callback_unittest.cc 4.73 KB
Newer Older
gejun's avatar
gejun committed
1 2 3 4
// 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.

5 6 7 8 9 10
#include "butil/bind.h"
#include "butil/callback.h"
#include "butil/callback_helpers.h"
#include "butil/callback_internal.h"
#include "butil/memory/ref_counted.h"
#include "butil/memory/scoped_ptr.h"
gejun's avatar
gejun committed
11 12
#include <gtest/gtest.h>

13
namespace butil {
gejun's avatar
gejun committed
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

namespace {

struct FakeInvoker {
  typedef void(RunType)(internal::BindStateBase*);
  static void Run(internal::BindStateBase*) {
  }
};

}  // namespace

namespace internal {
template <typename Runnable, typename RunType, typename BoundArgsType>
struct BindState;

// White-box testpoints to inject into a Callback<> object for checking
// comparators and emptiness APIs.  Use a BindState that is specialized
// based on a type we declared in the anonymous namespace above to remove any
// chance of colliding with another instantiation and breaking the
// one-definition-rule.
template <>
struct BindState<void(void), void(void), void(FakeInvoker)>
    : public BindStateBase {
 public:
  typedef FakeInvoker InvokerType;
};

template <>
struct BindState<void(void), void(void),
                           void(FakeInvoker, FakeInvoker)>
    : public BindStateBase {
 public:
  typedef FakeInvoker InvokerType;
};
}  // namespace internal

namespace {

typedef internal::BindState<void(void), void(void), void(FakeInvoker)>
    FakeBindState1;
typedef internal::BindState<void(void), void(void),
                            void(FakeInvoker, FakeInvoker)>
   FakeBindState2;

class CallbackTest : public ::testing::Test {
 public:
  CallbackTest()
      : callback_a_(new FakeBindState1()),
        callback_b_(new FakeBindState2()) {
  }

  virtual ~CallbackTest() {
  }

 protected:
  Callback<void(void)> callback_a_;
  const Callback<void(void)> callback_b_;  // Ensure APIs work with const.
  Callback<void(void)> null_callback_;
};

// Ensure we can create unbound callbacks. We need this to be able to store
// them in class members that can be initialized later.
TEST_F(CallbackTest, DefaultConstruction) {
  Callback<void(void)> c0;
  Callback<void(int)> c1;
  Callback<void(int,int)> c2;
  Callback<void(int,int,int)> c3;
  Callback<void(int,int,int,int)> c4;
  Callback<void(int,int,int,int,int)> c5;
  Callback<void(int,int,int,int,int,int)> c6;

  EXPECT_TRUE(c0.is_null());
  EXPECT_TRUE(c1.is_null());
  EXPECT_TRUE(c2.is_null());
  EXPECT_TRUE(c3.is_null());
  EXPECT_TRUE(c4.is_null());
  EXPECT_TRUE(c5.is_null());
  EXPECT_TRUE(c6.is_null());
}

TEST_F(CallbackTest, IsNull) {
  EXPECT_TRUE(null_callback_.is_null());
  EXPECT_FALSE(callback_a_.is_null());
  EXPECT_FALSE(callback_b_.is_null());
}

TEST_F(CallbackTest, Equals) {
  EXPECT_TRUE(callback_a_.Equals(callback_a_));
  EXPECT_FALSE(callback_a_.Equals(callback_b_));
  EXPECT_FALSE(callback_b_.Equals(callback_a_));

  // We should compare based on instance, not type.
  Callback<void(void)> callback_c(new FakeBindState1());
  Callback<void(void)> callback_a2 = callback_a_;
  EXPECT_TRUE(callback_a_.Equals(callback_a2));
  EXPECT_FALSE(callback_a_.Equals(callback_c));

  // Empty, however, is always equal to empty.
  Callback<void(void)> empty2;
  EXPECT_TRUE(null_callback_.Equals(empty2));
}

TEST_F(CallbackTest, Reset) {
  // Resetting should bring us back to empty.
  ASSERT_FALSE(callback_a_.is_null());
  ASSERT_FALSE(callback_a_.Equals(null_callback_));

  callback_a_.Reset();

  EXPECT_TRUE(callback_a_.is_null());
  EXPECT_TRUE(callback_a_.Equals(null_callback_));
}

struct TestForReentrancy {
  TestForReentrancy()
      : cb_already_run(false),
        cb(Bind(&TestForReentrancy::AssertCBIsNull, Unretained(this))) {
  }
  void AssertCBIsNull() {
    ASSERT_TRUE(cb.is_null());
    cb_already_run = true;
  }
  bool cb_already_run;
  Closure cb;
};

TEST_F(CallbackTest, ResetAndReturn) {
  TestForReentrancy tfr;
  ASSERT_FALSE(tfr.cb.is_null());
  ASSERT_FALSE(tfr.cb_already_run);
  ResetAndReturn(&tfr.cb).Run();
  ASSERT_TRUE(tfr.cb.is_null());
  ASSERT_TRUE(tfr.cb_already_run);
}

149
class CallbackOwner : public butil::RefCounted<CallbackOwner> {
gejun's avatar
gejun committed
150 151 152 153 154 155 156 157 158 159 160
 public:
  explicit CallbackOwner(bool* deleted) {
    callback_ = Bind(&CallbackOwner::Unused, this);
    deleted_ = deleted;
  }
  void Reset() {
    callback_.Reset();
    // We are deleted here if no-one else had a ref to us.
  }

 private:
161
  friend class butil::RefCounted<CallbackOwner>;
gejun's avatar
gejun committed
162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
  virtual ~CallbackOwner() {
    *deleted_ = true;
  }
  void Unused() {
    FAIL() << "Should never be called";
  }

  Closure callback_;
  bool* deleted_;
};

TEST_F(CallbackTest, CallbackHasLastRefOnContainingObject) {
  bool deleted = false;
  CallbackOwner* owner = new CallbackOwner(&deleted);
  owner->Reset();
  ASSERT_TRUE(deleted);
}

}  // namespace
181
}  // namespace butil