1 /* 2 * Copyright (C) 2017 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 17 #include <android_runtime/AndroidRuntime.h> 18 #include <log/log.h> 19 20 #include <string> 21 22 // Use reflection to query the default cache dir. 23 // The function is NOT thread-safe. It is expected to be called 24 // at most once per process. 25 extern "C" const char* rsQueryCacheDir() { 26 static std::string cacheDir; 27 // First check if we have JavaVM running in this process. 28 if (android::AndroidRuntime::getJavaVM()) { 29 JNIEnv* env = android::AndroidRuntime::getJNIEnv(); 30 if (env) { 31 jclass cacheDirClass = env->FindClass("android/renderscript/RenderScriptCacheDir"); 32 jfieldID cacheDirID = env->GetStaticFieldID(cacheDirClass, "mCacheDir", "Ljava/io/File;"); 33 jobject cache_dir = env->GetStaticObjectField(cacheDirClass, cacheDirID); 34 35 if (cache_dir) { 36 jclass fileClass = env->FindClass("java/io/File"); 37 jmethodID getPath = env->GetMethodID(fileClass, "getPath", "()Ljava/lang/String;"); 38 jstring path_string = (jstring)env->CallObjectMethod(cache_dir, getPath); 39 const char *path_chars = env->GetStringUTFChars(path_string, NULL); 40 41 ALOGD("Successfully queried cache dir: %s", path_chars); 42 cacheDir = std::string(path_chars); 43 env->ReleaseStringUTFChars(path_string, path_chars); 44 } else { 45 ALOGD("Cache dir not initialized"); 46 } 47 } else { 48 ALOGD("Failed to query the default cache dir."); 49 } 50 } 51 52 return cacheDir.c_str(); 53 } 54 55
