VuoFileWatcher.hh

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#pragma once
 
#include <dispatch/dispatch.h>
 
class VuoFileWatcherDelegate
{
public:
    virtual void fileChanged(const string &fileBeingWatched) = 0;
};
 
class VuoFileWatcher
{
public:
    VuoFileWatcher(VuoFileWatcherDelegate *delegate, const string &fileToWatch, bool persistent=true);
    ~VuoFileWatcher();
 
private:
    VuoFileWatcher *parent;
    VuoFileWatcherDelegate *delegate;
    string fileToWatch;
    bool persistent;
    dispatch_queue_t queue;
 
    VuoFileWatcher(VuoFileWatcherDelegate *delegate, const string &fileToWatch, bool persistent, VuoFileWatcher *parent);
    void initialize(VuoFileWatcherDelegate *delegate, const string &fileToWatch, bool persistent, VuoFileWatcher *parent);
 
    void startWatching();
    int fileToWatchFD;
    dispatch_source_t fileToWatchSource;
    dispatch_group_t fileToWatchSourceRunning;
    bool reopen;
 
    void periodicallyCheckForExistence();
    dispatch_source_t periodicCheckForExistence;
    dispatch_group_t periodicCheckForExistenceRunning;
    static const double checkIntervalSeconds;
 
    void updateChildWatchers();
    vector<VuoFileWatcher *> childWatchers;
    dispatch_queue_t childWatchersQueue;
 
    void changeObserved();
    dispatch_source_t changeNotificationDelay;
    dispatch_group_t changeNotificationDelayRunning;
    static const double changeNotificationDelaySeconds;
};