| /* |
| * 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 static com.android.server.wm.ActivityStack.ActivityState.PAUSING; |
| import static com.android.server.wm.ActivityStack.ActivityState.RESUMED; |
| import static com.android.server.wm.ActivityTaskManagerDebugConfig.DEBUG_CLEANUP; |
| import static com.android.server.wm.ActivityTaskManagerDebugConfig.TAG_ATM; |
| |
| import android.util.ArraySet; |
| import android.util.Slog; |
| |
| import java.io.PrintWriter; |
| import java.util.function.Consumer; |
| |
| /** |
| * Class for tracking the connections to services on the AM side that activities on the |
| * WM side (in the future) bind with for things like oom score adjustment. Would normally be one |
| * instance of this per activity for tracking all services connected to that activity. AM will |
| * sometimes query this to bump the OOM score for the processes with services connected to visible |
| * activities. |
| * <p> |
| * Public methods are called in AM lock, otherwise in WM lock. |
| */ |
| public class ActivityServiceConnectionsHolder<T> { |
| |
| private final ActivityTaskManagerService mService; |
| |
| /** The activity the owns this service connection object. */ |
| private final ActivityRecord mActivity; |
| |
| /** |
| * The service connection object bounded with the owning activity. They represent |
| * ConnectionRecord on the AM side, however we don't need to know their object representation |
| * on the WM side since we don't perform operations on the object. Mainly here for communication |
| * and booking with the AM side. |
| */ |
| private ArraySet<T> mConnections; |
| |
| /** Whether all connections of {@link #mActivity} are being removed. */ |
| private volatile boolean mIsDisconnecting; |
| |
| ActivityServiceConnectionsHolder(ActivityTaskManagerService service, ActivityRecord activity) { |
| mService = service; |
| mActivity = activity; |
| } |
| |
| /** Adds a connection record that the activity has bound to a specific service. */ |
| public void addConnection(T c) { |
| synchronized (mService.mGlobalLock) { |
| if (mIsDisconnecting) { |
| // This is unlikely to happen because the caller should create a new holder. |
| if (DEBUG_CLEANUP) { |
| Slog.e(TAG_ATM, "Skip adding connection " + c + " to a disconnecting holder of " |
| + mActivity); |
| } |
| return; |
| } |
| if (mConnections == null) { |
| mConnections = new ArraySet<>(); |
| } |
| mConnections.add(c); |
| } |
| } |
| |
| /** Removed a connection record between the activity and a specific service. */ |
| public void removeConnection(T c) { |
| synchronized (mService.mGlobalLock) { |
| if (mConnections == null) { |
| return; |
| } |
| if (DEBUG_CLEANUP && mIsDisconnecting) { |
| Slog.v(TAG_ATM, "Remove pending disconnecting " + c + " of " + mActivity); |
| } |
| mConnections.remove(c); |
| } |
| } |
| |
| public boolean isActivityVisible() { |
| synchronized (mService.mGlobalLock) { |
| return mActivity.mVisibleRequested || mActivity.isState(RESUMED, PAUSING); |
| } |
| } |
| |
| public int getActivityPid() { |
| synchronized (mService.mGlobalLock) { |
| return mActivity.hasProcess() ? mActivity.app.getPid() : -1; |
| } |
| } |
| |
| public void forEachConnection(Consumer<T> consumer) { |
| synchronized (mService.mGlobalLock) { |
| if (mConnections == null || mConnections.isEmpty()) { |
| return; |
| } |
| for (int i = mConnections.size() - 1; i >= 0; i--) { |
| consumer.accept(mConnections.valueAt(i)); |
| } |
| } |
| } |
| |
| /** |
| * Removes the connection between the activity and all services that were connected to it. In |
| * general, this method is used to clean up if the activity didn't unbind services before it |
| * is destroyed. |
| */ |
| void disconnectActivityFromServices() { |
| if (mConnections == null || mConnections.isEmpty() || mIsDisconnecting) { |
| return; |
| } |
| // Mark as disconnecting, to guarantee that we process |
| // disconnect of these specific connections exactly once even if |
| // we're racing with rapid activity lifecycle churn and this |
| // method is invoked more than once on this object. |
| // It is possible that {@link #removeConnection} is called while the disconnect-runnable is |
| // still in the message queue, so keep the reference of {@link #mConnections} to make sure |
| // the connection list is up-to-date. |
| mIsDisconnecting = true; |
| mService.mH.post(() -> { |
| mService.mAmInternal.disconnectActivityFromServices(this); |
| mIsDisconnecting = false; |
| }); |
| } |
| |
| public void dump(PrintWriter pw, String prefix) { |
| synchronized (mService.mGlobalLock) { |
| pw.println(prefix + "activity=" + mActivity); |
| } |
| } |
| |
| /** Used by {@link ActivityRecord#dump}. */ |
| @Override |
| public String toString() { |
| return String.valueOf(mConnections); |
| } |
| } |