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559 lines
24 KiB
559 lines
24 KiB
//===== Copyright © 1996-2005, Valve Corporation, All rights reserved. ======//
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//
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// Purpose: Provides IAsyncFileRequest and IAsyncFileSystem Interfaces
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// and supporting objects and values
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//
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// $NoKeywords: $
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//===========================================================================//
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#ifndef IASYNCFILESYSTEM_H
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#define IASYNCFILESYSTEM_H
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#ifdef _WIN32
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#pragma once
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#endif
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#include <limits.h>
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#include "tier0/threadtools.h"
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#include "tier0/memalloc.h"
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#include "tier0/tslist.h"
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#include "tier1/interface.h"
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#include "tier1/utlsymbol.h"
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#include "tier1/functors.h"
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#include "tier1/checksum_crc.h"
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#include "tier1/utlqueue.h"
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#include "appframework/iappsystem.h"
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#include "tier2/tier2.h"
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//-----------------------------------------------------------------------------
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// "New" (circa 2009) Async FileSystem Interface
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//-----------------------------------------------------------------------------
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// This is a "newer" asynchronous-only file system interface. Using the
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// global that exposes it is intended to guarantee that no file I/O operations
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// will be blocking (unless you submit them synchronously).
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//
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//-----------------------------------------------------------------------------
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// Forward declarations we need
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//-----------------------------------------------------------------------------
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class CIOCompletionQueue;
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class IAsyncFileRequest;
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class IAsyncSearchRequest;
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//-----------------------------------------------------------------------------
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// AsyncRequestStatus_t - Contains the success / error status of an
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// asynchronous file operation
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//-----------------------------------------------------------------------------
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enum AsyncRequestStatus_t
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{
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ASYNC_REQUEST_ERROR_BADPTR = -99, // The request Pointer passed in is bad
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ASYNC_REQUEST_ERROR_ALREADYSUBMITTED = -98, // The request was already submitted
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ASYNC_REQUEST_ERROR_BADOPER = -97, // The operation type (read, write, append, etc) is invalid
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ASYNC_REQUEST_ERROR_BADUSERBUFFER = -96, // The supplied user buffer is incomplete
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ASYNC_REQUEST_ERROR_NOBUFFER = -95, // The operation requested requires a valid user buffer
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ASYNC_REQUEST_ERROR_NONOTIFICATION = -94, // User did not specify a callback or an IOResultQueue to message
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ASYNC_REQUEST_ERROR_NOTSUBMITTED = -93, // The request has not yet been submitted
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ASYNC_REQUEST_ERROR_ALREADYSERVICED = -92, // The request has already been serviced
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ASYNC_REQUEST_ERROR_PATHTOOLONG = -89, // The filepath+name is too long
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ASYNC_REQUEST_ERROR_INVALIDFILENAME = -88, // The Filename contains invalid characters
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ASYNC_REQUEST_ERROR_BADPATHSPEC = -87, // adjacent path separators in the filename or ends in path char
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ASYNC_REQUEST_ERROR_FILENAMETOOLONG = -86, // the filename is too long...
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ASYNC_REQUEST_ERROR_NOTVALIDSYNCRONOUS = -85, // Request (callbacks) not valid in synchronous mode
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// these mirror the existing async file system return codes. remove when changed
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ASYNC_REQUEST_ERROR_ALIGNMENT = -16, // read parameters invalid for unbuffered IO
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ASYNC_REQUEST_ERROR_FAILURE = -15, // hard subsystem failure
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ASYNC_REQUEST_ERROR_READING = -14, // read error on file
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ASYNC_REQUEST_ERROR_NOMEMORY = -13, // out of memory for file read
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ASYNC_REQUEST_ERROR_UNKNOWNID = -12, // caller's provided id is not recognized
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ASYNC_REQUEST_ERROR_FILEOPEN = -11, // filename could not be opened (bad path, not exist, etc)
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ASYNC_REQUEST_STATUS_UNDEFINED = -1, // should never be this (indicates incomplete code path)
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ASYNC_REQUEST_OK = 0, // operation is successful
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ASYNC_REQUEST_FORCE_INT32 = INT32_MAX // force AsyncRequestStatus_t to 32 bits
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};
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//-----------------------------------------------------------------------------
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// AsyncRequestState_t - indicates what state / stage of processing that an
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// async request is in
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//-----------------------------------------------------------------------------
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enum AsyncRequestState_t
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{
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ASYNC_REQUEST_STATE_UNDEFINED = 0, // The request is probably invalid
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ASYNC_REQUEST_STATE_COMPOSING = 1, // The request is being composed (open for edit)
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ASYNC_REQUEST_STATE_SUBMITTED, // The request is in the priority queue waiting to be serviced
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ASYNC_REQUEST_STATE_SERVICING, // The request is being processed by a job thread
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ASYNC_REQUEST_STATE_AWATING_FINISH, // The request has completed IO, and waiting to be post-processed by user code
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ASYNC_REQUEST_STATE_COMPLETED, // The request has completed all tasks
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ASYNC_REQUEST_STATE_FORCE_INT32 = INT32_MAX // force AsyncRequestStatus_t to 32 bits
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};
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//-----------------------------------------------------------------------------
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// AsyncFileOperation_t - list of I/O options the new async system supports
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//
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//-----------------------------------------------------------------------------
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enum AsyncFileOperation_t
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{
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ASYNC_OP_UNDEFINED = 0, // mapping undefined to 0 so that a value must be set (constructors memsets to 0)
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ASYNC_OP_READFILE, // This is a read request
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ASYNC_OP_WRITEFILE, // Write data to a file, delete if existing??
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ASYNC_OP_APPENDFILE, // Append to end of file, must file exist?
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ASYNC_OP_SCANDIR, // Scan a directory looking for name-matched files
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ASYNC_OP_COUNT, // Automatic list count
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ASYNC_OP_GROUP, // Object is a container of requests
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ASYNC_OP_FORCE_INT32 = INT32_MAX
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};
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//-----------------------------------------------------------------------------
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// IAsyncRequestBase - Interface common to all types of
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// asynchronous file IO requests
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//
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//-----------------------------------------------------------------------------
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class IAsyncRequestBase
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{
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friend class CAsyncFileSystem;
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friend class CAsyncGroupRequest;
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public:
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// functions to query operation
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virtual AsyncFileOperation_t GetAsyncOperationType() = 0; // Interface to determine what the derived type is
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// Completion options
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virtual void AssignCallback( CFunctor* pCallback ) = 0; // Add a completion callback to this request
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virtual void AssignResultQueue( CIOCompletionQueue* pMsgQueue ) = 0; // Send a completion notification to this queue object
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virtual void AssignCallbackAndQueue( CIOCompletionQueue* pMsgQueue, CFunctor* pCallback ) = 0; // assign a callback and a completion queue
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// Completion processing functions
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virtual void ProcessCallback( bool bReleaseRequest = true ) = 0; // Perform any assigned callbacks
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virtual void KeepRequestPostCallback() = 0; // User wants to keep request alive after the callback completes
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virtual void DontKeepRequestPostCallback() = 0; // User doesn't want to keep request after the callback completes
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virtual void Release() = 0; // lets user manually release the async request (only valid when completed)
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// Priority Functions
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virtual void SetPriority( int32 nPriority ) = 0; // lets the user set or change the priority of this request
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virtual int32 GetPriority() = 0; // queries the priority of this request
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// Status & Results functions
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virtual AsyncRequestState_t GetRequestState() = 0; // Returns what phase of the Async Process the request is in
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virtual AsyncRequestStatus_t GetRequestStatus() = 0; // Returns the error status of the last IO operation performed by this request
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private:
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virtual class CAsyncRequestBase* GetBase() = 0; // Used internally by the AsyncFileSystem
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};
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//-----------------------------------------------------------------------------
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// IAsyncRequestGroup - Interface for grouping requests together
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//
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//
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//-----------------------------------------------------------------------------
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class IAsyncGroupRequest : public IAsyncRequestBase
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{
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public:
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virtual void AddAsyncRequest( IAsyncRequestBase* pRequest ) = 0;
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virtual int32 GetAsyncRequestCount() = 0;
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virtual IAsyncRequestBase* GetAsyncRequest( int32 nRNum ) = 0;
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virtual IAsyncFileRequest* GetAsyncFileRequest( int32 nRNum ) = 0;
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virtual IAsyncSearchRequest* GetAsyncSearchRequest( int32 nRNum ) = 0;
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virtual void ReleaseAsyncRequest( int32 nRNum ) = 0;
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};
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//-----------------------------------------------------------------------------
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// IAsyncFileRequest - Interface for setting and reading the results of an
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// asynchronous file IO request
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//
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//-----------------------------------------------------------------------------
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class IAsyncFileRequest : public IAsyncRequestBase
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{
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public:
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// functions to set filename and operation
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virtual void LoadFile( const char* pFileName ) = 0; // make this a 'read data from file' request
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virtual void SaveFile( const char* pFileName ) = 0; // make this a 'write data to file' request
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virtual void AppendFile( const char* pFileName ) = 0; // make this a 'append data to file' request
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virtual void SetFileName( const char* pFileName ) = 0; // assign the filename to use
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virtual const char* GetFileName() = 0; // get the filename we've assigned
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// Buffer control functions - user supplied data buffer
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virtual void SetUserBuffer( void* pDataBuffer, size_t nBufferSize ) = 0; // User supplies a memory buffer to use, which they own the memory for
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virtual void* GetUserBuffer() = 0; // returns the address of the user supplied buffer
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virtual size_t GetUserBufferSize() = 0; // returns the size of the user supplied buffer
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virtual void ProvideDataBuffer() = 0; // Let the async file system provide a buffer to hold the data transferred (valid for Load/Read only)
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// Buffer results - the data buffer can be user supplied or async system supplied
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virtual void* GetResultBuffer() = 0; // Returns the address of the data transferred
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virtual size_t GetResultBufferSize() = 0; // Returns the size of the buffer holding the data transferred
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virtual size_t GetIOTransferredSize() = 0; // Returns the number of bytes of data actually transferred
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// Memory control functions for buffers allocated by the async file system
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virtual void KeepResultBuffer() = 0; // User wants to keeps buffer allocated by the file system
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virtual void ReleaseResultBuffer() = 0; // User decides they want the request to take care of releasing the buffer
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// file position functions
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virtual void ReadFileDataAt( int64 nFileOffset, size_t nReadSize = 0 ) = 0; // Read file data starting at supplied offset, optional max size to read
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virtual void WriteFileDataAt( int64 nFileOffset, size_t nWriteSize = 0 ) = 0; // Write data to file at supplied offset, optional size to write (max size of buffer)
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};
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//-----------------------------------------------------------------------------
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// CDirectoryEntryInfo_t - File Information gathered by async directory searches
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// Designed to be cross platform
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//
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//-----------------------------------------------------------------------------
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struct CDirectoryEntryInfo_t
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{
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public:
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char m_FullFileName[MAX_PATH];
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};
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//-----------------------------------------------------------------------------
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// IAsyncSearchRequest - Interface for setting and reading the results
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// of an asynchronous directory search request
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//
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//-----------------------------------------------------------------------------
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class IAsyncSearchRequest : public IAsyncRequestBase
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{
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public:
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// functions to define the request
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virtual void SetSearchFilespec( const char* pFullSearchSpec ) = 0;
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virtual void SetSearchPathAndFileSpec( const char* pPathId, const char* pRelativeSearchSpec ) = 0;
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virtual void SetSearchPathAndFileSpec( const char* pPathId, const char* pRelativeSearchPath, const char* pSearchSpec ) = 0;
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virtual void SetSubdirectoryScan( const bool bInclude ) = 0;
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virtual bool GetSubdirectoryScan() = 0;
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// Functions to return the results.
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virtual int GetResultCount() = 0;
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virtual CDirectoryEntryInfo_t* GetResult( int rNum = 0 ) = 0;
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virtual const char* GetMatchedFile( int rNum = 0 ) = 0;
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};
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//-----------------------------------------------------------------------------
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// CAsyncIOResult_t - Holds the result of an async file I/O request in a
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// CIOCompletionQueue
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//-----------------------------------------------------------------------------
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struct CAsyncIOResult_t
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{
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public:
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IAsyncRequestBase* m_pRequest; // Handle of the job
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AsyncRequestStatus_t m_Status; // Result status
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inline CAsyncIOResult_t();
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inline void ProcessCallback();
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};
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//-----------------------------------------------------------------------------
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// CAsyncIOResult_t - Inline method Implementations
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//
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//
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// CAsyncIOResult_t - Constructor
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//-----------------------------------------------------------------------------
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inline CAsyncIOResult_t::CAsyncIOResult_t()
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{
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m_pRequest = NULL;
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m_Status = ASYNC_REQUEST_STATUS_UNDEFINED;
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}
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//-----------------------------------------------------------------------------
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// CAsyncIOResult_t - process the user callback
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//-----------------------------------------------------------------------------
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inline void CAsyncIOResult_t::ProcessCallback()
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{
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if ( m_pRequest != NULL )
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{
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m_pRequest->ProcessCallback();
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}
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}
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//-----------------------------------------------------------------------------
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// CIOCompletionQueue - Dedicated Queue containing Async IO Notifications
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//-----------------------------------------------------------------------------
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class CIOCompletionQueue
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{
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private:
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CTSQueue< CAsyncIOResult_t > m_TSIOResultQueue;
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public:
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inline void Insert( CAsyncIOResult_t& theResult);
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inline bool IsEmpty();
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inline bool IsNotEmpty();
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inline void ProcessAllResultCallbacks();
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inline bool RemoveAtHead( CAsyncIOResult_t& theResult );
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};
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//-----------------------------------------------------------------------------
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// CIOCompletionQueue - Inline Implementation
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// CIOCompletionQueue - insert message into queue
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//-----------------------------------------------------------------------------
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inline void CIOCompletionQueue::Insert( CAsyncIOResult_t& theResult)
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{
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m_TSIOResultQueue.PushItem( theResult );
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}
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//-----------------------------------------------------------------------------
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// CIOCompletionQueue - check if queue empty
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//-----------------------------------------------------------------------------
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inline bool CIOCompletionQueue::IsEmpty()
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{
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return ( m_TSIOResultQueue.Count() == 0 );
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}
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//-----------------------------------------------------------------------------
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// CIOCompletionQueue - check if queue is not empty
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//-----------------------------------------------------------------------------
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inline bool CIOCompletionQueue::IsNotEmpty()
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{
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return ( m_TSIOResultQueue.Count() != 0 );
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}
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//-----------------------------------------------------------------------------
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// CIOCompletionQueue constructor
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//-----------------------------------------------------------------------------
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inline void CIOCompletionQueue::ProcessAllResultCallbacks()
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{
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CAsyncIOResult_t IOResult;
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while ( m_TSIOResultQueue.PopItem( &IOResult ) )
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{
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IOResult.ProcessCallback(); // no lock needed here, we are outside of the queue
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};
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}
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//-----------------------------------------------------------------------------
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// CIOCompletionQueue - pop off the first item
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//-----------------------------------------------------------------------------
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inline bool CIOCompletionQueue::RemoveAtHead( CAsyncIOResult_t& theResult )
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{
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return ( m_TSIOResultQueue.PopItem( &theResult ) );
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}
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//-----------------------------------------------------------------------------
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// IAsyncFileSystem - Interface to new async user methods
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//
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//-----------------------------------------------------------------------------
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class IAsyncFileSystem : public IAppSystem
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{
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public:
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//------------------------------------
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// Global operations
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//------------------------------------
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virtual AsyncRequestStatus_t SubmitAsyncFileRequest( const IAsyncRequestBase* pRequest ) = 0;
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virtual AsyncRequestStatus_t SubmitSyncFileRequest( const IAsyncRequestBase* pRequest ) = 0;
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virtual AsyncRequestStatus_t GetAsyncFileRequestStatus( const IAsyncRequestBase* pRequest ) = 0;
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virtual AsyncRequestStatus_t AbortAsyncFileRequest( const IAsyncRequestBase* pRequest ) = 0;
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virtual void SuspendAllAsyncIO( bool bWaitForIOCompletion = true ) = 0;
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virtual void ResumeAllAsyncIO() = 0;
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virtual AsyncRequestStatus_t AbortAllAsyncIO( bool bWaitForIOCompletion = true ) = 0;
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virtual IAsyncFileRequest* CreateNewFileRequest() = 0;
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virtual IAsyncSearchRequest* CreateNewSearchRequest() = 0;
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virtual IAsyncGroupRequest* CreateNewAsyncRequestGroup() = 0;
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virtual void ReleaseAsyncRequest( const IAsyncRequestBase* pRequest ) = 0;
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virtual bool BlockUntilAsyncIOComplete( const IAsyncRequestBase* pRequest ) = 0;
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virtual void* AllocateBuffer( size_t nBufferSize, int nAlignment = 4 ) = 0;
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virtual void ReleaseBuffer( void* pBuffer ) = 0;
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};
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//-----------------------------------------------------------------------------
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// Globals Exposed
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//-----------------------------------------------------------------------------
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DECLARE_TIER2_INTERFACE( IAsyncFileSystem, g_pAsyncFileSystem );
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//-----------------------------------------------------------------------------
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// New Async Filesystem Request Helpers
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//-----------------------------------------------------------------------------
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// These are functions that simplify and clarify the setup of common file
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// operations in the new asynchronous file system.
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//
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// Placed inline for linkage convenience
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//
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// If you have a generic helper you commonly use, add it to this list
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//
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//-----------------------------------------------------------------------------
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// ::AsyncReadFile() - Helper function to setup a New Async Request
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// load an entire file file, allocate a buffer, use all other defaults
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//-----------------------------------------------------------------------------
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inline IAsyncFileRequest* AsyncReadFile( const char* pFileName )
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{
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IAsyncFileRequest* theRequest = g_pAsyncFileSystem->CreateNewFileRequest(); // Open a new request
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theRequest->LoadFile( pFileName ); // specify file and set request type to read
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theRequest->ProvideDataBuffer(); // Let the request provide and own the memory
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return theRequest; // return request object pointer
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}
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//-----------------------------------------------------------------------------
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// ::AsyncReadFileToBuffer() - Helper function to setup a New Async Request
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// load an entire file file, to a supplied buffer, use all defaults
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//-----------------------------------------------------------------------------
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inline IAsyncFileRequest* AsyncReadFileToBuffer( const char* pFileName, void* pBuffer, size_t nBufferSize )
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{
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IAsyncFileRequest* theRequest = g_pAsyncFileSystem->CreateNewFileRequest(); // Open a new request
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theRequest->LoadFile( pFileName ); // specify file and set request type to read
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theRequest->SetUserBuffer( pBuffer, nBufferSize ); // Specify the buffer we are using
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return theRequest; // return request object pointer
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}
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//-----------------------------------------------------------------------------
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// ::AsyncReadFileBlock() - Helper function to setup a New Async Request
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// load an portion of a file, allocate a buffer, use all defaults
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//-----------------------------------------------------------------------------
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inline IAsyncFileRequest* AsyncReadFileBlock( const char* pFileName, int64 nOffset, size_t nLoadSize )
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{
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IAsyncFileRequest* theRequest = g_pAsyncFileSystem->CreateNewFileRequest(); // Open a new request
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theRequest->LoadFile( pFileName ); // specify file and set request type to read
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theRequest->ReadFileDataAt( nOffset, nLoadSize ); // Specify the part of the file we want to read
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theRequest->ProvideDataBuffer(); // Let the request provide and own the memory
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return theRequest; // return request object pointer
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}
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//-----------------------------------------------------------------------------
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// ::AsyncReadFileBlockToBuffer() - Helper function to setup a New Async Request
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// load an portion of a file, to a supplied buffer, use all defaults
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//-----------------------------------------------------------------------------
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inline IAsyncFileRequest* AsyncReadFileBlockToBuffer( const char* pFileName, int64 nOffset, size_t nLoadSize, void* pBuffer, size_t nBufferSize )
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{
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IAsyncFileRequest* theRequest = g_pAsyncFileSystem->CreateNewFileRequest(); // Open a new request
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theRequest->LoadFile( pFileName ); // specify file and set request type to read
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theRequest->ReadFileDataAt( nOffset, nLoadSize ); // Specify the part of the file we want to read
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theRequest->SetUserBuffer( pBuffer, nBufferSize ); // Specify the buffer we are using
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return theRequest; // return request object pointer
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}
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//-----------------------------------------------------------------------------
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// ::AsyncWriteBufferToFile() - Helper function to setup a New Async Request
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// write a buffer to a file, overwriting existing, use all defaults
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//-----------------------------------------------------------------------------
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inline IAsyncFileRequest* AsyncWriteBufferToFile( const char* pFileName, void* pBuffer, size_t nBufferSize )
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{
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IAsyncFileRequest* theRequest = g_pAsyncFileSystem->CreateNewFileRequest(); // Open a new request
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theRequest->SaveFile( pFileName ); // Specify file and set request type to write
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theRequest->SetUserBuffer( pBuffer, nBufferSize ); // Specify the buffer we are using
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return theRequest; // return request object pointer
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}
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//-----------------------------------------------------------------------------
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// ::AsyncAppendBufferToFile() - Helper function to setup a New Async Request
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// write a buffer to a file, append to if existing, use all defaults
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//-----------------------------------------------------------------------------
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inline IAsyncFileRequest* AsyncAppendBufferToFile( const char* pFileName, void* pBuffer, size_t nBufferSize )
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{
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IAsyncFileRequest* theRequest = g_pAsyncFileSystem->CreateNewFileRequest(); // Open a new request
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theRequest->AppendFile( pFileName ); // Specify file and set request type to append data to
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theRequest->SetUserBuffer( pBuffer, nBufferSize ); // Specify the buffer we are using
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return theRequest; // return request object pointer
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}
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//-----------------------------------------------------------------------------
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// ::AsyncRequestRelease() - Helper function to release Async Request
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|
// calls release, sets the handle to null
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|
//-----------------------------------------------------------------------------
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|
inline void AsyncRequestRelease( IAsyncRequestBase* pRequest )
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|
{
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|
g_pAsyncFileSystem->ReleaseAsyncRequest( pRequest );
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|
pRequest = NULL;
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|
}
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//-----------------------------------------------------------------------------
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// ::NewAsyncRequestGroup() - Helper function to set up a new file search
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|
// used with a search path..
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|
//-----------------------------------------------------------------------------
|
|
inline IAsyncSearchRequest* AsyncFindFiles( const char* pPathID, const char* pSearchSpec )
|
|
{
|
|
IAsyncSearchRequest* theRequest = g_pAsyncFileSystem->CreateNewSearchRequest(); // Open a new request
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|
|
|
theRequest->SetSearchPathAndFileSpec( pPathID, pSearchSpec );
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|
theRequest->SetSubdirectoryScan( false );
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|
|
|
return theRequest; // return request object pointer
|
|
}
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|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// ::NewAsyncRequestGroup() - Helper function to set up a new request group
|
|
// object
|
|
//-----------------------------------------------------------------------------
|
|
inline IAsyncGroupRequest* NewAsyncRequestGroup()
|
|
{
|
|
return g_pAsyncFileSystem->CreateNewAsyncRequestGroup();
|
|
}
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|
|
|
|
|
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#endif // IASYNCFILESYSTEM_H
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