DirectoryWatcher now notifies if file count has changed in a directory

src/MediaServer/DirectoryWatcher.cpp

@@ -4,8 +4,9 @@ namespace ofx {
 namespace piMapper {
 
 DirectoryWatcher::DirectoryWatcher(string path, int watcherMediaType){
+	directoryPath = path;
 	_mediaType = watcherMediaType;
-	
+
 	if(_mediaType == SourceType::SOURCE_TYPE_VIDEO){
 		_directory.allowExt("mp4");
 		_directory.allowExt("h264");
@@ -21,20 +22,27 @@ DirectoryWatcher::DirectoryWatcher(string path, int watcherMediaType){
 		ofLogFatalError("DirectoryWatcher::DirectoryWatcher", "Unkonwn media type");
 		exit(EXIT_FAILURE);
 	}
-	
-	_directory.listDir(path);
+
+	_directory.listDir(directoryPath);
 	_directory.sort();
-	
+
 	for(int i = 0; i < _directory.size(); ++i){
-		_filePaths.push_back(path + _directory.getName(i));
-		
-		ofFile file(path + _directory.getName(i));
+		_filePaths.push_back(directoryPath + _directory.getName(i));
+
+		ofFile file(directoryPath + _directory.getName(i));
 		if(_mediaType == SourceType::SOURCE_TYPE_VIDEO){
 			file.copyTo("sources/videos/" + _directory.getName(i));
 		}else if(_mediaType == SourceType::SOURCE_TYPE_IMAGE){
 			file.copyTo("sources/images/" + _directory.getName(i));
 		}
 	}
+
+	dirSize = _directory.size();
+}
+
+DirectoryWatcher::~DirectoryWatcher() {
+	endWatch();
+//	waitForThread(false);
 }
 
 vector <string> & DirectoryWatcher::getFilePaths(){
@@ -45,5 +53,28 @@ int DirectoryWatcher::getMediaType(){
 	return _mediaType;
 }
 
+void DirectoryWatcher::beginWatch(int intervalInMillis) {
+	watchInterval = intervalInMillis;
+	startThread();
+}
+
+void DirectoryWatcher::endWatch() {
+	stopThread();
+}
+
+void DirectoryWatcher::threadedFunction() {
+
+	while (isThreadRunning()) {
+
+		int newSize = _directory.listDir();
+		if (newSize != dirSize) {
+			ofLogVerbose("DirectoryWatcher") << "Directory changed";
+			ofNotifyEvent(directoryFileCountChangedEvent, this);
+		}
+
+		sleep(watchInterval);
+	}
+}
+
 } // namespace piMapper
 } // namespace ofx

src/MediaServer/DirectoryWatcher.h

@@ -6,16 +6,32 @@
 namespace ofx {
 namespace piMapper {
 
-class DirectoryWatcher {
+class DirectoryWatcher : public ofThread {
 	public:
 		DirectoryWatcher(string path, int watcherMediaType);
+		virtual ~DirectoryWatcher();
 		vector<string> & getFilePaths();
 		int getMediaType();
 
+		void beginWatch(int intervalInMillis = 5000);
+		void endWatch();
+		void threadedFunction();
+
+		/**
+		 * Triggered when the file count of a directory increases
+		 * or decreases.
+		 *
+		 * Sender is a pointer to this DirectoryWatcher
+		 */
+		ofEvent<void> directoryFileCountChangedEvent;
 	private:
 		ofDirectory _directory;
 		vector<string> _filePaths;
+		std::string directoryPath;
 		int _mediaType;
+
+		int dirSize;
+		long watchInterval; // in millis.
 };
 
 } // namespace piMapper

src/MediaServer/MediaServer.cpp

@@ -19,14 +19,17 @@ MediaServer::MediaServer():
 {
 	// By initialising all above we also copy files from external media
 	// to the ofxPiMapper storage.
-	
-	imageWatcher = DirectoryWatcher(
-		ofToDataPath(DEFAULT_IMAGES_DIR, true),
-		SourceType::SOURCE_TYPE_IMAGE);
-	
-	videoWatcher = DirectoryWatcher(
-		ofToDataPath(DEFAULT_VIDEOS_DIR, true),
-		SourceType::SOURCE_TYPE_VIDEO);
+	imageWatcher.beginWatch();
+
+
+//	imageWatcher = DirectoryWatcher(
+//		ofToDataPath(DEFAULT_IMAGES_DIR, true),
+//		SourceType::SOURCE_TYPE_IMAGE);
+//	imageWatcher.beginWatch();
+//
+//	videoWatcher = DirectoryWatcher(
+//		ofToDataPath(DEFAULT_VIDEOS_DIR, true),
+//		SourceType::SOURCE_TYPE_VIDEO);
 }
 
 void MediaServer::setup(){