added AsyncIO

Foundation/include/Poco/AsyncStreamChannel.h

@@ -0,0 +1,96 @@
+//
+// AsyncStreamChannel.h
+//
+// $Id: //poco/Main/Foundation/include/Poco/AsyncStreamChannel.h#1 $
+//
+// Library: Foundation
+// Package: AsyncIO
+// Module:  AsyncStreamChannel
+//
+// Definition of the AsyncStreamChannel class.
+//
+// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// Permission is hereby granted, free of charge, to any person or organization
+// obtaining a copy of the software and accompanying documentation covered by
+// this license (the "Software") to use, reproduce, display, distribute,
+// execute, and transmit the Software, and to prepare derivative works of the
+// Software, and to permit third-parties to whom the Software is furnished to
+// do so, all subject to the following:
+// 
+// The copyright notices in the Software and this entire statement, including
+// the above license grant, this restriction and the following disclaimer,
+// must be included in all copies of the Software, in whole or in part, and
+// all derivative works of the Software, unless such copies or derivative
+// works are solely in the form of machine-executable object code generated by
+// a source language processor.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+//
+
+
+#ifndef Foundation_AsyncStreamChannel_INCLUDED
+#define Foundation_AsyncStreamChannel_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/AsyncIOChannel.h"
+#include <istream>
+#include <ostream>
+#include <iostream>
+
+
+namespace Poco {
+
+
+class Foundation_API AsyncStreamChannel: public AsyncIOChannel
+	/// AsyncStreamChannel provides an AsyncIOChannel for I/O streams.
+	///
+	/// Usage Example:
+	///     std::stringstream str;
+	///     AsyncStreamChannel channel(str);
+	///     channel.enqueue(new AsyncWriteCommand("Hello", 5));
+	///     channel.enqueue(new AsyncWriteCommand(", ", 2));
+	///     ActiveResult<int> result = channel.enqueue(new AsyncWriteCommand("world!", 6));
+	///     result.wait();
+	///     std::string s(str.str());
+{
+public:
+	AsyncStreamChannel(std::istream& istr);
+		/// Creates an AsyncStreamChannel using the given input stream.
+		/// Only read and seek operations will be allowed.
+		
+	AsyncStreamChannel(std::ostream& ostr);
+		/// Creates an AsyncStreamChannel using the given output stream.
+		/// Only write and seek operations will be allowed.
+
+	AsyncStreamChannel(std::iostream& iostr);
+		/// Creates an AsyncStreamChannel using the given input/output stream.
+
+	~AsyncStreamChannel();
+		/// Destroys the AsyncStreamChannel.
+	
+	// AsyncIOChannel
+	int write(const void* buffer, int length);
+	int read(void* buffer, int length);
+	int seek(std::streamoff off, std::ios::seekdir dir);
+			
+private:
+	AsyncStreamChannel();
+	
+	std::istream* _pIstr;
+	std::ostream* _pOstr;
+};
+
+
+} // namespace Poco
+
+
+#endif // Foundation_AsyncStreamChannel_INCLUDED