storage/mozStorageAsyncStatementJSHelper.h
author Edgar Chen <echen@mozilla.com>
Tue, 17 Sep 2019 01:12:07 +0000
changeset 493515 9596d7f4a7457bccc78cadf9c39bcc9c4b5b97f8
parent 472056 e1993a1f09ac53cd1a04fdf6a87f8cad8e44f73e
permissions -rw-r--r--
Bug 1579858 - Should release RefPtr before CollectData is clear; r=smaug mAboutToBeNotifiedRejectedPromises will be clear in AfterProcessMicrotasks() and mPendingUnhandledRejections will be clear after NotifyUnhandledRejections runnable is handled. However, worker could terminate in any time, we still need to clear those structures manually before CollectData is clear. Differential Revision: https://phabricator.services.mozilla.com/D46095

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_storage_mozStorageAsyncStatementJSHelper_h_
#define mozilla_storage_mozStorageAsyncStatementJSHelper_h_

#include "nsIXPCScriptable.h"
#include "nsIXPConnect.h"

namespace mozilla {
namespace storage {

class AsyncStatement;
class AsyncStatementParams;

/**
 * A modified version of StatementJSHelper that only exposes the async-specific
 * 'params' helper.  We do not expose 'row' or 'step' as they do not apply to
 * us.
 */
class AsyncStatementJSHelper : public nsIXPCScriptable {
 public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIXPCSCRIPTABLE

 private:
  nsresult getParams(AsyncStatement*, JSContext*, JSObject*, JS::Value*);
};

/**
 * Wrapper used to clean up the references JS helpers hold to the statement.
 * For cycle-avoidance reasons they do not hold reference-counted references,
 * so it is important we do this.
 */
class AsyncStatementParamsHolder final : public nsISupports {
 public:
  NS_DECL_ISUPPORTS

  explicit AsyncStatementParamsHolder(AsyncStatementParams* aParams)
      : mParams(aParams) {}

  AsyncStatementParams* Get() const {
    MOZ_ASSERT(mParams);
    return mParams;
  }

 private:
  virtual ~AsyncStatementParamsHolder();

  RefPtr<AsyncStatementParams> mParams;
};

}  // namespace storage
}  // namespace mozilla

#endif  // mozilla_storage_mozStorageAsyncStatementJSHelper_h_