LogExtentCollection.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 / LogExtentCollection.cs / 1305376 / LogExtentCollection.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace System.IO.Log
{ 
    using System;
    using System.Collections; 
    using System.Collections.Generic; 
    using System.Diagnostics;
    using System.Runtime.InteropServices; 
    using System.Threading;

    using Microsoft.Win32.SafeHandles;
 
    public sealed class LogExtentCollection : IEnumerable
    { 
        LogStore store; 
        int version;
 
        internal LogExtentCollection(LogStore store)
        {
            this.store = store;
        } 

        public int Count 
        { 
            get
            { 
                CLFS_INFORMATION info;
                this.store.GetLogFileInformation(out info);

                return (int)info.TotalContainers; 
            }
        } 
 
        public int FreeCount
        { 
            get
            {
                CLFS_INFORMATION info;
                this.store.GetLogFileInformation(out info); 

                return (int)info.FreeContainers; 
            } 
        }
 
        int Version
        {
            get
            { 
                return this.version;
            } 
        } 

        LogStore Store 
        {
            get
            {
                return this.store; 
            }
        } 
 
        public void Add(string path)
        { 
            if(string.IsNullOrEmpty(path))
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentNull("path"));
            } 
            if (this.Count == 0)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.InvalidOperation(SR.LogStore_SizeRequired)); 
            }
 
            UnsafeNativeMethods.AddLogContainerNoSizeSync(
                this.store.Handle,
                path);
 
            this.version++;
        } 
 
        public void Add(string path, long size)
        { 
            if(string.IsNullOrEmpty(path))
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentNull("path"));
            } 
            if (size <= 0)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentOutOfRange("size")); 
            }
 
            CLFS_INFORMATION info;
            this.store.GetLogFileInformation(out info);
            if ((ulong)size < info.ContainerSize)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentInvalid(SR.LogStore_SizeTooSmall));
            } 
 
            ulong ulSize = (ulong)size;
            UnsafeNativeMethods.AddLogContainerSync( 
                this.store.Handle,
                ref ulSize,
                path);
 
            this.version++;
        } 
 
        IEnumerator IEnumerable.GetEnumerator()
        { 
            return this.GetEnumerator();
        }

        public IEnumerator GetEnumerator() 
        {
            return new LogExtentEnumerator(this); 
        } 

        public void Remove(string path, bool force) 
        {
            if(string.IsNullOrEmpty(path))
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentNull("path")); 
            }
 
            UnsafeNativeMethods.RemoveLogContainerSync( 
                this.store.Handle,
                path, 
                force);

            this.version++;
        } 

        public void Remove(LogExtent extent, bool force) 
        { 
            if(extent == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ArgumentNull("extent"));
            }

            UnsafeNativeMethods.RemoveLogContainerSync( 
                this.store.Handle,
                extent.Path, 
                force); 

            this.version++; 
        }

        class LogExtentEnumerator : IEnumerator
        { 
            LogExtentCollection collection;
            List.Enumerator innerEnum; 
            int version; 

            public LogExtentEnumerator(LogExtentCollection collection) 
            {
                this.collection = collection;
                this.version = this.collection.Version;
 
                SafeFileHandle logHandle = this.collection.Store.Handle;
 
                CLFS_SCAN_CONTEXT scanContext = new CLFS_SCAN_CONTEXT(); 
                try
                { 
                    List extents = new List();

                    CLFS_INFORMATION logInfo;
                    this.collection.Store.GetLogFileInformation(out logInfo); 
                    if (logInfo.TotalContainers > 0)
                    { 
                        UnsafeNativeMethods.CreateLogContainerScanContextSync( 
                            logHandle,
                            0, 
                            logInfo.TotalContainers,
                            CLFS_SCAN_MODE.CLFS_SCAN_FORWARD,
                            ref scanContext);
 
                        long containerPointer = scanContext.pinfoContainer.ToInt64();
 
                        CLFS_CONTAINER_INFORMATION_WRAPPER info; 
                        info = new CLFS_CONTAINER_INFORMATION_WRAPPER();
 
                        int infoSize;
                        infoSize = Marshal.SizeOf(typeof(CLFS_CONTAINER_INFORMATION_WRAPPER));

                        for (uint i = 0; i < scanContext.cContainersReturned; i++) 
                        {
                            Marshal.PtrToStructure(new IntPtr(containerPointer), 
                                                   info); 

                            LogExtent extent = new LogExtent( 
                                info.info.GetActualFileName(logHandle),
                                info.info.FileSize,
                                (LogExtentState)info.info.State);
                            extents.Add(extent); 

                            containerPointer += infoSize; 
                        } 
                    }
 
                    this.innerEnum = extents.GetEnumerator();
                }
                finally
                { 
                    if ((scanContext.eScanMode & CLFS_SCAN_MODE.CLFS_SCAN_INITIALIZED) != 0)
                    { 
                        UnsafeNativeMethods.ScanLogContainersSyncClose( 
                            ref scanContext);
                    } 
                }
            }

            object IEnumerator.Current 
            {
                get 
                { 
                    return this.Current;
                } 
            }

            public LogExtent Current
            { 
                get { return this.innerEnum.Current; }
            } 
 
            public bool MoveNext()
            { 
                if (this.version != this.collection.Version)
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
                                    Error.InvalidOperation(SR.InvalidOperation_EnumFailedVersion)); 
                }
 
                return this.innerEnum.MoveNext(); 
            }
 
            public void Dispose()
            {
                this.innerEnum.Dispose();
            } 

            public void Reset() 
            { 
                ((IEnumerator)this.innerEnum).Reset();
                this.version = this.collection.Version; 
            }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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