TouchDex.java revision 2ad60cfc28e14ee8f0bb038720836a4696c478ad 
1/*
2 * Copyright (C) 2007 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 dalvik.system;
18
19import java.io.BufferedReader;
20import java.io.InputStreamReader;
21import java.io.IOException;
22import java.io.File;
23import java.io.FilenameFilter;
24
25/**
26 * Induce optimization/verification of a set of DEX files.
27 *
28 * TODO: This class is public, so SystemServer can access it.  This is NOT
29 * the correct long-term solution; once we have a real installer and/or
30 * dalvik-cache manager, this class should be removed.
31 */
32public class TouchDex {
33
34    /**
35     * Fork a process, make sure the DEX files are prepped, and return
36     * when everything is finished.
37     *
38     * The filenames must be the same as will be used when the files are
39     * actually opened, because the dalvik-cache filename is based upon
40     * this filename.  (The absolute path to the jar/apk should work.)
41     *
42     * @param dexFiles Colon-separated list of DEX files.
43     * @return zero on success
44     */
45    public static int start(String dexFiles) {
46        return trampoline(dexFiles, System.getProperty("java.boot.class.path"));
47    }
48
49    /**
50     * This calls fork() and then, in the child, calls cont(dexFiles).
51     *
52     * @param dexFiles Colon-separated list of DEX files.
53     * @return zero on success
54     */
55    native private static int trampoline(String dexFiles, String bcp);
56
57    /**
58     * We continue here in the child process. args[0] can be a colon-separated
59     * path list, or "-" to read from stdin.
60     *
61     * Alternatively, if we're invoked directly from the command line we
62     * just start here (skipping the fork/exec stuff).
63     *
64     * @param args command line args
65     */
66    public static void main(String[] args) {
67
68        if ("-".equals(args[0])) {
69            BufferedReader in = new BufferedReader(
70                    new InputStreamReader(System.in), 256);
71
72            String line;
73            try {
74                while ((line = in.readLine()) != null) {
75                    prepFiles(line);
76                }
77            } catch (IOException ex) {
78                throw new RuntimeException ("Error processing stdin");
79            }
80        } else {
81            prepFiles(args[0]);
82        }
83
84        System.out.println(" Prep complete");
85    }
86
87
88    private static String expandDirectories(String dexPath) {
89        String[] parts = dexPath.split(":");
90        StringBuilder outPath = new StringBuilder(dexPath.length());
91
92        // A filename filter accepting *.jar and *.apk
93        FilenameFilter filter = new FilenameFilter() {
94            public boolean accept(File dir, String name) {
95                return name.endsWith(".jar") || name.endsWith(".apk");
96            }
97        };
98
99        for (String part: parts) {
100            File f = new File(part);
101
102            if (f.isFile()) {
103                outPath.append(part);
104                outPath.append(':');
105            } else if (f.isDirectory()) {
106                String[] filenames = f.list(filter);
107
108                if (filenames == null) {
109                    System.err.println("I/O error with directory: " + part);
110                    continue;
111                }
112
113                for (String filename: filenames) {
114                    outPath.append(part);
115                    outPath.append(File.separatorChar);
116                    outPath.append(filename);
117                    outPath.append(':');
118                }
119            } else {
120                System.err.println("File not found: " + part);
121            }
122        }
123
124
125        return outPath.toString();
126    }
127
128    private static void prepFiles(String dexPath) {
129
130        System.out.println(" Prepping: " + dexPath);
131
132        TouchDexLoader loader
133                = new TouchDexLoader(expandDirectories(dexPath), null);
134
135        try {
136            /* By looking for a nonexistent class, we'll trick TouchDexLoader
137             * into trying to load something from every file on dexPath,
138             * optimizing all of them as a side-effect.
139             *
140             * The optimization happens implicitly in the VM the first time
141             * someone tries to load a class from an unoptimized dex file.
142             */
143            loader.loadClass("com.google.NonexistentClassNeverFound");
144            throw new RuntimeException("nonexistent class loaded?!");
145        } catch (ClassNotFoundException cnfe) {
146            //System.out.println("got expected dnfe");
147        }
148    }
149}
150
151