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* Copyright (C) 2019 Apple Inc. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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#include "WebBackForwardCacheEntry.h"
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#include "SuspendedPageProxy.h"
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#include "WebBackForwardCache.h"
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#include "WebProcessMessages.h"
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#include "WebProcessProxy.h"
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static const Seconds expirationDelay { 30_min };
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WebBackForwardCacheEntry::WebBackForwardCacheEntry(WebBackForwardCache& backForwardCache, WebCore::BackForwardItemIdentifier backForwardItemID, WebCore::ProcessIdentifier processIdentifier, std::unique_ptr<SuspendedPageProxy>&& suspendedPage)
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: m_backForwardCache(backForwardCache)
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, m_processIdentifier(processIdentifier)
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, m_backForwardItemID(backForwardItemID)
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, m_suspendedPage(WTFMove(suspendedPage))
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, m_expirationTimer(RunLoop::main(), this, &WebBackForwardCacheEntry::expirationTimerFired)
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m_expirationTimer.startOneShot(expirationDelay);
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WebBackForwardCacheEntry::~WebBackForwardCacheEntry()
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if (m_backForwardItemID && !m_suspendedPage) {
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auto& process = this->process();
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process.sendWithAsyncReply(Messages::WebProcess::ClearCachedPage(m_backForwardItemID), [activity = process.throttler().backgroundActivity("Clearing back/forward cache entry"_s)] { });
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std::unique_ptr<SuspendedPageProxy> WebBackForwardCacheEntry::takeSuspendedPage()
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ASSERT(m_suspendedPage);
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m_backForwardItemID = { };
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m_expirationTimer.stop();
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return std::exchange(m_suspendedPage, nullptr);
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WebProcessProxy& WebBackForwardCacheEntry::process() const
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auto* process = WebProcessProxy::processForIdentifier(m_processIdentifier);
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ASSERT(!m_suspendedPage || process == &m_suspendedPage->process());
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void WebBackForwardCacheEntry::expirationTimerFired()
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RELEASE_LOG(BackForwardCache, "%p - WebBackForwardCacheEntry::expirationTimerFired backForwardItemID: %s, hasSuspendedPage? %d", this, m_backForwardItemID.string().utf8().data(), !!m_suspendedPage);
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ASSERT(m_backForwardItemID);
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auto* item = WebBackForwardListItem::itemForID(m_backForwardItemID);
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m_backForwardCache.removeEntry(*item); // Will destroy |this|.