/*

    Copyright (C) 2015 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    This is the "FileTreeWatcherThread" class declaration.

*/

#import <Cocoa/Cocoa.h>

#import <CoreServices/CoreServices.h>

@interface AAPLFileTreeWatcherThread : NSThread

{

    NSArray *paths;                 // array of paths we're watching (as NSStrings)

    void (^handler)(void);          // the block to invoke when we sense a change

    FSEventStreamRef fsEventStream; // the FSEventStream that's informing us of changes

}

/*

    Creates a new AAPLFileTreeWatcherThread that monitors the file subtree

    specified by the given path, and invokes the given "changeHandler" block

    each time a change in the file subtree is detected.

    Send -start to the returned instance to start watching the file system.

    Send -cancel to stop.

    (AAPLFileTreeWatcherThread inherits these API methods from NSThread.)

*/

- initWithPath:(NSString *)pathToWatch changeHandler:(void (^)(void))changeHandler;

/*

    Invoked by AAPLFileTreeWatcherThread to schedule main-thread invocation of

    its changeHandler.

*/

- (void)invokeChangeHandler;

/*

    Invoke this to zero out the thread's "changeHandler" pointer when things it

    operates on are about to go away.  (Sending -cancel to the thread isn't

    sufficient to ensure that it won't invoke its "changeHandler" one more

    time.)

*/

- (void)detachChangeHandler;

@end