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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

use ipc::IpcConfig;
use util::{H256, Bytes};

/// Represents what has to be handled by actor listening to chain events
pub trait ChainNotify: Send + Sync {
    /// fires when chain has new blocks.
    fn new_blocks(&self, _imported: Vec<H256>, _invalid: Vec<H256>,
                  _enacted: Vec<H256>, _retracted: Vec<H256>,
                  _sealed: Vec<H256>,

                      // Block bytes.
                      _proposed: Vec<Bytes>, _duration: u64) {
        // does nothing by default
    }

    /// fires when chain achieves active mode
    fn start(&self) {
        // does nothing by default
    }

    /// fires when chain achieves passive mode
    fn stop(&self) {
        // does nothing by default
    }

    /// fires when chain broadcasts a message
    fn broadcast(&self, _data: Vec<u8>) { }

    /// fires when new transactions are received from a peer
    fn transactions_received(&self, _hashes: Vec<H256>, _peer_id: usize) {
        // does nothing by default
    }
}

impl IpcConfig for ChainNotify { }