offline.
            split_open_btree = new OpenBTree();
            split_open_btree.init(this.init_open_user_scans, split_xact, // open the container.
            null, split_xact.getRawStoreXact(), false, (ContainerHandle.MODE_FORUPDATE | ContainerHandle.MODE_LOCK_NOWAIT), TransactionManager.MODE_RECORD, this.getConglomerate().getBtreeLockingPolicy(split_xact.getRawStoreXact(), TransactionController.MODE_RECORD, LockingPolicy.MODE_RECORD, TransactionController.ISOLATION_REPEATABLE_READ, (ConglomerateController) base_cc, split_open_btree), this.getConglomerate(), (LogicalUndo) null, (DynamicCompiledOpenConglomInfo) null);
            // don't split if we reclaim any rows.
            do_split = !reclaim_deleted_rows(split_open_btree, leaf_pageno);
            // on return if !do_split then the latch on leaf_pageno is held
            // and will be released by the committing or aborting the
            // transaction.  If a purge has been done, no other action on
            // the page should be attempted (ie. a split) before committing
            // the purges.
            split_open_btree.close();
        }
    }
    long new_leaf_pageno = leaf_pageno;
    if (do_split) {
        // no space was reclaimed from deleted rows, so do split to allow
        // space for a subsequent insert.
        split_open_btree = new OpenBTree();
        split_open_btree.init(this.init_open_user_scans, split_xact, // open the container.
        null, split_xact.getRawStoreXact(), false, // use same mode this controller
        getOpenMode(), // was opened with
        TransactionManager.MODE_NONE, this.getConglomerate().getBtreeLockingPolicy(split_xact.getRawStoreXact(), this.init_lock_level, LockingPolicy.MODE_RECORD, TransactionController.ISOLATION_REPEATABLE_READ, // no base row locks during split
        (ConglomerateController) null, split_open_btree), this.getConglomerate(), (LogicalUndo) null, (DynamicCompiledOpenConglomInfo) null);
        // Get the root page back, and perform a split following the
        // to-be-inserted key.  The split releases the root page latch.
        root = ControlRow.get(split_open_btree, BTree.ROOTPAGEID);
        if (SanityManager.DEBUG)
            SanityManager.ASSERT(root.page.isLatched());
        new_leaf_pageno = root.splitFor(split_open_btree, scratch_template, null, rowToInsert, flag);
        split_open_btree.close();
    }
    split_xact.commit();
    split_xact.destroy();
    return (new_leaf_pageno);
}

Example 72 with ConglomerateController

use of org.apache.derby.iapi.store.access.ConglomerateController in project derby by apache.

the class CacheLock method saveProperty.

void saveProperty(TransactionController tc, String key, Serializable value) throws StandardException {
    if (saveServiceProperty(key, value))
        return;
    // Do a scan to see if the property already exists in the Conglomerate.
    ScanController scan = this.openScan(tc, key, TransactionController.OPENMODE_FORUPDATE);
    DataValueDescriptor[] row = makeNewTemplate();
    if (scan.fetchNext(row)) {
        if (value == null) {
            // A null input value means that we should delete the row
            scan.delete();
        } else {
            // a value already exists, just replace the second columm
            row[1] = new UserType(value);
            scan.replace(row, (FormatableBitSet) null);
        }
        scan.close();
    } else {
        // The value does not exist in the Conglomerate.
        scan.close();
        scan = null;
        if (value != null) {
            // not a delete request, so insert the new property.
            row = makeNewTemplate(key, value);
            ConglomerateController cc = tc.openConglomerate(propertiesConglomId, false, TransactionController.OPENMODE_FORUPDATE, TransactionController.MODE_TABLE, TransactionController.ISOLATION_SERIALIZABLE);
            cc.insert(row);
            cc.close();
        }
    }
}

Example 73 with ConglomerateController

use of org.apache.derby.iapi.store.access.ConglomerateController in project derby by apache.

the class B2I method lockTable.

/**
 * Lock the base table.
 * <p>
 * Assumes that segment of the base container is the same as the segment
 * of the btree segment.
 * <p>
 * RESOLVE - we really want to get the lock without opening the container.
 * raw store will be providing this.
 *
 * @param xact_manager Transaction to associate the lock with.
 *
 * @exception  StandardException  Standard exception policy.
 */
public final ConglomerateController lockTable(TransactionManager xact_manager, int open_mode, int lock_level, int isolation_level) throws StandardException {
    open_mode |= TransactionController.OPENMODE_FOR_LOCK_ONLY;
    // open the base conglomerate - just to get the table lock.
    ConglomerateController cc = xact_manager.openConglomerate(this.baseConglomerateId, false, open_mode, lock_level, isolation_level);
    return (cc);
}