Igor Murashkin | c0b47e4 | 2018-11-07 15:54:18 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 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.server.wm; |
| 18 | |
| 19 | import android.annotation.NonNull; |
| 20 | |
| 21 | /** |
| 22 | * Multi-cast delegate implementation for {@link ActivityMetricsLaunchObserver}. |
| 23 | * |
| 24 | * <br/><br/> |
| 25 | * This enables multiple launch observers to subscribe to {@link ActivityMetricsLogger} |
| 26 | * independently of each other. |
| 27 | * |
| 28 | * <br/><br/> |
| 29 | * Some callbacks in {@link ActivityMetricsLaunchObserver} have a {@code byte[]} |
| 30 | * parameter; this array is reused by all the registered observers, so it must not be written to |
| 31 | * (i.e. all observers must treat any array parameters as immutable). |
| 32 | * |
| 33 | * <br /><br /> |
| 34 | * Multi-cast invocations occurs sequentially in-order of registered observers. |
| 35 | */ |
| 36 | public interface ActivityMetricsLaunchObserverRegistry { |
| 37 | /** |
| 38 | * Register an extra launch observer to receive the multi-cast. |
| 39 | * |
| 40 | * <br /><br /> |
| 41 | * Multi-cast invocation happens in the same order the observers were registered. For example, |
| 42 | * <pre> |
| 43 | * registerLaunchObserver(A) |
| 44 | * registerLaunchObserver(B) |
| 45 | * |
| 46 | * obs.onIntentFailed() -> |
| 47 | * A.onIntentFailed() |
| 48 | * B.onIntentFailed() |
| 49 | * </pre> |
| 50 | */ |
| 51 | void registerLaunchObserver(@NonNull ActivityMetricsLaunchObserver launchObserver); |
| 52 | |
| 53 | /** |
| 54 | * Unregister an existing launch observer. It will not receive the multi-cast in the future. |
| 55 | * |
| 56 | * <br /><br /> |
| 57 | * This does nothing if this observer was not already registered. |
| 58 | */ |
| 59 | void unregisterLaunchObserver(@NonNull ActivityMetricsLaunchObserver launchObserver); |
| 60 | } |