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    use std::sync::Arc;
    use futures::Future;
    use parking_lot::{Mutex, RwLock};
    use storage;
    use local_node::LocalNode;
    use miner::MemoryPool;
    use super::SyncListener;
    use synchronization_client::SynchronizationClient;
    use synchronization_executor::LocalSynchronizationTaskExecutor;
    use synchronization_peers::Peers;
    use synchronization_server::ServerImpl;
    use synchronization_verifier::AsyncVerifier;
    use utils::SynchronizationState;

    pub use utils::BlockHeight;

    /// Network request id
    pub type RequestId = u32;

    /// Peer is indexed using this type
    pub type PeerIndex = usize;

    // No-error, no-result future
    pub type EmptyBoxFuture = Box<Future<Item=(), Error=()> + Send>;

    /// Reference to storage
    pub type StorageRef = storage::SharedStore;

    /// Reference to memory pool
    pub type MemoryPoolRef = Arc<RwLock<MemoryPool>>;

    /// Shared synchronization state reference
    pub type SynchronizationStateRef = Arc<SynchronizationState>;

    /// Reference to peers
    pub type PeersRef = Arc<Peers>;

    /// Reference to synchronization tasks executor
    pub type ExecutorRef<T> = Arc<T>;

    /// Reference to synchronization client
    pub type ClientRef<T> = Arc<T>;

    /// Reference to synchronization client core
    pub type ClientCoreRef<T> = Arc<Mutex<T>>;

    /// Reference to synchronization server
    pub type ServerRef<T> = Arc<T>;

    /// Reference to local node
    pub type LocalNodeRef = Arc<LocalNode<LocalSynchronizationTaskExecutor, ServerImpl, SynchronizationClient<LocalSynchronizationTaskExecutor, AsyncVerifier>>>;

    /// Synchronization events listener reference
    pub type SyncListenerRef = Box<SyncListener>;

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