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| 1 /* | 1 /* |
| 2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. |
| 3 * | 3 * |
| 4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ | 9 */ |
| 10 | 10 |
| 11 #ifndef WEBRTC_MODULES_UTILITY_INCLUDE_JVM_ANDROID_H_ | 11 #ifndef WEBRTC_MODULES_UTILITY_INCLUDE_JVM_ANDROID_H_ |
| 12 #define WEBRTC_MODULES_UTILITY_INCLUDE_JVM_ANDROID_H_ | 12 #define WEBRTC_MODULES_UTILITY_INCLUDE_JVM_ANDROID_H_ |
| 13 | 13 |
| 14 #include <jni.h> | 14 #include <jni.h> |
| 15 |
| 16 #include <memory> |
| 15 #include <string> | 17 #include <string> |
| 16 | 18 |
| 17 #include "webrtc/base/scoped_ptr.h" | |
| 18 #include "webrtc/base/thread_checker.h" | 19 #include "webrtc/base/thread_checker.h" |
| 19 #include "webrtc/modules/utility/include/helpers_android.h" | 20 #include "webrtc/modules/utility/include/helpers_android.h" |
| 20 | 21 |
| 21 namespace webrtc { | 22 namespace webrtc { |
| 22 | 23 |
| 23 // The JNI interface pointer (JNIEnv) is valid only in the current thread. | 24 // The JNI interface pointer (JNIEnv) is valid only in the current thread. |
| 24 // Should another thread need to access the Java VM, it must first call | 25 // Should another thread need to access the Java VM, it must first call |
| 25 // AttachCurrentThread() to attach itself to the VM and obtain a JNI interface | 26 // AttachCurrentThread() to attach itself to the VM and obtain a JNI interface |
| 26 // pointer. The native thread remains attached to the VM until it calls | 27 // pointer. The native thread remains attached to the VM until it calls |
| 27 // DetachCurrentThread() to detach. | 28 // DetachCurrentThread() to detach. |
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| 69 jclass const j_class_; | 70 jclass const j_class_; |
| 70 }; | 71 }; |
| 71 | 72 |
| 72 // Adds support of the NewObject factory method to the JavaClass class. | 73 // Adds support of the NewObject factory method to the JavaClass class. |
| 73 // See example in JVM for more details on how to use it. | 74 // See example in JVM for more details on how to use it. |
| 74 class NativeRegistration : public JavaClass { | 75 class NativeRegistration : public JavaClass { |
| 75 public: | 76 public: |
| 76 NativeRegistration(JNIEnv* jni, jclass clazz); | 77 NativeRegistration(JNIEnv* jni, jclass clazz); |
| 77 ~NativeRegistration(); | 78 ~NativeRegistration(); |
| 78 | 79 |
| 79 rtc::scoped_ptr<GlobalRef> NewObject( | 80 std::unique_ptr<GlobalRef> NewObject( |
| 80 const char* name, const char* signature, ...); | 81 const char* name, const char* signature, ...); |
| 81 | 82 |
| 82 private: | 83 private: |
| 83 JNIEnv* const jni_; | 84 JNIEnv* const jni_; |
| 84 }; | 85 }; |
| 85 | 86 |
| 86 // This class is created by the JVM class and is used to expose methods that | 87 // This class is created by the JVM class and is used to expose methods that |
| 87 // needs the JNI interface pointer but its main purpose is to create a | 88 // needs the JNI interface pointer but its main purpose is to create a |
| 88 // NativeRegistration object given name of a Java class and a list of native | 89 // NativeRegistration object given name of a Java class and a list of native |
| 89 // methods. See example in JVM for more details. | 90 // methods. See example in JVM for more details. |
| 90 class JNIEnvironment { | 91 class JNIEnvironment { |
| 91 public: | 92 public: |
| 92 explicit JNIEnvironment(JNIEnv* jni); | 93 explicit JNIEnvironment(JNIEnv* jni); |
| 93 ~JNIEnvironment(); | 94 ~JNIEnvironment(); |
| 94 | 95 |
| 95 // Registers native methods with the Java class specified by |name|. | 96 // Registers native methods with the Java class specified by |name|. |
| 96 // Note that the class name must be one of the names in the static | 97 // Note that the class name must be one of the names in the static |
| 97 // |loaded_classes| array defined in jvm_android.cc. | 98 // |loaded_classes| array defined in jvm_android.cc. |
| 98 // This method must be called on the construction thread. | 99 // This method must be called on the construction thread. |
| 99 rtc::scoped_ptr<NativeRegistration> RegisterNatives( | 100 std::unique_ptr<NativeRegistration> RegisterNatives( |
| 100 const char* name, const JNINativeMethod *methods, int num_methods); | 101 const char* name, const JNINativeMethod *methods, int num_methods); |
| 101 | 102 |
| 102 // Converts from Java string to std::string. | 103 // Converts from Java string to std::string. |
| 103 // This method must be called on the construction thread. | 104 // This method must be called on the construction thread. |
| 104 std::string JavaToStdString(const jstring& j_string); | 105 std::string JavaToStdString(const jstring& j_string); |
| 105 | 106 |
| 106 private: | 107 private: |
| 107 rtc::ThreadChecker thread_checker_; | 108 rtc::ThreadChecker thread_checker_; |
| 108 JNIEnv* const jni_; | 109 JNIEnv* const jni_; |
| 109 }; | 110 }; |
| 110 | 111 |
| 111 // Main class for working with Java from C++ using JNI in WebRTC. | 112 // Main class for working with Java from C++ using JNI in WebRTC. |
| 112 // | 113 // |
| 113 // Example usage: | 114 // Example usage: |
| 114 // | 115 // |
| 115 // // At initialization (e.g. in JNI_OnLoad), call JVM::Initialize. | 116 // // At initialization (e.g. in JNI_OnLoad), call JVM::Initialize. |
| 116 // JNIEnv* jni = ::base::android::AttachCurrentThread(); | 117 // JNIEnv* jni = ::base::android::AttachCurrentThread(); |
| 117 // JavaVM* jvm = NULL; | 118 // JavaVM* jvm = NULL; |
| 118 // jni->GetJavaVM(&jvm); | 119 // jni->GetJavaVM(&jvm); |
| 119 // jobject context = ::base::android::GetApplicationContext(); | 120 // jobject context = ::base::android::GetApplicationContext(); |
| 120 // webrtc::JVM::Initialize(jvm, context); | 121 // webrtc::JVM::Initialize(jvm, context); |
| 121 // | 122 // |
| 122 // // Header (.h) file of example class called User. | 123 // // Header (.h) file of example class called User. |
| 123 // rtc::scoped_ptr<JNIEnvironment> env; | 124 // std::unique_ptr<JNIEnvironment> env; |
| 124 // rtc::scoped_ptr<NativeRegistration> reg; | 125 // std::unique_ptr<NativeRegistration> reg; |
| 125 // rtc::scoped_ptr<GlobalRef> obj; | 126 // std::unique_ptr<GlobalRef> obj; |
| 126 // | 127 // |
| 127 // // Construction (in .cc file) of User class. | 128 // // Construction (in .cc file) of User class. |
| 128 // User::User() { | 129 // User::User() { |
| 129 // // Calling thread must be attached to the JVM. | 130 // // Calling thread must be attached to the JVM. |
| 130 // env = JVM::GetInstance()->environment(); | 131 // env = JVM::GetInstance()->environment(); |
| 131 // reg = env->RegisterNatives("org/webrtc/WebRtcTest", ,); | 132 // reg = env->RegisterNatives("org/webrtc/WebRtcTest", ,); |
| 132 // obj = reg->NewObject("<init>", ,); | 133 // obj = reg->NewObject("<init>", ,); |
| 133 // } | 134 // } |
| 134 // | 135 // |
| 135 // // Each User method can now use |reg| and |obj| and call Java functions | 136 // // Each User method can now use |reg| and |obj| and call Java functions |
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| 149 // Clears handles stored in Initialize(). Must be called on same thread as | 150 // Clears handles stored in Initialize(). Must be called on same thread as |
| 150 // Initialize(). | 151 // Initialize(). |
| 151 static void Uninitialize(); | 152 static void Uninitialize(); |
| 152 // Gives access to the global Java VM interface pointer, which then can be | 153 // Gives access to the global Java VM interface pointer, which then can be |
| 153 // used to create a valid JNIEnvironment object or to get a JavaClass object. | 154 // used to create a valid JNIEnvironment object or to get a JavaClass object. |
| 154 static JVM* GetInstance(); | 155 static JVM* GetInstance(); |
| 155 | 156 |
| 156 // Creates a JNIEnvironment object. | 157 // Creates a JNIEnvironment object. |
| 157 // This method returns a NULL pointer if AttachCurrentThread() has not been | 158 // This method returns a NULL pointer if AttachCurrentThread() has not been |
| 158 // called successfully. Use the AttachCurrentThreadIfNeeded class if needed. | 159 // called successfully. Use the AttachCurrentThreadIfNeeded class if needed. |
| 159 rtc::scoped_ptr<JNIEnvironment> environment(); | 160 std::unique_ptr<JNIEnvironment> environment(); |
| 160 | 161 |
| 161 // Returns a JavaClass object given class |name|. | 162 // Returns a JavaClass object given class |name|. |
| 162 // Note that the class name must be one of the names in the static | 163 // Note that the class name must be one of the names in the static |
| 163 // |loaded_classes| array defined in jvm_android.cc. | 164 // |loaded_classes| array defined in jvm_android.cc. |
| 164 // This method must be called on the construction thread. | 165 // This method must be called on the construction thread. |
| 165 JavaClass GetClass(const char* name); | 166 JavaClass GetClass(const char* name); |
| 166 | 167 |
| 167 // TODO(henrika): can we make these private? | 168 // TODO(henrika): can we make these private? |
| 168 JavaVM* jvm() const { return jvm_; } | 169 JavaVM* jvm() const { return jvm_; } |
| 169 jobject context() const { return context_; } | 170 jobject context() const { return context_; } |
| 170 | 171 |
| 171 protected: | 172 protected: |
| 172 JVM(JavaVM* jvm, jobject context); | 173 JVM(JavaVM* jvm, jobject context); |
| 173 ~JVM(); | 174 ~JVM(); |
| 174 | 175 |
| 175 private: | 176 private: |
| 176 JNIEnv* jni() const { return GetEnv(jvm_); } | 177 JNIEnv* jni() const { return GetEnv(jvm_); } |
| 177 | 178 |
| 178 rtc::ThreadChecker thread_checker_; | 179 rtc::ThreadChecker thread_checker_; |
| 179 JavaVM* const jvm_; | 180 JavaVM* const jvm_; |
| 180 jobject context_; | 181 jobject context_; |
| 181 }; | 182 }; |
| 182 | 183 |
| 183 } // namespace webrtc | 184 } // namespace webrtc |
| 184 | 185 |
| 185 #endif // WEBRTC_MODULES_UTILITY_INCLUDE_JVM_ANDROID_H_ | 186 #endif // WEBRTC_MODULES_UTILITY_INCLUDE_JVM_ANDROID_H_ |
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