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/*
Copyright (C) 2000 Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef DATAPACKET_H
#define DATAPACKET_H
#include "arts_export.h"
#include "buffer.h"
/*
* BC - Status (2002-03-08): GenericDataChannel, DataPacket types
*
* These classes must be kept binary compatible, as the do interact with
* generated code. So you MUST KNOW WHAT YOU ARE DOING, once you start
* using the provided d pointers for extensions.
*/
namespace Arts {
class GenericDataChannelPrivate;
class GenericDataPacket;
/*
* The GenericDataChannel interface is to be implemented by the flowsystem
*/
class ARTS_EXPORT GenericDataChannel {
private:
GenericDataChannelPrivate *d; // unused
protected:
friend class GenericDataPacket;
/*
* this is used internally by DataPacket
*/
virtual void processedPacket(GenericDataPacket *packet) = 0;
/*
* used internally by DataPacket
*/
virtual void sendPacket(GenericDataPacket *packet) = 0;
public:
/*
* used to set pull delivery mode
*/
virtual void setPull(int packets, int capacity) = 0;
virtual void endPull() = 0;
GenericDataChannel() : d(0)
{
}
};
/*
* DataPackets are the heard of asynchronous streaming (MCOP has synchronous
* and asynchronous streams). They are used
*
* - in the interface async streams expose to C++ implementations of MCOP
* interfaces (they directly deal with datapackets)
*
* - from the FlowSystem implemenentations
*/
/**
* The GenericDataPacket class provides the interface the flow system can
* use to deal with data packets.
*/
class GenericDataPacketPrivate;
class ARTS_EXPORT GenericDataPacket {
private:
GenericDataPacketPrivate *d;
static long _staticDataPacketCount;
public:
/**
* the amount of active data packets (memory leak debugging only)
*/
static long _dataPacketCount() { return _staticDataPacketCount; }
/**
* the channel this datapacket belongs to
*/
GenericDataChannel *channel;
/**
* ensureCapactity ensures that there is room for at least capacity
* Elements in the packet. This is implemented destructive - that
* means: you may not find your old contents in the packet after
* calling ensureCapacity
*/
virtual void ensureCapacity(int capacity) = 0;
/**
* read/write write the contents of the packet. Read will also
* automatically ensure that capacity is adapted before reading.
*/
virtual void read(Buffer& stream) = 0;
virtual void write(Buffer& stream) = 0;
/**
* having size here (and not in the derived concrete DataPackets) is so
* that we can see whether the sender can't supply more data (and starts
* sending zero size packets
*/
int size;
/**
* useCount is to be set from sendPacket
*/
int useCount;
inline void send()
{
channel->sendPacket(this);
}
inline void processed()
{
useCount--;
if(useCount == 0)
{
if(channel)
channel->processedPacket(this);
else
delete this;
}
}
virtual ~GenericDataPacket()
{
_staticDataPacketCount--;
}
protected:
GenericDataPacket(GenericDataChannel *channel)
:d(0),channel(channel),useCount(0)
{
_staticDataPacketCount++;
}
};
/**
* The DataPacket<T> interface is what C++ implementations of MCOP interfaces
* will need to use.
*/
template<class T>
class DataPacket : public GenericDataPacket {
public:
T *contents;
protected:
DataPacket(GenericDataChannel *channel)
: GenericDataPacket(channel) {}
~DataPacket() {}
};
/**
* The RawDataPacket<T> interface handles raw class T arrays of data
*/
template<class T>
class RawDataPacket : public DataPacket<T> {
protected:
int capacity;
void ensureCapacity(int newCapacity)
{
if(newCapacity > capacity)
{
delete[] this->contents;
capacity = newCapacity;
this->contents = new T[capacity];
}
}
RawDataPacket(int capacity, GenericDataChannel *channel)
:DataPacket<T>(channel), capacity(capacity)
{
this->size = capacity;
this->contents = new T[capacity];
}
~RawDataPacket()
{
delete[] this->contents;
}
};
/**
* FloatDataPacket finally is one concrete DataPacket (which contains the
* information how to marshal a datapacket of type float)
*/
class ARTS_EXPORT FloatDataPacket : public RawDataPacket<float> {
public:
FloatDataPacket(int capacity, GenericDataChannel *channel)
: RawDataPacket<float>(capacity, channel)
{
//
}
void read(Buffer& stream);
void write(Buffer& stream);
};
class ARTS_EXPORT ByteDataPacket : public RawDataPacket<mcopbyte> {
public:
ByteDataPacket(int capacity, GenericDataChannel *channel)
: RawDataPacket<mcopbyte>(capacity, channel)
{
//
}
void read(Buffer& stream);
void write(Buffer& stream);
};
}
#endif
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