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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/>.

    //! Performance timer with logging
    use time::precise_time_ns;

    /// Performance timer with logging. Starts measuring time in the constructor, prints
    /// elapsed time in the destructor or when `stop` is called.
    pub struct PerfTimer {
    	name: &'static str,
    	start: u64,
    	stopped: bool,
    }

    impl PerfTimer {
    	/// Create an instance with given name.
    	pub fn new(name: &'static str) -> PerfTimer {
    		PerfTimer {
    			name: name,
    			start: precise_time_ns(),
    			stopped: false,
    		}
    	}

    	/// Stop the timer and print elapsed time on trace level with `perf` target.
    	pub fn stop(&mut self) {
    		if !self.stopped {
    			trace!(target: "perf", "{}: {:.2}ms", self.name, (precise_time_ns()  - self.start) as f32 / 1000_000.0);
    			self.stopped = true;
    		}
    	}
    }

    impl Drop for PerfTimer {
    	fn drop(&mut self) {
    		self.stop()
    	}
    }

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