Brian Carlstrom | b2acfa2 | 2013-06-19 15:09:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 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 | #ifndef JNI_INVOCATION_H_included |
| 18 | #define JNI_INVOCATION_H_included |
| 19 | |
| 20 | #include <jni.h> |
| 21 | |
| 22 | // JniInvocation adds a layer of indirection for applications using |
| 23 | // the JNI invocation API to allow the JNI implementation to be |
| 24 | // selected dynamically. Apps can specify a specific implementation to |
| 25 | // be used by calling InitJniInvocation. If this is not done, the |
| 26 | // library will chosen based on the value of Android system property |
Brian Carlstrom | df03494 | 2013-06-30 13:12:55 -0700 | [diff] [blame] | 27 | // persist.sys.dalvik.vm.lib on the device, and otherwise fall back to |
| 28 | // a hard-coded default implementation. |
Brian Carlstrom | b2acfa2 | 2013-06-19 15:09:28 -0700 | [diff] [blame] | 29 | class JniInvocation { |
| 30 | public: |
| 31 | JniInvocation(); |
| 32 | |
| 33 | ~JniInvocation(); |
| 34 | |
| 35 | // Initialize JNI invocation API. library should specifiy a valid |
| 36 | // shared library for opening via dlopen providing a JNI invocation |
Brian Carlstrom | df03494 | 2013-06-30 13:12:55 -0700 | [diff] [blame] | 37 | // implementation, or null to allow defaulting via |
| 38 | // persist.sys.dalvik.vm.lib. |
Brian Carlstrom | b2acfa2 | 2013-06-19 15:09:28 -0700 | [diff] [blame] | 39 | bool Init(const char* library); |
| 40 | |
| 41 | private: |
| 42 | |
| 43 | bool FindSymbol(void** pointer, const char* symbol); |
| 44 | |
| 45 | static JniInvocation& GetJniInvocation(); |
| 46 | |
| 47 | jint JNI_GetDefaultJavaVMInitArgs(void* vmargs); |
| 48 | jint JNI_CreateJavaVM(JavaVM** p_vm, JNIEnv** p_env, void* vm_args); |
| 49 | jint JNI_GetCreatedJavaVMs(JavaVM** vms, jsize size, jsize* vm_count); |
| 50 | |
| 51 | static JniInvocation* jni_invocation_; |
| 52 | |
| 53 | void* handle_; |
| 54 | jint (*JNI_GetDefaultJavaVMInitArgs_)(void*); |
| 55 | jint (*JNI_CreateJavaVM_)(JavaVM**, JNIEnv**, void*); |
| 56 | jint (*JNI_GetCreatedJavaVMs_)(JavaVM**, jsize, jsize*); |
| 57 | |
| 58 | friend jint JNI_GetDefaultJavaVMInitArgs(void* vm_args); |
| 59 | friend jint JNI_CreateJavaVM(JavaVM** p_vm, JNIEnv** p_env, void* vm_args); |
| 60 | friend jint JNI_GetCreatedJavaVMs(JavaVM** vms, jsize size, jsize* vm_count); |
| 61 | }; |
| 62 | |
| 63 | #endif // JNI_INVOCATION_H_included |