1 /*
<lambda>null2 * Copyright (C) 2024 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package com.android.systemui.kairos.internal
18
19 import com.android.systemui.kairos.util.Maybe
20
21 /* Initialized TFlow */
22 internal fun interface TFlowImpl<out A> {
23 suspend fun activate(evalScope: EvalScope, downstream: Schedulable): ActivationResult<A>?
24 }
25
26 internal data class ActivationResult<out A>(
27 val connection: NodeConnection<A>,
28 val needsEval: Boolean,
29 )
30
TFlowCheapnull31 internal inline fun <A> TFlowCheap(crossinline cheap: CheapNodeSubscribe<A>) =
32 TFlowImpl { scope, ds ->
33 scope.cheap(ds)
34 }
35
36 internal typealias CheapNodeSubscribe<A> =
37 suspend EvalScope.(downstream: Schedulable) -> ActivationResult<A>?
38
39 internal data class NodeConnection<out A>(
40 val directUpstream: PullNode<A>,
41 val schedulerUpstream: PushNode<*>,
42 )
43
hasCurrentValuenull44 internal suspend fun <A> NodeConnection<A>.hasCurrentValue(
45 transactionStore: TransactionStore
46 ): Boolean = schedulerUpstream.hasCurrentValue(transactionStore)
47
48 internal suspend fun <A> NodeConnection<A>.removeDownstreamAndDeactivateIfNeeded(
49 downstream: Schedulable
50 ) = schedulerUpstream.removeDownstreamAndDeactivateIfNeeded(downstream)
51
52 internal suspend fun <A> NodeConnection<A>.scheduleDeactivationIfNeeded(evalScope: EvalScope) =
53 schedulerUpstream.scheduleDeactivationIfNeeded(evalScope)
54
55 internal suspend fun <A> NodeConnection<A>.removeDownstream(downstream: Schedulable) =
56 schedulerUpstream.removeDownstream(downstream)
57
58 internal suspend fun <A> NodeConnection<A>.getPushEvent(evalScope: EvalScope): Maybe<A> =
59 directUpstream.getPushEvent(evalScope)
60
61 internal val <A> NodeConnection<A>.depthTracker: DepthTracker
62 get() = schedulerUpstream.depthTracker
63