mirror of
https://github.com/gnh1201/welsonjs.git
synced 2025-10-31 04:51:17 +00:00
Namhyeon, Go
9d2fb432f7
Add the package ManagedEsent (microsoft/ManagedEsent@d358c07), and WelsonJS.Esent
392 lines
14 KiB
C#
392 lines
14 KiB
C#
//-----------------------------------------------------------------------
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// <copyright file="jet_threadstats.cs" company="Microsoft Corporation">
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// Copyright (c) Microsoft Corporation.
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// </copyright>
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//-----------------------------------------------------------------------
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namespace Microsoft.Isam.Esent.Interop.Vista
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{
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using System;
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using System.Diagnostics;
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using System.Diagnostics.CodeAnalysis;
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using System.Globalization;
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using System.Runtime.InteropServices;
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/// <summary>
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/// Contains cumulative statistics on the work performed by the database
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/// engine on the current thread. This information is returned via
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/// JetGetThreadStats.
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/// </summary>
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[StructLayout(LayoutKind.Sequential)]
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[SuppressMessage(
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"Microsoft.StyleCop.CSharp.NamingRules",
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"SA1300:ElementMustBeginWithUpperCaseLetter",
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Justification = "This should match the unmanaged API, which isn't capitalized.")]
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[Serializable]
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[SuppressMessage("Microsoft.StyleCop.CSharp.NamingRules",
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"SA1305:FieldNamesMustNotUseHungarianNotation",
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Justification = "This should match the unmanaged API, which isn't capitalized.")]
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public struct JET_THREADSTATS : IEquatable<JET_THREADSTATS>
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{
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/// <summary>
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/// The size of a JET_THREADSTATS structure.
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/// </summary>
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internal static readonly int Size = Marshal.SizeOf(typeof(JET_THREADSTATS));
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/// <summary>
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/// Size of the structure. This is used for interop.
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/// </summary>
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private readonly int cbStruct;
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/// <summary>
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/// Number of pages visited.
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/// </summary>
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private int pagesReferenced;
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/// <summary>
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/// Number of pages read from disk.
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/// </summary>
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private int pagesRead;
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/// <summary>
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/// Number of pages preread.
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/// </summary>
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private int pagesPreread;
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/// <summary>
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/// Number of pages dirtied.
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/// </summary>
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private int pagesDirtied;
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/// <summary>
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/// Pages redirtied.
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/// </summary>
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private int pagesRedirtied;
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/// <summary>
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/// Number of log records generated.
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/// </summary>
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private int numLogRecords;
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/// <summary>
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/// Number of bytes logged.
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/// </summary>
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private int loggedBytes;
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/// <summary>
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/// Gets the total number of database pages visited by the database
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/// engine on the current thread.
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/// </summary>
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public int cPageReferenced
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{
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[DebuggerStepThrough]
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get { return this.pagesReferenced; }
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internal set { this.pagesReferenced = value; }
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}
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/// <summary>
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/// Gets the total number of database pages fetched from disk by the
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/// database engine on the current thread.
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/// </summary>
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public int cPageRead
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{
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[DebuggerStepThrough]
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get { return this.pagesRead; }
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internal set { this.pagesRead = value; }
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}
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/// <summary>
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/// Gets the total number of database pages prefetched from disk by
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/// the database engine on the current thread.
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/// </summary>
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public int cPagePreread
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{
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[DebuggerStepThrough]
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get { return this.pagesPreread; }
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internal set { this.pagesPreread = value; }
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}
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/// <summary>
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/// Gets the total number of database pages, with no unwritten changes,
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/// that have been modified by the database engine on the current thread.
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/// </summary>
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public int cPageDirtied
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{
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[DebuggerStepThrough]
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get { return this.pagesDirtied; }
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internal set { this.pagesDirtied = value; }
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}
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/// <summary>
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/// Gets the total number of database pages, with unwritten changes, that
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/// have been modified by the database engine on the current thread.
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/// </summary>
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public int cPageRedirtied
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{
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[DebuggerStepThrough]
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get { return this.pagesRedirtied; }
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internal set { this.pagesRedirtied = value; }
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}
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/// <summary>
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/// Gets the total number of transaction log records that have been
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/// generated by the database engine on the current thread.
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/// </summary>
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public int cLogRecord
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{
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[DebuggerStepThrough]
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get { return this.numLogRecords; }
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internal set { this.numLogRecords = value; }
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}
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/// <summary>
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/// Gets the total size, in bytes, of transaction log records that
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/// have been generated by the database engine on the current thread.
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/// </summary>
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public int cbLogRecord
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{
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[DebuggerStepThrough]
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get { return this.loggedBytes; }
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internal set { this.loggedBytes = value; }
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}
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/// <summary>
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/// Create a new <see cref="JET_THREADSTATS"/> struct with the specified
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/// valued.
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/// </summary>
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/// <param name="cPageReferenced">
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/// Number of pages visited.
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/// </param>
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/// <param name="cPageRead">
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/// Number of pages read.
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/// </param>
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/// <param name="cPagePreread">
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/// Number of pages preread.
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/// </param>
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/// <param name="cPageDirtied">
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/// TNumber of pages dirtied.
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/// </param>
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/// <param name="cPageRedirtied">
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/// Number of pages redirtied.
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/// </param>
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/// <param name="cLogRecord">
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/// Number of log records generated.
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/// </param>
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/// <param name="cbLogRecord">
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/// Bytes of log records written.
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/// </param>
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/// <returns>
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/// A new <see cref="JET_THREADSTATS"/> struct with the specified values.
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/// </returns>
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public static JET_THREADSTATS Create(
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int cPageReferenced,
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int cPageRead,
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int cPagePreread,
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int cPageDirtied,
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int cPageRedirtied,
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int cLogRecord,
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int cbLogRecord)
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{
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return new JET_THREADSTATS
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{
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cPageReferenced = cPageReferenced,
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cPageRead = cPageRead,
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cPagePreread = cPagePreread,
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cPageDirtied = cPageDirtied,
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cPageRedirtied = cPageRedirtied,
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cLogRecord = cLogRecord,
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cbLogRecord = cbLogRecord,
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};
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}
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/// <summary>
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/// Add the stats in two JET_THREADSTATS structures.
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/// </summary>
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/// <param name="t1">The first JET_THREADSTATS.</param>
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/// <param name="t2">The second JET_THREADSTATS.</param>
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/// <returns>A JET_THREADSTATS containing the result of adding the stats in t1 and t2.</returns>
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public static JET_THREADSTATS Add(JET_THREADSTATS t1, JET_THREADSTATS t2)
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{
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unchecked
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{
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return new JET_THREADSTATS
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{
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cPageReferenced = t1.cPageReferenced + t2.cPageReferenced,
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cPageRead = t1.cPageRead + t2.cPageRead,
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cPagePreread = t1.cPagePreread + t2.cPagePreread,
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cPageDirtied = t1.cPageDirtied + t2.cPageDirtied,
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cPageRedirtied = t1.cPageRedirtied + t2.cPageRedirtied,
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cLogRecord = t1.cLogRecord + t2.cLogRecord,
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cbLogRecord = t1.cbLogRecord + t2.cbLogRecord,
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};
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}
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}
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/// <summary>
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/// Add the stats in two JET_THREADSTATS structures.
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/// </summary>
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/// <param name="t1">The first JET_THREADSTATS.</param>
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/// <param name="t2">The second JET_THREADSTATS.</param>
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/// <returns>A JET_THREADSTATS containing the result of adding the stats in t1 and t2.</returns>
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public static JET_THREADSTATS operator +(JET_THREADSTATS t1, JET_THREADSTATS t2)
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{
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return Add(t1, t2);
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}
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/// <summary>
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/// Calculate the difference in stats between two JET_THREADSTATS structures.
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/// </summary>
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/// <param name="t1">The first JET_THREADSTATS.</param>
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/// <param name="t2">The second JET_THREADSTATS.</param>
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/// <returns>A JET_THREADSTATS containing the difference in stats between t1 and t2.</returns>
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public static JET_THREADSTATS Subtract(JET_THREADSTATS t1, JET_THREADSTATS t2)
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{
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unchecked
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{
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return new JET_THREADSTATS
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{
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cPageReferenced = t1.cPageReferenced - t2.cPageReferenced,
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cPageRead = t1.cPageRead - t2.cPageRead,
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cPagePreread = t1.cPagePreread - t2.cPagePreread,
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cPageDirtied = t1.cPageDirtied - t2.cPageDirtied,
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cPageRedirtied = t1.cPageRedirtied - t2.cPageRedirtied,
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cLogRecord = t1.cLogRecord - t2.cLogRecord,
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cbLogRecord = t1.cbLogRecord - t2.cbLogRecord,
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};
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}
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}
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/// <summary>
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/// Calculate the difference in stats between two JET_THREADSTATS structures.
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/// </summary>
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/// <param name="t1">The first JET_THREADSTATS.</param>
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/// <param name="t2">The second JET_THREADSTATS.</param>
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/// <returns>A JET_THREADSTATS containing the difference in stats between t1 and t2.</returns>
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public static JET_THREADSTATS operator -(JET_THREADSTATS t1, JET_THREADSTATS t2)
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{
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return Subtract(t1, t2);
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}
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/// <summary>
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/// Determines whether two specified instances of JET_THREADSTATS
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/// are equal.
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/// </summary>
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/// <param name="lhs">The first instance to compare.</param>
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/// <param name="rhs">The second instance to compare.</param>
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/// <returns>True if the two instances are equal.</returns>
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public static bool operator ==(JET_THREADSTATS lhs, JET_THREADSTATS rhs)
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{
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return lhs.Equals(rhs);
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}
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/// <summary>
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/// Determines whether two specified instances of JET_THREADSTATS
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/// are not equal.
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/// </summary>
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/// <param name="lhs">The first instance to compare.</param>
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/// <param name="rhs">The second instance to compare.</param>
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/// <returns>True if the two instances are not equal.</returns>
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public static bool operator !=(JET_THREADSTATS lhs, JET_THREADSTATS rhs)
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{
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return !(lhs == rhs);
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}
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/// <summary>
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/// Gets a string representation of this object.
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/// </summary>
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/// <returns>A string representation of this object.</returns>
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public override string ToString()
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{
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// String.Concat is faster than using a StringBuilder.
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// use Int32.ToString instead of passing the Int32 to
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// String.Format (which requires boxing).
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return string.Concat(
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this.cPageReferenced.ToString("N0", CultureInfo.InvariantCulture),
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" page reference",
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GetPluralS(this.cPageReferenced),
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", ",
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this.cPageRead.ToString("N0", CultureInfo.InvariantCulture),
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" page",
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GetPluralS(this.cPageRead),
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" read, ",
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this.cPagePreread.ToString("N0", CultureInfo.InvariantCulture),
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" page",
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GetPluralS(this.cPagePreread),
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" preread, ",
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this.cPageDirtied.ToString("N0", CultureInfo.InvariantCulture),
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" page",
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GetPluralS(this.cPageDirtied),
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" dirtied, ",
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this.cPageRedirtied.ToString("N0", CultureInfo.InvariantCulture),
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" page",
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GetPluralS(this.cPageRedirtied),
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" redirtied, ",
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this.cLogRecord.ToString("N0", CultureInfo.InvariantCulture),
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" log record",
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GetPluralS(this.cLogRecord),
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", ",
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this.cbLogRecord.ToString("N0", CultureInfo.InvariantCulture),
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" byte",
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GetPluralS(this.cbLogRecord),
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" logged");
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}
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/// <summary>
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/// Returns a value indicating whether this instance is equal
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/// to another instance.
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/// </summary>
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/// <param name="obj">An object to compare with this instance.</param>
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/// <returns>True if the two instances are equal.</returns>
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public override bool Equals(object obj)
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{
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if (obj == null || GetType() != obj.GetType())
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{
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return false;
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}
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return this.Equals((JET_THREADSTATS)obj);
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}
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/// <summary>
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/// Returns the hash code for this instance.
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/// </summary>
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/// <returns>The hash code for this instance.</returns>
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public override int GetHashCode()
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{
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return this.cPageReferenced
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^ this.cPageRead << 1
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^ this.cPagePreread << 2
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^ this.cPageDirtied << 3
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^ this.cPageRedirtied << 4
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^ this.cLogRecord << 5
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^ this.cbLogRecord << 6;
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}
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/// <summary>
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/// Returns a value indicating whether this instance is equal
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/// to another instance.
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/// </summary>
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/// <param name="other">An instance to compare with this instance.</param>
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/// <returns>True if the two instances are equal.</returns>
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public bool Equals(JET_THREADSTATS other)
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{
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return this.cbLogRecord == other.cbLogRecord
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&& this.cLogRecord == other.cLogRecord
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&& this.cPageDirtied == other.cPageDirtied
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&& this.cPagePreread == other.cPagePreread
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&& this.cPageRead == other.cPageRead
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&& this.cPageRedirtied == other.cPageRedirtied
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&& this.cPageReferenced == other.cPageReferenced;
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}
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/// <summary>
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/// Get the plural suffix ('s') for the given number.
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/// </summary>
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/// <param name="n">The number.</param>
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/// <returns>The letter 's' if n is greater than 1.</returns>
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private static string GetPluralS(int n)
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{
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return n == 1 ? string.Empty : "s";
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}
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}
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} |