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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/Ref.h>
#include <wtf/RefCounter.h>
#include <wtf/text/WTFString.h>
namespace TestWebKitAPI {
static const int CallbackExpected = 0xC0FFEE;
static const int CallbackNotExpected = 0xDECAF;
enum CounterType { };
typedef RefCounter::Token<CounterType> TokenType;
TEST(WTF, RefCounter)
{
// RefCounter API is pretty simple, containing the following 4 methods to test:
//
// 1) RefCounter(std::function<void()>);
// 2) ~RefCounter();
// 3) Ref<Count> token() const;
// 4) unsigned value() const;
//
// We'll test:
// 1) Construction:
// 1a) with a callback
// 1b) without a callback
// 2) Destruction where the RefCounter::Count has:
// 2a) a non-zero reference count (Count outlives RefCounter).
// 2b) a zero reference count (Count is deleted by RefCounter's destructor).
// 3) Call count to ref/deref the Count object, where:
// 3a) ref with callback from 0 -> 1.
// 3b) ref with callback from 1 -> >1.
// 3c) deref with callback from >1 -> 1.
// 3d) deref with callback from 1 -> 0.
// 3d) deref with callback from 1 -> 0.
// 3e) ref with callback from 1 -> >1 AFTER RefCounter has been destroyed.
// 3f) deref with callback from >1 -> 1 AFTER RefCounter has been destroyed.
// 3g) deref with callback from 1 -> 0 AFTER RefCounter has been destroyed.
// 3h) ref without callback
// 3i) deref without callback
// 3j) ref using a Ref rather than a RefPtr (make sure there is no unnecessary reference count churn).
// 3k) deref using a Ref rather than a RefPtr (make sure there is no unnecessary reference count churn).
// 4) Test the value of the counter:
// 4a) at construction.
// 4b) as read within the callback.
// 4c) as read after the ref/deref.
// These values will outlive the following block.
int callbackValue = CallbackNotExpected;
TokenType incTo1Again;
{
// Testing (1a) - Construction with a callback.
RefCounter* counterPtr = nullptr;
RefCounter counter([&](bool value) {
// Check that the callback is called at the expected times, and the correct number of times.
EXPECT_EQ(callbackValue, CallbackExpected);
// Value provided should be equal to the counter value.
EXPECT_EQ(value, counterPtr->value());
// return the value of the counter in the callback.
callbackValue = value;
});
counterPtr = &counter;
// Testing (4a) - after construction value() is 0.
EXPECT_EQ(0, static_cast<int>(counter.value()));
// Testing (3a) - ref with callback from 0 -> 1.
callbackValue = CallbackExpected;
TokenType incTo1(counter.token<CounterType>());
// Testing (4b) & (4c) - values within & after callback.
EXPECT_EQ(true, callbackValue);
EXPECT_EQ(1, static_cast<int>(counter.value()));
// Testing (3b) - ref with callback from 1 -> 2.
TokenType incTo2(incTo1);
// Testing (4b) & (4c) - values within & after callback.
EXPECT_EQ(2, static_cast<int>(counter.value()));
// Testing (3c) - deref with callback from >1 -> 1.
incTo1 = nullptr;
// Testing (4b) & (4c) - values within & after callback.
EXPECT_EQ(1, static_cast<int>(counter.value()));
{
// Testing (3j) - ref using a Ref rather than a RefPtr.
TokenType incTo2Again(counter.token<CounterType>());
// Testing (4b) & (4c) - values within & after callback.
EXPECT_EQ(2, static_cast<int>(counter.value()));
// Testing (3k) - deref using a Ref rather than a RefPtr.
}
EXPECT_EQ(1, static_cast<int>(counter.value()));
// Testing (4b) & (4c) - values within & after callback.
// Testing (3d) - deref with callback from 1 -> 0.
callbackValue = CallbackExpected;
incTo2 = nullptr;
// Testing (4b) & (4c) - values within & after callback.
EXPECT_EQ(0, callbackValue);
EXPECT_EQ(0, static_cast<int>(counter.value()));
// Testing (2a) - Destruction where the RefCounter::Count has a non-zero reference count.
callbackValue = CallbackExpected;
incTo1Again = counter.token<CounterType>();
EXPECT_EQ(1, callbackValue);
EXPECT_EQ(1, static_cast<int>(counter.value()));
callbackValue = CallbackNotExpected;
}
// Testing (3e) - ref with callback from 1 -> >1 AFTER RefCounter has been destroyed.
TokenType incTo2Again = incTo1Again;
// Testing (3f) - deref with callback from >1 -> 1 AFTER RefCounter has been destroyed.
incTo1Again = nullptr;
// Testing (3g) - deref with callback from 1 -> 0 AFTER RefCounter has been destroyed.
incTo2Again = nullptr;
// Testing (1b) - Construction without a callback.
RefCounter counter;
// Testing (4a) - after construction value() is 0.
EXPECT_EQ(0, static_cast<int>(counter.value()));
// Testing (3h) - ref without callback
TokenType incTo1(counter.token<CounterType>());
// Testing (4c) - value as read after the ref.
EXPECT_EQ(1, static_cast<int>(counter.value()));
// Testing (3i) - deref without callback
incTo1 = nullptr;
// Testing (4c) - value as read after the deref.
EXPECT_EQ(0, static_cast<int>(counter.value()));
// Testing (2b) - Destruction where the RefCounter::Count has a zero reference count.
// ... not a lot to test here! - we can at least ensure this code path is run & we don't crash!
}
} // namespace TestWebKitAPI
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