/*
* Copyright (C) 2016 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.pm;
import static com.android.server.pm.PackageManagerService.DEBUG_DEXOPT;
import static com.android.server.pm.PackageManagerService.TAG;
import android.annotation.NonNull;
import android.app.AppGlobals;
import android.content.Intent;
import android.content.pm.PackageParser;
import android.content.pm.ResolveInfo;
import android.os.RemoteException;
import android.os.UserHandle;
import android.system.ErrnoException;
import android.util.ArraySet;
import android.util.Log;
import libcore.io.Libcore;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.function.Predicate;
/**
* Class containing helper methods for the PackageManagerService.
*
* {@hide}
*/
public class PackageManagerServiceUtils {
private final static long SEVEN_DAYS_IN_MILLISECONDS = 7 * 24 * 60 * 60 * 1000;
private static ArraySet<String> getPackageNamesForIntent(Intent intent, int userId) {
List<ResolveInfo> ris = null;
try {
ris = AppGlobals.getPackageManager().queryIntentReceivers(intent, null, 0, userId)
.getList();
} catch (RemoteException e) {
}
ArraySet<String> pkgNames = new ArraySet<String>();
if (ris != null) {
for (ResolveInfo ri : ris) {
pkgNames.add(ri.activityInfo.packageName);
}
}
return pkgNames;
}
// Sort a list of apps by their last usage, most recently used apps first. The order of
// packages without usage data is undefined (but they will be sorted after the packages
// that do have usage data).
public static void sortPackagesByUsageDate(List<PackageParser.Package> pkgs,
PackageManagerService packageManagerService) {
if (!packageManagerService.isHistoricalPackageUsageAvailable()) {
return;
}
Collections.sort(pkgs, (pkg1, pkg2) ->
Long.compare(pkg2.getLatestForegroundPackageUseTimeInMills(),
pkg1.getLatestForegroundPackageUseTimeInMills()));
}
// Apply the given {@code filter} to all packages in {@code packages}. If tested positive, the
// package will be removed from {@code packages} and added to {@code result} with its
// dependencies. If usage data is available, the positive packages will be sorted by usage
// data (with {@code sortTemp} as temporary storage).
private static void applyPackageFilter(Predicate<PackageParser.Package> filter,
Collection<PackageParser.Package> result,
Collection<PackageParser.Package> packages,
@NonNull List<PackageParser.Package> sortTemp,
PackageManagerService packageManagerService) {
for (PackageParser.Package pkg : packages) {
if (filter.test(pkg)) {
sortTemp.add(pkg);
}
}
sortPackagesByUsageDate(sortTemp, packageManagerService);
packages.removeAll(sortTemp);
for (PackageParser.Package pkg : sortTemp) {
result.add(pkg);
Collection<PackageParser.Package> deps =
packageManagerService.findSharedNonSystemLibraries(pkg);
if (!deps.isEmpty()) {
deps.removeAll(result);
result.addAll(deps);
packages.removeAll(deps);
}
}
sortTemp.clear();
}
// Sort apps by importance for dexopt ordering. Important apps are given
// more priority in case the device runs out of space.
public static List<PackageParser.Package> getPackagesForDexopt(
Collection<PackageParser.Package> packages,
PackageManagerService packageManagerService) {
ArrayList<PackageParser.Package> remainingPkgs = new ArrayList<>(packages);
LinkedList<PackageParser.Package> result = new LinkedList<>();
ArrayList<PackageParser.Package> sortTemp = new ArrayList<>(remainingPkgs.size());
// Give priority to core apps.
applyPackageFilter((pkg) -> pkg.coreApp, result, remainingPkgs, sortTemp,
packageManagerService);
// Give priority to system apps that listen for pre boot complete.
Intent intent = new Intent(Intent.ACTION_PRE_BOOT_COMPLETED);
final ArraySet<String> pkgNames = getPackageNamesForIntent(intent, UserHandle.USER_SYSTEM);
applyPackageFilter((pkg) -> pkgNames.contains(pkg.packageName), result, remainingPkgs,
sortTemp, packageManagerService);
// Give priority to apps used by other apps.
applyPackageFilter((pkg) -> PackageDexOptimizer.isUsedByOtherApps(pkg), result,
remainingPkgs, sortTemp, packageManagerService);
// Filter out packages that aren't recently used, add all remaining apps.
// TODO: add a property to control this?
Predicate<PackageParser.Package> remainingPredicate;
if (!remainingPkgs.isEmpty() && packageManagerService.isHistoricalPackageUsageAvailable()) {
if (DEBUG_DEXOPT) {
Log.i(TAG, "Looking at historical package use");
}
// Get the package that was used last.
PackageParser.Package lastUsed = Collections.max(remainingPkgs, (pkg1, pkg2) ->
Long.compare(pkg1.getLatestForegroundPackageUseTimeInMills(),
pkg2.getLatestForegroundPackageUseTimeInMills()));
if (DEBUG_DEXOPT) {
Log.i(TAG, "Taking package " + lastUsed.packageName + " as reference in time use");
}
long estimatedPreviousSystemUseTime =
lastUsed.getLatestForegroundPackageUseTimeInMills();
// Be defensive if for some reason package usage has bogus data.
if (estimatedPreviousSystemUseTime != 0) {
final long cutoffTime = estimatedPreviousSystemUseTime - SEVEN_DAYS_IN_MILLISECONDS;
remainingPredicate =
(pkg) -> pkg.getLatestForegroundPackageUseTimeInMills() >= cutoffTime;
} else {
// No meaningful historical info. Take all.
remainingPredicate = (pkg) -> true;
}
sortPackagesByUsageDate(remainingPkgs, packageManagerService);
} else {
// No historical info. Take all.
remainingPredicate = (pkg) -> true;
}
applyPackageFilter(remainingPredicate, result, remainingPkgs, sortTemp,
packageManagerService);
if (DEBUG_DEXOPT) {
Log.i(TAG, "Packages to be dexopted: " + packagesToString(result));
Log.i(TAG, "Packages skipped from dexopt: " + packagesToString(remainingPkgs));
}
return result;
}
/**
* Returns the canonicalized path of {@code path} as per {@code realpath(3)}
* semantics.
*/
public static String realpath(File path) throws IOException {
try {
return Libcore.os.realpath(path.getAbsolutePath());
} catch (ErrnoException ee) {
throw ee.rethrowAsIOException();
}
}
public static String packagesToString(Collection<PackageParser.Package> c) {
StringBuilder sb = new StringBuilder();
for (PackageParser.Package pkg : c) {
if (sb.length() > 0) {
sb.append(", ");
}
sb.append(pkg.packageName);
}
return sb.toString();
}
}