1 files changed, 114 insertions, 0 deletions
diff --git a/tools/preload/Policy.java b/tools/preload/Policy.java
new file mode 100644
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--- /dev/null
+++ b/tools/preload/Policy.java
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+/*
+ * Copyright (C) 2008 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.
+ */
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * This is not instantiated - we just provide data for other classes to use
+ */
+public class Policy {
+    
+    /**
+     * This location (in the build system) of the preloaded-classes file.
+     */
+    private static final String PRELOADED_CLASS_FILE = "frameworks/base/preloaded-classes";
+    
+    /**
+     * The internal process name of the system process.  Note, this also shows up as
+     * "system_process", e.g. in ddms.
+     */
+    private static final String SYSTEM_SERVER_PROCESS_NAME = "system_server";
+
+    /** 
+     * Names of non-application processes - these will not be checked for preloaded classes.
+     * 
+     * TODO: Replace this hardcoded list with a walk up the parent chain looking for zygote.
+     */
+    private static final Set<String> NOT_FROM_ZYGOTE = new HashSet<String>(Arrays.asList(
+            "zygote",
+            "dexopt",
+            "unknown",
+            SYSTEM_SERVER_PROCESS_NAME,
+            "com.android.development",
+            "app_process" // am & other shell commands
+    ));
+
+    /** 
+     * Long running services.  These are restricted in their contribution to the preloader
+     * because their launch time is less critical.
+     */
+    private static final Set<String> SERVICES = new HashSet<String>(Arrays.asList(
+            SYSTEM_SERVER_PROCESS_NAME,
+            "com.android.acore",
+         // Commented out to make sure DefaultTimeZones gets preloaded.
+         // "com.android.phone",
+            "com.google.process.content",
+            "android.process.media"
+    ));
+
+    /**
+     * Classes which we shouldn't load from the Zygote.
+     */
+    private static final Set<String> EXCLUDED_CLASSES = new HashSet<String>(Arrays.asList(
+        // Binders
+        "android.app.AlarmManager",
+        "android.app.SearchManager",
+        "android.os.FileObserver",
+        "com.android.server.PackageManagerService$AppDirObserver",
+
+        // Threads
+        "android.os.AsyncTask",
+        "android.pim.ContactsAsyncHelper",
+        "java.lang.ProcessManager"
+        
+    ));
+
+    /**
+     * No constructor - use static methods only
+     */
+    private Policy() {}
+    
+    /**
+     * Returns the path/file name of the preloaded classes file that will be written 
+     * by WritePreloadedClassFile.
+     */
+    public static String getPreloadedClassFileName() {
+        return PRELOADED_CLASS_FILE;
+    }
+    
+    /**
+     * Reports if a given process name was created from zygote
+     */
+    public static boolean isFromZygote(String processName) {
+        return !NOT_FROM_ZYGOTE.contains(processName);
+    }
+    
+    /**
+     * Reports if the given process name is a "long running" process or service
+     */
+    public static boolean isService(String processName) {
+        return SERVICES.contains(processName);
+    }
+    
+    /**
+     * Reports if the given class should never be preloaded
+     */
+    public static boolean isPreloadableClass(String className) {
+        return !EXCLUDED_CLASSES.contains(className);
+    }
+}