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/**
* @file llioutil.h
* @author Phoenix
* @date 2005-10-05
* @brief Helper classes for dealing with IOPipes
*
* $LicenseInfo:firstyear=2005&license=viewerlgpl$
* 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_LLIOUTIL_H
#define LL_LLIOUTIL_H
#include "llbuffer.h"
#include "lliopipe.h"
#include "llpumpio.h"
/**
* @class LLIOFlush
* @brief This class is used as a mini chain head which drains the buffer.
* @see LLIOPipe
*
* An instance of this class acts as a useful chain head when all data
* is known, and you simply want to get the chain moving.
*/
class LLIOFlush : public LLIOPipe
{
public:
LLIOFlush() {}
virtual ~LLIOFlush() {}
protected:
/* @name LLIOPipe virtual implementations
*/
//@{
/**
* @brief Process the data in buffer
*/
EStatus process_impl(
const LLChannelDescriptors& channels,
buffer_ptr_t& buffer,
bool& eos,
LLSD& context,
LLPumpIO* pump);
//@}
protected:
};
/**
* @class LLIOSleep
* @brief This is a simple helper class which will hold a chain and
* process it later using pump mechanisms
* @see LLIOPipe
*/
class LLIOSleep : public LLIOPipe
{
public:
LLIOSleep(F64 sleep_seconds) : mSeconds(sleep_seconds) {}
virtual ~LLIOSleep() {}
protected:
/* @name LLIOPipe virtual implementations
*/
//@{
/**
* @brief Process the data in buffer
*/
EStatus process_impl(
const LLChannelDescriptors& channels,
buffer_ptr_t& buffer,
bool& eos,
LLSD& context,
LLPumpIO* pump);
//@}
protected:
F64 mSeconds;
};
/**
* @class LLIOAddChain
* @brief Simple pipe that just adds a chain to a pump.
* @see LLIOPipe
*/
class LLIOAddChain : public LLIOPipe
{
public:
LLIOAddChain(const LLPumpIO::chain_t& chain, F32 timeout) :
mChain(chain),
mTimeout(timeout)
{}
virtual ~LLIOAddChain() {}
protected:
/* @name LLIOPipe virtual implementations
*/
//@{
/**
* @brief Process the data in buffer
*/
EStatus process_impl(
const LLChannelDescriptors& channels,
buffer_ptr_t& buffer,
bool& eos,
LLSD& context,
LLPumpIO* pump);
//@}
protected:
LLPumpIO::chain_t mChain;
F32 mTimeout;
};
/**
* @class LLChangeChannel
* @brief This class changes the channel of segments in the buffer
* @see LLBufferArray
*
* This class is useful for iterating over the segments in a buffer
* array and changing each channel that matches to a different
* channel.
* Example:
* <code>
* set_in_to_out(LLChannelDescriptors channels, LLBufferArray* buf)
* {
* std::for_each(
* buf->beginSegment(),
* buf->endSegment(),
* LLChangeChannel(channels.in(), channels.out()));
* }
* </code>
*/
class LLChangeChannel //: public unary_function<T, void>
{
public:
/**
* @brief Constructor for iterating over a segment range to change channel.
*
* @param is The channel to match when looking at a segment.
* @param becomes The channel to set the segment when a match is found.
*/
LLChangeChannel(S32 is, S32 becomes);
/**
* @brief Do the work of changing the channel
*/
void operator()(LLSegment& segment);
protected:
S32 mIs;
S32 mBecomes;
};
#endif // LL_LLIOUTIL_H
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