PackageManagerServiceUtils.java revision 2e565e6d6ec1a8be52f9d2b5a67597cf4791434d 
1/*
2 * Copyright (C) 2016 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
17package com.android.server.pm;
18
19import com.android.server.pm.dex.DexManager;
20import com.android.server.pm.dex.PackageDexUsage;
21
22import static com.android.server.pm.PackageManagerService.DEBUG_DEXOPT;
23import static com.android.server.pm.PackageManagerService.TAG;
24
25import android.annotation.NonNull;
26import android.app.AppGlobals;
27import android.content.Intent;
28import android.content.pm.PackageInfo;
29import android.content.pm.PackageParser;
30import android.content.pm.ResolveInfo;
31import android.os.Build;
32import android.os.RemoteException;
33import android.os.UserHandle;
34import android.system.ErrnoException;
35import android.util.ArraySet;
36import android.util.Log;
37import dalvik.system.VMRuntime;
38import libcore.io.Libcore;
39
40import java.io.File;
41import java.io.IOException;
42import java.util.ArrayList;
43import java.util.Collection;
44import java.util.Collections;
45import java.util.LinkedList;
46import java.util.List;
47import java.util.function.Predicate;
48
49/**
50 * Class containing helper methods for the PackageManagerService.
51 *
52 * {@hide}
53 */
54public class PackageManagerServiceUtils {
55    private final static long SEVEN_DAYS_IN_MILLISECONDS = 7 * 24 * 60 * 60 * 1000;
56
57    private static ArraySet<String> getPackageNamesForIntent(Intent intent, int userId) {
58        List<ResolveInfo> ris = null;
59        try {
60            ris = AppGlobals.getPackageManager().queryIntentReceivers(intent, null, 0, userId)
61                    .getList();
62        } catch (RemoteException e) {
63        }
64        ArraySet<String> pkgNames = new ArraySet<String>();
65        if (ris != null) {
66            for (ResolveInfo ri : ris) {
67                pkgNames.add(ri.activityInfo.packageName);
68            }
69        }
70        return pkgNames;
71    }
72
73    // Sort a list of apps by their last usage, most recently used apps first. The order of
74    // packages without usage data is undefined (but they will be sorted after the packages
75    // that do have usage data).
76    public static void sortPackagesByUsageDate(List<PackageParser.Package> pkgs,
77            PackageManagerService packageManagerService) {
78        if (!packageManagerService.isHistoricalPackageUsageAvailable()) {
79            return;
80        }
81
82        Collections.sort(pkgs, (pkg1, pkg2) ->
83                Long.compare(pkg2.getLatestForegroundPackageUseTimeInMills(),
84                        pkg1.getLatestForegroundPackageUseTimeInMills()));
85    }
86
87    // Apply the given {@code filter} to all packages in {@code packages}. If tested positive, the
88    // package will be removed from {@code packages} and added to {@code result} with its
89    // dependencies. If usage data is available, the positive packages will be sorted by usage
90    // data (with {@code sortTemp} as temporary storage).
91    private static void applyPackageFilter(Predicate<PackageParser.Package> filter,
92            Collection<PackageParser.Package> result,
93            Collection<PackageParser.Package> packages,
94            @NonNull List<PackageParser.Package> sortTemp,
95            PackageManagerService packageManagerService) {
96        for (PackageParser.Package pkg : packages) {
97            if (filter.test(pkg)) {
98                sortTemp.add(pkg);
99            }
100        }
101
102        sortPackagesByUsageDate(sortTemp, packageManagerService);
103        packages.removeAll(sortTemp);
104
105        for (PackageParser.Package pkg : sortTemp) {
106            result.add(pkg);
107
108            Collection<PackageParser.Package> deps =
109                    packageManagerService.findSharedNonSystemLibraries(pkg);
110            if (!deps.isEmpty()) {
111                deps.removeAll(result);
112                result.addAll(deps);
113                packages.removeAll(deps);
114            }
115        }
116
117        sortTemp.clear();
118    }
119
120    // Sort apps by importance for dexopt ordering. Important apps are given
121    // more priority in case the device runs out of space.
122    public static List<PackageParser.Package> getPackagesForDexopt(
123            Collection<PackageParser.Package> packages,
124            PackageManagerService packageManagerService) {
125        ArrayList<PackageParser.Package> remainingPkgs = new ArrayList<>(packages);
126        LinkedList<PackageParser.Package> result = new LinkedList<>();
127        ArrayList<PackageParser.Package> sortTemp = new ArrayList<>(remainingPkgs.size());
128
129        // Give priority to core apps.
130        applyPackageFilter((pkg) -> pkg.coreApp, result, remainingPkgs, sortTemp,
131                packageManagerService);
132
133        // Give priority to system apps that listen for pre boot complete.
134        Intent intent = new Intent(Intent.ACTION_PRE_BOOT_COMPLETED);
135        final ArraySet<String> pkgNames = getPackageNamesForIntent(intent, UserHandle.USER_SYSTEM);
136        applyPackageFilter((pkg) -> pkgNames.contains(pkg.packageName), result, remainingPkgs,
137                sortTemp, packageManagerService);
138
139        // Give priority to apps used by other apps.
140        applyPackageFilter((pkg) ->
141                packageManagerService.getDexManager().isUsedByOtherApps(pkg.packageName), result,
142                remainingPkgs, sortTemp, packageManagerService);
143
144        // Filter out packages that aren't recently used, add all remaining apps.
145        // TODO: add a property to control this?
146        Predicate<PackageParser.Package> remainingPredicate;
147        if (!remainingPkgs.isEmpty() && packageManagerService.isHistoricalPackageUsageAvailable()) {
148            if (DEBUG_DEXOPT) {
149                Log.i(TAG, "Looking at historical package use");
150            }
151            // Get the package that was used last.
152            PackageParser.Package lastUsed = Collections.max(remainingPkgs, (pkg1, pkg2) ->
153                    Long.compare(pkg1.getLatestForegroundPackageUseTimeInMills(),
154                            pkg2.getLatestForegroundPackageUseTimeInMills()));
155            if (DEBUG_DEXOPT) {
156                Log.i(TAG, "Taking package " + lastUsed.packageName + " as reference in time use");
157            }
158            long estimatedPreviousSystemUseTime =
159                    lastUsed.getLatestForegroundPackageUseTimeInMills();
160            // Be defensive if for some reason package usage has bogus data.
161            if (estimatedPreviousSystemUseTime != 0) {
162                final long cutoffTime = estimatedPreviousSystemUseTime - SEVEN_DAYS_IN_MILLISECONDS;
163                remainingPredicate =
164                        (pkg) -> pkg.getLatestForegroundPackageUseTimeInMills() >= cutoffTime;
165            } else {
166                // No meaningful historical info. Take all.
167                remainingPredicate = (pkg) -> true;
168            }
169            sortPackagesByUsageDate(remainingPkgs, packageManagerService);
170        } else {
171            // No historical info. Take all.
172            remainingPredicate = (pkg) -> true;
173        }
174        applyPackageFilter(remainingPredicate, result, remainingPkgs, sortTemp,
175                packageManagerService);
176
177        if (DEBUG_DEXOPT) {
178            Log.i(TAG, "Packages to be dexopted: " + packagesToString(result));
179            Log.i(TAG, "Packages skipped from dexopt: " + packagesToString(remainingPkgs));
180        }
181
182        return result;
183    }
184
185    /**
186     * Checks if the package was inactive during since <code>thresholdTimeinMillis</code>.
187     * Package is considered active, if:
188     * 1) It was active in foreground.
189     * 2) It was active in background and also used by other apps.
190     *
191     * If it doesn't have sufficient information about the package, it return <code>false</code>.
192     */
193    static boolean isUnusedSinceTimeInMillis(long firstInstallTime, long currentTimeInMillis,
194            long thresholdTimeinMillis, PackageDexUsage.PackageUseInfo packageUseInfo,
195            long latestPackageUseTimeInMillis, long latestForegroundPackageUseTimeInMillis) {
196
197        if (currentTimeInMillis - firstInstallTime < thresholdTimeinMillis) {
198            return false;
199        }
200
201        // If the app was active in foreground during the threshold period.
202        boolean isActiveInForeground = (currentTimeInMillis
203                - latestForegroundPackageUseTimeInMillis)
204                < thresholdTimeinMillis;
205
206        if (isActiveInForeground) {
207            return false;
208        }
209
210        // If the app was active in background during the threshold period and was used
211        // by other packages.
212        // If packageUseInfo is null, it can be said that the package was not used by other
213        // packages.
214        boolean isActiveInBackgroundAndUsedByOtherPackages = ((currentTimeInMillis
215                - latestPackageUseTimeInMillis)
216                < thresholdTimeinMillis)
217                && (packageUseInfo != null && packageUseInfo.isUsedByOtherApps());
218
219        return !isActiveInBackgroundAndUsedByOtherPackages;
220    }
221
222    /**
223     * Returns the canonicalized path of {@code path} as per {@code realpath(3)}
224     * semantics.
225     */
226    public static String realpath(File path) throws IOException {
227        try {
228            return Libcore.os.realpath(path.getAbsolutePath());
229        } catch (ErrnoException ee) {
230            throw ee.rethrowAsIOException();
231        }
232    }
233
234    public static String packagesToString(Collection<PackageParser.Package> c) {
235        StringBuilder sb = new StringBuilder();
236        for (PackageParser.Package pkg : c) {
237            if (sb.length() > 0) {
238                sb.append(", ");
239            }
240            sb.append(pkg.packageName);
241        }
242        return sb.toString();
243    }
244
245    /**
246     * Verifies that the given string {@code isa} is a valid supported isa on
247     * the running device.
248     */
249    public static boolean checkISA(String isa) {
250        for (String abi : Build.SUPPORTED_ABIS) {
251            if (VMRuntime.getInstructionSet(abi).equals(isa)) {
252                return true;
253            }
254        }
255        return false;
256    }
257}
258