481 lines
15 KiB
Objective-C
481 lines
15 KiB
Objective-C
/* =============================================================================
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FILE: UKKQueue.m
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PROJECT: Filie
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COPYRIGHT: (c) 2003 M. Uli Kusterer, all rights reserved.
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AUTHORS: M. Uli Kusterer - UK
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LICENSES: MIT License
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REVISIONS:
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2006-03-13 UK Clarified license, streamlined UKFileWatcher stuff,
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Changed notifications to be useful and turned off by
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default some deprecated stuff.
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2004-12-28 UK Several threading fixes.
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2003-12-21 UK Created.
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========================================================================== */
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// -----------------------------------------------------------------------------
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// Headers:
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// -----------------------------------------------------------------------------
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#import "UKKQueue.h"
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#import "UKMainThreadProxy.h"
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#import <unistd.h>
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#import <fcntl.h>
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// -----------------------------------------------------------------------------
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// Macros:
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// -----------------------------------------------------------------------------
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// @synchronized isn't available prior to 10.3, so we use a typedef so
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// this class is thread-safe on Panther but still compiles on older OSs.
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#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_3
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#define AT_SYNCHRONIZED(n) @synchronized(n)
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#else
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#define AT_SYNCHRONIZED(n)
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#endif
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// -----------------------------------------------------------------------------
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// Globals:
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// -----------------------------------------------------------------------------
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static UKKQueue * gUKKQueueSharedQueueSingleton = nil;
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@implementation UKKQueue
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// Deprecated:
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#if UKKQUEUE_OLD_SINGLETON_ACCESSOR_NAME
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+(UKKQueue*) sharedQueue
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{
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return [self sharedFileWatcher];
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}
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#endif
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// -----------------------------------------------------------------------------
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// sharedQueue:
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// Returns a singleton queue object. In many apps (especially those that
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// subscribe to the notifications) there will only be one kqueue instance,
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// and in that case you can use this.
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//
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// For all other cases, feel free to create additional instances to use
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// independently.
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//
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// REVISIONS:
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// 2006-03-13 UK Renamed from sharedQueue.
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// 2005-07-02 UK Created.
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// -----------------------------------------------------------------------------
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+(id) sharedFileWatcher
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{
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AT_SYNCHRONIZED( self )
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{
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if( !gUKKQueueSharedQueueSingleton )
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gUKKQueueSharedQueueSingleton = [[UKKQueue alloc] init]; // This is a singleton, and thus an intentional "leak".
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}
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return gUKKQueueSharedQueueSingleton;
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}
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// -----------------------------------------------------------------------------
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// * CONSTRUCTOR:
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// Creates a new KQueue and starts that thread we use for our
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// notifications.
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//
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// REVISIONS:
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// 2004-11-12 UK Doesn't pass self as parameter to watcherThread anymore,
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// because detachNewThreadSelector retains target and args,
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// which would cause us to never be released.
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// 2004-03-13 UK Documented.
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// -----------------------------------------------------------------------------
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-(id) init
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{
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self = [super init];
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if( self )
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{
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queueFD = kqueue();
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if( queueFD == -1 )
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{
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[self release];
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return nil;
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}
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watchedPaths = [[NSMutableArray alloc] init];
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watchedFDs = [[NSMutableArray alloc] init];
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// Start new thread that fetches and processes our events:
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keepThreadRunning = YES;
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[NSThread detachNewThreadSelector:@selector(watcherThread:) toTarget:self withObject:nil];
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}
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return self;
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}
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// -----------------------------------------------------------------------------
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// release:
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// Since NSThread retains its target, we need this method to terminate the
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// thread when we reach a retain-count of two. The thread is terminated by
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// setting keepThreadRunning to NO.
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//
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// REVISIONS:
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// 2004-11-12 UK Created.
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// -----------------------------------------------------------------------------
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-(oneway void) release
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{
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AT_SYNCHRONIZED(self)
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{
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//NSLog(@"%@ (%d)", self, [self retainCount]);
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if( [self retainCount] == 2 && keepThreadRunning )
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keepThreadRunning = NO;
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}
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[super release];
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}
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// -----------------------------------------------------------------------------
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// * DESTRUCTOR:
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// Releases the kqueue again.
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//
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// REVISIONS:
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// 2004-03-13 UK Documented.
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// -----------------------------------------------------------------------------
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-(void) dealloc
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{
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delegate = nil;
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[delegateProxy release];
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if( keepThreadRunning )
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keepThreadRunning = NO;
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// Close all our file descriptors so the files can be deleted:
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NSEnumerator* enny = [watchedFDs objectEnumerator];
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NSNumber* fdNum;
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while( (fdNum = [enny nextObject]) )
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{
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if( close( [fdNum intValue] ) == -1 )
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NSLog(@"dealloc: Couldn't close file descriptor (%d)", errno);
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}
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[watchedPaths release];
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watchedPaths = nil;
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[watchedFDs release];
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watchedFDs = nil;
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[super dealloc];
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//NSLog(@"kqueue released.");
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}
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// -----------------------------------------------------------------------------
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// queueFD:
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// Returns a Unix file descriptor for the KQueue this uses. The descriptor
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// is owned by this object. Do not close it!
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//
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// REVISIONS:
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// 2004-03-13 UK Documented.
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// -----------------------------------------------------------------------------
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-(int) queueFD
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{
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return queueFD;
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}
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// -----------------------------------------------------------------------------
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// addPathToQueue:
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// Tell this queue to listen for all interesting notifications sent for
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// the object at the specified path. If you want more control, use the
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// addPathToQueue:notifyingAbout: variant instead.
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//
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// REVISIONS:
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// 2004-03-13 UK Documented.
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// -----------------------------------------------------------------------------
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-(void) addPathToQueue: (NSString*)path
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{
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[self addPath: path];
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}
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-(void) addPath: (NSString*)path
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{
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[self addPathToQueue: path notifyingAbout: UKKQueueNotifyAboutRename
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| UKKQueueNotifyAboutWrite
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| UKKQueueNotifyAboutDelete
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| UKKQueueNotifyAboutAttributeChange];
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}
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// -----------------------------------------------------------------------------
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// addPathToQueue:notfyingAbout:
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// Tell this queue to listen for the specified notifications sent for
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// the object at the specified path.
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//
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// REVISIONS:
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// 2005-06-29 UK Files are now opened using O_EVTONLY instead of O_RDONLY
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// which allows ejecting or deleting watched files/folders.
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// Thanks to Phil Hargett for finding this flag in the docs.
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// 2004-03-13 UK Documented.
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// -----------------------------------------------------------------------------
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-(void) addPathToQueue: (NSString*)path notifyingAbout: (u_int)fflags
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{
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struct timespec nullts = { 0, 0 };
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struct kevent ev;
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int fd = open( [path fileSystemRepresentation], O_EVTONLY, 0 );
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if( fd >= 0 )
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{
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EV_SET( &ev, fd, EVFILT_VNODE,
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EV_ADD | EV_ENABLE | EV_CLEAR,
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fflags, 0, (void*)path );
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AT_SYNCHRONIZED( self )
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{
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[watchedPaths addObject: path];
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[watchedFDs addObject: [NSNumber numberWithInt: fd]];
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kevent( queueFD, &ev, 1, NULL, 0, &nullts );
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}
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}
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}
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-(void) removePath: (NSString*)path
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{
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[self removePathFromQueue: path];
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}
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// -----------------------------------------------------------------------------
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// removePathFromQueue:
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// Stop listening for changes to the specified path. This removes all
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// notifications. Use this to balance both addPathToQueue:notfyingAbout:
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// as well as addPathToQueue:.
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//
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// REVISIONS:
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// 2004-03-13 UK Documented.
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// -----------------------------------------------------------------------------
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-(void) removePathFromQueue: (NSString*)path
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{
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int index = 0;
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int fd = -1;
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AT_SYNCHRONIZED( self )
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{
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index = [watchedPaths indexOfObject: path];
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if( index == NSNotFound )
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return;
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fd = [[watchedFDs objectAtIndex: index] intValue];
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[watchedFDs removeObjectAtIndex: index];
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[watchedPaths removeObjectAtIndex: index];
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}
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if( close( fd ) == -1 )
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NSLog(@"removePathFromQueue: Couldn't close file descriptor (%d)", errno);
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}
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// -----------------------------------------------------------------------------
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// removeAllPathsFromQueue:
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// Stop listening for changes to all paths. This removes all
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// notifications.
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//
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// REVISIONS:
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// 2004-12-28 UK Added as suggested by bbum.
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// -----------------------------------------------------------------------------
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-(void) removeAllPathsFromQueue;
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{
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AT_SYNCHRONIZED( self )
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{
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NSEnumerator * fdEnumerator = [watchedFDs objectEnumerator];
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NSNumber * anFD;
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while( (anFD = [fdEnumerator nextObject]) != nil )
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close( [anFD intValue] );
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[watchedFDs removeAllObjects];
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[watchedPaths removeAllObjects];
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}
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}
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// -----------------------------------------------------------------------------
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// watcherThread:
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// This method is called by our NSThread to loop and poll for any file
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// changes that our kqueue wants to tell us about. This sends separate
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// notifications for the different kinds of changes that can happen.
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// All messages are sent via the postNotification:forFile: main bottleneck.
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//
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// This also calls sharedWorkspace's noteFileSystemChanged.
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//
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// To terminate this method (and its thread), set keepThreadRunning to NO.
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//
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// REVISIONS:
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// 2005-08-27 UK Changed to use keepThreadRunning instead of kqueueFD
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// being -1 as termination criterion, and to close the
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// queue in this thread so the main thread isn't blocked.
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// 2004-11-12 UK Fixed docs to include termination criterion, added
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// timeout to make sure the bugger gets disposed.
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// 2004-03-13 UK Documented.
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// -----------------------------------------------------------------------------
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-(void) watcherThread: (id)sender
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{
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int n;
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struct kevent ev;
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struct timespec timeout = { 5, 0 }; // 5 seconds timeout.
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int theFD = queueFD; // So we don't have to risk accessing iVars when the thread is terminated.
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while( keepThreadRunning )
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{
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NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
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NS_DURING
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n = kevent( queueFD, NULL, 0, &ev, 1, &timeout );
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if( n > 0 )
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{
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if( ev.filter == EVFILT_VNODE )
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{
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if( ev.fflags )
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{
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NSString* fpath = [[(NSString *)ev.udata retain] autorelease]; // In case one of the notified folks removes the path.
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//NSLog(@"UKKQueue: Detected file change: %@", fpath);
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[[NSWorkspace sharedWorkspace] noteFileSystemChanged: fpath];
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//NSLog(@"ev.flags = %u",ev.fflags); // DEBUG ONLY!
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if( (ev.fflags & NOTE_RENAME) == NOTE_RENAME )
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[self postNotification: UKFileWatcherRenameNotification forFile: fpath];
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if( (ev.fflags & NOTE_WRITE) == NOTE_WRITE )
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[self postNotification: UKFileWatcherWriteNotification forFile: fpath];
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if( (ev.fflags & NOTE_DELETE) == NOTE_DELETE )
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[self postNotification: UKFileWatcherDeleteNotification forFile: fpath];
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if( (ev.fflags & NOTE_ATTRIB) == NOTE_ATTRIB )
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[self postNotification: UKFileWatcherAttributeChangeNotification forFile: fpath];
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if( (ev.fflags & NOTE_EXTEND) == NOTE_EXTEND )
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[self postNotification: UKFileWatcherSizeIncreaseNotification forFile: fpath];
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if( (ev.fflags & NOTE_LINK) == NOTE_LINK )
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[self postNotification: UKFileWatcherLinkCountChangeNotification forFile: fpath];
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if( (ev.fflags & NOTE_REVOKE) == NOTE_REVOKE )
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[self postNotification: UKFileWatcherAccessRevocationNotification forFile: fpath];
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}
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}
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}
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NS_HANDLER
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NSLog(@"Error in UKKQueue watcherThread: %@",localException);
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NS_ENDHANDLER
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[pool release];
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}
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// Close our kqueue's file descriptor:
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if( close( theFD ) == -1 )
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NSLog(@"release: Couldn't close main kqueue (%d)", errno);
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//NSLog(@"exiting kqueue watcher thread.");
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}
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// -----------------------------------------------------------------------------
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// postNotification:forFile:
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// This is the main bottleneck for posting notifications. If you don't want
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// the notifications to go through NSWorkspace, override this method and
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// send them elsewhere.
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//
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// REVISIONS:
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// 2004-02-27 UK Changed this to send new notification, and the old one
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// only to objects that respond to it. The old category on
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// NSObject could cause problems with the proxy itself.
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// 2004-10-31 UK Helloween fun: Make this use a mainThreadProxy and
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// allow sending the notification even if we have a
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// delegate.
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// 2004-03-13 UK Documented.
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// -----------------------------------------------------------------------------
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-(void) postNotification: (NSString*)nm forFile: (NSString*)fp
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{
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if( delegateProxy )
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{
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#if UKKQUEUE_BACKWARDS_COMPATIBLE
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if( ![delegateProxy respondsToSelector: @selector(watcher:receivedNotification:forPath:)] )
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[delegateProxy kqueue: self receivedNotification: nm forFile: fp];
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else
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#endif
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[delegateProxy watcher: self receivedNotification: nm forPath: fp];
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}
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if( !delegateProxy || alwaysNotify )
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{
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#if UKKQUEUE_SEND_STUPID_NOTIFICATIONS
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[[[NSWorkspace sharedWorkspace] notificationCenter] postNotificationName: nm object: fp];
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#else
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[[[NSWorkspace sharedWorkspace] notificationCenter] postNotificationName: nm object: self
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userInfo: [NSDictionary dictionaryWithObjectsAndKeys: fp, @"path", nil]];
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#endif
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}
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}
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-(id) delegate
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{
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return delegate;
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}
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-(void) setDelegate: (id)newDelegate
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{
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id oldProxy = delegateProxy;
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delegate = newDelegate;
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delegateProxy = [delegate copyMainThreadProxy];
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[oldProxy release];
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}
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// -----------------------------------------------------------------------------
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// Flag to send a notification even if we have a delegate:
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// -----------------------------------------------------------------------------
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-(BOOL) alwaysNotify
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{
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return alwaysNotify;
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}
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-(void) setAlwaysNotify: (BOOL)n
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{
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alwaysNotify = n;
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}
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// -----------------------------------------------------------------------------
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// description:
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// This method can be used to help in debugging. It provides the value
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// used by NSLog & co. when you request to print this object using the
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// %@ format specifier.
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//
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// REVISIONS:
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// 2004-11-12 UK Created.
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// -----------------------------------------------------------------------------
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-(NSString*) description
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{
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return [NSString stringWithFormat: @"%@ { watchedPaths = %@, alwaysNotify = %@ }", NSStringFromClass([self class]), watchedPaths, (alwaysNotify? @"YES" : @"NO") ];
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}
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@end
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