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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/android/jni_android.h"
#include "base/at_exit.h"
#include "base/logging.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace android {
namespace {
base::subtle::AtomicWord g_atomic_id = 0;
int LazyMethodIDCall(JNIEnv* env, jclass clazz, int p) {
jmethodID id = base::android::MethodID::LazyGet<
base::android::MethodID::TYPE_STATIC>(
env, clazz,
"abs",
"(I)I",
&g_atomic_id);
return env->CallStaticIntMethod(clazz, id, p);
}
int MethodIDCall(JNIEnv* env, jclass clazz, jmethodID id, int p) {
return env->CallStaticIntMethod(clazz, id, p);
}
} // namespace
TEST(JNIAndroidMicrobenchmark, MethodId) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jclass> clazz(GetClass(env, "java/lang/Math"));
base::Time start_lazy = base::Time::Now();
int o = 0;
for (int i = 0; i < 1024; ++i)
o += LazyMethodIDCall(env, clazz.obj(), i);
base::Time end_lazy = base::Time::Now();
jmethodID id = reinterpret_cast<jmethodID>(g_atomic_id);
base::Time start = base::Time::Now();
for (int i = 0; i < 1024; ++i)
o += MethodIDCall(env, clazz.obj(), id, i);
base::Time end = base::Time::Now();
// On a Galaxy Nexus, results were in the range of:
// JNI LazyMethodIDCall (us) 1984
// JNI MethodIDCall (us) 1861
LOG(ERROR) << "JNI LazyMethodIDCall (us) " <<
base::TimeDelta(end_lazy - start_lazy).InMicroseconds();
LOG(ERROR) << "JNI MethodIDCall (us) " <<
base::TimeDelta(end - start).InMicroseconds();
LOG(ERROR) << "JNI " << o;
}
} // namespace android
} // namespace base
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