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// Copyright (c) 2010 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 "testing/gtest/include/gtest/gtest.h"
#include "base/message_loop.h"
#include "base/thread.h"
#include "base/weak_ptr.h"
namespace base {
namespace {
template <class T>
class OffThreadObjectCreator {
public:
static T* NewObject() {
T* result;
{
Thread creator_thread("creator_thread");
creator_thread.Start();
creator_thread.message_loop()->PostTask(
FROM_HERE,
NewRunnableFunction(OffThreadObjectCreator::CreateObject, &result));
}
DCHECK(result); // We synchronized on thread destruction above.
return result;
}
private:
static void CreateObject(T** result) {
*result = new T;
}
};
struct Base {};
struct Derived : Base {};
struct Producer : SupportsWeakPtr<Producer> {};
struct Consumer { WeakPtr<Producer> producer; };
} // namespace
TEST(WeakPtrTest, Basic) {
int data;
WeakPtrFactory<int> factory(&data);
WeakPtr<int> ptr = factory.GetWeakPtr();
EXPECT_EQ(&data, ptr.get());
}
TEST(WeakPtrTest, Comparison) {
int data;
WeakPtrFactory<int> factory(&data);
WeakPtr<int> ptr = factory.GetWeakPtr();
WeakPtr<int> ptr2 = ptr;
EXPECT_TRUE(ptr == ptr2);
}
TEST(WeakPtrTest, OutOfScope) {
WeakPtr<int> ptr;
EXPECT_TRUE(ptr.get() == NULL);
{
int data;
WeakPtrFactory<int> factory(&data);
ptr = factory.GetWeakPtr();
}
EXPECT_TRUE(ptr.get() == NULL);
}
TEST(WeakPtrTest, Multiple) {
WeakPtr<int> a, b;
{
int data;
WeakPtrFactory<int> factory(&data);
a = factory.GetWeakPtr();
b = factory.GetWeakPtr();
EXPECT_EQ(&data, a.get());
EXPECT_EQ(&data, b.get());
}
EXPECT_TRUE(a.get() == NULL);
EXPECT_TRUE(b.get() == NULL);
}
TEST(WeakPtrTest, UpCast) {
Derived data;
WeakPtrFactory<Derived> factory(&data);
WeakPtr<Base> ptr = factory.GetWeakPtr();
ptr = factory.GetWeakPtr();
EXPECT_EQ(ptr.get(), &data);
}
TEST(WeakPtrTest, SupportsWeakPtr) {
Producer f;
WeakPtr<Producer> ptr = f.AsWeakPtr();
EXPECT_EQ(&f, ptr.get());
}
TEST(WeakPtrTest, InvalidateWeakPtrs) {
int data;
WeakPtrFactory<int> factory(&data);
WeakPtr<int> ptr = factory.GetWeakPtr();
EXPECT_EQ(&data, ptr.get());
EXPECT_TRUE(factory.HasWeakPtrs());
factory.InvalidateWeakPtrs();
EXPECT_TRUE(ptr.get() == NULL);
EXPECT_FALSE(factory.HasWeakPtrs());
}
TEST(WeakPtrTest, HasWeakPtrs) {
int data;
WeakPtrFactory<int> factory(&data);
{
WeakPtr<int> ptr = factory.GetWeakPtr();
EXPECT_TRUE(factory.HasWeakPtrs());
}
EXPECT_FALSE(factory.HasWeakPtrs());
}
TEST(WeakPtrTest, SingleThreaded1) {
// Test that it is OK to create a class that supports weak references on one
// thread, but use it on another. This tests that we do not trip runtime
// checks that ensure that a weak reference is not used by multiple threads.
scoped_ptr<Producer> producer(OffThreadObjectCreator<Producer>::NewObject());
WeakPtr<Producer> weak_producer = producer->AsWeakPtr();
EXPECT_EQ(producer.get(), weak_producer.get());
}
TEST(WeakPtrTest, SingleThreaded2) {
// Test that it is OK to create a class that has a WeakPtr member on one
// thread, but use it on another. This tests that we do not trip runtime
// checks that ensure that a weak reference is not used by multiple threads.
scoped_ptr<Consumer> consumer(OffThreadObjectCreator<Consumer>::NewObject());
Producer producer;
consumer->producer = producer.AsWeakPtr();
EXPECT_EQ(&producer, consumer->producer.get());
}
} // namespace base
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