// WARNING: This file is machine generated by fidlgen.

// fidl_experiment = no_optional_structs
// fidl_experiment = simple_empty_response_syntax
// fidl_experiment = unknown_interactions

#![allow(
    unused_parens, // one-element-tuple-case is not a tuple
    unused_mut, // not all args require mutation, but many do
    nonstandard_style, // auto-caps does its best, but is not always successful
)]
#![recursion_limit = "512"]

#[cfg(target_os = "fuchsia")]
#[allow(unused_imports)]
use fuchsia_zircon as zx;

#[allow(unused_imports)]
use {
    bitflags::bitflags,
    fidl::{
        client::{decode_transaction_body_fut, QueryResponseFut},
        encoding::{zerocopy, Decodable as _, Encodable as _},
        endpoints::{ControlHandle as _, Responder as _},
        fidl_bits, fidl_empty_struct, fidl_enum, fidl_struct, fidl_struct_copy, fidl_table,
        fidl_union, wrap_handle_metadata,
    },
    fuchsia_zircon_status as zx_status,
    futures::future::{self, MaybeDone, TryFutureExt},
};

const _FIDL_TRACE_BINDINGS_RUST: u32 = 6;

/// Indicates the memory pressure level.
#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
#[repr(u32)]
pub enum Level {
    /// The memory pressure level is healthy.
    ///
    /// Registered clients are free to hold on to caches and allocate memory
    /// unrestricted.
    ///
    /// However, clients should take care to not proactively re-create caches on a
    /// transition back to the NORMAL level, causing a memory spike that immediately
    /// pushes the level over to WARNING again.
    Normal = 1,
    /// The memory pressure level is somewhat constrained, and might cross over to
    /// the critical pressure range if left unchecked.
    ///
    /// Registered clients are expected to optimize their operation to limit memory
    /// usage, rather than for best performance, for example, by reducing cache sizes
    /// and non-essential memory allocations.
    ///
    /// Clients must take care to regulate the amount of work they undertake in
    /// order to reclaim memory, and ensure that it does not cause visible
    /// performance degradation. There exists some memory pressure, but not enough
    /// to justify trading off user responsiveness to reclaim memory.
    Warning = 2,
    /// The memory pressure level is very constrained.
    ///
    /// Registered clients are expected to drop all non-essential memory, and refrain
    /// from allocating more memory. Failing to do so might result in the job
    /// getting terminated, or the system being rebooted in the case of global
    /// memory pressure.
    ///
    /// Clients may undertake expensive work to reclaim memory if required, since
    /// failing to do so might result in termination. The client might decide that a
    /// performance hit is a fair tradeoff in this case.
    Critical = 3,
}

impl Level {
    #[inline]
    pub fn from_primitive(prim: u32) -> Option<Self> {
        match prim {
            1 => Some(Self::Normal),
            2 => Some(Self::Warning),
            3 => Some(Self::Critical),
            _ => None,
        }
    }

    #[inline]
    pub const fn into_primitive(self) -> u32 {
        self as u32
    }

    #[deprecated = "Strict enums should not use `is_unknown`"]
    #[inline]
    pub fn is_unknown(&self) -> bool {
        false
    }
}

fidl_enum! {
    name: Level,
    prim_ty: u32,
    strict: true,
    min_member: Normal,
}

wrap_handle_metadata!(
    HandleWrapperObjectTypeCHANNELRightsCHANNEL_DEFAULT,
    fidl::ObjectType::CHANNEL,
    fidl::Rights::CHANNEL_DEFAULT
);

#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct ProviderMarker;

impl fidl::endpoints::ProtocolMarker for ProviderMarker {
    type Proxy = ProviderProxy;
    type RequestStream = ProviderRequestStream;
    const DEBUG_NAME: &'static str = "fuchsia.memorypressure.Provider";
}
impl fidl::endpoints::DiscoverableProtocolMarker for ProviderMarker {}

pub trait ProviderProxyInterface: Send + Sync {
    fn r#register_watcher(
        &self,
        watcher: fidl::endpoints::ClientEnd<WatcherMarker>,
    ) -> Result<(), fidl::Error>;
}

#[derive(Debug)]
#[cfg(target_os = "fuchsia")]
pub struct ProviderSynchronousProxy {
    client: fidl::client::sync::Client,
}

#[cfg(target_os = "fuchsia")]
impl ProviderSynchronousProxy {
    pub fn new(channel: fidl::Channel) -> Self {
        let protocol_name = <ProviderMarker as fidl::endpoints::ProtocolMarker>::DEBUG_NAME;
        Self { client: fidl::client::sync::Client::new(channel, protocol_name) }
    }

    pub fn into_channel(self) -> fidl::Channel {
        self.client.into_channel()
    }

    /// Waits until an event arrives and returns it. It is safe for other
    /// threads to make concurrent requests while waiting for an event.
    pub fn wait_for_event(&self, deadline: zx::Time) -> Result<ProviderEvent, fidl::Error> {
        ProviderEvent::decode(self.client.wait_for_event(deadline)?)
    }
    /// Used to register for memory pressure level changes.
    /// `watcher`: memory pressure `Watcher` channel that the `Provider` will use to send
    /// level change messages to the client.
    ///
    /// The current memory pressure level is immediately sent to the watcher
    /// when this method is called.
    ///
    /// It is recommended that the root job in a component tree register for changes,
    /// rather than having individual jobs further down the tree register individually.
    /// A low client count will help minimize system churn due to a large number of
    /// memory pressure messages in transit at the same time.
    /// Also, the more context a job has, the better equipped it will be to react to
    /// memory pressure by controlling the behavior of children jobs in its tree.
    pub fn r#register_watcher(
        &self,
        mut watcher: fidl::endpoints::ClientEnd<WatcherMarker>,
    ) -> Result<(), fidl::Error> {
        self.client.send::<_, false>(
            &mut (HandleWrapperObjectTypeCHANNELRightsCHANNEL_DEFAULT::<
                fidl::endpoints::ClientEnd<WatcherMarker>,
            >(watcher),),
            0x91e65af25aae4a9,
            fidl::encoding::DynamicFlags::empty(),
        )
    }
}

#[derive(Debug, Clone)]
pub struct ProviderProxy {
    client: fidl::client::Client,
}

impl fidl::endpoints::Proxy for ProviderProxy {
    type Protocol = ProviderMarker;

    fn from_channel(inner: fidl::AsyncChannel) -> Self {
        Self::new(inner)
    }

    fn into_channel(self) -> Result<::fidl::AsyncChannel, Self> {
        self.client.into_channel().map_err(|client| Self { client })
    }

    fn as_channel(&self) -> &::fidl::AsyncChannel {
        self.client.as_channel()
    }
}

impl ProviderProxy {
    /// Create a new Proxy for Provider
    pub fn new(channel: fidl::AsyncChannel) -> Self {
        let protocol_name = <ProviderMarker as fidl::endpoints::ProtocolMarker>::DEBUG_NAME;
        Self { client: fidl::client::Client::new(channel, protocol_name) }
    }

    /// Get a Stream of events from the remote end of the Provider protocol
    ///
    /// # Panics
    ///
    /// Panics if the event stream was already taken.
    pub fn take_event_stream(&self) -> ProviderEventStream {
        ProviderEventStream { event_receiver: self.client.take_event_receiver() }
    }
    /// Used to register for memory pressure level changes.
    /// `watcher`: memory pressure `Watcher` channel that the `Provider` will use to send
    /// level change messages to the client.
    ///
    /// The current memory pressure level is immediately sent to the watcher
    /// when this method is called.
    ///
    /// It is recommended that the root job in a component tree register for changes,
    /// rather than having individual jobs further down the tree register individually.
    /// A low client count will help minimize system churn due to a large number of
    /// memory pressure messages in transit at the same time.
    /// Also, the more context a job has, the better equipped it will be to react to
    /// memory pressure by controlling the behavior of children jobs in its tree.
    pub fn r#register_watcher(
        &self,
        mut watcher: fidl::endpoints::ClientEnd<WatcherMarker>,
    ) -> Result<(), fidl::Error> {
        ProviderProxyInterface::r#register_watcher(self, watcher)
    }
}

impl ProviderProxyInterface for ProviderProxy {
    fn r#register_watcher(
        &self,
        mut watcher: fidl::endpoints::ClientEnd<WatcherMarker>,
    ) -> Result<(), fidl::Error> {
        self.client.send::<_, false>(
            &mut (HandleWrapperObjectTypeCHANNELRightsCHANNEL_DEFAULT::<
                fidl::endpoints::ClientEnd<WatcherMarker>,
            >(watcher)),
            0x91e65af25aae4a9,
            fidl::encoding::DynamicFlags::empty(),
        )
    }
}

pub struct ProviderEventStream {
    event_receiver: fidl::client::EventReceiver,
}

impl std::marker::Unpin for ProviderEventStream {}

impl futures::stream::FusedStream for ProviderEventStream {
    fn is_terminated(&self) -> bool {
        self.event_receiver.is_terminated()
    }
}

impl futures::Stream for ProviderEventStream {
    type Item = Result<ProviderEvent, fidl::Error>;

    fn poll_next(
        mut self: std::pin::Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Option<Self::Item>> {
        let buf = match futures::ready!(futures::stream::StreamExt::poll_next_unpin(
            &mut self.event_receiver,
            cx
        )?) {
            Some(buf) => buf,
            None => return std::task::Poll::Ready(None),
        };

        std::task::Poll::Ready(Some(ProviderEvent::decode(buf)))
    }
}

#[derive(Debug)]
pub enum ProviderEvent {}

impl ProviderEvent {
    /// Decodes a message buffer as a [`ProviderEvent`]. Transaction
    /// ID in the message must be zero; this method does not check TXID.
    fn decode(mut buf: fidl::MessageBufEtc) -> Result<ProviderEvent, fidl::Error> {
        let (bytes, _handles) = buf.split_mut();
        let (tx_header, _body_bytes) = fidl::encoding::decode_transaction_header(bytes)?;

        match tx_header.ordinal() {
            _ => Err(fidl::Error::UnknownOrdinal {
                ordinal: tx_header.ordinal(),
                protocol_name: <ProviderMarker as fidl::endpoints::ProtocolMarker>::DEBUG_NAME,
            }),
        }
    }
}

/// A Stream of incoming requests for Provider
pub struct ProviderRequestStream {
    inner: std::sync::Arc<fidl::ServeInner>,
    is_terminated: bool,
}

impl std::marker::Unpin for ProviderRequestStream {}

impl futures::stream::FusedStream for ProviderRequestStream {
    fn is_terminated(&self) -> bool {
        self.is_terminated
    }
}

impl fidl::endpoints::RequestStream for ProviderRequestStream {
    type Protocol = ProviderMarker;
    type ControlHandle = ProviderControlHandle;

    fn from_channel(channel: fidl::AsyncChannel) -> Self {
        Self { inner: std::sync::Arc::new(fidl::ServeInner::new(channel)), is_terminated: false }
    }

    fn control_handle(&self) -> Self::ControlHandle {
        ProviderControlHandle { inner: self.inner.clone() }
    }

    fn into_inner(self) -> (::std::sync::Arc<fidl::ServeInner>, bool) {
        (self.inner, self.is_terminated)
    }

    fn from_inner(inner: std::sync::Arc<fidl::ServeInner>, is_terminated: bool) -> Self {
        Self { inner, is_terminated }
    }
}

impl futures::Stream for ProviderRequestStream {
    type Item = Result<ProviderRequest, fidl::Error>;

    fn poll_next(
        mut self: std::pin::Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Option<Self::Item>> {
        let this = &mut *self;
        if this.inner.poll_shutdown(cx) {
            this.is_terminated = true;
            return std::task::Poll::Ready(None);
        }
        if this.is_terminated {
            panic!("polled ProviderRequestStream after completion");
        }
        fidl::encoding::with_tls_decode_buf(|bytes, handles| {
            match this.inner.channel().read_etc(cx, bytes, handles) {
                std::task::Poll::Ready(Ok(())) => {}
                std::task::Poll::Pending => return std::task::Poll::Pending,
                std::task::Poll::Ready(Err(zx_status::Status::PEER_CLOSED)) => {
                    this.is_terminated = true;
                    return std::task::Poll::Ready(None);
                }
                std::task::Poll::Ready(Err(e)) => {
                    return std::task::Poll::Ready(Some(Err(fidl::Error::ServerRequestRead(e))))
                }
            }

            // A message has been received from the channel
            let (header, _body_bytes) = fidl::encoding::decode_transaction_header(bytes)?;
            if !header.is_compatible() {
                return std::task::Poll::Ready(Some(Err(fidl::Error::IncompatibleMagicNumber(
                    header.magic_number(),
                ))));
            }

            std::task::Poll::Ready(Some(match header.ordinal() {
                0x91e65af25aae4a9 => {
                    let mut req: (
                        HandleWrapperObjectTypeCHANNELRightsCHANNEL_DEFAULT<
                            fidl::endpoints::ClientEnd<WatcherMarker>,
                        >,
                    ) = fidl::encoding::Decodable::new_empty();
                    fidl::duration_begin!("fidl", "decode", "bindings" => _FIDL_TRACE_BINDINGS_RUST, "name" => "fuchsia.memorypressure/ProviderRegisterWatcherRequest");
                    fidl::trace_blob!("fidl:blob", "decode", bytes);
                    if header.dynamic_flags().contains(fidl::encoding::DynamicFlags::BYTE_OVERFLOW)
                    {
                        Err(fidl::Error::LargeMessageImpossible)?;
                    }
                    fidl::encoding::Decoder::decode_into(&header, _body_bytes, handles, &mut req)?;
                    fidl::duration_end!("fidl", "decode", "bindings" => _FIDL_TRACE_BINDINGS_RUST, "size" => bytes.len() as u32, "handle_count" => handles.len() as u32);
                    let control_handle = ProviderControlHandle { inner: this.inner.clone() };

                    Ok(ProviderRequest::RegisterWatcher {
                        watcher: req.0.into_inner(),
                        control_handle,
                    })
                }
                _ => Err(fidl::Error::UnknownOrdinal {
                    ordinal: header.ordinal(),
                    protocol_name: <ProviderMarker as fidl::endpoints::ProtocolMarker>::DEBUG_NAME,
                }),
            }))
        })
    }
}
/// Registration protocol
#[derive(Debug)]
pub enum ProviderRequest {
    /// Used to register for memory pressure level changes.
    /// `watcher`: memory pressure `Watcher` channel that the `Provider` will use to send
    /// level change messages to the client.
    ///
    /// The current memory pressure level is immediately sent to the watcher
    /// when this method is called.
    ///
    /// It is recommended that the root job in a component tree register for changes,
    /// rather than having individual jobs further down the tree register individually.
    /// A low client count will help minimize system churn due to a large number of
    /// memory pressure messages in transit at the same time.
    /// Also, the more context a job has, the better equipped it will be to react to
    /// memory pressure by controlling the behavior of children jobs in its tree.
    RegisterWatcher {
        watcher: fidl::endpoints::ClientEnd<WatcherMarker>,
        control_handle: ProviderControlHandle,
    },
}

impl ProviderRequest {
    #[allow(irrefutable_let_patterns)]
    pub fn into_register_watcher(
        self,
    ) -> Option<(fidl::endpoints::ClientEnd<WatcherMarker>, ProviderControlHandle)> {
        if let ProviderRequest::RegisterWatcher { watcher, control_handle } = self {
            Some((watcher, control_handle))
        } else {
            None
        }
    }

    /// Name of the method defined in FIDL
    pub fn method_name(&self) -> &'static str {
        match *self {
            ProviderRequest::RegisterWatcher { .. } => "register_watcher",
        }
    }
}

#[derive(Debug, Clone)]
pub struct ProviderControlHandle {
    inner: std::sync::Arc<fidl::ServeInner>,
}

impl fidl::endpoints::ControlHandle for ProviderControlHandle {
    fn shutdown(&self) {
        self.inner.shutdown()
    }

    fn shutdown_with_epitaph(&self, status: zx_status::Status) {
        self.inner.shutdown_with_epitaph(status)
    }

    fn is_closed(&self) -> bool {
        self.inner.channel().is_closed()
    }

    fn on_closed<'a>(&'a self) -> fidl::OnSignals<'a> {
        self.inner.channel().on_closed()
    }
}

impl ProviderControlHandle {}

#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct WatcherMarker;

impl fidl::endpoints::ProtocolMarker for WatcherMarker {
    type Proxy = WatcherProxy;
    type RequestStream = WatcherRequestStream;
    const DEBUG_NAME: &'static str = "(anonymous) Watcher";
}

pub trait WatcherProxyInterface: Send + Sync {
    type OnLevelChangedResponseFut: std::future::Future<Output = Result<(), fidl::Error>> + Send;
    fn r#on_level_changed(&self, level: Level) -> Self::OnLevelChangedResponseFut;
}

#[derive(Debug)]
#[cfg(target_os = "fuchsia")]
pub struct WatcherSynchronousProxy {
    client: fidl::client::sync::Client,
}

#[cfg(target_os = "fuchsia")]
impl WatcherSynchronousProxy {
    pub fn new(channel: fidl::Channel) -> Self {
        let protocol_name = <WatcherMarker as fidl::endpoints::ProtocolMarker>::DEBUG_NAME;
        Self { client: fidl::client::sync::Client::new(channel, protocol_name) }
    }

    pub fn into_channel(self) -> fidl::Channel {
        self.client.into_channel()
    }

    /// Waits until an event arrives and returns it. It is safe for other
    /// threads to make concurrent requests while waiting for an event.
    pub fn wait_for_event(&self, deadline: zx::Time) -> Result<WatcherEvent, fidl::Error> {
        WatcherEvent::decode(self.client.wait_for_event(deadline)?)
    }
    /// Sent to the registered client when the memory pressure level changes.
    /// `level`: indicates the current memory pressure level.
    ///
    /// Will also be invoked on initial connection via `RegisterWatcher`, so that a newly
    /// registered client can discover the current memory pressure level.
    ///
    /// The watcher must immediately reply with a message to acknowledge that it has
    /// received the level change notification, and has initiated required actions as a
    /// result. It may then continue to reclaim memory asynchronously after sending
    /// the acknowledgement.
    ///
    /// Some helpful guidelines for clients:
    /// 1. The watcher will be notified of new pressure level changes only after a reply
    /// corresponding to the previous message has been received by the provider.
    /// If multiple level transitions occur during that time, the watcher will be
    /// notified of the latest pressure level.
    ///
    /// 2. The level changes are edge-triggered, and clients are expected to maintain
    /// local state to track the current pressure level, if required. For example,
    /// a job might be notified of a CRITICAL level and drop all its caches as a result.
    /// Some time after this, it might want to trigger an activity that causes a
    /// fair amount of memory to be allocated. At this point, the job is expected to
    /// remember that the last pressure level it saw was CRITICAL, and refrain from
    /// triggering the memory-intensive activity.
    ///
    /// 3. As a performance optimization, the provider may decide to skip sending
    /// messages for some pressure level changes. For example, when oscillating across
    /// the NORMAL / WARNING boundary, it might not be worth notifying clients of every
    /// single transition. The provider might rate-limit messages in this case.
    /// On a similar note, the provider may decide to send repeated messages at the
    /// same pressure level, particularly CRITICAL, to indicate that further action
    /// needs to be taken.
    pub fn r#on_level_changed(
        &self,
        mut level: Level,
        ___deadline: zx::Time,
    ) -> Result<(), fidl::Error> {
        let _value: () = self.client.send_query::<_, _, false, false>(
            &mut (level),
            0x55d559533407fed9,
            fidl::encoding::DynamicFlags::empty(),
            ___deadline,
        )?;
        Ok(())
    }
}

#[derive(Debug, Clone)]
pub struct WatcherProxy {
    client: fidl::client::Client,
}

impl fidl::endpoints::Proxy for WatcherProxy {
    type Protocol = WatcherMarker;

    fn from_channel(inner: fidl::AsyncChannel) -> Self {
        Self::new(inner)
    }

    fn into_channel(self) -> Result<::fidl::AsyncChannel, Self> {
        self.client.into_channel().map_err(|client| Self { client })
    }

    fn as_channel(&self) -> &::fidl::AsyncChannel {
        self.client.as_channel()
    }
}

impl WatcherProxy {
    /// Create a new Proxy for Watcher
    pub fn new(channel: fidl::AsyncChannel) -> Self {
        let protocol_name = <WatcherMarker as fidl::endpoints::ProtocolMarker>::DEBUG_NAME;
        Self { client: fidl::client::Client::new(channel, protocol_name) }
    }

    /// Get a Stream of events from the remote end of the Watcher protocol
    ///
    /// # Panics
    ///
    /// Panics if the event stream was already taken.
    pub fn take_event_stream(&self) -> WatcherEventStream {
        WatcherEventStream { event_receiver: self.client.take_event_receiver() }
    }
    /// Sent to the registered client when the memory pressure level changes.
    /// `level`: indicates the current memory pressure level.
    ///
    /// Will also be invoked on initial connection via `RegisterWatcher`, so that a newly
    /// registered client can discover the current memory pressure level.
    ///
    /// The watcher must immediately reply with a message to acknowledge that it has
    /// received the level change notification, and has initiated required actions as a
    /// result. It may then continue to reclaim memory asynchronously after sending
    /// the acknowledgement.
    ///
    /// Some helpful guidelines for clients:
    /// 1. The watcher will be notified of new pressure level changes only after a reply
    /// corresponding to the previous message has been received by the provider.
    /// If multiple level transitions occur during that time, the watcher will be
    /// notified of the latest pressure level.
    ///
    /// 2. The level changes are edge-triggered, and clients are expected to maintain
    /// local state to track the current pressure level, if required. For example,
    /// a job might be notified of a CRITICAL level and drop all its caches as a result.
    /// Some time after this, it might want to trigger an activity that causes a
    /// fair amount of memory to be allocated. At this point, the job is expected to
    /// remember that the last pressure level it saw was CRITICAL, and refrain from
    /// triggering the memory-intensive activity.
    ///
    /// 3. As a performance optimization, the provider may decide to skip sending
    /// messages for some pressure level changes. For example, when oscillating across
    /// the NORMAL / WARNING boundary, it might not be worth notifying clients of every
    /// single transition. The provider might rate-limit messages in this case.
    /// On a similar note, the provider may decide to send repeated messages at the
    /// same pressure level, particularly CRITICAL, to indicate that further action
    /// needs to be taken.
    pub fn r#on_level_changed(&self, mut level: Level) -> fidl::client::QueryResponseFut<()> {
        WatcherProxyInterface::r#on_level_changed(self, level)
    }
}

impl WatcherProxyInterface for WatcherProxy {
    type OnLevelChangedResponseFut = fidl::client::QueryResponseFut<()>;
    fn r#on_level_changed(&self, mut level: Level) -> Self::OnLevelChangedResponseFut {
        fn transform(result: Result<(), fidl::Error>) -> Result<(), fidl::Error> {
            result.map(|_value| ())
        }
        let send_result = self.client.call_send_raw_query::<_, false>(
            &mut (level),
            0x55d559533407fed9,
            fidl::encoding::DynamicFlags::empty(),
        );
        QueryResponseFut(match send_result {
            Ok(res_fut) => future::maybe_done(
                res_fut.and_then(|buf| decode_transaction_body_fut::<_, _, false>(buf, transform)),
            ),
            Err(e) => MaybeDone::Done(Err(e)),
        })
    }
}

pub struct WatcherEventStream {
    event_receiver: fidl::client::EventReceiver,
}

impl std::marker::Unpin for WatcherEventStream {}

impl futures::stream::FusedStream for WatcherEventStream {
    fn is_terminated(&self) -> bool {
        self.event_receiver.is_terminated()
    }
}

impl futures::Stream for WatcherEventStream {
    type Item = Result<WatcherEvent, fidl::Error>;

    fn poll_next(
        mut self: std::pin::Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Option<Self::Item>> {
        let buf = match futures::ready!(futures::stream::StreamExt::poll_next_unpin(
            &mut self.event_receiver,
            cx
        )?) {
            Some(buf) => buf,
            None => return std::task::Poll::Ready(None),
        };

        std::task::Poll::Ready(Some(WatcherEvent::decode(buf)))
    }
}

#[derive(Debug)]
pub enum WatcherEvent {}

impl WatcherEvent {
    /// Decodes a message buffer as a [`WatcherEvent`]. Transaction
    /// ID in the message must be zero; this method does not check TXID.
    fn decode(mut buf: fidl::MessageBufEtc) -> Result<WatcherEvent, fidl::Error> {
        let (bytes, _handles) = buf.split_mut();
        let (tx_header, _body_bytes) = fidl::encoding::decode_transaction_header(bytes)?;

        match tx_header.ordinal() {
            _ => Err(fidl::Error::UnknownOrdinal {
                ordinal: tx_header.ordinal(),
                protocol_name: <WatcherMarker as fidl::endpoints::ProtocolMarker>::DEBUG_NAME,
            }),
        }
    }
}

/// A Stream of incoming requests for Watcher
pub struct WatcherRequestStream {
    inner: std::sync::Arc<fidl::ServeInner>,
    is_terminated: bool,
}

impl std::marker::Unpin for WatcherRequestStream {}

impl futures::stream::FusedStream for WatcherRequestStream {
    fn is_terminated(&self) -> bool {
        self.is_terminated
    }
}

impl fidl::endpoints::RequestStream for WatcherRequestStream {
    type Protocol = WatcherMarker;
    type ControlHandle = WatcherControlHandle;

    fn from_channel(channel: fidl::AsyncChannel) -> Self {
        Self { inner: std::sync::Arc::new(fidl::ServeInner::new(channel)), is_terminated: false }
    }

    fn control_handle(&self) -> Self::ControlHandle {
        WatcherControlHandle { inner: self.inner.clone() }
    }

    fn into_inner(self) -> (::std::sync::Arc<fidl::ServeInner>, bool) {
        (self.inner, self.is_terminated)
    }

    fn from_inner(inner: std::sync::Arc<fidl::ServeInner>, is_terminated: bool) -> Self {
        Self { inner, is_terminated }
    }
}

impl futures::Stream for WatcherRequestStream {
    type Item = Result<WatcherRequest, fidl::Error>;

    fn poll_next(
        mut self: std::pin::Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Option<Self::Item>> {
        let this = &mut *self;
        if this.inner.poll_shutdown(cx) {
            this.is_terminated = true;
            return std::task::Poll::Ready(None);
        }
        if this.is_terminated {
            panic!("polled WatcherRequestStream after completion");
        }
        fidl::encoding::with_tls_decode_buf(|bytes, handles| {
            match this.inner.channel().read_etc(cx, bytes, handles) {
                std::task::Poll::Ready(Ok(())) => {}
                std::task::Poll::Pending => return std::task::Poll::Pending,
                std::task::Poll::Ready(Err(zx_status::Status::PEER_CLOSED)) => {
                    this.is_terminated = true;
                    return std::task::Poll::Ready(None);
                }
                std::task::Poll::Ready(Err(e)) => {
                    return std::task::Poll::Ready(Some(Err(fidl::Error::ServerRequestRead(e))))
                }
            }

            // A message has been received from the channel
            let (header, _body_bytes) = fidl::encoding::decode_transaction_header(bytes)?;
            if !header.is_compatible() {
                return std::task::Poll::Ready(Some(Err(fidl::Error::IncompatibleMagicNumber(
                    header.magic_number(),
                ))));
            }

            std::task::Poll::Ready(Some(match header.ordinal() {
                0x55d559533407fed9 => {
                    let mut req: (Level,) = fidl::encoding::Decodable::new_empty();
                    fidl::duration_begin!("fidl", "decode", "bindings" => _FIDL_TRACE_BINDINGS_RUST, "name" => "fuchsia.memorypressure/WatcherOnLevelChangedRequest");
                    fidl::trace_blob!("fidl:blob", "decode", bytes);
                    if header.dynamic_flags().contains(fidl::encoding::DynamicFlags::BYTE_OVERFLOW)
                    {
                        Err(fidl::Error::LargeMessageImpossible)?;
                    }
                    fidl::encoding::Decoder::decode_into(&header, _body_bytes, handles, &mut req)?;
                    fidl::duration_end!("fidl", "decode", "bindings" => _FIDL_TRACE_BINDINGS_RUST, "size" => bytes.len() as u32, "handle_count" => handles.len() as u32);
                    let control_handle = WatcherControlHandle { inner: this.inner.clone() };

                    Ok(WatcherRequest::OnLevelChanged {
                        level: req.0,
                        responder: WatcherOnLevelChangedResponder {
                            control_handle: std::mem::ManuallyDrop::new(control_handle),
                            tx_id: header.tx_id(),
                            ordinal: header.ordinal(),
                        },
                    })
                }
                _ => Err(fidl::Error::UnknownOrdinal {
                    ordinal: header.ordinal(),
                    protocol_name: <WatcherMarker as fidl::endpoints::ProtocolMarker>::DEBUG_NAME,
                }),
            }))
        })
    }
}
/// Watcher protocol
/// To be implemented by clients who wish to be notified on memory pressure level changes.
#[derive(Debug)]
pub enum WatcherRequest {
    /// Sent to the registered client when the memory pressure level changes.
    /// `level`: indicates the current memory pressure level.
    ///
    /// Will also be invoked on initial connection via `RegisterWatcher`, so that a newly
    /// registered client can discover the current memory pressure level.
    ///
    /// The watcher must immediately reply with a message to acknowledge that it has
    /// received the level change notification, and has initiated required actions as a
    /// result. It may then continue to reclaim memory asynchronously after sending
    /// the acknowledgement.
    ///
    /// Some helpful guidelines for clients:
    /// 1. The watcher will be notified of new pressure level changes only after a reply
    /// corresponding to the previous message has been received by the provider.
    /// If multiple level transitions occur during that time, the watcher will be
    /// notified of the latest pressure level.
    ///
    /// 2. The level changes are edge-triggered, and clients are expected to maintain
    /// local state to track the current pressure level, if required. For example,
    /// a job might be notified of a CRITICAL level and drop all its caches as a result.
    /// Some time after this, it might want to trigger an activity that causes a
    /// fair amount of memory to be allocated. At this point, the job is expected to
    /// remember that the last pressure level it saw was CRITICAL, and refrain from
    /// triggering the memory-intensive activity.
    ///
    /// 3. As a performance optimization, the provider may decide to skip sending
    /// messages for some pressure level changes. For example, when oscillating across
    /// the NORMAL / WARNING boundary, it might not be worth notifying clients of every
    /// single transition. The provider might rate-limit messages in this case.
    /// On a similar note, the provider may decide to send repeated messages at the
    /// same pressure level, particularly CRITICAL, to indicate that further action
    /// needs to be taken.
    OnLevelChanged { level: Level, responder: WatcherOnLevelChangedResponder },
}

impl WatcherRequest {
    #[allow(irrefutable_let_patterns)]
    pub fn into_on_level_changed(self) -> Option<(Level, WatcherOnLevelChangedResponder)> {
        if let WatcherRequest::OnLevelChanged { level, responder } = self {
            Some((level, responder))
        } else {
            None
        }
    }

    /// Name of the method defined in FIDL
    pub fn method_name(&self) -> &'static str {
        match *self {
            WatcherRequest::OnLevelChanged { .. } => "on_level_changed",
        }
    }
}

#[derive(Debug, Clone)]
pub struct WatcherControlHandle {
    inner: std::sync::Arc<fidl::ServeInner>,
}

impl fidl::endpoints::ControlHandle for WatcherControlHandle {
    fn shutdown(&self) {
        self.inner.shutdown()
    }

    fn shutdown_with_epitaph(&self, status: zx_status::Status) {
        self.inner.shutdown_with_epitaph(status)
    }

    fn is_closed(&self) -> bool {
        self.inner.channel().is_closed()
    }

    fn on_closed<'a>(&'a self) -> fidl::OnSignals<'a> {
        self.inner.channel().on_closed()
    }
}

impl WatcherControlHandle {}
#[must_use = "FIDL methods require a response to be sent"]
#[derive(Debug)]
pub struct WatcherOnLevelChangedResponder {
    control_handle: std::mem::ManuallyDrop<WatcherControlHandle>,
    tx_id: u32,
    ordinal: u64,
}

/// Set the the channel to be shutdown (see [`WatcherControlHandle::shutdown`])
/// if the responder is dropped without sending a response, so that the client
/// doesn't hang. To prevent this behavior, call `drop_without_shutdown`.
impl std::ops::Drop for WatcherOnLevelChangedResponder {
    fn drop(&mut self) {
        self.control_handle.shutdown();
        // Safety: drops once, never accessed again
        unsafe { std::mem::ManuallyDrop::drop(&mut self.control_handle) };
    }
}

impl fidl::endpoints::Responder for WatcherOnLevelChangedResponder {
    type ControlHandle = WatcherControlHandle;

    fn control_handle(&self) -> &WatcherControlHandle {
        &self.control_handle
    }

    fn drop_without_shutdown(mut self) {
        // Safety: drops once, never accessed again due to mem::forget
        unsafe { std::mem::ManuallyDrop::drop(&mut self.control_handle) };
        // Prevent Drop from running (which would shut down the channel)
        std::mem::forget(self);
    }
}

impl WatcherOnLevelChangedResponder {
    /// Sends a response to the FIDL transaction.
    ///
    /// Sets the channel to shutdown if an error occurs.
    pub fn send(self) -> Result<(), fidl::Error> {
        let r = self.send_raw();
        if r.is_err() {
            self.control_handle.shutdown();
        }
        self.drop_without_shutdown();
        r
    }

    /// Similar to "send" but does not shutdown the channel if
    /// an error occurs.
    pub fn send_no_shutdown_on_err(self) -> Result<(), fidl::Error> {
        let r = self.send_raw();
        self.drop_without_shutdown();
        r
    }

    fn send_raw(&self) -> Result<(), fidl::Error> {
        let mut response = (());

        let mut msg = fidl::encoding::TransactionMessage {
            header: fidl::encoding::TransactionHeader::new(
                self.tx_id,
                self.ordinal,
                fidl::encoding::DynamicFlags::empty(),
            ),
            body: &mut response,
        };

        fidl::encoding::with_tls_encode_buf(|bytes, handles| {
            fidl::duration_begin!("fidl", "encode", "bindings" => _FIDL_TRACE_BINDINGS_RUST, "name" => "fuchsia.memorypressure/WatcherOnLevelChangedResponse");
            fidl::encoding::Encoder::encode(bytes, handles, &mut msg)?;
            fidl::trace_blob!("fidl:blob", "encode", bytes.as_slice());
            fidl::duration_end!("fidl", "encode", "bindings" => _FIDL_TRACE_BINDINGS_RUST, "size" => bytes.len() as u32, "handle_count" => handles.len() as u32);

            self.control_handle.inner.send_raw_msg(&*bytes, &mut *handles)
        })
    }
}