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    use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
    use super::super::types::{StorageRef, BlockHeight};

    // AtomicU32 is unstable => using AtomicUsize here

    /// Shared synchronization client state.
    /// It can be slightly innacurate, but the accuracy is not required for it
    #[derive(Debug)]
    pub struct SynchronizationState {
    	/// Is synchronization in progress?
    	is_synchronizing: AtomicBool,
    	/// Height of best block in the storage
    	best_storage_block_height: AtomicUsize,
    }

    impl SynchronizationState {
    	pub fn with_storage(storage: StorageRef) -> Self {
    		let best_storage_block_height = storage.best_block().number;
    		SynchronizationState {
    			is_synchronizing: AtomicBool::new(false),
    			best_storage_block_height: AtomicUsize::new(best_storage_block_height as usize),
    		}
    	}

    	pub fn synchronizing(&self) -> bool {
    		self.is_synchronizing.load(Ordering::SeqCst)
    	}

    	pub fn update_synchronizing(&self, synchronizing: bool) {
    		self.is_synchronizing.store(synchronizing, Ordering::SeqCst);
    	}

    	pub fn best_storage_block_height(&self) -> BlockHeight {
    		self.best_storage_block_height.load(Ordering::SeqCst) as BlockHeight
    	}

    	pub fn update_best_storage_block_height(&self, height: BlockHeight) {
    		self.best_storage_block_height.store(height as usize, Ordering::SeqCst);
    	}
    }

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