/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2002-2006
* Sleepycat Software. All rights reserved.
*
* $Id: LatchedLockManager.java,v 1.9 2006/01/09 12:44:40 cwl Exp $
*/
package com.sleepycat.je.txn;
import java.util.Set;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.LockStats;
import com.sleepycat.je.dbi.DatabaseImpl;
import com.sleepycat.je.dbi.EnvironmentImpl;
import com.sleepycat.je.dbi.MemoryBudget;
import com.sleepycat.je.latch.Latch;
/**
* LatchedLockManager uses latches to implement its critical sections.
*/
public class LatchedLockManager extends LockManager {
public LatchedLockManager(EnvironmentImpl envImpl)
throws DatabaseException {
super(envImpl);
}
/**
* @see LockManager#attemptLock
*/
protected LockAttemptResult attemptLock(Long nodeId,
Locker locker,
LockType type,
boolean nonBlockingRequest)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
return attemptLockInternal(nodeId, locker, type,
nonBlockingRequest, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#makeTimeoutMsg
*/
protected String makeTimeoutMsg(String lockOrTxn,
Locker locker,
long nodeId,
LockType type,
LockGrantType grantType,
Lock useLock,
long timeout,
long start,
long now,
DatabaseImpl database)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
return makeTimeoutMsgInternal(lockOrTxn, locker,
nodeId, type, grantType,
useLock, timeout, start, now,
database);
} finally {
latch.release();
}
}
/**
* @see LockManager#releaseAndNotifyTargets
*/
protected Set releaseAndFindNotifyTargets(long nodeId,
Lock lock,
Locker locker,
boolean removeFromLocker)
throws DatabaseException {
long nid = nodeId;
if (nid == -1) {
nid = lock.getNodeId().longValue();
}
int lockTableIndex = getLockTableIndex(nid);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
return releaseAndFindNotifyTargetsInternal
(nodeId, lock, locker, removeFromLocker, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#transfer
*/
void transfer(long nodeId,
Locker owningLocker,
Locker destLocker,
boolean demoteToRead)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
transferInternal(nodeId, owningLocker, destLocker,
demoteToRead, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#transferMultiple
*/
void transferMultiple(long nodeId,
Locker owningLocker,
Locker [] destLockers)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
transferMultipleInternal(nodeId, owningLocker,
destLockers, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#demote
*/
void demote(long nodeId, Locker locker)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
demoteInternal(nodeId, locker, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#isLocked
*/
boolean isLocked(Long nodeId)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
return isLockedInternal(nodeId, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#isOwner
*/
boolean isOwner(Long nodeId, Locker locker, LockType type)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
return isOwnerInternal(nodeId, locker, type, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#isWaiter
*/
boolean isWaiter(Long nodeId, Locker locker)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
return isWaiterInternal(nodeId, locker, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#nWaiters
*/
int nWaiters(Long nodeId)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
return nWaitersInternal(nodeId, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#nOwners
*/
int nOwners(Long nodeId)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
return nOwnersInternal(nodeId, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#getWriterOwnerLocker
*/
Locker getWriteOwnerLocker(Long nodeId)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
return getWriteOwnerLockerInternal(nodeId, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#validateOwnership
*/
protected boolean validateOwnership(Long nodeId,
Locker locker,
LockType type,
boolean flushFromWaiters,
MemoryBudget mb)
throws DatabaseException {
int lockTableIndex = getLockTableIndex(nodeId);
Latch latch = lockTableLatches[lockTableIndex];
latch.acquire();
try {
return validateOwnershipInternal
(nodeId, locker, type, flushFromWaiters, mb, lockTableIndex);
} finally {
latch.release();
}
}
/**
* @see LockManager#dumpLockTable
*/
protected void dumpLockTable(LockStats stats)
throws DatabaseException {
for (int i = 0; i < nLockTables; i++) {
lockTableLatches[i].acquire();
try {
dumpLockTableInternal(stats, i);
} finally {
lockTableLatches[i].release();
}
}
}
}