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/*
* Copyright (C) 2018 The Android Open Source Project
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. The Android Open Source
* Project designates this particular file as subject to the "Classpath"
* exception as provided by The Android Open Source Project in the LICENSE
* file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define LOG_TAG "JniConstants"
#include "JniConstants.h"
#include <atomic>
#include <mutex>
#include <log/log.h>
#include <nativehelper/ScopedLocalRef.h>
namespace {
jclass findClass(JNIEnv* env, const char* name) {
ScopedLocalRef<jclass> localClass(env, env->FindClass(name));
jclass result = reinterpret_cast<jclass>(env->NewGlobalRef(localClass.get()));
if (result == NULL) {
ALOGE("failed to find class '%s'", name);
abort();
}
return result;
}
// Mutex protecting static variables
static std::mutex g_constants_mutex;
// Flag indicating whether cached constants are valid
static bool g_constants_valid = false;
// Constants
jclass g_socket_tagger_class;
// EnsureJniConstantsInitialized initializes cache constants. It should be
// called before returning a heap object from the cache to ensure cache is
// initialized. This pattern is only necessary because if a process finishes one
// runtime and starts another then JNI_OnLoad may not be called.
void EnsureJniConstantsInitialized(JNIEnv* env) {
if (g_constants_valid) {
return;
}
std::lock_guard guard(g_constants_mutex);
if (g_constants_valid) {
return;
}
g_socket_tagger_class = findClass(env, "dalvik/system/SocketTagger");
g_constants_valid = true;
}
} // namespace
void JniConstants::Initialize(JNIEnv* env) {
EnsureJniConstantsInitialized(env);
}
void JniConstants::Invalidate() {
std::lock_guard guard(g_constants_mutex);
g_constants_valid = false;
}
jclass JniConstants::GetSocketTaggerClass(JNIEnv* env) {
EnsureJniConstantsInitialized(env);
return g_socket_tagger_class;
}
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