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/*
* Copyright (C) 2006 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 android.app;
import android.os.Build;
import android.os.GraphicsEnvironment;
import android.os.Trace;
import android.util.ArrayMap;
import com.android.internal.os.ClassLoaderFactory;
import dalvik.system.PathClassLoader;
/** @hide */
public class ApplicationLoaders {
public static ApplicationLoaders getDefault() {
return gApplicationLoaders;
}
ClassLoader getClassLoader(String zip, int targetSdkVersion, boolean isBundled,
String librarySearchPath, String libraryPermittedPath,
ClassLoader parent, String classLoaderName) {
// For normal usage the cache key used is the same as the zip path.
return getClassLoader(zip, targetSdkVersion, isBundled, librarySearchPath,
libraryPermittedPath, parent, zip, classLoaderName);
}
private ClassLoader getClassLoader(String zip, int targetSdkVersion, boolean isBundled,
String librarySearchPath, String libraryPermittedPath,
ClassLoader parent, String cacheKey,
String classLoaderName) {
/*
* This is the parent we use if they pass "null" in. In theory
* this should be the "system" class loader; in practice we
* don't use that and can happily (and more efficiently) use the
* bootstrap class loader.
*/
ClassLoader baseParent = ClassLoader.getSystemClassLoader().getParent();
synchronized (mLoaders) {
if (parent == null) {
parent = baseParent;
}
/*
* If we're one step up from the base class loader, find
* something in our cache. Otherwise, we create a whole
* new ClassLoader for the zip archive.
*/
if (parent == baseParent) {
ClassLoader loader = mLoaders.get(cacheKey);
if (loader != null) {
return loader;
}
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, zip);
ClassLoader classloader = ClassLoaderFactory.createClassLoader(
zip, librarySearchPath, libraryPermittedPath, parent,
targetSdkVersion, isBundled, classLoaderName);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "setLayerPaths");
GraphicsEnvironment.getInstance().setLayerPaths(
classloader, librarySearchPath, libraryPermittedPath);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
mLoaders.put(cacheKey, classloader);
return classloader;
}
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, zip);
ClassLoader loader = ClassLoaderFactory.createClassLoader(
zip, null, parent, classLoaderName);
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
return loader;
}
}
/**
* Creates a classloader for the WebView APK and places it in the cache of loaders maintained
* by this class. This is used in the WebView zygote, where its presence in the cache speeds up
* startup and enables memory sharing.
*/
public ClassLoader createAndCacheWebViewClassLoader(String packagePath, String libsPath,
String cacheKey) {
// The correct paths are calculated by WebViewZygote in the system server and passed to
// us here. We hardcode the other parameters: WebView always targets the current SDK,
// does not need to use non-public system libraries, and uses the base classloader as its
// parent to permit usage of the cache.
// The cache key is passed separately to enable the stub WebView to be cached under the
// stub's APK path, when the actual package path is the donor APK.
return getClassLoader(packagePath, Build.VERSION.SDK_INT, false, libsPath, null, null,
cacheKey, null /* classLoaderName */);
}
/**
* Adds a new path the classpath of the given loader.
* @throws IllegalStateException if the provided class loader is not a {@link PathClassLoader}.
*/
void addPath(ClassLoader classLoader, String dexPath) {
if (!(classLoader instanceof PathClassLoader)) {
throw new IllegalStateException("class loader is not a PathClassLoader");
}
final PathClassLoader baseDexClassLoader = (PathClassLoader) classLoader;
baseDexClassLoader.addDexPath(dexPath);
}
private final ArrayMap<String, ClassLoader> mLoaders = new ArrayMap<>();
private static final ApplicationLoaders gApplicationLoaders = new ApplicationLoaders();
}
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