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/*
* Copyright 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 "examples/unityplugin/class_reference_holder.h"
#include <utility>
#include "sdk/android/src/jni/jni_helpers.h"
namespace unity_plugin {
// ClassReferenceHolder holds global reference to Java classes in app/webrtc.
class ClassReferenceHolder {
public:
explicit ClassReferenceHolder(JNIEnv* jni);
~ClassReferenceHolder();
void FreeReferences(JNIEnv* jni);
jclass GetClass(const std::string& name);
void LoadClass(JNIEnv* jni, const std::string& name);
private:
std::map<std::string, jclass> classes_;
};
// Allocated in LoadGlobalClassReferenceHolder(),
// freed in FreeGlobalClassReferenceHolder().
static ClassReferenceHolder* g_class_reference_holder = nullptr;
void LoadGlobalClassReferenceHolder() {
RTC_CHECK(g_class_reference_holder == nullptr);
g_class_reference_holder = new ClassReferenceHolder(webrtc::jni::GetEnv());
}
void FreeGlobalClassReferenceHolder() {
g_class_reference_holder->FreeReferences(
webrtc::jni::AttachCurrentThreadIfNeeded());
delete g_class_reference_holder;
g_class_reference_holder = nullptr;
}
ClassReferenceHolder::ClassReferenceHolder(JNIEnv* jni) {
LoadClass(jni, "org/webrtc/UnityUtility");
}
ClassReferenceHolder::~ClassReferenceHolder() {
RTC_CHECK(classes_.empty()) << "Must call FreeReferences() before dtor!";
}
void ClassReferenceHolder::FreeReferences(JNIEnv* jni) {
for (std::map<std::string, jclass>::const_iterator it = classes_.begin();
it != classes_.end(); ++it) {
jni->DeleteGlobalRef(it->second);
}
classes_.clear();
}
jclass ClassReferenceHolder::GetClass(const std::string& name) {
std::map<std::string, jclass>::iterator it = classes_.find(name);
RTC_CHECK(it != classes_.end()) << "Unexpected GetClass() call for: " << name;
return it->second;
}
void ClassReferenceHolder::LoadClass(JNIEnv* jni, const std::string& name) {
jclass localRef = jni->FindClass(name.c_str());
CHECK_EXCEPTION(jni) << "error during FindClass: " << name;
RTC_CHECK(localRef) << name;
jclass globalRef = reinterpret_cast<jclass>(jni->NewGlobalRef(localRef));
CHECK_EXCEPTION(jni) << "error during NewGlobalRef: " << name;
RTC_CHECK(globalRef) << name;
bool inserted = classes_.insert(std::make_pair(name, globalRef)).second;
RTC_CHECK(inserted) << "Duplicate class name: " << name;
}
// Returns a global reference guaranteed to be valid for the lifetime of the
// process.
jclass FindClass(JNIEnv* jni, const char* name) {
return g_class_reference_holder->GetClass(name);
}
} // namespace unity_plugin
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