/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
* Jonathan Schleifer <js@heap.zone>
*
* 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"
#import "socket.h"
OF_ASSUME_NONNULL_BEGIN
@class OFMutableArray OF_GENERIC(ObjectType);
@class OFDate;
#ifdef OF_HAVE_THREADS
@class OFMutex;
#endif
@class OFDataArray;
/*!
* @protocol OFKernelEventObserverDelegate
* OFKernelEventObserver.h ObjFW/OFKernelEventObserver.h
*
* @brief A protocol that needs to be implemented by delegates for
* OFKernelEventObserver.
*/
@protocol OFKernelEventObserverDelegate <OFObject>
@optional
/*!
* @brief This callback is called when an object did get ready for reading.
*
* @note If the object is a subclass of @ref OFStream and
* @ref OFStream::tryReadLine or @ref OFStream::tryReadTillDelimiter: has
* been called on 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 has been
* completed, the callback will be called again as long there is data in
* the cache.
*
* @param object The object which did become ready for reading
*/
- (void)objectIsReadyForReading: (id)object;
/*!
* @brief This callback is called when an object did get ready for writing.
*
* @param object The object which did become ready for writing
*/
- (void)objectIsReadyForWriting: (id)object;
@end
/*!
* @protocol OFReadyForReadingObserving
* OFKernelEventObserver.h ObjFW/OFKernelEventObserver.h
*
* @brief This protocol is implemented by classes which can be observed for
* readiness for reading by OFKernelEventObserver.
*/
@protocol OFReadyForReadingObserving <OFObject>
/*!
* @brief Returns the file descriptor for reading that should be checked by the
* OFKernelEventObserver.
*
* @return The file descriptor for reading that should be checked by the
* OFKernelEventObserver
*/
- (int)fileDescriptorForReading;
@end
/*!
* @protocol OFReadyForWritingObserving
* OFKernelEventObserver.h ObjFW/OFKernelEventObserver.h
*
* @brief This protocol is implemented by classes which can be observed for
* readiness for writing by OFKernelEventObserver.
*/
@protocol OFReadyForWritingObserving <OFObject>
/*!
* @brief Returns the file descriptor for writing that should be checked by the
* OFKernelEventObserver.
*
* @return The file descriptor for writing that should be checked by the
* OFKernelEventObserver
*/
- (int)fileDescriptorForWriting;
@end
/*!
* @class OFKernelEventObserver
* OFKernelEventObserver.h ObjFW/OFKernelEventObserver.h
*
* @brief A class that can observe multiple kernel events (e.g. streams being
* ready to read) at once.
*
* @note Currently, Win32 can only observe TCP and UDP sockets!
*/
@interface OFKernelEventObserver: OFObject
{
OFMutableArray OF_GENERIC(id <OFReadyForReadingObserving>)
*_readObjects;
OFMutableArray OF_GENERIC(id <OFReadyForWritingObserving>)
*_writeObjects;
id <OFKernelEventObserverDelegate> _delegate;
#ifdef OF_HAVE_PIPE
int _cancelFD[2];
#else
of_socket_t _cancelFD[2];
struct sockaddr_in _cancelAddr;
#endif
#ifdef OF_HAVE_THREADS
OFMutex *_mutex;
#endif
OFDataArray *_queueActions;
OFMutableArray *_queueObjects;
}
/*!
* The delegate for the OFKernelEventObserver.
*/
@property OF_NULLABLE_PROPERTY (assign)
id <OFKernelEventObserverDelegate> delegate;
/*!
* @brief Creates a new OFKernelEventObserver.
*
* @return A new, autoreleased OFKernelEventObserver
*/
+ (instancetype)observer;
/*!
* @brief Adds an object 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 object.
*
* If there is an @ref observe call blocking, it will be canceled. The reason
* for this is to prevent blocking even though the newly added object is ready.
*
* @param object The object to observe for reading
*/
- (void)addObjectForReading: (id <OFReadyForReadingObserving>)object;
/*!
* @brief Adds an object to observe for writing.
*
* If there is an @ref observe call blocking, it will be canceled. The reason
* for this is to prevent blocking even though the newly added object is ready.
*
* @param object The object to observe for writing
*/
- (void)addObjectForWriting: (id <OFReadyForWritingObserving>)object;
/*!
* @brief Removes an object to observe for reading.
*
* If there is an @ref observe call blocking, it will be canceled. The reason
* for this is to prevent the removed object from still being observed.
*
* @param object The object to remove from observing for reading
*/
- (void)removeObjectForReading: (id <OFReadyForReadingObserving>)object;
/*!
* @brief Removes an object to observe for writing.
*
* If there is an @ref observe call blocking, it will be canceled. The reason
* for this is to prevent the removed object from still being observed.
*
* @param object The object to remove from observing for writing
*/
- (void)removeObjectForWriting: (id <OFReadyForWritingObserving>)object;
/*!
* @brief Observes all objects and blocks until an event happens on an object.
*/
- (void)observe;
/*!
* @brief Observes all objects until an event happens on an object or the
* timeout is reached.
*
* @param timeInterval The time to wait for an event, in seconds
*/
- (void)observeForTimeInterval: (of_time_interval_t)timeInterval;
/*!
* @brief Observes all objects until an event happens on an object or the
* specified date is reached.
*
* @param date The until which to observe
*/
- (void)observeUntilDate: (OFDate*)date;
/*!
* @brief Cancels the currently blocking observe call.
*
* This is automatically done when a new object 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;
@end
OF_ASSUME_NONNULL_END