Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities.DurableInstancing / System / Activities / DurableInstancing / SqlWorkflowInstanceStoreLock.cs / 1305376 / SqlWorkflowInstanceStoreLock.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.Activities.DurableInstancing { using System; using System.Collections.Generic; using System.Linq; using System.Runtime; using System.Runtime.DurableInstancing; using System.Threading; class SqlWorkflowInstanceStoreLock { bool isBeingModified; Guid lockOwnerId; SqlWorkflowInstanceStore sqlWorkflowInstanceStore; WeakReference lockOwnerInstanceHandle; object thisLock; public SqlWorkflowInstanceStoreLock(SqlWorkflowInstanceStore sqlWorkflowInstanceStore) { this.sqlWorkflowInstanceStore = sqlWorkflowInstanceStore; this.thisLock = new object(); this.SurrogateLockOwnerId = -1; } public PersistenceTask InstanceDetectionTask { get; set; } public bool IsValid { get { return IsLockOwnerValid(this.SurrogateLockOwnerId); } } public bool IsLockOwnerValid(long surrogateLockOwnerId) { return (this.SurrogateLockOwnerId != -1) && (surrogateLockOwnerId == this.SurrogateLockOwnerId) && (this.sqlWorkflowInstanceStore.InstanceOwnersExist); } public Guid LockOwnerId { get { return this.lockOwnerId; } } public PersistenceTask LockRecoveryTask { get; set; } public PersistenceTask LockRenewalTask { get; set; } public long SurrogateLockOwnerId { get; private set; } object ThisLock { get { return this.thisLock; } } public void MarkInstanceOwnerCreated(Guid lockOwnerId, long surrogateLockOwnerId, InstanceHandle lockOwnerInstanceHandle, bool detectRunnableInstances, bool detectActivatableInstances) { Fx.Assert(this.isBeingModified, "Must have modification lock to mark owner as created"); this.lockOwnerId = lockOwnerId; this.SurrogateLockOwnerId = surrogateLockOwnerId; this.lockOwnerInstanceHandle = new WeakReference(lockOwnerInstanceHandle); TimeSpan hostLockRenewalPeriod = this.sqlWorkflowInstanceStore.HostLockRenewalPeriod; TimeSpan runnableInstancesDetectionPeriod = this.sqlWorkflowInstanceStore.RunnableInstancesDetectionPeriod; if (detectActivatableInstances) { this.InstanceDetectionTask = new DetectActivatableWorkflowsTask(this.sqlWorkflowInstanceStore, this, runnableInstancesDetectionPeriod); } else if (detectRunnableInstances) { this.InstanceDetectionTask = new DetectRunnableInstancesTask(this.sqlWorkflowInstanceStore, this, runnableInstancesDetectionPeriod); } this.LockRenewalTask = new LockRenewalTask(this.sqlWorkflowInstanceStore, this, hostLockRenewalPeriod); this.LockRecoveryTask = new LockRecoveryTask(this.sqlWorkflowInstanceStore, this, hostLockRenewalPeriod); if (this.InstanceDetectionTask != null) { this.InstanceDetectionTask.ResetTimer(true); } this.LockRenewalTask.ResetTimer(true); this.LockRecoveryTask.ResetTimer(true); } public void MarkInstanceOwnerLost(long surrogateLockOwnerId, bool hasModificationLock) { if (hasModificationLock) { this.MarkInstanceOwnerLost(surrogateLockOwnerId); } else { this.TakeModificationLock(); this.MarkInstanceOwnerLost(surrogateLockOwnerId); this.ReturnModificationLock(); } } public void ReturnModificationLock() { Fx.Assert(this.isBeingModified, "Must have modification lock to release it!"); bool lockTaken = false; while (true) { Monitor.Enter(ThisLock, ref lockTaken); if (lockTaken) { this.isBeingModified = false; Monitor.Pulse(ThisLock); Monitor.Exit(ThisLock); return; } } } public void TakeModificationLock() { bool lockTaken = false; while (true) { Monitor.Enter(ThisLock, ref lockTaken); if (lockTaken) { while (this.isBeingModified) { Monitor.Wait(ThisLock); } this.isBeingModified = true; Monitor.Exit(ThisLock); return; } } } void MarkInstanceOwnerLost(long surrogateLockOwnerId) { Fx.Assert(this.isBeingModified, "Must have modification lock to mark owner as lost"); if (this.SurrogateLockOwnerId == surrogateLockOwnerId) { this.SurrogateLockOwnerId = -1; InstanceHandle instanceHandle = this.lockOwnerInstanceHandle.Target as InstanceHandle; if (instanceHandle != null) { instanceHandle.Free(); } if (this.sqlWorkflowInstanceStore.IsLockRetryEnabled()) { this.sqlWorkflowInstanceStore.LoadRetryHandler.AbortPendingRetries(); } if (this.LockRenewalTask != null) { this.LockRenewalTask.CancelTimer(); } if (this.LockRecoveryTask != null) { this.LockRecoveryTask.CancelTimer(); } if (this.InstanceDetectionTask != null) { this.InstanceDetectionTask.CancelTimer(); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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