public override void ReleaseShared(ResourceType resourceType, params long[] resourceIds)
{
_stateHolder.incrementActiveClients(this);
try
{
MutableLongIntMap sharedLocks = _sharedLockCounts[resourceType.TypeId()];
MutableLongIntMap exclusiveLocks = _exclusiveLockCounts[resourceType.TypeId()];
ConcurrentMap <long, ForsetiLockManager.Lock> resourceTypeLocks = _lockMaps[resourceType.TypeId()];
foreach (long resourceId in resourceIds)
{
if (ReleaseLocalLock(resourceType, resourceId, sharedLocks))
{
continue;
}
// Only release if we were not holding an exclusive lock as well
if (!exclusiveLocks.containsKey(resourceId))
{
ReleaseGlobalLock(resourceTypeLocks, resourceId);
}
}
}
finally
{
_stateHolder.decrementActiveClients();
}
}
public override bool ReEnterShared(ResourceType resourceType, long resourceId)
{
_stateHolder.incrementActiveClients(this);
try
{
MutableLongIntMap heldShareLocks = _sharedLockCounts[resourceType.TypeId()];
MutableLongIntMap heldExclusiveLocks = _exclusiveLockCounts[resourceType.TypeId()];
int heldCount = heldShareLocks.getIfAbsent(resourceId, -1);
if (heldCount != -1)
{
// We already have a lock on this, just increment our local reference counter.
heldShareLocks.put(resourceId, Math.incrementExact(heldCount));
return(true);
}
if (heldExclusiveLocks.containsKey(resourceId))
{
// We already have an exclusive lock, so just leave that in place. When the exclusive lock is released,
// it will be automatically downgraded to a shared lock, since we bumped the share lock reference count.
heldShareLocks.put(resourceId, 1);
return(true);
}
// We didn't hold a lock already, so we cannot re-enter.
return(false);
}
finally
{
_stateHolder.decrementActiveClients();
}
}
public override void ReleaseExclusive(ResourceType resourceType, params long[] resourceIds)
{
_stateHolder.incrementActiveClients(this);
try
{
ConcurrentMap <long, ForsetiLockManager.Lock> resourceTypeLocks = _lockMaps[resourceType.TypeId()];
MutableLongIntMap exclusiveLocks = _exclusiveLockCounts[resourceType.TypeId()];
MutableLongIntMap sharedLocks = _sharedLockCounts[resourceType.TypeId()];
foreach (long resourceId in resourceIds)
{
if (ReleaseLocalLock(resourceType, resourceId, exclusiveLocks))
{
continue;
}
if (sharedLocks.containsKey(resourceId))
{
// We are still holding a shared lock, so we will release it to be reused
ForsetiLockManager.Lock @lock = resourceTypeLocks.get(resourceId);
if (@lock is SharedLock)
{
SharedLock sharedLock = ( SharedLock )@lock;
if (sharedLock.UpdateLock)
{
sharedLock.ReleaseUpdateLock();
}
else
{
throw new System.InvalidOperationException("Incorrect state of exclusive lock. Lock should be updated " + "to exclusive before attempt to release it. Lock: " + this);
}
}
else
{
// in case if current lock is exclusive we swap it to new shared lock
SharedLock sharedLock = new SharedLock(this);
resourceTypeLocks.put(resourceId, sharedLock);
}
}
else
{
// we do not hold shared lock so we just releasing it
ReleaseGlobalLock(resourceTypeLocks, resourceId);
}
}
}
finally
{
_stateHolder.decrementActiveClients();
}
}
public override bool TrySharedLock(ResourceType resourceType, long resourceId)
{
_hasLocks = true;
_stateHolder.incrementActiveClients(this);
try
{
ConcurrentMap <long, ForsetiLockManager.Lock> lockMap = _lockMaps[resourceType.TypeId()];
MutableLongIntMap heldShareLocks = _sharedLockCounts[resourceType.TypeId()];
MutableLongIntMap heldExclusiveLocks = _exclusiveLockCounts[resourceType.TypeId()];
int heldCount = heldShareLocks.getIfAbsent(resourceId, -1);
if (heldCount != -1)
{
// We already have a lock on this, just increment our local reference counter.
heldShareLocks.put(resourceId, Math.incrementExact(heldCount));
return(true);
}
if (heldExclusiveLocks.containsKey(resourceId))
{
// We already have an exclusive lock, so just leave that in place. When the exclusive lock is released,
// it will be automatically downgraded to a shared lock, since we bumped the share lock reference count.
heldShareLocks.put(resourceId, 1);
return(true);
}
long waitStartMillis = _clock.millis();
while (true)
{
AssertValid(waitStartMillis, resourceType, resourceId);
ForsetiLockManager.Lock existingLock = lockMap.get(resourceId);
if (existingLock == null)
{
// Try to create a new shared lock
if (lockMap.putIfAbsent(resourceId, new SharedLock(this)) == null)
{
// Success!
break;
}
}
else if (existingLock is SharedLock)
{
// Note that there is a "safe" race here where someone may be releasing the last reference to a lock
// and thus removing that lock instance (making it unacquirable). In this case, we allow retrying,
// even though this is a try-lock call.
if ((( SharedLock )existingLock).Acquire(this))
{
// Success!
break;
}
else if ((( SharedLock )existingLock).UpdateLock)
{
return(false);
}
}
else if (existingLock is ExclusiveLock)
{
return(false);
}
else
{
throw new System.NotSupportedException("Unknown lock type: " + existingLock);
}
}
heldShareLocks.put(resourceId, 1);
return(true);
}
finally
{
_stateHolder.decrementActiveClients();
}
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public void acquireShared(org.neo4j.storageengine.api.lock.LockTracer tracer, org.neo4j.storageengine.api.lock.ResourceType resourceType, long... resourceIds) throws org.neo4j.storageengine.api.lock.AcquireLockTimeoutException
public override void AcquireShared(LockTracer tracer, ResourceType resourceType, params long[] resourceIds)
{
_hasLocks = true;
_stateHolder.incrementActiveClients(this);
LockWaitEvent waitEvent = null;
try
{
// Grab the global lock map we will be using
ConcurrentMap <long, ForsetiLockManager.Lock> lockMap = _lockMaps[resourceType.TypeId()];
// And grab our local lock maps
MutableLongIntMap heldShareLocks = _sharedLockCounts[resourceType.TypeId()];
MutableLongIntMap heldExclusiveLocks = _exclusiveLockCounts[resourceType.TypeId()];
foreach (long resourceId in resourceIds)
{
// First, check if we already hold this as a shared lock
int heldCount = heldShareLocks.getIfAbsent(resourceId, -1);
if (heldCount != -1)
{
// We already have a lock on this, just increment our local reference counter.
heldShareLocks.put(resourceId, Math.incrementExact(heldCount));
continue;
}
// Second, check if we hold it as an exclusive lock
if (heldExclusiveLocks.containsKey(resourceId))
{
// We already have an exclusive lock, so just leave that in place.
// When the exclusive lock is released, it will be automatically downgraded to a shared lock,
// since we bumped the share lock reference count.
heldShareLocks.put(resourceId, 1);
continue;
}
// We don't hold the lock, so we need to grab it via the global lock map
int tries = 0;
SharedLock mySharedLock = null;
long waitStartMillis = _clock.millis();
// Retry loop
while (true)
{
AssertValid(waitStartMillis, resourceType, resourceId);
// Check if there is a lock for this entity in the map
ForsetiLockManager.Lock existingLock = lockMap.get(resourceId);
// No lock
if (existingLock == null)
{
// Try to create a new shared lock
if (mySharedLock == null)
{
mySharedLock = new SharedLock(this);
}
if (lockMap.putIfAbsent(resourceId, mySharedLock) == null)
{
// Success, we now hold the shared lock.
break;
}
else
{
continue;
}
}
// Someone holds shared lock on this entity, try and get in on that action
else if (existingLock is SharedLock)
{
if ((( SharedLock )existingLock).Acquire(this))
{
// Success!
break;
}
}
// Someone holds an exclusive lock on this entity
else if (existingLock is ExclusiveLock)
{
// We need to wait, just let the loop run.
}
else
{
throw new System.NotSupportedException("Unknown lock type: " + existingLock);
}
if (waitEvent == null)
{
waitEvent = tracer.WaitForLock(false, resourceType, resourceId);
}
// And take note of who we are waiting for. This is used for deadlock detection.
WaitFor(existingLock, resourceType, resourceId, false, tries++);
}
// Make a local note about the fact that we now hold this lock
heldShareLocks.put(resourceId, 1);
}
}
finally
{
if (waitEvent != null)
{
waitEvent.Close();
}
ClearWaitList();
_waitingForLock = null;
_stateHolder.decrementActiveClients();
}
}
