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- // Copyright (c) 2011 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 "butil/cancelable_callback.h"
- #include "butil/bind.h"
- #include "butil/bind_helpers.h"
- #include "butil/memory/ref_counted.h"
- #include <gtest/gtest.h>
- namespace butil {
- namespace {
- class TestRefCounted : public RefCountedThreadSafe<TestRefCounted> {
- private:
- friend class RefCountedThreadSafe<TestRefCounted>;
- ~TestRefCounted() {};
- };
- void Increment(int* count) { (*count)++; }
- void IncrementBy(int* count, int n) { (*count) += n; }
- void RefCountedParam(const scoped_refptr<TestRefCounted>& ref_counted) {}
- // Cancel().
- // - Callback can be run multiple times.
- // - After Cancel(), Run() completes but has no effect.
- TEST(CancelableCallbackTest, Cancel) {
- int count = 0;
- CancelableClosure cancelable(
- butil::Bind(&Increment, butil::Unretained(&count)));
- butil::Closure callback = cancelable.callback();
- callback.Run();
- EXPECT_EQ(1, count);
- callback.Run();
- EXPECT_EQ(2, count);
- cancelable.Cancel();
- callback.Run();
- EXPECT_EQ(2, count);
- }
- // Cancel() called multiple times.
- // - Cancel() cancels all copies of the wrapped callback.
- // - Calling Cancel() more than once has no effect.
- // - After Cancel(), callback() returns a null callback.
- TEST(CancelableCallbackTest, MultipleCancel) {
- int count = 0;
- CancelableClosure cancelable(
- butil::Bind(&Increment, butil::Unretained(&count)));
- butil::Closure callback1 = cancelable.callback();
- butil::Closure callback2 = cancelable.callback();
- cancelable.Cancel();
- callback1.Run();
- EXPECT_EQ(0, count);
- callback2.Run();
- EXPECT_EQ(0, count);
- // Calling Cancel() again has no effect.
- cancelable.Cancel();
- // callback() of a cancelled callback is null.
- butil::Closure callback3 = cancelable.callback();
- EXPECT_TRUE(callback3.is_null());
- }
- // CancelableCallback destroyed before callback is run.
- // - Destruction of CancelableCallback cancels outstanding callbacks.
- TEST(CancelableCallbackTest, CallbackCanceledOnDestruction) {
- int count = 0;
- butil::Closure callback;
- {
- CancelableClosure cancelable(
- butil::Bind(&Increment, butil::Unretained(&count)));
- callback = cancelable.callback();
- callback.Run();
- EXPECT_EQ(1, count);
- }
- callback.Run();
- EXPECT_EQ(1, count);
- }
- // Cancel() called on bound closure with a RefCounted parameter.
- // - Cancel drops wrapped callback (and, implicitly, its bound arguments).
- TEST(CancelableCallbackTest, CancelDropsCallback) {
- scoped_refptr<TestRefCounted> ref_counted = new TestRefCounted;
- EXPECT_TRUE(ref_counted->HasOneRef());
- CancelableClosure cancelable(butil::Bind(RefCountedParam, ref_counted));
- EXPECT_FALSE(cancelable.IsCancelled());
- EXPECT_TRUE(ref_counted.get());
- EXPECT_FALSE(ref_counted->HasOneRef());
- // There is only one reference to |ref_counted| after the Cancel().
- cancelable.Cancel();
- EXPECT_TRUE(cancelable.IsCancelled());
- EXPECT_TRUE(ref_counted.get());
- EXPECT_TRUE(ref_counted->HasOneRef());
- }
- // Reset().
- // - Reset() replaces the existing wrapped callback with a new callback.
- // - Reset() deactivates outstanding callbacks.
- TEST(CancelableCallbackTest, Reset) {
- int count = 0;
- CancelableClosure cancelable(
- butil::Bind(&Increment, butil::Unretained(&count)));
- butil::Closure callback = cancelable.callback();
- callback.Run();
- EXPECT_EQ(1, count);
- callback.Run();
- EXPECT_EQ(2, count);
- cancelable.Reset(
- butil::Bind(&IncrementBy, butil::Unretained(&count), 3));
- EXPECT_FALSE(cancelable.IsCancelled());
- // The stale copy of the cancelable callback is non-null.
- ASSERT_FALSE(callback.is_null());
- // The stale copy of the cancelable callback is no longer active.
- callback.Run();
- EXPECT_EQ(2, count);
- butil::Closure callback2 = cancelable.callback();
- ASSERT_FALSE(callback2.is_null());
- callback2.Run();
- EXPECT_EQ(5, count);
- }
- // IsCanceled().
- // - Cancel() transforms the CancelableCallback into a cancelled state.
- TEST(CancelableCallbackTest, IsNull) {
- CancelableClosure cancelable;
- EXPECT_TRUE(cancelable.IsCancelled());
- int count = 0;
- cancelable.Reset(butil::Bind(&Increment,
- butil::Unretained(&count)));
- EXPECT_FALSE(cancelable.IsCancelled());
- cancelable.Cancel();
- EXPECT_TRUE(cancelable.IsCancelled());
- }
- } // namespace
- } // namespace butil
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