blob: e0c66d5fe1b39aa3331f493cd127463538704732 [file] [log] [blame]
/*
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/utility/include/jvm_android.h"
#include <android/log.h>
#include <memory>
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/platform_thread.h"
namespace webrtc {
JVM* g_jvm;
// TODO(henrika): add more clases here if needed.
struct {
const char* name;
jclass clazz;
} loaded_classes[] = {
};
// Android's FindClass() is trickier than usual because the app-specific
// ClassLoader is not consulted when there is no app-specific frame on the
// stack. Consequently, we only look up all classes once in native WebRTC.
// http://developer.android.com/training/articles/perf-jni.html#faq_FindClass
void LoadClasses(JNIEnv* jni) {
RTC_LOG(LS_INFO) << "LoadClasses:";
for (auto& c : loaded_classes) {
jclass localRef = FindClass(jni, c.name);
RTC_LOG(LS_INFO) << "name: " << c.name;
CHECK_EXCEPTION(jni) << "Error during FindClass: " << c.name;
RTC_CHECK(localRef) << c.name;
jclass globalRef = reinterpret_cast<jclass>(jni->NewGlobalRef(localRef));
CHECK_EXCEPTION(jni) << "Error during NewGlobalRef: " << c.name;
RTC_CHECK(globalRef) << c.name;
c.clazz = globalRef;
}
}
void FreeClassReferences(JNIEnv* jni) {
for (auto& c : loaded_classes) {
jni->DeleteGlobalRef(c.clazz);
c.clazz = nullptr;
}
}
jclass LookUpClass(const char* name) {
for (auto& c : loaded_classes) {
if (strcmp(c.name, name) == 0)
return c.clazz;
}
RTC_CHECK(false) << "Unable to find class in lookup table";
return 0;
}
// JvmThreadConnector implementation.
JvmThreadConnector::JvmThreadConnector() : attached_(false) {
RTC_LOG(LS_INFO) << "JvmThreadConnector::ctor";
JavaVM* jvm = JVM::GetInstance()->jvm();
RTC_CHECK(jvm);
JNIEnv* jni = GetEnv(jvm);
if (!jni) {
RTC_LOG(LS_INFO) << "Attaching thread to JVM";
JNIEnv* env = nullptr;
jint ret = jvm->AttachCurrentThread(&env, nullptr);
attached_ = (ret == JNI_OK);
}
}
JvmThreadConnector::~JvmThreadConnector() {
RTC_LOG(LS_INFO) << "JvmThreadConnector::dtor";
RTC_DCHECK(thread_checker_.IsCurrent());
if (attached_) {
RTC_LOG(LS_INFO) << "Detaching thread from JVM";
jint res = JVM::GetInstance()->jvm()->DetachCurrentThread();
RTC_CHECK(res == JNI_OK) << "DetachCurrentThread failed: " << res;
}
}
// GlobalRef implementation.
GlobalRef::GlobalRef(JNIEnv* jni, jobject object)
: jni_(jni), j_object_(NewGlobalRef(jni, object)) {
RTC_LOG(LS_INFO) << "GlobalRef::ctor";
}
GlobalRef::~GlobalRef() {
RTC_LOG(LS_INFO) << "GlobalRef::dtor";
DeleteGlobalRef(jni_, j_object_);
}
jboolean GlobalRef::CallBooleanMethod(jmethodID methodID, ...) {
va_list args;
va_start(args, methodID);
jboolean res = jni_->CallBooleanMethodV(j_object_, methodID, args);
CHECK_EXCEPTION(jni_) << "Error during CallBooleanMethod";
va_end(args);
return res;
}
jint GlobalRef::CallIntMethod(jmethodID methodID, ...) {
va_list args;
va_start(args, methodID);
jint res = jni_->CallIntMethodV(j_object_, methodID, args);
CHECK_EXCEPTION(jni_) << "Error during CallIntMethod";
va_end(args);
return res;
}
void GlobalRef::CallVoidMethod(jmethodID methodID, ...) {
va_list args;
va_start(args, methodID);
jni_->CallVoidMethodV(j_object_, methodID, args);
CHECK_EXCEPTION(jni_) << "Error during CallVoidMethod";
va_end(args);
}
// NativeRegistration implementation.
NativeRegistration::NativeRegistration(JNIEnv* jni, jclass clazz)
: JavaClass(jni, clazz), jni_(jni) {
RTC_LOG(LS_INFO) << "NativeRegistration::ctor";
}
NativeRegistration::~NativeRegistration() {
RTC_LOG(LS_INFO) << "NativeRegistration::dtor";
jni_->UnregisterNatives(j_class_);
CHECK_EXCEPTION(jni_) << "Error during UnregisterNatives";
}
std::unique_ptr<GlobalRef> NativeRegistration::NewObject(const char* name,
const char* signature,
...) {
RTC_LOG(LS_INFO) << "NativeRegistration::NewObject";
va_list args;
va_start(args, signature);
jobject obj = jni_->NewObjectV(
j_class_, GetMethodID(jni_, j_class_, name, signature), args);
CHECK_EXCEPTION(jni_) << "Error during NewObjectV";
va_end(args);
return std::unique_ptr<GlobalRef>(new GlobalRef(jni_, obj));
}
// JavaClass implementation.
jmethodID JavaClass::GetMethodId(const char* name, const char* signature) {
return GetMethodID(jni_, j_class_, name, signature);
}
jmethodID JavaClass::GetStaticMethodId(const char* name,
const char* signature) {
return GetStaticMethodID(jni_, j_class_, name, signature);
}
jobject JavaClass::CallStaticObjectMethod(jmethodID methodID, ...) {
va_list args;
va_start(args, methodID);
jobject res = jni_->CallStaticObjectMethodV(j_class_, methodID, args);
CHECK_EXCEPTION(jni_) << "Error during CallStaticObjectMethod";
return res;
}
jint JavaClass::CallStaticIntMethod(jmethodID methodID, ...) {
va_list args;
va_start(args, methodID);
jint res = jni_->CallStaticIntMethodV(j_class_, methodID, args);
CHECK_EXCEPTION(jni_) << "Error during CallStaticIntMethod";
return res;
}
// JNIEnvironment implementation.
JNIEnvironment::JNIEnvironment(JNIEnv* jni) : jni_(jni) {
RTC_LOG(LS_INFO) << "JNIEnvironment::ctor";
}
JNIEnvironment::~JNIEnvironment() {
RTC_LOG(LS_INFO) << "JNIEnvironment::dtor";
RTC_DCHECK(thread_checker_.IsCurrent());
}
std::unique_ptr<NativeRegistration> JNIEnvironment::RegisterNatives(
const char* name,
const JNINativeMethod* methods,
int num_methods) {
RTC_LOG(LS_INFO) << "JNIEnvironment::RegisterNatives: " << name;
RTC_DCHECK(thread_checker_.IsCurrent());
jclass clazz = LookUpClass(name);
jni_->RegisterNatives(clazz, methods, num_methods);
CHECK_EXCEPTION(jni_) << "Error during RegisterNatives";
return std::unique_ptr<NativeRegistration>(
new NativeRegistration(jni_, clazz));
}
std::string JNIEnvironment::JavaToStdString(const jstring& j_string) {
RTC_DCHECK(thread_checker_.IsCurrent());
const char* jchars = jni_->GetStringUTFChars(j_string, nullptr);
CHECK_EXCEPTION(jni_);
const int size = jni_->GetStringUTFLength(j_string);
CHECK_EXCEPTION(jni_);
std::string ret(jchars, size);
jni_->ReleaseStringUTFChars(j_string, jchars);
CHECK_EXCEPTION(jni_);
return ret;
}
// static
void JVM::Initialize(JavaVM* jvm) {
RTC_LOG(LS_INFO) << "JVM::Initialize";
RTC_CHECK(!g_jvm);
g_jvm = new JVM(jvm);
}
void JVM::Initialize(JavaVM* jvm, jobject context) {
Initialize(jvm);
// Pass in the context to the new ContextUtils class.
JNIEnv* jni = g_jvm->jni();
jclass context_utils = FindClass(jni, "org/webrtc/ContextUtils");
jmethodID initialize_method = jni->GetStaticMethodID(
context_utils, "initialize", "(Landroid/content/Context;)V");
jni->CallStaticVoidMethod(context_utils, initialize_method, context);
}
// static
void JVM::Uninitialize() {
RTC_LOG(LS_INFO) << "JVM::Uninitialize";
RTC_DCHECK(g_jvm);
delete g_jvm;
g_jvm = nullptr;
}
// static
JVM* JVM::GetInstance() {
RTC_DCHECK(g_jvm);
return g_jvm;
}
JVM::JVM(JavaVM* jvm) : jvm_(jvm) {
RTC_LOG(LS_INFO) << "JVM::JVM";
RTC_CHECK(jni()) << "AttachCurrentThread() must be called on this thread.";
LoadClasses(jni());
}
JVM::~JVM() {
RTC_LOG(LS_INFO) << "JVM::~JVM";
RTC_DCHECK(thread_checker_.IsCurrent());
FreeClassReferences(jni());
}
std::unique_ptr<JNIEnvironment> JVM::environment() {
RTC_LOG(LS_INFO) << "JVM::environment";
;
// The JNIEnv is used for thread-local storage. For this reason, we cannot
// share a JNIEnv between threads. If a piece of code has no other way to get
// its JNIEnv, we should share the JavaVM, and use GetEnv to discover the
// thread's JNIEnv. (Assuming it has one, if not, use AttachCurrentThread).
// See // http://developer.android.com/training/articles/perf-jni.html.
JNIEnv* jni = GetEnv(jvm_);
if (!jni) {
RTC_LOG(LS_ERROR)
<< "AttachCurrentThread() has not been called on this thread";
return std::unique_ptr<JNIEnvironment>();
}
return std::unique_ptr<JNIEnvironment>(new JNIEnvironment(jni));
}
JavaClass JVM::GetClass(const char* name) {
RTC_LOG(LS_INFO) << "JVM::GetClass: " << name;
RTC_DCHECK(thread_checker_.IsCurrent());
return JavaClass(jni(), LookUpClass(name));
}
} // namespace webrtc