1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
// 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/observer_list.h"
#include <vector>
#include <gtest/gtest.h>
#include "base/compiler_specific.h"
#include "base/location.h"
#include "base/memory/weak_ptr.h"
namespace base {
namespace {
class Foo {
public:
virtual void Observe(int x) = 0;
virtual ~Foo() {}
};
class Adder : public Foo {
public:
explicit Adder(int scaler) : total(0), scaler_(scaler) {}
void Observe(int x) override { total += x * scaler_; }
~Adder() override {}
int total;
private:
int scaler_;
};
class Disrupter : public Foo {
public:
Disrupter(ObserverList<Foo>* list, Foo* doomed)
: list_(list),
doomed_(doomed) {
}
~Disrupter() override {}
void Observe(int x) override { list_->RemoveObserver(doomed_); }
private:
ObserverList<Foo>* list_;
Foo* doomed_;
};
template <typename ObserverListType>
class AddInObserve : public Foo {
public:
explicit AddInObserve(ObserverListType* observer_list)
: added(false),
observer_list(observer_list),
adder(1) {
}
void Observe(int x) override {
if (!added) {
added = true;
observer_list->AddObserver(&adder);
}
}
bool added;
ObserverListType* observer_list;
Adder adder;
};
TEST(ObserverListTest, BasicTest) {
ObserverList<Foo> observer_list;
Adder a(1), b(-1), c(1), d(-1), e(-1);
Disrupter evil(&observer_list, &c);
observer_list.AddObserver(&a);
observer_list.AddObserver(&b);
EXPECT_TRUE(observer_list.HasObserver(&a));
EXPECT_FALSE(observer_list.HasObserver(&c));
FOR_EACH_OBSERVER(Foo, observer_list, Observe(10));
observer_list.AddObserver(&evil);
observer_list.AddObserver(&c);
observer_list.AddObserver(&d);
// Removing an observer not in the list should do nothing.
observer_list.RemoveObserver(&e);
FOR_EACH_OBSERVER(Foo, observer_list, Observe(10));
EXPECT_EQ(20, a.total);
EXPECT_EQ(-20, b.total);
EXPECT_EQ(0, c.total);
EXPECT_EQ(-10, d.total);
EXPECT_EQ(0, e.total);
}
TEST(ObserverListTest, Existing) {
ObserverList<Foo> observer_list(ObserverList<Foo>::NOTIFY_EXISTING_ONLY);
Adder a(1);
AddInObserve<ObserverList<Foo> > b(&observer_list);
observer_list.AddObserver(&a);
observer_list.AddObserver(&b);
FOR_EACH_OBSERVER(Foo, observer_list, Observe(1));
EXPECT_TRUE(b.added);
// B's adder should not have been notified because it was added during
// notification.
EXPECT_EQ(0, b.adder.total);
// Notify again to make sure b's adder is notified.
FOR_EACH_OBSERVER(Foo, observer_list, Observe(1));
EXPECT_EQ(1, b.adder.total);
}
class AddInClearObserve : public Foo {
public:
explicit AddInClearObserve(ObserverList<Foo>* list)
: list_(list), added_(false), adder_(1) {}
void Observe(int /* x */) override {
list_->Clear();
list_->AddObserver(&adder_);
added_ = true;
}
bool added() const { return added_; }
const Adder& adder() const { return adder_; }
private:
ObserverList<Foo>* const list_;
bool added_;
Adder adder_;
};
TEST(ObserverListTest, ClearNotifyAll) {
ObserverList<Foo> observer_list;
AddInClearObserve a(&observer_list);
observer_list.AddObserver(&a);
FOR_EACH_OBSERVER(Foo, observer_list, Observe(1));
EXPECT_TRUE(a.added());
EXPECT_EQ(1, a.adder().total)
<< "Adder should observe once and have sum of 1.";
}
TEST(ObserverListTest, ClearNotifyExistingOnly) {
ObserverList<Foo> observer_list(ObserverList<Foo>::NOTIFY_EXISTING_ONLY);
AddInClearObserve a(&observer_list);
observer_list.AddObserver(&a);
FOR_EACH_OBSERVER(Foo, observer_list, Observe(1));
EXPECT_TRUE(a.added());
EXPECT_EQ(0, a.adder().total)
<< "Adder should not observe, so sum should still be 0.";
}
class ListDestructor : public Foo {
public:
explicit ListDestructor(ObserverList<Foo>* list) : list_(list) {}
~ListDestructor() override {}
void Observe(int x) override { delete list_; }
private:
ObserverList<Foo>* list_;
};
TEST(ObserverListTest, IteratorOutlivesList) {
ObserverList<Foo>* observer_list = new ObserverList<Foo>;
ListDestructor a(observer_list);
observer_list->AddObserver(&a);
FOR_EACH_OBSERVER(Foo, *observer_list, Observe(0));
// If this test fails, there'll be Valgrind errors when this function goes out
// of scope.
}
} // namespace
} // namespace base
|
