gecko-dev/dom/presentation/ControllerConnectionCollection.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#include "ControllerConnectionCollection.h"

#include "mozilla/ClearOnShutdown.h"
#include "nsIPresentationService.h"
#include "PresentationConnection.h"

namespace mozilla {
namespace dom {

/* static */
StaticAutoPtr<ControllerConnectionCollection>
    ControllerConnectionCollection::sSingleton;

/* static */
ControllerConnectionCollection* ControllerConnectionCollection::GetSingleton() {
  MOZ_ASSERT(NS_IsMainThread());

  if (!sSingleton) {
    sSingleton = new ControllerConnectionCollection();
    ClearOnShutdown(&sSingleton);
  }

  return sSingleton;
}

ControllerConnectionCollection::ControllerConnectionCollection() {
  MOZ_COUNT_CTOR(ControllerConnectionCollection);
}

ControllerConnectionCollection::~ControllerConnectionCollection() {
  MOZ_COUNT_DTOR(ControllerConnectionCollection);
}

void ControllerConnectionCollection::AddConnection(
    PresentationConnection* aConnection, const uint8_t aRole) {
  MOZ_ASSERT(NS_IsMainThread());
  if (aRole != nsIPresentationService::ROLE_CONTROLLER) {
    MOZ_ASSERT(false, "This is allowed only to be called at controller side.");
    return;
  }

  if (!aConnection) {
    return;
  }

  WeakPtr<PresentationConnection> connection = aConnection;
  if (mConnections.Contains(connection)) {
    return;
  }

  mConnections.AppendElement(connection);
}

void ControllerConnectionCollection::RemoveConnection(
    PresentationConnection* aConnection, const uint8_t aRole) {
  MOZ_ASSERT(NS_IsMainThread());
  if (aRole != nsIPresentationService::ROLE_CONTROLLER) {
    MOZ_ASSERT(false, "This is allowed only to be called at controller side.");
    return;
  }

  if (!aConnection) {
    return;
  }

  WeakPtr<PresentationConnection> connection = aConnection;
  mConnections.RemoveElement(connection);
}

already_AddRefed<PresentationConnection>
ControllerConnectionCollection::FindConnection(uint64_t aWindowId,
                                               const nsAString& aId,
                                               const uint8_t aRole) {
  MOZ_ASSERT(NS_IsMainThread());
  if (aRole != nsIPresentationService::ROLE_CONTROLLER) {
    MOZ_ASSERT(false, "This is allowed only to be called at controller side.");
    return nullptr;
  }

  // Loop backwards to allow removing elements in the loop.
  for (int i = mConnections.Length() - 1; i >= 0; --i) {
    WeakPtr<PresentationConnection> connection = mConnections[i];
    if (!connection) {
      // The connection was destroyed. Remove it from the list.
      mConnections.RemoveElementAt(i);
      continue;
    }

    if (connection->Equals(aWindowId, aId)) {
      RefPtr<PresentationConnection> matchedConnection = connection.get();
      return matchedConnection.forget();
    }
  }

  return nullptr;
}

}  // namespace dom
}  // namespace mozilla