From 58f5bb5e72221b538fbcc55eb6c2a2499f8c2488 Mon Sep 17 00:00:00 2001
From: Yohann Roussel <yroussel@google.com>
Date: Mon, 21 Jul 2014 17:47:26 +0200
Subject: Use a simulated code-cache for storing extracted files.

This should allow an automatic cleaning when updating to L without having to
check at each launch.

Bug: 10447095

(cherry picked from commit 590a07e63868f0a1da311ff22b4a9f35eb48a865)

Change-Id: I90b80c0c196b5da2b63bced30b2ba5e93ecb594a
---
 library/src/android/support/multidex/MultiDex.java | 35 ++++++++--------------
 .../support/multidex/MultiDexExtractor.java        |  7 ++---
 2 files changed, 16 insertions(+), 26 deletions(-)

diff --git a/library/src/android/support/multidex/MultiDex.java b/library/src/android/support/multidex/MultiDex.java
index 68462c2..8d5e1ab 100644
--- a/library/src/android/support/multidex/MultiDex.java
+++ b/library/src/android/support/multidex/MultiDex.java
@@ -58,7 +58,10 @@ public final class MultiDex {
 
     static final String TAG = "MultiDex";
 
-    private static final String SECONDARY_FOLDER_NAME = "secondary-dexes";
+    private static final String OLD_SECONDARY_FOLDER_NAME = "secondary-dexes";
+
+    private static final String SECONDARY_FOLDER_NAME = "code_cache" + File.separator +
+        "secondary-dexes";
 
     private static final int MAX_SUPPORTED_SDK_VERSION = 20;
 
@@ -89,12 +92,6 @@ public final class MultiDex {
         Log.i(TAG, "install");
         if (IS_VM_MULTIDEX_CAPABLE) {
             Log.i(TAG, "VM has multidex support, MultiDex support library is disabled.");
-            try {
-                clearOldDexDir(context);
-            } catch (Throwable t) {
-                Log.w(TAG, "Something went wrong when trying to clear old MultiDex extraction, "
-                        + "continuing without cleaning.", t);
-            }
             return;
         }
 
@@ -151,7 +148,14 @@ public final class MultiDex {
                     return;
                 }
 
-                File dexDir = new File(context.getFilesDir(), SECONDARY_FOLDER_NAME);
+                try {
+                  clearOldDexDir(context);
+                } catch (Throwable t) {
+                  Log.w(TAG, "Something went wrong when trying to clear old MultiDex extraction, "
+                      + "continuing without cleaning.", t);
+                }
+
+                File dexDir = new File(applicationInfo.dataDir, SECONDARY_FOLDER_NAME);
                 List<File> files = MultiDexExtractor.load(context, applicationInfo, dexDir, false);
                 if (checkValidZipFiles(files)) {
                     installSecondaryDexes(loader, dexDir, files);
@@ -334,20 +338,7 @@ public final class MultiDex {
     }
 
     private static void clearOldDexDir(Context context) throws Exception {
-        ApplicationInfo applicationInfo = getApplicationInfo(context);
-        if (applicationInfo == null) {
-            // Looks like running on a test Context, so just return.
-            return;
-        }
-
-        synchronized (installedApk) {
-            String apkPath = applicationInfo.sourceDir;
-            if (installedApk.contains(apkPath)) {
-                return;
-            }
-            installedApk.add(apkPath);
-        }
-        File dexDir = new File(context.getFilesDir(), SECONDARY_FOLDER_NAME);
+        File dexDir = new File(context.getFilesDir(), OLD_SECONDARY_FOLDER_NAME);
         if (dexDir.isDirectory()) {
             Log.i(TAG, "Clearing old secondary dex dir (" + dexDir.getPath() + ").");
             File[] files = dexDir.listFiles();
diff --git a/library/src/android/support/multidex/MultiDexExtractor.java b/library/src/android/support/multidex/MultiDexExtractor.java
index fd70dee..b7e0a11 100644
--- a/library/src/android/support/multidex/MultiDexExtractor.java
+++ b/library/src/android/support/multidex/MultiDexExtractor.java
@@ -84,11 +84,10 @@ final class MultiDexExtractor {
         Log.i(TAG, "MultiDexExtractor.load(" + applicationInfo.sourceDir + ", " + forceReload + ")");
         final File sourceApk = new File(applicationInfo.sourceDir);
 
-        File archive = new File(applicationInfo.sourceDir);
-        long currentCrc = getZipCrc(archive);
+        long currentCrc = getZipCrc(sourceApk);
 
         List<File> files;
-        if (!forceReload && !isModified(context, archive, currentCrc)) {
+        if (!forceReload && !isModified(context, sourceApk, currentCrc)) {
             try {
                 files = loadExistingExtractions(context, sourceApk, dexDir);
             } catch (IOException ioe) {
@@ -254,7 +253,7 @@ final class MultiDexExtractor {
      */
     private static void prepareDexDir(File dexDir, final String extractedFilePrefix)
             throws IOException {
-        dexDir.mkdir();
+        dexDir.mkdirs();
         if (!dexDir.isDirectory()) {
             throw new IOException("Failed to create dex directory " + dexDir.getPath());
         }
-- 
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