ObserverRegistry.h

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#ifndef CARMA_UTIL_OBSERVERREGISTRY_H
#define CARMA_UTIL_OBSERVERREGISTRY_H


#include "carma/util/PthreadMutex.h"
#include <vector>

  
namespace carma {
    namespace util {
    
class Observer;  // forward declaration
    
class ObserverRegistry {
public:

    static ObserverRegistry& instance();
    
    virtual ~ObserverRegistry();
   
    int registerObserver();

    void unregisterObserver(int registrationId);

    int getNumObservers();

    std::vector<int> registryIds();

    std::string registryToString();

    void lock();

    void unlock();

    bool isRegistered(int regID);

private:
    /*
     * Constructor; private so can only be created by instance method
     */
    ObserverRegistry();
    
    std::vector<int> registry_;
    int nextRegistrationId_;
    PthreadMutex registryGuard_;

};

} }  // End namespace carma::util 



#endif  // CARMA_UTIL_OBSERVERREGISTRY_H