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// Copyright 2013 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.
#ifndef CONTENT_CHILD_INDEXED_DB_PROXY_WEBIDBCURSOR_IMPL_H_
#define CONTENT_CHILD_INDEXED_DB_PROXY_WEBIDBCURSOR_IMPL_H_
#include <deque>
#include <vector>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/memory/ref_counted.h"
#include "content/common/content_export.h"
#include "content/common/indexed_db/indexed_db_key.h"
#include "third_party/WebKit/public/platform/WebData.h"
#include "third_party/WebKit/public/platform/WebIDBCallbacks.h"
#include "third_party/WebKit/public/platform/WebIDBCursor.h"
#include "third_party/WebKit/public/platform/WebIDBKey.h"
namespace content {
class ThreadSafeSender;
class CONTENT_EXPORT WebIDBCursorImpl
: NON_EXPORTED_BASE(public blink::WebIDBCursor) {
public:
WebIDBCursorImpl(int32 ipc_cursor_id, ThreadSafeSender* thread_safe_sender);
virtual ~WebIDBCursorImpl();
virtual void advance(unsigned long count, blink::WebIDBCallbacks* callback);
virtual void continueFunction(const blink::WebIDBKey& key,
blink::WebIDBCallbacks* callback);
virtual void continueFunction(const blink::WebIDBKey& key,
const blink::WebIDBKey& primary_key,
blink::WebIDBCallbacks* callback);
virtual void postSuccessHandlerCallback();
void SetPrefetchData(const std::vector<IndexedDBKey>& keys,
const std::vector<IndexedDBKey>& primary_keys,
const std::vector<blink::WebData>& values);
void CachedContinue(blink::WebIDBCallbacks* callbacks);
void ResetPrefetchCache();
private:
FRIEND_TEST_ALL_PREFIXES(WebIDBCursorImplTest, PrefetchTest);
int32 ipc_cursor_id_;
// Prefetch cache.
std::deque<IndexedDBKey> prefetch_keys_;
std::deque<IndexedDBKey> prefetch_primary_keys_;
std::deque<blink::WebData> prefetch_values_;
// Number of continue calls that would qualify for a pre-fetch.
int continue_count_;
// Number of items used from the last prefetch.
int used_prefetches_;
// Number of onsuccess handlers we are waiting for.
int pending_onsuccess_callbacks_;
// Number of items to request in next prefetch.
int prefetch_amount_;
scoped_refptr<ThreadSafeSender> thread_safe_sender_;
enum { kInvalidCursorId = -1 };
enum { kPrefetchContinueThreshold = 2 };
enum { kMinPrefetchAmount = 5 };
enum { kMaxPrefetchAmount = 100 };
};
} // namespace content
#endif // CONTENT_CHILD_INDEXED_DB_PROXY_WEBIDBCURSOR_IMPL_H_
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