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use runtime::{Inner, Runtime};

use reactor::Reactor;

use std::io;

use tokio_reactor;
use tokio_threadpool::Builder as ThreadPoolBuilder;
use tokio_threadpool::park::DefaultPark;
use tokio_timer::clock::{self, Clock};
use tokio_timer::timer::{self, Timer};

/// Builds Tokio Runtime with custom configuration values.
///
/// Methods can be chained in order to set the configuration values. The
/// Runtime is constructed by calling [`build`].
///
/// New instances of `Builder` are obtained via [`Builder::new`].
///
/// See function level documentation for details on the various configuration
/// settings.
///
/// [`build`]: #method.build
/// [`Builder::new`]: #method.new
///
/// # Examples
///
/// ```
/// # extern crate tokio;
/// # extern crate tokio_threadpool;
/// # use tokio::runtime::Builder;
///
/// # pub fn main() {
/// // create and configure ThreadPool
/// let mut threadpool_builder = tokio_threadpool::Builder::new();
/// threadpool_builder
///     .name_prefix("my-runtime-worker-")
///     .pool_size(4);
///
/// // build Runtime
/// let runtime = Builder::new()
///     .threadpool_builder(threadpool_builder)
///     .build();
/// // ... call runtime.run(...)
/// # let _ = runtime;
/// # }
/// ```
#[derive(Debug)]
pub struct Builder {
    /// Thread pool specific builder
    threadpool_builder: ThreadPoolBuilder,

    /// The clock to use
    clock: Clock,
}

impl Builder {
    /// Returns a new runtime builder initialized with default configuration
    /// values.
    ///
    /// Configuration methods can be chained on the return value.
    pub fn new() -> Builder {
        let mut threadpool_builder = ThreadPoolBuilder::new();
        threadpool_builder.name_prefix("tokio-runtime-worker-");

        Builder {
            threadpool_builder,
            clock: Clock::new(),
        }
    }

    /// Set the `Clock` instance that will be used by the runtime.
    pub fn clock(&mut self, clock: Clock) -> &mut Self {
        self.clock = clock;
        self
    }

    /// Set builder to set up the thread pool instance.
    pub fn threadpool_builder(&mut self, val: ThreadPoolBuilder) -> &mut Self {
        self.threadpool_builder = val;
        self
    }

    /// Create the configured `Runtime`.
    ///
    /// The returned `ThreadPool` instance is ready to spawn tasks.
    ///
    /// # Examples
    ///
    /// ```
    /// # extern crate tokio;
    /// # use tokio::runtime::Builder;
    /// # pub fn main() {
    /// let runtime = Builder::new().build().unwrap();
    /// // ... call runtime.run(...)
    /// # let _ = runtime;
    /// # }
    /// ```
    pub fn build(&mut self) -> io::Result<Runtime> {
        use std::collections::HashMap;
        use std::sync::{Arc, Mutex};

        // Get a handle to the clock for the runtime.
        let clock1 = self.clock.clone();
        let clock2 = clock1.clone();

        let timers = Arc::new(Mutex::new(HashMap::<_, timer::Handle>::new()));
        let t1 = timers.clone();

        // Spawn a reactor on a background thread.
        let reactor = Reactor::new()?.background()?;

        // Get a handle to the reactor.
        let reactor_handle = reactor.handle().clone();

        let pool = self.threadpool_builder
            .around_worker(move |w, enter| {
                let timer_handle = t1.lock().unwrap()
                    .get(w.id()).unwrap()
                    .clone();

                tokio_reactor::with_default(&reactor_handle, enter, |enter| {
                    clock::with_default(&clock1, enter, |enter| {
                        timer::with_default(&timer_handle, enter, |_| {
                            w.run();
                        });
                    })
                });
            })
            .custom_park(move |worker_id| {
                // Create a new timer
                let timer = Timer::new_with_now(DefaultPark::new(), clock2.clone());

                timers.lock().unwrap()
                    .insert(worker_id.clone(), timer.handle());

                timer
            })
            .build();

        Ok(Runtime {
            inner: Some(Inner {
                reactor,
                pool,
            }),
        })
    }
}