| /* |
| * Copyright (C) 2017 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.systemui.util.leak; |
| |
| import android.os.Build; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.util.IndentingPrintWriter; |
| import com.android.systemui.Dumpable; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.io.Writer; |
| import java.util.Collection; |
| |
| /** |
| * Detects leaks. |
| */ |
| public class LeakDetector implements Dumpable { |
| |
| private static final boolean ENABLED = Build.IS_DEBUGGABLE; |
| |
| private final TrackedCollections mTrackedCollections; |
| private final TrackedGarbage mTrackedGarbage; |
| private final TrackedObjects mTrackedObjects; |
| |
| @VisibleForTesting |
| public LeakDetector(TrackedCollections trackedCollections, |
| TrackedGarbage trackedGarbage, |
| TrackedObjects trackedObjects) { |
| mTrackedCollections = trackedCollections; |
| mTrackedGarbage = trackedGarbage; |
| mTrackedObjects = trackedObjects; |
| } |
| |
| /** |
| * Tracks an instance that has a high leak risk (i.e. has complex ownership and references |
| * a large amount of memory). |
| * |
| * The LeakDetector will monitor and keep weak references to such instances, dump statistics |
| * about them in a bugreport, and in the future dump the heap if their count starts growing |
| * unreasonably. |
| * |
| * This should be called when the instance is first constructed. |
| */ |
| public <T> void trackInstance(T object) { |
| if (mTrackedObjects != null) { |
| mTrackedObjects.track(object); |
| } |
| } |
| |
| /** |
| * Tracks a collection that is at risk of leaking large objects, e.g. a collection of |
| * dynamically registered listeners. |
| * |
| * The LeakDetector will monitor and keep weak references to such collections, dump |
| * statistics about them in a bugreport, and in the future dump the heap if their size starts |
| * growing unreasonably. |
| * |
| * This should be called whenever the collection grows. |
| * |
| * @param tag A tag for labeling the collection in a bugreport |
| */ |
| public <T> void trackCollection(Collection<T> collection, String tag) { |
| if (mTrackedCollections != null) { |
| mTrackedCollections.track(collection, tag); |
| } |
| } |
| |
| /** |
| * Tracks an instance that should become garbage soon. |
| * |
| * The LeakDetector will monitor and keep weak references to such garbage, dump |
| * statistics about them in a bugreport, and in the future dump the heap if it is not |
| * collected reasonably soon. |
| * |
| * This should be called when the last strong reference to the instance is dropped. |
| */ |
| public void trackGarbage(Object o) { |
| if (mTrackedGarbage != null) { |
| mTrackedGarbage.track(o); |
| } |
| } |
| |
| @Override |
| public void dump(FileDescriptor df, PrintWriter w, String[] args) { |
| IndentingPrintWriter pw = new IndentingPrintWriter(w, " "); |
| |
| pw.println("SYSUI LEAK DETECTOR"); |
| pw.increaseIndent(); |
| |
| if (mTrackedCollections != null && mTrackedGarbage != null) { |
| pw.println("TrackedCollections:"); |
| pw.increaseIndent(); |
| mTrackedCollections.dump(pw, (col) -> !TrackedObjects.isTrackedObject(col)); |
| pw.decreaseIndent(); |
| pw.println(); |
| |
| pw.println("TrackedObjects:"); |
| pw.increaseIndent(); |
| mTrackedCollections.dump(pw, TrackedObjects::isTrackedObject); |
| pw.decreaseIndent(); |
| pw.println(); |
| |
| pw.print("TrackedGarbage:"); |
| pw.increaseIndent(); |
| mTrackedGarbage.dump(pw); |
| pw.decreaseIndent(); |
| } else { |
| pw.println("disabled"); |
| } |
| pw.decreaseIndent(); |
| pw.println(); |
| } |
| |
| public static LeakDetector create() { |
| if (ENABLED) { |
| TrackedCollections collections = new TrackedCollections(); |
| return new LeakDetector(collections, new TrackedGarbage(collections), |
| new TrackedObjects(collections)); |
| } else { |
| return new LeakDetector(null, null, null); |
| } |
| } |
| } |