/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2002,2008 Oracle.  All rights reserved.
 *
 * $Id: DummyLockManager.java,v 1.11 2008/05/15 01:52:43 linda Exp $
 */

package com.sleepycat.je.txn;

import java.util.Set;

import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.DeadlockException;
import com.sleepycat.je.LockStats;
import com.sleepycat.je.dbi.DatabaseImpl;
import com.sleepycat.je.dbi.EnvironmentImpl;
import com.sleepycat.je.dbi.MemoryBudget;

/**
 * DummyLockManager performs no locking for DS mode.
 */
public class DummyLockManager extends LockManager {

    public DummyLockManager(EnvironmentImpl envImpl)
    	throws DatabaseException {

        super(envImpl);
    }

    /**
     * @see LockManager#lookupLock
     */
    protected Lock lookupLock(Long nodeId)
	throws DatabaseException {

	return null;
    }

    /**
     * @see LockManager#attemptLock
     */
    protected LockAttemptResult attemptLock(Long nodeId,
                                            Locker locker,
                                            LockType type,
                                            boolean nonBlockingRequest)
        throws DatabaseException {

	return new LockAttemptResult(null, LockGrantType.NEW, true);
    }

    /**
     * @see LockManager#makeTimeoutMsg
     */
    protected DeadlockException makeTimeoutMsg(String lockOrTxn,
					       Locker locker,
					       long nodeId,
					       LockType type,
					       LockGrantType grantType,
					       Lock useLock,
					       long timeout,
					       long start,
					       long now,
					       DatabaseImpl database) {

	return null;
    }

    /**
     * @see LockManager#releaseAndNotifyTargets
     */
    protected Set<Locker> releaseAndFindNotifyTargets(long nodeId, Locker locker)
        throws DatabaseException {

	return null;
    }

    /**
     * @see LockManager#transfer
     */
    void transfer(long nodeId,
                  Locker owningLocker,
                  Locker destLocker,
                  boolean demoteToRead)
        throws DatabaseException {

    }

    /**
     * @see LockManager#transferMultiple
     */
    void transferMultiple(long nodeId,
                          Locker owningLocker,
                          Locker[] destLockers)
        throws DatabaseException {

    }

    /**
     * @see LockManager#demote
     */
    void demote(long nodeId, Locker locker)
        throws DatabaseException {

    }

    /**
     * @see LockManager#isLocked
     */
    boolean isLocked(Long nodeId) {

	return false;
    }

    /**
     * @see LockManager#isOwner
     */
    boolean isOwner(Long nodeId, Locker locker, LockType type) {

	return false;
    }

    /**
     * @see LockManager#isWaiter
     */
    boolean isWaiter(Long nodeId, Locker locker) {

	return false;
    }

    /**
     * @see LockManager#nWaiters
     */
    int nWaiters(Long nodeId) {

	return 0;
    }

    /**
     * @see LockManager#nOwners
     */
    int nOwners(Long nodeId) {

	return 0;
    }

    /**
     * @see LockManager#getWriterOwnerLocker
     */
    Locker getWriteOwnerLocker(Long nodeId)
        throws DatabaseException {

	return null;
    }

    /**
     * @see LockManager#validateOwnership
     */
    protected boolean validateOwnership(Long nodeId,
                                        Locker locker,
                                        LockType type,
                                        boolean flushFromWaiters,
					MemoryBudget mb)
        throws DatabaseException {

	return true;
    }

    /**
     * @see LockManager#dumpLockTable
     */
    protected void dumpLockTable(LockStats stats)
        throws DatabaseException {

    }
}
