//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes: //ORIGINAL LINE: @Test public void shouldReleaseSharedLock() public virtual void ShouldReleaseSharedLock() { // Given ForsetiClient clientA = mock(typeof(ForsetiClient)); SharedLock @lock = new SharedLock(clientA); // When assertTrue(@lock.Release(clientA)); // Then assertThat(@lock.NumberOfHolders(), equalTo(0)); assertThat(@lock.UpdateLock, equalTo(false)); }
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 TryExclusiveLock(ResourceType resourceType, long resourceId) { _hasLocks = true; _stateHolder.incrementActiveClients(this); try { ConcurrentMap <long, ForsetiLockManager.Lock> lockMap = _lockMaps[resourceType.TypeId()]; MutableLongIntMap heldLocks = _exclusiveLockCounts[resourceType.TypeId()]; int heldCount = heldLocks.getIfAbsent(resourceId, -1); if (heldCount != -1) { // We already have a lock on this, just increment our local reference counter. heldLocks.put(resourceId, Math.incrementExact(heldCount)); return(true); } // Grab the global lock ForsetiLockManager.Lock @lock; if ((@lock = lockMap.putIfAbsent(resourceId, _myExclusiveLock)) != null) { if (@lock is SharedLock && _sharedLockCounts[resourceType.TypeId()].containsKey(resourceId)) { SharedLock sharedLock = ( SharedLock )@lock; if (sharedLock.TryAcquireUpdateLock(this)) { if (sharedLock.NumberOfHolders() == 1) { heldLocks.put(resourceId, 1); return(true); } else { sharedLock.ReleaseUpdateLock(); return(false); } } } return(false); } heldLocks.put(resourceId, 1); return(true); } finally { _stateHolder.decrementActiveClients(); } }
//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes: //ORIGINAL LINE: @Test public void shouldUpgradeToUpdateLock() public virtual void ShouldUpgradeToUpdateLock() { // Given ForsetiClient clientA = mock(typeof(ForsetiClient)); ForsetiClient clientB = mock(typeof(ForsetiClient)); SharedLock @lock = new SharedLock(clientA); @lock.Acquire(clientB); // When assertTrue(@lock.TryAcquireUpdateLock(clientA)); // Then assertThat(@lock.NumberOfHolders(), equalTo(2)); assertThat(@lock.UpdateLock, equalTo(true)); }
/// <summary> /// Attempt to upgrade a share lock that we hold to an exclusive lock. </summary> //JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#: //ORIGINAL LINE: private boolean tryUpgradeToExclusiveWithShareLockHeld(org.neo4j.storageengine.api.lock.LockTracer tracer, org.neo4j.storageengine.api.lock.LockWaitEvent priorEvent, org.neo4j.storageengine.api.lock.ResourceType resourceType, long resourceId, SharedLock sharedLock, int tries, long waitStartMillis) throws org.neo4j.storageengine.api.lock.AcquireLockTimeoutException private bool TryUpgradeToExclusiveWithShareLockHeld(LockTracer tracer, LockWaitEvent priorEvent, ResourceType resourceType, long resourceId, SharedLock sharedLock, int tries, long waitStartMillis) { if (sharedLock.TryAcquireUpdateLock(this)) { LockWaitEvent waitEvent = null; try { // Now we just wait for all clients to release the the share lock while (sharedLock.NumberOfHolders() > 1) { AssertValid(waitStartMillis, resourceType, resourceId); if (waitEvent == null && priorEvent == null) { waitEvent = tracer.WaitForLock(true, resourceType, resourceId); } WaitFor(sharedLock, resourceType, resourceId, true, tries++); } return(true); } catch (Exception e) { sharedLock.ReleaseUpdateLock(); if (e is DeadlockDetectedException || e is LockClientStoppedException) { throw ( Exception )e; } throw new TransactionFailureException("Failed to upgrade shared lock to exclusive: " + sharedLock, e); } finally { if (waitEvent != null) { waitEvent.Close(); } ClearWaitList(); _waitingForLock = null; } } return(false); }
/// <summary> /// Attempt to upgrade a share lock to an exclusive lock, grabbing the share lock if we don't hold it. /// /// </summary> //JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#: //ORIGINAL LINE: private boolean tryUpgradeSharedToExclusive(org.neo4j.storageengine.api.lock.LockTracer tracer, org.neo4j.storageengine.api.lock.LockWaitEvent waitEvent, org.neo4j.storageengine.api.lock.ResourceType resourceType, java.util.concurrent.ConcurrentMap<long,ForsetiLockManager.Lock> lockMap, long resourceId, SharedLock sharedLock, long waitStartMillis) throws org.neo4j.storageengine.api.lock.AcquireLockTimeoutException private bool TryUpgradeSharedToExclusive(LockTracer tracer, LockWaitEvent waitEvent, ResourceType resourceType, ConcurrentMap <long, ForsetiLockManager.Lock> lockMap, long resourceId, SharedLock sharedLock, long waitStartMillis) { int tries = 0; bool holdsSharedLock = _sharedLockCounts[resourceType.TypeId()].containsKey(resourceId); if (!holdsSharedLock) { // We don't hold the shared lock, we need to grab it to upgrade it to an exclusive one if (!sharedLock.Acquire(this)) { return(false); } try { if (TryUpgradeToExclusiveWithShareLockHeld(tracer, waitEvent, resourceType, resourceId, sharedLock, tries, waitStartMillis)) { return(true); } else { ReleaseGlobalLock(lockMap, resourceId); return(false); } } catch (Exception e) { ReleaseGlobalLock(lockMap, resourceId); throw e; } } else { // We do hold the shared lock, so no reason to deal with the complexity in the case above. return(TryUpgradeToExclusiveWithShareLockHeld(tracer, waitEvent, resourceType, resourceId, sharedLock, tries, waitStartMillis)); } }
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#: //ORIGINAL LINE: public void acquireExclusive(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 AcquireExclusive(LockTracer tracer, ResourceType resourceType, params long[] resourceIds) { _hasLocks = true; _stateHolder.incrementActiveClients(this); LockWaitEvent waitEvent = null; try { ConcurrentMap <long, ForsetiLockManager.Lock> lockMap = _lockMaps[resourceType.TypeId()]; MutableLongIntMap heldLocks = _exclusiveLockCounts[resourceType.TypeId()]; foreach (long resourceId in resourceIds) { int heldCount = heldLocks.getIfAbsent(resourceId, -1); if (heldCount != -1) { // We already have a lock on this, just increment our local reference counter. heldLocks.put(resourceId, Math.incrementExact(heldCount)); continue; } // Grab the global lock ForsetiLockManager.Lock existingLock; int tries = 0; long waitStartMillis = _clock.millis(); while ((existingLock = lockMap.putIfAbsent(resourceId, _myExclusiveLock)) != null) { AssertValid(waitStartMillis, resourceType, resourceId); // If this is a shared lock: // Given a grace period of tries (to try and not starve readers), grab an update lock and wait // for it to convert to an exclusive lock. if (tries > 50 && existingLock is SharedLock) { // Then we should upgrade that lock SharedLock sharedLock = ( SharedLock )existingLock; if (TryUpgradeSharedToExclusive(tracer, waitEvent, resourceType, lockMap, resourceId, sharedLock, waitStartMillis)) { break; } } if (waitEvent == null) { waitEvent = tracer.WaitForLock(true, resourceType, resourceId); } WaitFor(existingLock, resourceType, resourceId, true, tries++); } heldLocks.put(resourceId, 1); } } finally { if (waitEvent != null) { waitEvent.Close(); } ClearWaitList(); _waitingForLock = null; _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(); } }