543 lines
24 KiB
C#
543 lines
24 KiB
C#
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//----------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//----------------------------------------------------------------
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namespace System.Runtime.DurableInstancing
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{
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using System.Collections.Generic;
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using System.Threading;
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using System.Xml.Linq;
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[Fx.Tag.XamlVisible(false)]
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public sealed class InstanceOwner
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{
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// These collections are synchronized by the HandlesLock.
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readonly Dictionary<Guid, InstanceHandle> boundHandles = new Dictionary<Guid, InstanceHandle>();
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readonly Queue<InstanceHandleReference> inProgressHandles = new Queue<InstanceHandleReference>();
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readonly Dictionary<Guid, Queue<InstanceHandleReference>> inProgressHandlesPerInstance = new Dictionary<Guid, Queue<InstanceHandleReference>>();
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// This is synchronized by the InstanceStore.
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readonly Dictionary<XName, InstanceNormalEvent> events = new Dictionary<XName, InstanceNormalEvent>(1);
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internal InstanceOwner(Guid ownerId, Guid lockToken)
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{
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InstanceOwnerId = ownerId;
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OwnerToken = lockToken;
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}
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public Guid InstanceOwnerId { get; private set; }
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internal Guid OwnerToken { get; private set; }
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internal Dictionary<XName, InstanceNormalEvent> Events
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{
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get
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{
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return this.events;
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}
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}
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object HandlesLock
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{
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get
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{
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return this.boundHandles;
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}
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}
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Dictionary<Guid, InstanceHandle> BoundHandles
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{
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get
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{
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return this.boundHandles;
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}
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}
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Queue<InstanceHandleReference> InProgressHandles
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{
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get
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{
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return this.inProgressHandles;
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}
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}
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Dictionary<Guid, Queue<InstanceHandleReference>> InProgressHandlesPerInstance
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{
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get
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{
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return this.inProgressHandlesPerInstance;
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}
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}
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// This can be called to remove a handle from the BoundHandles table. It should be called only after no more commands are in progress or could be made on the handle.
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internal void Unbind(InstanceHandle handle)
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{
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Fx.Assert(object.ReferenceEquals(this, handle.Owner), "Unbind called on the wrong owner for a handle.");
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Fx.Assert(handle.Id != Guid.Empty, "Unbind called on a handle not even bound to an instance.");
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lock (HandlesLock)
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{
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// The handle may have already been bumped - only remove it if it's still it.
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InstanceHandle existingHandle;
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if (BoundHandles.TryGetValue(handle.Id, out existingHandle) && object.ReferenceEquals(handle, existingHandle))
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{
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BoundHandles.Remove(handle.Id);
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}
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}
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}
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// This doesn't check the bound handles, since one of the scenarios is to re-bind to an instance and kick out the stale handle.
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internal void StartBind(InstanceHandle handle, ref InstanceHandleReference reference)
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{
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Fx.Assert(object.ReferenceEquals(this, handle.Owner), "StartBind called on the wrong owner for a handle.");
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lock (HandlesLock)
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{
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Fx.Assert(reference == null, "Already have a bind in progress.");
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reference = new InstanceHandleReference(handle);
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EnqueueReference(reference);
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}
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}
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// This happens only when the transaction under which the handle was bound is committed.
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internal bool TryCompleteBind(ref InstanceHandleReference reference, ref List<InstanceHandleReference> handlesPendingResolution, out InstanceHandle handleToFree)
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{
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Fx.Assert(reference != null, "Bind wasn't registered - RegisterStartBind must be called.");
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Fx.Assert(reference.InstanceHandle != null, "Cannot cancel and complete a bind.");
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Fx.Assert(reference.InstanceHandle.Version != -1, "Handle state must be set first.");
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Fx.Assert(object.ReferenceEquals(this, reference.InstanceHandle.Owner), "TryCompleteBind called on the wrong owner for a handle.");
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Fx.Assert(!(reference is LockResolutionMarker) || ((LockResolutionMarker)reference).NonConflicting, "How did a Version get set if we're still resolving.");
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handleToFree = null;
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lock (HandlesLock)
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{
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try
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{
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InstanceHandle existingHandle;
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if (BoundHandles.TryGetValue(reference.InstanceHandle.Id, out existingHandle))
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{
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Fx.AssertAndFailFast(!object.ReferenceEquals(existingHandle, reference.InstanceHandle), "InstanceStore lock state is not correct.");
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if (existingHandle.Version <= 0 || reference.InstanceHandle.Version <= 0)
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{
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if (existingHandle.Version != 0 || reference.InstanceHandle.Version != 0)
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{
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throw Fx.Exception.AsError(new InvalidOperationException(SRCore.InvalidLockToken));
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}
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reference.InstanceHandle.ConflictingHandle = existingHandle;
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return false;
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}
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if (existingHandle.Version > reference.InstanceHandle.Version)
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{
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reference.InstanceHandle.ConflictingHandle = existingHandle;
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return false;
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}
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if (existingHandle.Version < reference.InstanceHandle.Version)
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{
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existingHandle.ConflictingHandle = reference.InstanceHandle;
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handleToFree = existingHandle;
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BoundHandles[reference.InstanceHandle.Id] = reference.InstanceHandle;
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return true;
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}
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if (existingHandle.Version == reference.InstanceHandle.Version)
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{
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// This could be a case of amnesia (backup / restore).
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throw Fx.Exception.AsError(new InvalidOperationException(SRCore.InstanceStoreBoundSameVersionTwice));
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}
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throw Fx.AssertAndThrow("All cases covered above.");
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}
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else
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{
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BoundHandles.Add(reference.InstanceHandle.Id, reference.InstanceHandle);
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return true;
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}
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}
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finally
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{
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CancelReference(ref reference, ref handlesPendingResolution);
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}
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}
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}
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// This is called if we found an existing lock. This handle doesn't own the lock, but it could claim it, if it can prove
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// that no other live handle owns it. If this returns non-null, the outcome will be available later on the
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// InstanceHandleReference once the AsyncWaitHandle completes. (Null indicates a conflict with another handle.)
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//
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// The instanceVersion reported here was read under the transaction, but not changed. Either it was already committed, or it was written under
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// this transaction in a prior command on a different handle. Due to the latter case, we treat it as dirty - we do not publish it or take
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// any visible action (such as dooming handles) based on its value.
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internal AsyncWaitHandle InitiateLockResolution(long instanceVersion, ref InstanceHandleReference reference, ref List<InstanceHandleReference> handlesPendingResolution)
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{
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Fx.Assert(reference != null, "Bind wasn't registered - RegisterStartBind must be called.");
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Fx.Assert(reference.InstanceHandle != null, "Cannot cancel and complete a bind.");
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Fx.Assert(reference.InstanceHandle.Id != Guid.Empty, "Must be bound to an instance already.");
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Fx.AssertAndThrow(!(reference is LockResolutionMarker), "InitiateLockResolution already called.");
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lock (HandlesLock)
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{
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InstanceHandleReference cancelReference = reference;
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LockResolutionMarker markerReference = null;
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try
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{
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InstanceHandle existingHandle;
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if (BoundHandles.TryGetValue(reference.InstanceHandle.Id, out existingHandle))
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{
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Fx.AssertAndFailFast(!object.ReferenceEquals(existingHandle, reference.InstanceHandle), "InstanceStore lock state is not correct in InitiateLockResolution.");
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if (existingHandle.Version <= 0 || instanceVersion <= 0)
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{
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if (existingHandle.Version != 0 || instanceVersion != 0)
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{
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throw Fx.Exception.AsError(new InvalidOperationException(SRCore.InvalidLockToken));
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}
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reference.InstanceHandle.ConflictingHandle = existingHandle;
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return null;
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}
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if (existingHandle.Version >= instanceVersion)
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{
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reference.InstanceHandle.ConflictingHandle = existingHandle;
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return null;
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}
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}
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// Put a marker in the InProgressHandles. If it makes it through, and there's still no conflicting handle,
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// then the lock can be claimed at this version. Only currently in-progress bindings have a chance of
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// staking a stronger claim to the lock version (if the store actually acquired the lock for the handle).
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markerReference = new LockResolutionMarker(reference.InstanceHandle, instanceVersion);
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EnqueueReference(markerReference);
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reference = markerReference;
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Fx.Assert(markerReference.MarkerWaitHandle != null, "Null MarkerWaitHandle?");
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return markerReference.MarkerWaitHandle;
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}
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finally
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{
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if (!object.ReferenceEquals(markerReference, reference))
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{
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CancelReference(ref reference, ref handlesPendingResolution);
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if (markerReference != null)
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{
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cancelReference = markerReference;
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CancelReference(ref cancelReference, ref handlesPendingResolution);
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}
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}
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else
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{
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CancelReference(ref cancelReference, ref handlesPendingResolution);
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}
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}
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}
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}
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// Called when a handle is bound to an instance while the handle is in-progress for a lock. This can progress the queue-states since
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// this once can move from the general queue to the per-instance queue.
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internal void InstanceBound(ref InstanceHandleReference reference, ref List<InstanceHandleReference> handlesPendingResolution)
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{
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Fx.Assert(reference != null, "InstanceBound called when no operation is in progress.");
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Fx.Assert(reference.InstanceHandle != null, "InstanceBound called after cancelling.");
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Fx.Assert(reference.InstanceHandle.Id != Guid.Empty, "InstanceBound called, but the handle isn't bound.");
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Fx.AssertAndThrow(!(reference is LockResolutionMarker), "InstanceBound called after trying to bind the lock version, which alredy required an instance.");
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lock (HandlesLock)
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{
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ProcessInProgressHandles(ref handlesPendingResolution);
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}
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}
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internal void CancelBind(ref InstanceHandleReference reference, ref List<InstanceHandleReference> handlesPendingResolution)
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{
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Fx.Assert(reference != null, "Bind not in progress.");
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Fx.Assert(reference.InstanceHandle != null, "Reference already canceled in CancelBind.");
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Fx.Assert(object.ReferenceEquals(this, reference.InstanceHandle.Owner), "CancelBind called on the wrong owner for a handle.");
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lock (HandlesLock)
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{
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CancelReference(ref reference, ref handlesPendingResolution);
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}
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}
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internal void FaultBind(ref InstanceHandleReference reference, ref List<InstanceHandleReference> handlesPendingResolution, Exception reason)
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{
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Fx.Assert(reference != null, "Bind not in progress in FaultBind.");
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Fx.Assert(reference.InstanceHandle != null, "Reference already canceled in FaultBind.");
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Fx.Assert(object.ReferenceEquals(this, reference.InstanceHandle.Owner), "FaultBind called on the wrong owner for a handle.");
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lock (HandlesLock)
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{
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LockResolutionMarker marker = reference as LockResolutionMarker;
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if (marker != null && !marker.IsComplete)
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{
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try
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{
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// Nothing to do here - following the patterns of dealing with handlesPendingResolution and setting NotifyMarkerComplete in a finally.
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}
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finally
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{
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marker.Reason = reason ?? new OperationCanceledException(SRCore.HandleFreed);
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marker.NotifyMarkerComplete(false);
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if (handlesPendingResolution == null)
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{
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handlesPendingResolution = new List<InstanceHandleReference>(1);
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}
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handlesPendingResolution.Add(marker);
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}
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}
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}
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}
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internal bool FinishBind(ref InstanceHandleReference reference, ref long instanceVersion, ref List<InstanceHandleReference> handlesPendingResolution)
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{
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Fx.Assert(reference != null, "Bind not in progress in FinishBind.");
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Fx.Assert(reference.InstanceHandle != null, "Reference already canceled in FinishBind.");
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Fx.Assert(object.ReferenceEquals(this, reference.InstanceHandle.Owner), "FinishBind called on the wrong owner for a handle.");
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Fx.Assert(reference is LockResolutionMarker, "Must have started reclaim in order to finish it.");
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lock (HandlesLock)
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{
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LockResolutionMarker marker = (LockResolutionMarker)reference;
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Fx.AssertAndThrow(marker.IsComplete, "Called FinishBind prematurely.");
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if (marker.NonConflicting)
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{
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instanceVersion = marker.InstanceVersion;
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return true;
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}
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try
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{
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if (marker.Reason != null)
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{
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throw Fx.Exception.AsError(marker.Reason);
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}
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Fx.Assert(marker.ConflictingHandle != null, "Should either have a conflicting handle or a reason in the conflicting case.");
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marker.InstanceHandle.ConflictingHandle = marker.ConflictingHandle;
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return false;
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}
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finally
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{
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CancelReference(ref reference, ref handlesPendingResolution);
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}
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}
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}
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// Must be called with HandlesLock held.
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void CancelReference(ref InstanceHandleReference reference, ref List<InstanceHandleReference> handlesPendingResolution)
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{
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Guid wasBoundToInstanceId = reference.InstanceHandle.Id;
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try
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{
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LockResolutionMarker marker = reference as LockResolutionMarker;
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if (marker != null && !marker.IsComplete)
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{
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if (handlesPendingResolution == null)
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{
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handlesPendingResolution = new List<InstanceHandleReference>(1);
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}
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handlesPendingResolution.Add(marker);
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}
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}
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finally
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{
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reference.Cancel();
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reference = null;
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}
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ProcessInProgressHandles(ref handlesPendingResolution);
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if (wasBoundToInstanceId != Guid.Empty)
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{
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Queue<InstanceHandleReference> instanceQueue;
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if (InProgressHandlesPerInstance.TryGetValue(wasBoundToInstanceId, out instanceQueue))
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{
|
|||
|
|
while (instanceQueue.Count > 0)
|
|||
|
|
{
|
|||
|
|
InstanceHandleReference handleRef = instanceQueue.Peek();
|
|||
|
|
if (handleRef.InstanceHandle != null)
|
|||
|
|
{
|
|||
|
|
if (CheckOldestReference(handleRef, ref handlesPendingResolution))
|
|||
|
|
{
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
instanceQueue.Dequeue();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (instanceQueue.Count == 0)
|
|||
|
|
{
|
|||
|
|
InProgressHandlesPerInstance.Remove(wasBoundToInstanceId);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Must be called with HandlesLock held.
|
|||
|
|
// This process the top-level InProgressHandles queue, demuxing entries into the per-instance queues and completing markers.
|
|||
|
|
void ProcessInProgressHandles(ref List<InstanceHandleReference> handlesPendingResolution)
|
|||
|
|
{
|
|||
|
|
while (InProgressHandles.Count > 0)
|
|||
|
|
{
|
|||
|
|
InstanceHandleReference handleRef = InProgressHandles.Peek();
|
|||
|
|
if (handleRef.InstanceHandle != null)
|
|||
|
|
{
|
|||
|
|
if (handleRef.InstanceHandle.Id == Guid.Empty)
|
|||
|
|
{
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
Queue<InstanceHandleReference> acceptingQueue;
|
|||
|
|
if (!InProgressHandlesPerInstance.TryGetValue(handleRef.InstanceHandle.Id, out acceptingQueue))
|
|||
|
|
{
|
|||
|
|
if (CheckOldestReference(handleRef, ref handlesPendingResolution))
|
|||
|
|
{
|
|||
|
|
acceptingQueue = new Queue<InstanceHandleReference>(2);
|
|||
|
|
acceptingQueue.Enqueue(handleRef);
|
|||
|
|
InProgressHandlesPerInstance.Add(handleRef.InstanceHandle.Id, acceptingQueue);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
// It's ok to enqueue first, then dequeue, to err on the side of duplicates. Duplicates do not cause a problem.
|
|||
|
|
acceptingQueue.Enqueue(handleRef);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
InProgressHandles.Dequeue();
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Must be called with HandlesLock held.
|
|||
|
|
void EnqueueReference(InstanceHandleReference handleRef)
|
|||
|
|
{
|
|||
|
|
if (InProgressHandles.Count > 0)
|
|||
|
|
{
|
|||
|
|
InProgressHandles.Enqueue(handleRef);
|
|||
|
|
}
|
|||
|
|
else if (handleRef.InstanceHandle.Id != Guid.Empty)
|
|||
|
|
{
|
|||
|
|
Queue<InstanceHandleReference> queue;
|
|||
|
|
if (!InProgressHandlesPerInstance.TryGetValue(handleRef.InstanceHandle.Id, out queue))
|
|||
|
|
{
|
|||
|
|
queue = new Queue<InstanceHandleReference>(2);
|
|||
|
|
InProgressHandlesPerInstance.Add(handleRef.InstanceHandle.Id, queue);
|
|||
|
|
}
|
|||
|
|
queue.Enqueue(handleRef);
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
InProgressHandles.Enqueue(handleRef);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Must be called with HandlesLock held.
|
|||
|
|
// This is called when a reference becomes the oldest in-progress reference for an instance. This triggers the end of resolution for markers.
|
|||
|
|
// Returns false if the resolution failed, meaning that the marker can be removed.
|
|||
|
|
bool CheckOldestReference(InstanceHandleReference handleRef, ref List<InstanceHandleReference> handlesPendingResolution)
|
|||
|
|
{
|
|||
|
|
LockResolutionMarker marker = handleRef as LockResolutionMarker;
|
|||
|
|
if (marker == null || marker.IsComplete)
|
|||
|
|
{
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool returnValue = true;
|
|||
|
|
try
|
|||
|
|
{
|
|||
|
|
InstanceHandle existingHandle;
|
|||
|
|
if (BoundHandles.TryGetValue(marker.InstanceHandle.Id, out existingHandle))
|
|||
|
|
{
|
|||
|
|
Fx.AssertAndFailFast(!object.ReferenceEquals(existingHandle, marker.InstanceHandle), "InstanceStore lock state is not correct in CheckOldestReference.");
|
|||
|
|
if (existingHandle.Version <= 0 || marker.InstanceVersion <= 0)
|
|||
|
|
{
|
|||
|
|
if (existingHandle.Version != 0 || marker.InstanceVersion != 0)
|
|||
|
|
{
|
|||
|
|
marker.Reason = new InvalidOperationException(SRCore.InvalidLockToken);
|
|||
|
|
returnValue = false;
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
marker.ConflictingHandle = existingHandle;
|
|||
|
|
returnValue = false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else if (existingHandle.Version >= marker.InstanceVersion)
|
|||
|
|
{
|
|||
|
|
marker.ConflictingHandle = existingHandle;
|
|||
|
|
returnValue = false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// No other handles have committed a bind to this or a higher version! We are ok to do so, but it is still not committed, so we stay in queue.
|
|||
|
|
return returnValue;
|
|||
|
|
}
|
|||
|
|
finally
|
|||
|
|
{
|
|||
|
|
marker.NotifyMarkerComplete(returnValue);
|
|||
|
|
|
|||
|
|
if (handlesPendingResolution == null)
|
|||
|
|
{
|
|||
|
|
handlesPendingResolution = new List<InstanceHandleReference>(1);
|
|||
|
|
}
|
|||
|
|
handlesPendingResolution.Add(marker);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Must be called ouside InstanceHandle.ThisLock and HandlesLock.
|
|||
|
|
internal static void ResolveHandles(List<InstanceHandleReference> handlesPendingResolution)
|
|||
|
|
{
|
|||
|
|
if (handlesPendingResolution != null)
|
|||
|
|
{
|
|||
|
|
foreach (InstanceHandleReference handleRef in handlesPendingResolution)
|
|||
|
|
{
|
|||
|
|
LockResolutionMarker marker = handleRef as LockResolutionMarker;
|
|||
|
|
Fx.Assert(marker != null, "How did a non-marker get in here.");
|
|||
|
|
marker.MarkerWaitHandle.Set();
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
class LockResolutionMarker : InstanceHandleReference
|
|||
|
|
{
|
|||
|
|
AsyncWaitHandle waitHandle = new AsyncWaitHandle(EventResetMode.ManualReset);
|
|||
|
|
|
|||
|
|
internal LockResolutionMarker(InstanceHandle instanceHandle, long instanceVersion)
|
|||
|
|
: base(instanceHandle)
|
|||
|
|
{
|
|||
|
|
InstanceVersion = instanceVersion;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// This is signalled when the marker reaches the end of the queue.
|
|||
|
|
internal AsyncWaitHandle MarkerWaitHandle
|
|||
|
|
{
|
|||
|
|
get
|
|||
|
|
{
|
|||
|
|
return this.waitHandle;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// The initial state of the attempt.
|
|||
|
|
internal long InstanceVersion { get; private set; }
|
|||
|
|
|
|||
|
|
// State regarding a failed attempt which can be used to construct an exception.
|
|||
|
|
internal InstanceHandle ConflictingHandle { get; set; }
|
|||
|
|
internal Exception Reason { get; set; }
|
|||
|
|
|
|||
|
|
// State about the success / failure of the attempt.
|
|||
|
|
internal bool IsComplete { get; private set; }
|
|||
|
|
internal bool NonConflicting { get; private set; }
|
|||
|
|
|
|||
|
|
internal void NotifyMarkerComplete(bool success)
|
|||
|
|
{
|
|||
|
|
Fx.Assert(InstanceHandle != null, "NotifyNonConflicting called on a cancelled LockResolutionMarker.");
|
|||
|
|
NonConflicting = success;
|
|||
|
|
IsComplete = true;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|