/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2013 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:
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
 * distribution.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_SQL_TRANSACTION_COORDINATOR_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_SQL_TRANSACTION_COORDINATOR_H_

#include "base/macros.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
#include "third_party/blink/renderer/platform/wtf/deque.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"

namespace blink {

class SQLTransactionBackend;

class SQLTransactionCoordinator final
    : public GarbageCollected<SQLTransactionCoordinator> {
 public:
  SQLTransactionCoordinator();
  void Trace(Visitor*) const;
  void AcquireLock(SQLTransactionBackend*);
  void ReleaseLock(SQLTransactionBackend*);
  void Shutdown();

 private:
  typedef Deque<CrossThreadPersistent<SQLTransactionBackend>> TransactionsQueue;
  struct CoordinationInfo {
    DISALLOW_NEW();

   public:
    TransactionsQueue pending_transactions;
    HashSet<CrossThreadPersistent<SQLTransactionBackend>>
        active_read_transactions;
    CrossThreadPersistent<SQLTransactionBackend> active_write_transaction;
  };
  // Maps database names to information about pending transactions
  typedef HashMap<String, CoordinationInfo> CoordinationInfoHeapMap;
  CoordinationInfoHeapMap coordination_info_map_;
  bool is_shutting_down_;

  void ProcessPendingTransactions(CoordinationInfo&);

  DISALLOW_COPY_AND_ASSIGN(SQLTransactionCoordinator);
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_SQL_TRANSACTION_COORDINATOR_H_