1/* 2 * Copyright (C) 2011, 2012 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef ConnectionStack_h 27#define ConnectionStack_h 28 29#include <wtf/Vector.h> 30 31namespace IPC { 32 class Connection; 33} 34 35namespace WebKit { 36 37class ConnectionStack { 38public: 39 static ConnectionStack& shared(); 40 41 IPC::Connection* current() 42 { 43 return m_connectionStack.last(); 44 } 45 46 class CurrentConnectionPusher { 47 public: 48 CurrentConnectionPusher(ConnectionStack& connectionStack, IPC::Connection* connection) 49 : m_connectionStack(connectionStack) 50#if !ASSERT_DISABLED 51 , m_connection(connection) 52#endif 53 { 54 m_connectionStack.m_connectionStack.append(connection); 55 } 56 57 ~CurrentConnectionPusher() 58 { 59 ASSERT(m_connectionStack.current() == m_connection); 60 m_connectionStack.m_connectionStack.removeLast(); 61 } 62 63 private: 64 ConnectionStack& m_connectionStack; 65#if !ASSERT_DISABLED 66 IPC::Connection* m_connection; 67#endif 68 }; 69 70private: 71 // It's OK for these to be weak pointers because we only push object on the stack 72 // from within didReceiveMessage and didReceiveSyncMessage and the Connection objects are 73 // already ref'd for the duration of those functions. 74 Vector<IPC::Connection*, 4> m_connectionStack; 75}; 76 77} // namespace WebKit 78 79#endif // ConnectionStack_h 80