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/**
* @file lllfsthread.h
* @brief LLLFSThread base class
*
* $LicenseInfo:firstyear=2000&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLLFSTHREAD_H
#define LL_LLLFSTHREAD_H
#include <queue>
#include <string>
#include <map>
#include <set>
#include "llpointer.h"
#include "llqueuedthread.h"
//============================================================================
// Threaded Local File System
//============================================================================
class LLLFSThread : public LLQueuedThread
{
//------------------------------------------------------------------------
public:
enum operation_t {
FILE_READ,
FILE_WRITE,
FILE_RENAME,
FILE_REMOVE
};
//------------------------------------------------------------------------
public:
class Responder : public LLThreadSafeRefCount
{
protected:
~Responder();
public:
virtual void completed(S32 bytes) = 0;
};
class Request : public QueuedRequest
{
protected:
virtual ~Request(); // use deleteRequest()
public:
Request(LLLFSThread* thread,
handle_t handle, U32 priority,
operation_t op, const std::string& filename,
U8* buffer, S32 offset, S32 numbytes,
Responder* responder);
S32 getBytes()
{
return mBytes;
}
S32 getBytesRead()
{
return mBytesRead;
}
S32 getOperation()
{
return mOperation;
}
U8* getBuffer()
{
return mBuffer;
}
const std::string& getFilename()
{
return mFileName;
}
/*virtual*/ bool processRequest();
/*virtual*/ void finishRequest(bool completed);
/*virtual*/ void deleteRequest();
private:
LLLFSThread* mThread;
operation_t mOperation;
std::string mFileName;
U8* mBuffer; // dest for reads, source for writes, new UUID for rename
S32 mOffset; // offset into file, -1 = append (WRITE only)
S32 mBytes; // bytes to read from file, -1 = all
S32 mBytesRead; // bytes read from file
LLPointer<Responder> mResponder;
};
//------------------------------------------------------------------------
public:
LLLFSThread(bool threaded = TRUE);
~LLLFSThread();
// Return a Request handle
handle_t read(const std::string& filename, /* Flawfinder: ignore */
U8* buffer, S32 offset, S32 numbytes,
Responder* responder, U32 pri=0);
handle_t write(const std::string& filename,
U8* buffer, S32 offset, S32 numbytes,
Responder* responder, U32 pri=0);
// Misc
U32 priorityCounter() { return mPriorityCounter-- & PRIORITY_LOWBITS; } // Use to order IO operations
// static initializers
static void initClass(bool local_is_threaded = TRUE); // Setup sLocal
static S32 updateClass(U32 ms_elapsed);
static void cleanupClass(); // Delete sLocal
private:
U32 mPriorityCounter;
public:
static LLLFSThread* sLocal; // Default local file thread
};
//============================================================================
#endif // LL_LLLFSTHREAD_H
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