src/stream/ZStreamRW_FlushOnRead.h

00001 /*  @(#) $Id: ZStreamRW_FlushOnRead.h,v 1.5 2006/04/27 03:19:32 agreen Exp $ */
00002 
00003 /* ------------------------------------------------------------
00004 Copyright (c) 2004 Andrew Green and Learning in Motion, Inc.
00005 http://www.zoolib.org
00006 
00007 Permission is hereby granted, free of charge, to any person obtaining a copy
00008 of this software and associated documentation files (the "Software"), to deal
00009 in the Software without restriction, including without limitation the rights
00010 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00011 copies of the Software, and to permit persons to whom the Software is
00012 furnished to do so, subject to the following conditions:
00013 
00014 The above copyright notice and this permission notice shall be included in
00015 all copies or substantial portions of the Software.
00016 
00017 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00018 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00019 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00020 COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
00021 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
00022 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00023 ------------------------------------------------------------ */
00024 
00025 #ifndef __ZStreamRW_FlushOnRead__
00026 #define __ZStreamRW_FlushOnRead__ 1
00027 
00028 #include "zconfig.h"
00029 
00030 #include "ZStreamer.h"
00031 
00032 // =================================================================================================
00033 #pragma mark -
00034 #pragma mark * ZStreamRW_FlushOnRead
00035 
00037 
00038 class ZStreamRW_FlushOnRead : public ZStreamR, public ZStreamW
00039         {
00040 public:
00041         ZStreamRW_FlushOnRead(const ZStreamR& iStreamR, const ZStreamW& iStreamW);
00042         ~ZStreamRW_FlushOnRead();
00043 
00044 // From ZStreamR
00045         virtual void Imp_Read(void* iDest, size_t iCount, size_t* oCountRead);
00046         virtual size_t Imp_CountReadable();
00047 
00048         virtual void Imp_CopyToDispatch(const ZStreamW& iStreamW, uint64 iCount,
00049                 uint64* oCountRead, uint64* oCountWritten);
00050 
00051         virtual void Imp_CopyTo(const ZStreamW& iStreamW, uint64 iCount,
00052                 uint64* oCountRead, uint64* oCountWritten);
00053 
00054         virtual void Imp_Skip(uint64 iCount, uint64* oCountSkipped);
00055 
00056 // From ZStreamW
00057         virtual void Imp_Write(const void* iSource, size_t iCount, size_t* oCountWritten);
00058 
00059         virtual void Imp_CopyFromDispatch(const ZStreamR& iStreamR, uint64 iCount,
00060                 uint64* oCountRead, uint64* oCountWritten);
00061 
00062         virtual void Imp_CopyFrom(const ZStreamR& iStreamR, uint64 iCount,
00063                 uint64* oCountRead, uint64* oCountWritten);
00064 
00065         virtual void Imp_Flush();
00066 
00067 protected:
00068         ZThreadSafe_t fLastWasWrite;
00069         ZMutexNR fMutex_Write;
00070         const ZStreamR& fStreamR;
00071         const ZStreamW& fStreamW;
00072         };
00073 
00074 // =================================================================================================
00075 #pragma mark -
00076 #pragma mark * ZStreamerRW_FlushOnRead
00077 
00079 
00080 class ZStreamerRW_FlushOnRead : public ZStreamerRW
00081         {
00082 public:
00083         ZStreamerRW_FlushOnRead(ZRef<ZStreamerR> iStreamerR, ZRef<ZStreamerW> iStreamerW);
00084         virtual ~ZStreamerRW_FlushOnRead();
00085 
00086 // From ZStreamerR via ZStreamerRW
00087         virtual const ZStreamR& GetStreamR();
00088 
00089 // From ZStreamerW via ZStreamerRW
00090         virtual const ZStreamW& GetStreamW();
00091 
00092 protected:
00093         ZRef<ZStreamerR> fStreamerR;
00094         ZRef<ZStreamerW> fStreamerW;
00095         ZStreamRW_FlushOnRead fStream;
00096         };
00097 
00098 #endif // __ZStreamRW_FlushOnRead__

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