SqlStatistics.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / SqlClient / SqlStatistics.cs / 1 / SqlStatistics.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 

using System; 
using System.Collections;
using System.Data.Common;
using System.Diagnostics;
 

namespace System.Data.SqlClient 
{ 
    internal sealed class SqlStatistics {
 
        static internal SqlStatistics StartTimer(SqlStatistics statistics) {
            if ((null != statistics) && !statistics.RequestExecutionTimer()) {
                // we're re-entrant -- don't bother.
                statistics = null; 
            }
            return statistics; 
        } 

        static internal void StopTimer(SqlStatistics statistics) { 
            if (null != statistics) {
                statistics.ReleaseAndUpdateExecutionTimer();
            }
        } 

        // internal values that are not exposed through properties 
        internal long _closeTimestamp; 
        internal long _openTimestamp;
        internal long _startExecutionTimestamp; 
        internal long _startFetchTimestamp;
        internal long _startNetworkServerTimestamp;

        // internal values that are exposed through properties 
        internal long _buffersReceived;
        internal long _buffersSent; 
        internal long _bytesReceived; 
        internal long _bytesSent;
        internal long _connectionTime; 
        internal long _cursorOpens;
        internal long _executionTime;
        internal long _iduCount;
        internal long _iduRows; 
        internal long _networkServerTime;
        internal long _preparedExecs; 
        internal long _prepares; 
        internal long _selectCount;
        internal long _selectRows; 
        internal long _serverRoundtrips;
        internal long _sumResultSets;
        internal long _transactions;
        internal long _unpreparedExecs; 

        // these flags are required if statistics is turned on/off in the middle of command execution 
        private bool _waitForDoneAfterRow; 
        private bool _waitForReply;
 

        internal bool WaitForDoneAfterRow {
            get {
                return _waitForDoneAfterRow; 
            }
            set { 
                _waitForDoneAfterRow = value; 
            }
        } 

        internal bool WaitForReply {
            get {
                return _waitForReply; 
            }
        } 
 
        internal SqlStatistics () {
        } 

        internal void ContinueOnNewConnection() {
            _startExecutionTimestamp = 0;
            _startFetchTimestamp = 0; 
            _waitForDoneAfterRow = false;
            _waitForReply = false; 
        } 

        internal IDictionary GetHashtable() { 
            Hashtable ht = new Hashtable();

            ht.Add("BuffersReceived", _buffersReceived);
            ht.Add("BuffersSent", _buffersSent); 
            ht.Add("BytesReceived", _bytesReceived);
            ht.Add("BytesSent", _bytesSent); 
            ht.Add("CursorOpens", _cursorOpens); 
            ht.Add("IduCount", _iduCount);
            ht.Add("IduRows", _iduRows); 
            ht.Add("PreparedExecs", _preparedExecs);
            ht.Add("Prepares", _prepares);
            ht.Add("SelectCount", _selectCount);
            ht.Add("SelectRows", _selectRows); 
            ht.Add("ServerRoundtrips", _serverRoundtrips);
            ht.Add("SumResultSets", _sumResultSets); 
            ht.Add("Transactions", _transactions); 
            ht.Add("UnpreparedExecs", _unpreparedExecs);
 
            ht.Add ("ConnectionTime", ADP.TimerToMilliseconds(_connectionTime));
            ht.Add ("ExecutionTime", ADP.TimerToMilliseconds(_executionTime));
            ht.Add ("NetworkServerTime", ADP.TimerToMilliseconds(_networkServerTime));
 
            return ht;
        } 
 
        internal bool RequestExecutionTimer () {
            if (_startExecutionTimestamp == 0) { 
                ADP.TimerCurrent(out _startExecutionTimestamp);
                return true;
            }
            return false; 
        }
 
        internal void RequestNetworkServerTimer () { 
            Debug.Assert(_startExecutionTimestamp!=0, "No network time expected outside execution period");
            if (_startNetworkServerTimestamp == 0) { 
                ADP.TimerCurrent(out _startNetworkServerTimestamp);
            }
            _waitForReply = true;
        } 

        internal void ReleaseAndUpdateExecutionTimer () { 
            long stopExecutionTimestamp; 

            if (_startExecutionTimestamp > 0) { 
                ADP.TimerCurrent(out stopExecutionTimestamp);
                _executionTime += (stopExecutionTimestamp - _startExecutionTimestamp);
                _startExecutionTimestamp = 0;
            } 
        }
 
        internal void ReleaseAndUpdateNetworkServerTimer () { 
            long stopNetworkServerTimestamp;
 
            if (_waitForReply && _startNetworkServerTimestamp > 0) {
                ADP.TimerCurrent(out stopNetworkServerTimestamp);
                _networkServerTime += (stopNetworkServerTimestamp - _startNetworkServerTimestamp);
                _startNetworkServerTimestamp = 0; 
            }
            _waitForReply = false; 
        } 

        internal void Reset() { 
            _buffersReceived = 0;
            _buffersSent = 0;
            _bytesReceived = 0;
            _bytesSent = 0; 
            _connectionTime = 0;
            _cursorOpens = 0; 
            _executionTime = 0; 
            _iduCount = 0;
            _iduRows = 0; 
            _networkServerTime = 0;
            _preparedExecs = 0;
            _prepares = 0;
            _selectCount = 0; 
            _selectRows = 0;
            _serverRoundtrips = 0; 
            _sumResultSets = 0; 
            _transactions = 0;
            _unpreparedExecs = 0; 
            _waitForDoneAfterRow = false;
            _waitForReply = false;
            _startExecutionTimestamp = 0;
            _startNetworkServerTimestamp = 0; 
        }
 
        internal void SafeAdd (ref long value, long summand) { 
            if (long.MaxValue - value > summand) {
                value += summand; 
            }
            else {
                value = long.MaxValue;
            } 
        }
 
        internal long SafeIncrement(ref long value) { 
            if (value < long.MaxValue) value++;
            return value; 
        }

        internal void UpdateStatistics() {
            // update connection time 
            if (_closeTimestamp >= _openTimestamp) {
                SafeAdd(ref _connectionTime, _closeTimestamp - _openTimestamp); 
            } 
            else {
                _connectionTime = long.MaxValue; 
            }
        }
    }
} 


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

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