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53 lines
2.1 KiB
53 lines
2.1 KiB
// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT license.
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using System;
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using System.IO;
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using System.Linq.Expressions;
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using System.Runtime.InteropServices;
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namespace FASTER.core
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{
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/// <summary>
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/// Factory to create FASTER objects
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/// </summary>
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public static class Devices
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{
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/// <summary>
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/// This value is supplied for capacity when the device does not have a specified limit.
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/// </summary>
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public const long CAPACITY_UNSPECIFIED = -1;
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private const string EMULATED_STORAGE_STRING = "UseDevelopmentStorage=true;";
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private const string TEST_CONTAINER = "test";
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/// <summary>
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/// Create a storage device for the log
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/// </summary>
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/// <param name="logPath">Path to file that will store the log (empty for null device)</param>
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/// <param name="preallocateFile">Whether we try to preallocate the file on creation</param>
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/// <param name="deleteOnClose">Delete files on close</param>
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/// <param name="capacity">The maximal number of bytes this storage device can accommondate, or CAPACITY_UNSPECIFIED if there is no such limit</param>
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/// <param name="recoverDevice">Whether to recover device metadata from existing files</param>
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/// <returns>Device instance</returns>
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public static IDevice CreateLogDevice(string logPath, bool preallocateFile = true, bool deleteOnClose = false, long capacity = CAPACITY_UNSPECIFIED, bool recoverDevice = false)
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{
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if (string.IsNullOrWhiteSpace(logPath))
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return new NullDevice();
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IDevice logDevice;
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#if DOTNETCORE
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if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
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{
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logDevice = new ManagedLocalStorageDevice(logPath, preallocateFile, deleteOnClose, capacity, recoverDevice);
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}
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else
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#endif
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{
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logDevice = new LocalStorageDevice(logPath, preallocateFile, deleteOnClose, true, capacity, recoverDevice);
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}
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return logDevice;
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}
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}
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}
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