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| 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/scoped_java_ref.h" | |
| 6 | |
| 7 #include "base/android/jni_android.h" | |
| 8 #include "base/android/jni_string.h" | |
| 9 #include "testing/gtest/include/gtest/gtest.h" | |
| 10 | |
| 11 namespace base { | |
| 12 namespace android { | |
| 13 | |
| 14 namespace { | |
| 15 int g_local_refs = 0; | |
| 16 int g_global_refs = 0; | |
| 17 | |
| 18 const JNINativeInterface* g_previous_functions; | |
| 19 | |
| 20 jobject NewGlobalRef(JNIEnv* env, jobject obj) { | |
| 21 ++g_global_refs; | |
| 22 return g_previous_functions->NewGlobalRef(env, obj); | |
| 23 } | |
| 24 | |
| 25 void DeleteGlobalRef(JNIEnv* env, jobject obj) { | |
| 26 --g_global_refs; | |
| 27 return g_previous_functions->DeleteGlobalRef(env, obj); | |
| 28 } | |
| 29 | |
| 30 jobject NewLocalRef(JNIEnv* env, jobject obj) { | |
| 31 ++g_local_refs; | |
| 32 return g_previous_functions->NewLocalRef(env, obj); | |
| 33 } | |
| 34 | |
| 35 void DeleteLocalRef(JNIEnv* env, jobject obj) { | |
| 36 --g_local_refs; | |
| 37 return g_previous_functions->DeleteLocalRef(env, obj); | |
| 38 } | |
| 39 } // namespace | |
| 40 | |
| 41 class ScopedJavaRefTest : public testing::Test { | |
| 42 protected: | |
| 43 void SetUp() override { | |
| 44 g_local_refs = 0; | |
| 45 g_global_refs = 0; | |
| 46 JNIEnv* env = AttachCurrentThread(); | |
| 47 g_previous_functions = env->functions; | |
| 48 hooked_functions = *g_previous_functions; | |
| 49 env->functions = &hooked_functions; | |
| 50 // We inject our own functions in JNINativeInterface so we can keep track | |
| 51 // of the reference counting ourselves. | |
| 52 hooked_functions.NewGlobalRef = &NewGlobalRef; | |
| 53 hooked_functions.DeleteGlobalRef = &DeleteGlobalRef; | |
| 54 hooked_functions.NewLocalRef = &NewLocalRef; | |
| 55 hooked_functions.DeleteLocalRef = &DeleteLocalRef; | |
| 56 } | |
| 57 | |
| 58 void TearDown() override { | |
| 59 JNIEnv* env = AttachCurrentThread(); | |
| 60 env->functions = g_previous_functions; | |
| 61 } | |
| 62 // From JellyBean release, the instance of this struct provided in JNIEnv is | |
| 63 // read-only, so we deep copy it to allow individual functions to be hooked. | |
| 64 JNINativeInterface hooked_functions; | |
| 65 }; | |
| 66 | |
| 67 // The main purpose of this is testing the various conversions compile. | |
| 68 TEST_F(ScopedJavaRefTest, Conversions) { | |
| 69 JNIEnv* env = AttachCurrentThread(); | |
| 70 ScopedJavaLocalRef<jstring> str = ConvertUTF8ToJavaString(env, "string"); | |
| 71 ScopedJavaGlobalRef<jstring> global(str); | |
| 72 { | |
| 73 ScopedJavaGlobalRef<jobject> global_obj(str); | |
| 74 ScopedJavaLocalRef<jobject> local_obj(global); | |
| 75 const JavaRef<jobject>& obj_ref1(str); | |
| 76 const JavaRef<jobject>& obj_ref2(global); | |
| 77 EXPECT_TRUE(env->IsSameObject(obj_ref1.obj(), obj_ref2.obj())); | |
| 78 EXPECT_TRUE(env->IsSameObject(global_obj.obj(), obj_ref2.obj())); | |
| 79 } | |
| 80 global.Reset(str); | |
| 81 const JavaRef<jstring>& str_ref = str; | |
| 82 EXPECT_EQ("string", ConvertJavaStringToUTF8(str_ref)); | |
| 83 str.Reset(); | |
| 84 } | |
| 85 | |
| 86 TEST_F(ScopedJavaRefTest, RefCounts) { | |
| 87 JNIEnv* env = AttachCurrentThread(); | |
| 88 ScopedJavaLocalRef<jstring> str; | |
| 89 // The ConvertJavaStringToUTF8 below creates a new string that would normally | |
| 90 // return a local ref. We simulate that by starting the g_local_refs count at | |
| 91 // 1. | |
| 92 g_local_refs = 1; | |
| 93 str.Reset(ConvertUTF8ToJavaString(env, "string")); | |
| 94 EXPECT_EQ(1, g_local_refs); | |
| 95 EXPECT_EQ(0, g_global_refs); | |
| 96 { | |
| 97 ScopedJavaGlobalRef<jstring> global_str(str); | |
| 98 ScopedJavaGlobalRef<jobject> global_obj(global_str); | |
| 99 EXPECT_EQ(1, g_local_refs); | |
| 100 EXPECT_EQ(2, g_global_refs); | |
| 101 | |
| 102 ScopedJavaLocalRef<jstring> str2(env, str.Release()); | |
| 103 EXPECT_EQ(1, g_local_refs); | |
| 104 { | |
| 105 ScopedJavaLocalRef<jstring> str3(str2); | |
| 106 EXPECT_EQ(2, g_local_refs); | |
| 107 } | |
| 108 EXPECT_EQ(1, g_local_refs); | |
| 109 str2.Reset(); | |
| 110 EXPECT_EQ(0, g_local_refs); | |
| 111 global_str.Reset(); | |
| 112 EXPECT_EQ(1, g_global_refs); | |
| 113 ScopedJavaGlobalRef<jobject> global_obj2(global_obj); | |
| 114 EXPECT_EQ(2, g_global_refs); | |
| 115 } | |
| 116 | |
| 117 EXPECT_EQ(0, g_local_refs); | |
| 118 EXPECT_EQ(0, g_global_refs); | |
| 119 } | |
| 120 | |
| 121 } // namespace android | |
| 122 } // namespace base | |
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