1 files changed, 103 insertions, 0 deletions
diff --git a/Source/WebCore/replay/ReplayingInputCursor.cpp b/Source/WebCore/replay/ReplayingInputCursor.cpp
new file mode 100644
index 000000000..0e26a2a4b
--- /dev/null
+++ b/Source/WebCore/replay/ReplayingInputCursor.cpp
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2013 University of Washington. All rights reserved.
+ * Copyright (C) 2014 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * HOLDER OR 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 "ReplayingInputCursor.h"
+
+#if ENABLE(WEB_REPLAY)
+
+#include "EventLoopInputDispatcher.h"
+#include "ReplaySessionSegment.h"
+#include "SegmentedInputStorage.h"
+#include "SerializationMethods.h"
+#include "WebReplayInputs.h"
+#include <wtf/text/CString.h>
+
+namespace WebCore {
+
+ReplayingInputCursor::ReplayingInputCursor(RefPtr<ReplaySessionSegment>&& segment, Page& page, EventLoopInputDispatcherClient* client)
+    : m_segment(WTFMove(segment))
+    , m_dispatcher(std::make_unique<EventLoopInputDispatcher>(page, *this, client))
+{
+    for (size_t i = 0; i < static_cast<size_t>(InputQueue::Count); i++)
+        m_positions.append(0);
+}
+
+ReplayingInputCursor::~ReplayingInputCursor()
+{
+}
+
+Ref<ReplayingInputCursor> ReplayingInputCursor::create(RefPtr<ReplaySessionSegment>&& segment, Page& page, EventLoopInputDispatcherClient* client)
+{
+    return adoptRef(*new ReplayingInputCursor(WTFMove(segment), page, client));
+}
+
+void ReplayingInputCursor::storeInput(std::unique_ptr<NondeterministicInputBase>)
+{
+    // Cannot store inputs from a replaying input cursor.
+    ASSERT_NOT_REACHED();
+}
+
+NondeterministicInputBase* ReplayingInputCursor::loadInput(InputQueue queue, const String& type)
+{
+    NondeterministicInputBase* input = uncheckedLoadInput(queue);
+
+    if (input->type() != type) {
+        LOG_ERROR("%-25s ERROR: Expected replay input of type %s, but got type %s\n", "[ReplayingInputCursor]", type.ascii().data(), input->type().ascii().data());
+        return nullptr;
+    }
+
+    return input;
+}
+
+NondeterministicInputBase* ReplayingInputCursor::uncheckedLoadInput(InputQueue queue)
+{
+    if (m_positions[static_cast<size_t>(queue)] >= m_segment->storage().queueSize(queue)) {
+        String queueString = EncodingTraits<InputQueue>::encodeValue(queue).convertTo<String>();
+        LOG_ERROR("%-30s ERROR No more inputs remain for determinism queue %s, but one was requested.", "[ReplayingInputCursor]", queueString.ascii().data());
+        return nullptr;
+    }
+
+    return m_segment->storage().load(queue, m_positions[static_cast<size_t>(queue)]++);
+}
+
+EventLoopInputData ReplayingInputCursor::loadEventLoopInput()
+{
+    ASSERT(m_segment);
+
+    size_t offset = m_positions.at(static_cast<size_t>(InputQueue::EventLoopInput));
+    ASSERT(offset < m_segment->eventLoopTimings().size());
+
+    EventLoopInputData data;
+    data.timestamp = m_segment->eventLoopTimings().at(offset);
+    data.input = static_cast<EventLoopInputBase*>(uncheckedLoadInput(InputQueue::EventLoopInput));
+    return data;
+}
+
+}; // namespace WebCore
+
+#endif // ENABLE(WEB_REPLAY)