TransactionCache.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Transactions / TransactionCache.cs / 1 / TransactionCache.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------
namespace System.ServiceModel.Transactions
{ 
    using System;
    using System.Collections.Generic; 
    using System.Diagnostics; 
    using System.ServiceModel;
    using System.ServiceModel.Channels; 
    using System.ServiceModel.Security;
    using System.Threading;
    using System.Transactions;
    using System.Xml; 

    //----------------------------------------------------------------------------------------- 
    //                          Transaction caches 
    //-----------------------------------------------------------------------------------------
    class WsatExtendedInformationCache : TransactionCache 
    {
        public static void Cache(Transaction tx, WsatExtendedInformation info)
        {
            WsatExtendedInformationCache entry = new WsatExtendedInformationCache(); 
            entry.AddEntry(tx, tx, info);
        } 
    } 

    class WsatIncomingTransactionCache : TransactionCache 
    {
        public static void Cache(string identifier, Transaction tx)
        {
            WsatIncomingTransactionCache entry = new WsatIncomingTransactionCache(); 
            entry.AddEntry(tx, identifier, tx);
        } 
    } 

    abstract class TransactionCache 
    {
        static Dictionary cache = new Dictionary();
        static ReaderWriterLock cacheLock = new ReaderWriterLock();
 
        T key;
 
        protected void AddEntry(Transaction transaction, T key, S value) 
        {
            this.key = key; 

            if (Add(key, value))
            {
                transaction.TransactionCompleted += new TransactionCompletedEventHandler(OnTransactionCompleted); 
            }
        } 
 
        void OnTransactionCompleted(object sender, TransactionEventArgs e)
        { 
            Remove(this.key);
        }

        static bool Add(T key, S value) 
        {
            bool lockHeld = false; 
            try 
            {
                try { } 
                finally
                {
                    cacheLock.AcquireWriterLock(Timeout.Infinite);
                    lockHeld = true; 
                }
 
                if (!cache.ContainsKey(key)) 
                {
                    cache.Add(key, value); 
                    return true;
                }
            }
            finally 
            {
                if (lockHeld) 
                { 
                    cacheLock.ReleaseWriterLock();
                } 
            }

            return false;
        } 

        static void Remove(T key) 
        { 
            bool lockHeld = false;
            try 
            {
                try { }
                finally
                { 
                    cacheLock.AcquireWriterLock(Timeout.Infinite);
                    lockHeld = true; 
                } 

                bool remove = cache.Remove(key); 
                if (!(remove))
                {
                    // tx processing requires failfast when state is inconsistent
                    DiagnosticUtility.FailFast("TransactionCache: key must be present in transaction cache"); 
                }
            } 
            finally 
            {
                if (lockHeld) 
                {
                    cacheLock.ReleaseWriterLock();
                }
            } 

        } 
 
        public static bool Find(T key, out S value)
        { 
            bool lockHeld = false;
            try
            {
                try { } 
                finally
                { 
                    cacheLock.AcquireReaderLock(Timeout.Infinite); 
                    lockHeld = true;
                } 

                if (cache.TryGetValue(key, out value))
                {
                    return true; 
                }
            } 
            finally 
            {
                if (lockHeld) 
                {
                    cacheLock.ReleaseReaderLock();
                }
            } 

            return false; 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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TransactionCache.cs source code in C# .NET

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