StorageManager.cpp

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#include <StorageManager.h>

StorageManagerException::StorageManagerException(const std::string & _message):
    message(_message) {
}
const char* StorageManagerException::what() const throw() {
    return message.c_str();
}

StorageManagerException::~StorageManagerException() throw() {

}

NoStorageLocationGiven::NoStorageLocationGiven():
    StorageManagerException("At least one storage location has to be given!") {
}

NoStorageLocationGiven::~NoStorageLocationGiven() throw() {}

NoSpaceLeftOnStorage::NoSpaceLeftOnStorage():
    StorageManagerException("No storage device was found with more than the given threshold of free space!") {
}

NoSpaceLeftOnStorage::~NoSpaceLeftOnStorage() throw() {}

StorageManager::StorageManager(double minFreeThreshold_):
    minFreeThreshold(minFreeThreshold_) {
}

void StorageManager::addStorageLocation(const std::string & path) {
    storageLocations.emplace_back(path);
    if (storageLocations.size() == 1) {
        currentLocation = storageLocations.begin();
    }
}

std::string StorageManager::getPreferredStorageLocation() {
    if (storageLocations.empty()) {
        throw NoStorageLocationGiven();
    }
    double currentFree = systemHelper.getDiskFreePercent(*currentLocation);
    if (currentFree >= minFreeThreshold) {
        return *currentLocation;
    }
    for(auto it = storageLocations.begin(); it != storageLocations.end(); ++it) {
        double thisFree = systemHelper.getDiskFreePercent(*it);
        if (thisFree > currentFree) {
            currentFree = thisFree;
            currentLocation = it;
        }
    }
    if (currentFree >= minFreeThreshold) {
        return *currentLocation;
    }
    throw NoSpaceLeftOnStorage();
}