base/android/jni_android_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/android/jni_android.h"
   6
   7 #include "base/at_exit.h"
   8 #include "base/logging.h"
   9 #include "testing/gtest/include/gtest/gtest.h"
  10
  11 namespace base {
  12 namespace android {
  13
  14 namespace {
  15
  16 base::subtle::AtomicWord g_atomic_id = 0;
  17 int LazyMethodIDCall(JNIEnv* env, jclass clazz, int p) {
  18   jmethodID id = base::android::MethodID::LazyGet<
  19       base::android::MethodID::TYPE_STATIC>(
  20       env, clazz,
  21       "abs",
  22       "(I)I",
  23       &g_atomic_id);
  24
  25   return env->CallStaticIntMethod(clazz, id, p);
  26 }
  27
  28 int MethodIDCall(JNIEnv* env, jclass clazz, jmethodID id, int p) {
  29   return env->CallStaticIntMethod(clazz, id, p);
  30 }
  31
  32 }  // namespace
  33
  34 TEST(JNIAndroidMicrobenchmark, MethodId) {
  35   JNIEnv* env = AttachCurrentThread();
  36   ScopedJavaLocalRef<jclass> clazz(GetClass(env, "java/lang/Math"));
  37   base::Time start_lazy = base::Time::Now();
  38   int o = 0;
  39   for (int i = 0; i < 1024; ++i)
  40     o += LazyMethodIDCall(env, clazz.obj(), i);
  41   base::Time end_lazy = base::Time::Now();
  42
  43   jmethodID id = reinterpret_cast<jmethodID>(g_atomic_id);
  44   base::Time start = base::Time::Now();
  45   for (int i = 0; i < 1024; ++i)
  46     o += MethodIDCall(env, clazz.obj(), id, i);
  47   base::Time end = base::Time::Now();
  48
  49   // On a Galaxy Nexus, results were in the range of:
  50   // JNI LazyMethodIDCall (us) 1984
  51   // JNI MethodIDCall (us) 1861
  52   LOG(ERROR) << "JNI LazyMethodIDCall (us) " <<
  53       base::TimeDelta(end_lazy - start_lazy).InMicroseconds();
  54   LOG(ERROR) << "JNI MethodIDCall (us) " <<
  55       base::TimeDelta(end - start).InMicroseconds();
  56   LOG(ERROR) << "JNI " << o;
  57 }
  58
  59
  60 }  // namespace android
  61 }  // namespace base