1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
// 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)
        })
    }
}