| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.wm; |
| |
| import android.annotation.NonNull; |
| |
| /** |
| * Multi-cast delegate implementation for {@link ActivityMetricsLaunchObserver}. |
| * |
| * <br/><br/> |
| * This enables multiple launch observers to subscribe to {@link ActivityMetricsLogger} |
| * independently of each other. |
| * |
| * <br/><br/> |
| * Some callbacks in {@link ActivityMetricsLaunchObserver} have a {@code byte[]} |
| * parameter; this array is reused by all the registered observers, so it must not be written to |
| * (i.e. all observers must treat any array parameters as immutable). |
| * |
| * <br /><br /> |
| * Multi-cast invocations occurs sequentially in-order of registered observers. |
| */ |
| public interface ActivityMetricsLaunchObserverRegistry { |
| /** |
| * Register an extra launch observer to receive the multi-cast. |
| * |
| * <br /><br /> |
| * Multi-cast invocation happens in the same order the observers were registered. For example, |
| * <pre> |
| * registerLaunchObserver(A) |
| * registerLaunchObserver(B) |
| * |
| * obs.onIntentFailed() -> |
| * A.onIntentFailed() |
| * B.onIntentFailed() |
| * </pre> |
| */ |
| void registerLaunchObserver(@NonNull ActivityMetricsLaunchObserver launchObserver); |
| |
| /** |
| * Unregister an existing launch observer. It will not receive the multi-cast in the future. |
| * |
| * <br /><br /> |
| * This does nothing if this observer was not already registered. |
| */ |
| void unregisterLaunchObserver(@NonNull ActivityMetricsLaunchObserver launchObserver); |
| } |