LogPolicy.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / Log / System / IO / Log / LogPolicy.cs / 1305376 / LogPolicy.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace System.IO.Log
{ 
    public sealed class LogPolicy
    { 
        [Flags] 
        enum ModifiedFields
        { 
            None                 = 0x00,
            MinimumExtentCount   = 0x01,
            MaximumExtentCount   = 0x02,
            GrowthRate           = 0x04, 
            PinnedTailThreshold  = 0x08,
            AutoShrinkPercentage = 0x10, 
            NewExtentPrefix      = 0x20, 
            NextExtentSuffix     = 0x40,
            AutoGrow             = 0x80, 
        }

        LogStore       store;
        ModifiedFields modifiedFields; 

        int minimumExtentCount; 
        int maximumExtentCount; 
        PolicyUnit growthRate;
        PolicyUnit pinnedTailThreshold; 
        int autoShrinkPercentage;
        string newExtentPrefix;
        long nextExtentSuffix;
        bool autoGrow; 

        internal LogPolicy(LogStore logStore) 
        { 
            this.store = logStore;
            Refresh(); 
        }

        public bool AutoGrow
        { 
            get { return this.autoGrow; }
            set 
            { 
                this.autoGrow = value;
                this.modifiedFields |= ModifiedFields.AutoGrow; 
            }
        }

        public int MinimumExtentCount 
        {
            get { return this.minimumExtentCount; } 
            set 
            {
                if (value < 2) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentOutOfRange("value"));

                this.minimumExtentCount = value;
                this.modifiedFields |= ModifiedFields.MinimumExtentCount; 
            }
        } 
 
        public int MaximumExtentCount
        { 
            get { return this.maximumExtentCount; }
            set
            {
                if (value < 2) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentOutOfRange("value"));
 
                this.maximumExtentCount = value; 
                this.modifiedFields |= ModifiedFields.MaximumExtentCount;
            } 
        }

        public PolicyUnit GrowthRate
        { 
            get { return this.growthRate; }
            set 
            { 
                this.growthRate = value;
                this.modifiedFields |= ModifiedFields.GrowthRate; 
            }
        }

        public PolicyUnit PinnedTailThreshold 
        {
            get { return this.pinnedTailThreshold; } 
            set 
            {
                this.pinnedTailThreshold = value; 
                this.modifiedFields |= ModifiedFields.PinnedTailThreshold;
            }
        }
 
        public int AutoShrinkPercentage
        { 
            get { return this.autoShrinkPercentage; } 
            set
            { 
                if ((value < 0) || (value > 100))
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentOutOfRange("value"));

                this.autoShrinkPercentage = value; 
                this.modifiedFields |= ModifiedFields.AutoShrinkPercentage;
            } 
        } 

        public string NewExtentPrefix 
        {
            get { return this.newExtentPrefix; }
            set
            { 
#pragma warning suppress 56507
                if (value == null) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentNull("value")); 
#pragma warning suppress 56507
                if ((value.Length == 0) || (value.Length > Const.MAX_PATH)) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentOutOfRange("value"));

                this.newExtentPrefix = value;
                this.modifiedFields |= ModifiedFields.NewExtentPrefix; 
            }
        } 
 
        public long NextExtentSuffix
        { 
            get { return this.nextExtentSuffix; }
            set
            {
                if (value < 0) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentOutOfRange("value"));
 
                this.nextExtentSuffix = value; 
                this.modifiedFields |= ModifiedFields.NextExtentSuffix;
            } 
        }

        public void Commit()
        { 
            CommitMaximumSize();
            CommitMinimumSize(); 
            CommitGrowthRate(); 
            CommitPinnedTailThreshold();
            CommitAutoShrinkPercentage(); 
            CommitAutoGrow();
            CommitNewExtentPrefix();
            CommitNextExtentSuffix();
        } 

        public void Refresh() 
        { 
            RefreshMaximumSize();
            RefreshMinimumSize(); 
            RefreshGrowthRate();
            RefreshPinnedTailThreshold();
            RefreshAutoShrinkPercentage();
            RefreshAutoGrow(); 
            RefreshNewExtentPrefix();
            RefreshNextExtentSuffix(); 
        } 

        void CommitAutoGrow() 
        {
            if (0 != (this.modifiedFields & ModifiedFields.AutoGrow))
            {
                CLFS_MGMT_POLICY_AUTOGROW policy; 
                policy = new CLFS_MGMT_POLICY_AUTOGROW(
                    Const.LOG_POLICY_OVERWRITE | Const.LOG_POLICY_PERSIST); 
                policy.Enabled = (uint)(this.autoGrow ? 1 : 0); 

                UnsafeNativeMethods.InstallLogPolicy(this.store.Handle, 
                                                     ref policy);
                this.modifiedFields &= ~ModifiedFields.AutoGrow;
            }
        } 

        void CommitMaximumSize() 
        { 
            if (0 != (this.modifiedFields & ModifiedFields.MaximumExtentCount))
            { 
                CLFS_MGMT_POLICY_MAXIMUMSIZE policy;
                policy = new CLFS_MGMT_POLICY_MAXIMUMSIZE(
                    Const.LOG_POLICY_OVERWRITE | Const.LOG_POLICY_PERSIST);
                policy.Containers = (uint)this.maximumExtentCount; 

                UnsafeNativeMethods.InstallLogPolicy(this.store.Handle, 
                                                     ref policy); 
                this.modifiedFields &= ~ModifiedFields.MaximumExtentCount;
            } 
        }

        void CommitMinimumSize()
        { 
            if (0 != (this.modifiedFields & ModifiedFields.MinimumExtentCount))
            { 
                CLFS_MGMT_POLICY_MINIMUMSIZE policy; 
                policy = new CLFS_MGMT_POLICY_MINIMUMSIZE(
                    Const.LOG_POLICY_OVERWRITE | Const.LOG_POLICY_PERSIST); 
                policy.Containers = (uint)this.minimumExtentCount;

                UnsafeNativeMethods.InstallLogPolicy(this.store.Handle,
                                                     ref policy); 
                this.modifiedFields &= ~ModifiedFields.MinimumExtentCount;
            } 
        } 

        void CommitGrowthRate() 
        {
            if (0 != (this.modifiedFields & ModifiedFields.GrowthRate))
            {
                CLFS_MGMT_POLICY_GROWTHRATE policy; 
                policy = new CLFS_MGMT_POLICY_GROWTHRATE(
                    Const.LOG_POLICY_OVERWRITE | Const.LOG_POLICY_PERSIST); 
 
                if (this.growthRate.Type == PolicyUnitType.Extents)
                { 
                    policy.AbsoluteGrowthInContainers = (uint)this.growthRate.Value;
                    policy.RelativeGrowthPercentage = 0;
                }
                else 
                {
                    policy.RelativeGrowthPercentage = (uint)this.growthRate.Value; 
                    policy.AbsoluteGrowthInContainers = 0; 
                }
 
                UnsafeNativeMethods.InstallLogPolicy(this.store.Handle,
                                                     ref policy);
                this.modifiedFields &= ~ModifiedFields.GrowthRate;
            } 
        }
 
        void CommitPinnedTailThreshold() 
        {
            if (0 != (this.modifiedFields & ModifiedFields.PinnedTailThreshold)) 
            {
                CLFS_MGMT_POLICY_LOGTAIL policy;
                policy = new CLFS_MGMT_POLICY_LOGTAIL(
                    Const.LOG_POLICY_OVERWRITE | Const.LOG_POLICY_PERSIST); 

                if (this.pinnedTailThreshold.Type == PolicyUnitType.Extents) 
                { 
                    policy.MinimumAvailableContainers = (uint)this.pinnedTailThreshold.Value;
                    policy.MinimumAvailablePercentage = 0; 
                }
                else
                {
                    policy.MinimumAvailablePercentage = (uint)this.pinnedTailThreshold.Value; 
                    policy.MinimumAvailableContainers = 0;
                } 
 
                UnsafeNativeMethods.InstallLogPolicy(this.store.Handle,
                                                     ref policy); 
                this.modifiedFields &= ~ModifiedFields.PinnedTailThreshold;
            }
        }
 
        void CommitAutoShrinkPercentage()
        { 
            if (0 != (this.modifiedFields & ModifiedFields.AutoShrinkPercentage)) 
            {
                CLFS_MGMT_POLICY_AUTOSHRINK policy; 
                policy = new CLFS_MGMT_POLICY_AUTOSHRINK(
                    Const.LOG_POLICY_OVERWRITE | Const.LOG_POLICY_PERSIST);
                policy.Percentage = (uint)this.autoShrinkPercentage;
 
                UnsafeNativeMethods.InstallLogPolicy(this.store.Handle,
                                                     ref policy); 
                this.modifiedFields &= ~ModifiedFields.AutoShrinkPercentage; 
            }
        } 

        void CommitNewExtentPrefix()
        {
            if (0 != (this.modifiedFields & ModifiedFields.NewExtentPrefix)) 
            {
                CLFS_MGMT_POLICY_NEWCONTAINERPREFIX policy; 
                policy = new CLFS_MGMT_POLICY_NEWCONTAINERPREFIX( 
                    Const.LOG_POLICY_OVERWRITE | Const.LOG_POLICY_PERSIST);
 
                // The prefix length should not include the NULL terminator.
                // Including NULL terminator will cause the CLFS container
                // name to have embedded NULL and container creation will fail.
                policy.PrefixLengthInBytes = (ushort)((this.newExtentPrefix.Length) * 2); 
                policy.PrefixString = this.newExtentPrefix;
 
                UnsafeNativeMethods.InstallLogPolicy(this.store.Handle, 
                                                     ref policy);
                this.modifiedFields &= ~ModifiedFields.NewExtentPrefix; 
            }
        }

        void CommitNextExtentSuffix() 
        {
            if (0 != (this.modifiedFields & ModifiedFields.NextExtentSuffix)) 
            { 
                CLFS_MGMT_POLICY_NEXTCONTAINERSUFFIX policy;
                policy = new CLFS_MGMT_POLICY_NEXTCONTAINERSUFFIX( 
                    Const.LOG_POLICY_OVERWRITE | Const.LOG_POLICY_PERSIST);
                policy.NextContainerSuffix = (ulong)this.nextExtentSuffix;

                UnsafeNativeMethods.InstallLogPolicy(this.store.Handle, 
                                                     ref policy);
                this.modifiedFields &= ~ModifiedFields.NextExtentSuffix; 
            } 
        }
 
        void RefreshAutoGrow()
        {
            CLFS_MGMT_POLICY_AUTOGROW policy;
            UnsafeNativeMethods.QueryLogPolicy(this.store.Handle, out policy); 

            this.autoGrow = (policy.Enabled != 0); 
            this.modifiedFields &= ~ModifiedFields.AutoGrow; 
        }
 
        void RefreshMaximumSize()
        {
            CLFS_MGMT_POLICY_MAXIMUMSIZE policy;
            UnsafeNativeMethods.QueryLogPolicy(this.store.Handle, out policy); 

            this.maximumExtentCount = (int)policy.Containers; 
            this.modifiedFields &= ~ModifiedFields.MaximumExtentCount; 
        }
 
        void RefreshMinimumSize()
        {
            CLFS_MGMT_POLICY_MINIMUMSIZE policy;
            UnsafeNativeMethods.QueryLogPolicy(this.store.Handle, out policy); 

            this.minimumExtentCount = (int)policy.Containers; 
            this.modifiedFields &= ~ModifiedFields.MinimumExtentCount; 
        }
 
        void RefreshGrowthRate()
        {
            CLFS_MGMT_POLICY_GROWTHRATE policy;
            UnsafeNativeMethods.QueryLogPolicy(this.store.Handle, out policy); 

            if (policy.AbsoluteGrowthInContainers != 0) 
            { 
                this.growthRate = PolicyUnit.Extents(
                    (int)policy.AbsoluteGrowthInContainers); 
            }
            else
            {
                this.growthRate = PolicyUnit.Percentage( 
                    (int)policy.RelativeGrowthPercentage);
            } 
            this.modifiedFields &= ~ModifiedFields.GrowthRate; 
        }
 
        void RefreshPinnedTailThreshold()
        {
            CLFS_MGMT_POLICY_LOGTAIL policy;
            UnsafeNativeMethods.QueryLogPolicy(this.store.Handle, out policy); 

            if (policy.MinimumAvailablePercentage != 0) 
            { 
                this.pinnedTailThreshold = PolicyUnit.Percentage(
                    (int)policy.MinimumAvailablePercentage); 
            }
            else
            {
                this.pinnedTailThreshold = PolicyUnit.Extents( 
                    (int)policy.MinimumAvailableContainers);
            } 
            this.modifiedFields &= ~ModifiedFields.PinnedTailThreshold; 
        }
 
        void RefreshAutoShrinkPercentage()
        {
            CLFS_MGMT_POLICY_AUTOSHRINK policy;
            UnsafeNativeMethods.QueryLogPolicy(this.store.Handle, out policy); 

            this.autoShrinkPercentage = (int)policy.Percentage; 
            this.modifiedFields &= ~ModifiedFields.AutoShrinkPercentage; 
        }
 
        void RefreshNewExtentPrefix()
        {
            CLFS_MGMT_POLICY_NEWCONTAINERPREFIX policy;
 
            UnsafeNativeMethods.QueryLogPolicy(this.store.Handle, out policy);
 
            this.newExtentPrefix = policy.PrefixString; 
            this.modifiedFields &= ~ModifiedFields.NewExtentPrefix;
        } 

        void RefreshNextExtentSuffix()
        {
            CLFS_MGMT_POLICY_NEXTCONTAINERSUFFIX policy; 
            UnsafeNativeMethods.QueryLogPolicy(this.store.Handle, out policy);
 
            this.nextExtentSuffix = (long)policy.NextContainerSuffix; 
            this.modifiedFields &= ~ModifiedFields.NextExtentSuffix;
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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LogPolicy.cs source code in C# .NET

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