Examples with Transaction org.cojen.tupl.Transaction used on opensource projects

Example 6 with Transaction

use of org.cojen.tupl.Transaction in project Tupl by cojen.

the class JoinedRowUpdater method updateCurrent.

private void updateCurrent() throws IOException {
    Transaction txn = txn();
    Object old = attachAccessor(txn);
    try {
        mPrimaryUpdater.mRow = mRow;
        mPrimaryUpdater.joinedUpdateCurrent();
    } finally {
        txn.attach(old);
    }
}

Example 7 with Transaction

use of org.cojen.tupl.Transaction in project Tupl by cojen.

the class JoinedRowUpdater method deleteCurrent.

private void deleteCurrent() throws IOException {
    Transaction txn = txn();
    Object old = attachAccessor(txn);
    try {
        mPrimaryUpdater.mRow = mRow;
        mPrimaryUpdater.deleteCurrent();
    } finally {
        txn.attach(old);
    }
}

Example 8 with Transaction

use of org.cojen.tupl.Transaction in project Tupl by cojen.

the class NonRepeatableRowUpdater method toFirst.

@Override
protected LockResult toFirst(Cursor c) throws IOException {
    Transaction txn = c.link();
    LockMode original = txn.lockMode();
    txn.lockMode(LockMode.UPGRADABLE_READ);
    try {
        return mLockResult = super.toFirst(c);
    } finally {
        txn.lockMode(original);
    }
}

Example 9 with Transaction

use of org.cojen.tupl.Transaction in project Tupl by cojen.

the class CursorNonRepeatableUpdater method step.

@Override
public boolean step() throws IOException {
    LockResult result = mLockResult;
    if (result == null) {
        return false;
    }
    Cursor c = mCursor;
    Transaction txn = c.link();
    tryStep: {
        try {
            if (result.isAcquired()) {
                // If the transaction is being acted upon independently of this updater,
                // then this technique might throw an IllegalStateException.
                txn.unlock();
            }
            LockMode original = txn.lockMode();
            txn.lockMode(LockMode.UPGRADABLE_READ);
            try {
                result = c.next();
            } finally {
                txn.lockMode(original);
            }
        } catch (UnpositionedCursorException e) {
            break tryStep;
        } catch (Throwable e) {
            throw Utils.fail(this, e);
        }
        if (c.key() != null) {
            mLockResult = result;
            return true;
        }
    }
    mLockResult = null;
    return false;
}

Example 10 with Transaction

use of org.cojen.tupl.Transaction in project Tupl by cojen.

the class JoinedScanController method join.

// Subclass should implement one of these methods. The secondaryValue param is required
// for alternate keys.
// protected static byte[] toPrimaryKey(byte[] secondaryKey);
// protected static byte[] toPrimaryKey(byte[] secondaryKey, byte[] secondaryValue);
/**
 * Given a positioned cursor over the secondary index and a decoded primary key, return the
 * associated primary value, or null if not found.
 *
 * @param secondaryCursor must have a non-null transaction
 */
protected byte[] join(Cursor secondaryCursor, LockResult result, byte[] primaryKey) throws IOException {
    Transaction txn = secondaryCursor.link();
    byte[] primaryValue = mPrimaryIndex.load(txn, primaryKey);
    if (result == LockResult.ACQUIRED && txn.lastLockedKey() == primaryKey && txn.lastLockedIndex() == mPrimaryIndex.id()) {
        // Combine the secondary and primary locks together, so that they can be released
        // together if the row is filtered out.
        txn.unlockCombine();
    }
    return validate(secondaryCursor, txn, primaryValue);
}