/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012
* Jonathan Schleifer <js@webkeks.org>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#import "OFObject.h"
#ifdef _WIN32
# ifndef _WIN32_WINNT
# define _WIN32_WINNT 0x0501
# endif
# include <ws2tcpip.h>
# include <windows.h>
#endif
@class OFStream;
@class OFMutableArray;
@class OFMutableDictionary;
@class OFDataArray;
@class OFMutex;
/**
* \brief A protocol that needs to be implemented by delegates for
* OFStreamObserver.
*/
#ifndef OF_STREAM_OBSERVER_M
@protocol OFStreamObserverDelegate <OFObject>
#else
@protocol OFStreamObserverDelegate
#endif
#ifdef OF_HAVE_OPTIONAL_PROTOCOLS
@optional
#endif
/**
* \brief This callback is called when a stream did get ready for reading.
*
* NOTE: When -[tryReadLine] or -[tryReadTillDelimiter:] has been called on the
* the stream, this callback will not be called again until new data has
* been received, even though there is still data in the cache. The reason
* for this is to prevent spinning in a loop when there is an incomplete
* string in the cache. Once the string is complete, the callback will be
* called again if there is data in the cache.
*
* \param stream The stream which did become ready for reading
*/
- (void)streamIsReadyForReading: (OFStream*)stream;
/**
* \brief This callback is called when a stream did get ready for writing.
*
* \param stream The stream which did become ready for writing
*/
- (void)streamIsReadyForWriting: (OFStream*)stream;
/**
* \brief This callback is called when an exception occurred on the stream.
*
* \param stream The stream on which an exception occurred
*/
- (void)streamDidReceiveException: (OFStream*)stream;
@end
/**
* \brief A class that can observe multiple streams at once.
*
* Note: Currently, Win32 can only observe sockets and not files!
*/
@interface OFStreamObserver: OFObject
{
OFMutableArray *readStreams;
OFMutableArray *writeStreams;
__unsafe_unretained OFStream **FDToStream;
size_t maxFD;
OFMutableArray *queue;
OFDataArray *queueInfo, *queueFDs;
id <OFStreamObserverDelegate> delegate;
int cancelFD[2];
#ifdef _WIN32
struct sockaddr_in cancelAddr;
#endif
OFMutex *mutex;
}
#ifdef OF_HAVE_PROPERTIES
@property (assign) id <OFStreamObserverDelegate> delegate;
#endif
/**
* \brief Creates a new OFStreamObserver.
*
* \return A new, autoreleased OFStreamObserver
*/
+ observer;
/**
* \brief Returns the delegate for the OFStreamObserver.
*
* \return The delegate for the OFStreamObserver
*/
- (id <OFStreamObserverDelegate>)delegate;
/**
* \brief Sets the delegate for the OFStreamObserver.
*
* \param delegate The delegate for the OFStreamObserver
*/
- (void)setDelegate: (id <OFStreamObserverDelegate>)delegate;
/**
* \brief Adds a stream to observe for reading.
*
* This is also used to observe a listening socket for incoming connections,
* which then triggers a read event for the observed stream.
*
* It is recommended that the stream you add is set to non-blocking mode.
*
* If there is an -[observe] call blocking, it will be canceled. The reason for
* this is to prevent blocking even though the new added stream is ready.
*
* \param stream The stream to observe for reading
*/
- (void)addStreamForReading: (OFStream*)stream;
/**
* \brief Adds a stream to observe for writing.
*
* It is recommended that the stream you add is set to non-blocking mode.
*
* If there is an -[observe] call blocking, it will be canceled. The reason for
* this is to prevent blocking even though the new added stream is ready.
*
* \param stream The stream to observe for writing
*/
- (void)addStreamForWriting: (OFStream*)stream;
/**
* \brief Removes a stream to observe for reading.
*
* If there is an -[observe] call blocking, it will be canceled. The reason for
* this is to prevent the removed stream from still being observed.
*
* \param stream The stream to remove from observing for reading
*/
- (void)removeStreamForReading: (OFStream*)stream;
/**
* \brief Removes a stream to observe for writing.
*
* If there is an -[observe] call blocking, it will be canceled. The reason for
* this is to prevent the removed stream from still being observed.
*
* \param stream The stream to remove from observing for writing
*/
- (void)removeStreamForWriting: (OFStream*)stream;
/**
* \brief Observes all streams and blocks until an event happens on a stream.
*/
- (void)observe;
/**
* \brief Observes all streams until an event happens on a stream or the
* timeout is reached.
*
* \param timeout The time to wait for an event, in seconds
* \return A boolean whether events occurred during the timeinterval
*/
- (BOOL)observeWithTimeout: (double)timeout;
/**
* \brief Cancels the currently blocking observe call.
*
* This is automatically done when a new stream is added or removed by another
* thread, but in some circumstances, it might be desirable for a thread to
* manually stop the observe running in another thread.
*/
- (void)cancel;
- (void)_addFileDescriptorForReading: (int)fd;
- (void)_addFileDescriptorForWriting: (int)fd;
- (void)_removeFileDescriptorForReading: (int)fd;
- (void)_removeFileDescriptorForWriting: (int)fd;
- (void)_processQueue;
- (BOOL)_processCache;
@end
@interface OFObject (OFStreamObserverDelegate) <OFStreamObserverDelegate>
@end