ObjFW  Check-in [35aab77af3]

 *
 * Note: Currently, Win32 can only observe sockets and not files!
 */
@interface OFStreamObserver: OFObject
{
	OFMutableArray *readStreams;
	OFMutableArray *writeStreams;
	OFMutableArray *queue, *queueInfo;
	id <OFStreamObserverDelegate> delegate;
#ifdef OF_HAVE_POLL
	OFDataArray *fds;
	OFMutableDictionary *fdToStream;
#else
	fd_set readfds;
	fd_set writefds;
	fd_set exceptfds;
# ifndef _WIN32
	nfds_t nfds;
# else
	int nfds;
# endif
#endif
}

#ifdef OF_HAVE_PROPERTIES
@property (retain) id <OFStreamObserverDelegate> delegate;
#endif

/**
 * 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 it set to non-blocking mode.
 * It is recommended that the stream you add is set to non-blocking mode.
 *
 * \param stream The stream to observe for reading
 */
- (void)addStreamToObserveForReading: (OFStream*)stream;

/**
 * Adds a stream to observe for writing.
 *
 * It is recommended that the stream you add it set to non-blocking mode.
 * It is recommended that the stream you add is set to non-blocking mode.
 *
 * \param stream The stream to observe for writing
 */
- (void)addStreamToObserveForWriting: (OFStream*)stream;

/**
 * Removes a stream to observe for reading.

#include "config.h"

#define OF_STREAM_OBSERVER_M

#include <string.h>

#include <assert.h>

#ifdef OF_HAVE_POLL
# include <poll.h>
#endif

#import "OFStreamObserver.h"
#import "OFDataArray.h"
#import "OFArray.h"
#import "OFDictionary.h"
#import "OFStream.h"
#import "OFNumber.h"
#import "OFAutoreleasePool.h"

#import "OFOutOfRangeException.h"

enum {
	QUEUE_ADD = 0,
	QUEUE_REMOVE = 1,
	QUEUE_READ = 0,
	QUEUE_WRITE = 2
};

@implementation OFStreamObserver
+ observer
{
	return [[[self alloc] init] autorelease];
}

- init
{
	self = [super init];

	@try {
		readStreams = [[OFMutableArray alloc] init];
		writeStreams = [[OFMutableArray alloc] init];
		queue = [[OFMutableArray alloc] init];
		queueInfo = [[OFMutableArray alloc] init];
#ifdef OF_HAVE_POLL
		fds = [[OFDataArray alloc] initWithItemSize:
		    sizeof(struct pollfd)];
		fdToStream = [[OFMutableDictionary alloc] init];
#else
		FD_ZERO(&readfds);
		FD_ZERO(&writefds);

}

- (void)dealloc
{
	[(id)delegate release];
	[readStreams release];
	[writeStreams release];
	[queue release];
	[queueInfo release];
#ifdef OF_HAVE_POLL
	[fdToStream release];
	[fds release];
#endif

	[super dealloc];
}

	if (!FD_ISSET(fd, other_fdset))
		FD_CLR(fd, &exceptfds);
}
#endif

- (void)addStreamToObserveForReading: (OFStream*)stream
{
	OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
	OFNumber *qi = [OFNumber numberWithInt: QUEUE_ADD | QUEUE_READ];

	@synchronized (queue) {
	[readStreams addObject: stream];

#ifdef OF_HAVE_POLL
		[queue addObject: stream];
		[queueInfo addObject: qi];
	}

	[self _addStream: stream
	      withEvents: POLLIN];
#else
	[pool release];
	[self _addStream: stream
	       withFDSet: &readfds];
#endif
}

- (void)addStreamToObserveForWriting: (OFStream*)stream
{
	OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
	OFNumber *qi = [OFNumber numberWithInt: QUEUE_ADD | QUEUE_WRITE];

	@synchronized (queue) {
	[writeStreams addObject: stream];

#ifdef OF_HAVE_POLL
		[queue addObject: stream];
		[queueInfo addObject: qi];
	}

	[self _addStream: stream
	      withEvents: POLLOUT];
#else
	[pool release];
	[self _addStream: stream
	       withFDSet: &writefds];
#endif
}

- (void)removeStreamToObserveForReading: (OFStream*)stream
{
	OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
	OFNumber *qi = [OFNumber numberWithInt: QUEUE_REMOVE | QUEUE_READ];
	[readStreams removeObjectIdenticalTo: stream];


	@synchronized (queue) {
		[queue addObject: stream];
		[queueInfo addObject: qi];
	}

	[pool release];
}

- (void)removeStreamToObserveForWriting: (OFStream*)stream
{
	OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
	OFNumber *qi = [OFNumber numberWithInt: QUEUE_REMOVE | QUEUE_WRITE];

	@synchronized (queue) {
		[queue addObject: stream];
		[queueInfo addObject: qi];
	}

	[pool release];
}

- (void)_processQueue
{
	@synchronized (queue) {
		OFStream **queue_c = [queue cArray];
		OFNumber **queueInfo_c = [queueInfo cArray];
		size_t i, count = [queue count];

		for (i = 0; i < count; i++) {
			switch ([queueInfo_c[i] intValue]) {
			case QUEUE_ADD | QUEUE_READ:
				[readStreams addObject: queue_c[i]];
#ifdef OF_HAVE_POLL
				[self _addStream: queue_c[i]
				      withEvents: POLLIN];
#else
				[self _addStream: queue_c[i]
				       withFDSet: &readfds];
#endif
				break;
			case QUEUE_ADD | QUEUE_WRITE:
				[writeStreams addObject: queue_c[i]];
#ifdef OF_HAVE_POLL
				[self _addStream: queue_c[i]
				      withEvents: POLLOUT];
#else
				[self _addStream: queue_c[i]
				       withFDSet: &writefds];
#endif
				break;
			case QUEUE_REMOVE | QUEUE_READ:
				[readStreams removeObjectIdenticalTo:
				    queue_c[i]];
#ifdef OF_HAVE_POLL
	[self _removeStream: stream
		 withEvents: POLLIN];
				[self _removeStream: queue_c[i]
					 withEvents: POLLIN];
#else
	[self _removeStream: stream
		  withFDSet: &readfds
		 otherFDSet: &writefds];
				[self _removeStream: queue_c[i]
					  withFDSet: &readfds
					 otherFDSet: &writefds];
#endif
}

				break;
- (void)removeStreamToObserveForWriting: (OFStream*)stream
{
	[writeStreams removeObjectIdenticalTo: stream];

			case QUEUE_REMOVE | QUEUE_WRITE:
				[writeStreams removeObjectIdenticalTo:
				    queue_c[i]];
#ifdef OF_HAVE_POLL
	[self _removeStream: stream
		 withEvents: POLLOUT];
				[self _removeStream: queue_c[i]
					 withEvents: POLLOUT];
#else
	[self _removeStream: stream
		  withFDSet: &writefds
		 otherFDSet: &readfds];
				[self _removeStream: queue_c[i]
					  withFDSet: &writefds
					 otherFDSet: &readfds];
#endif
				break;
			default:
				assert(0);
			}
		}

		[queue removeNObjects: count];
		[queueInfo removeNObjects: count];
	}
}

- (void)observe
{
	[self observeWithTimeout: -1];
}

- (BOOL)observeWithTimeout: (int)timeout
{
	OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
	BOOL foundInCache = NO;
	OFStream **cArray;
	size_t i, count;
#ifdef OF_HAVE_POLL
	struct pollfd *fds_c;
	nfds_t nfds;
	size_t nfds;
#else
	fd_set readfds_;
	fd_set writefds_;
	fd_set exceptfds_;
	struct timeval tv;
#endif

	[self _processQueue];

	cArray = [readStreams cArray];
	count = [readStreams count];

	for (i = 0; i < count; i++) {
		if (cArray[i]->cache != NULL) {
			[delegate streamDidBecomeReadyForReading: cArray[i]];