Back to index

lightning-sunbird  0.9+nobinonly
nsStreamObserverProxy.h
Go to the documentation of this file.
00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #ifndef nsStreamObserverProxy_h__
00039 #define nsStreamObserverProxy_h__
00040 
00041 #include "nsIStreamObserver.h"
00042 #include "nsIEventQueue.h"
00043 #include "nsIChannel.h"
00044 #include "nsCOMPtr.h"
00045 #include "prlog.h"
00046 
00047 #if defined(PR_LOGGING)
00048 extern PRLogModuleInfo *gStreamProxyLog;
00049 #endif
00050 
00051 class nsStreamProxyBase : public nsIStreamObserver
00052 {
00053 public:
00054     NS_DECL_ISUPPORTS
00055     NS_DECL_NSISTREAMOBSERVER
00056 
00057     nsStreamProxyBase() { }
00058     virtual ~nsStreamProxyBase() {}
00059 
00060     nsIEventQueue *GetEventQueue() { return mEventQ.get(); }
00061     nsIStreamObserver *GetReceiver() { return mReceiver.get(); }
00062 
00063     nsresult SetEventQueue(nsIEventQueue *);
00064 
00065     nsresult SetReceiver(nsIStreamObserver *aReceiver) {
00066         PRBool same = ::SameCOMIdentity(aReceiver, this);
00067         NS_ASSERTION((!same), "aReceiver is self"); 
00068         mReceiver = aReceiver;
00069         return NS_OK;
00070     }
00071 
00072 private:
00073     nsCOMPtr<nsIEventQueue>     mEventQ;
00074     nsCOMPtr<nsIStreamObserver> mReceiver;
00075 };
00076 
00077 class nsStreamObserverProxy : public nsStreamProxyBase
00078                             , public nsIStreamObserverProxy
00079 {
00080 public:
00081     NS_DECL_ISUPPORTS_INHERITED
00082     NS_FORWARD_NSISTREAMOBSERVER(nsStreamProxyBase::)
00083     NS_DECL_NSISTREAMOBSERVERPROXY
00084 };
00085 
00086 class nsStreamObserverEvent
00087 {
00088 public:
00089     nsStreamObserverEvent(nsStreamProxyBase *proxy,
00090                           nsIRequest *request, nsISupports *context);
00091     virtual ~nsStreamObserverEvent();
00092 
00093     nsresult FireEvent(nsIEventQueue *);
00094     NS_IMETHOD HandleEvent() = 0;
00095 
00096 protected:
00097     static void PR_CALLBACK HandlePLEvent(PLEvent *);
00098     static void PR_CALLBACK DestroyPLEvent(PLEvent *);
00099 
00100     PLEvent                mEvent;
00101     nsStreamProxyBase     *mProxy;
00102     nsCOMPtr<nsIRequest>   mRequest;
00103     nsCOMPtr<nsISupports>  mContext;
00104 };
00105 
00106 #define GET_STREAM_OBSERVER_EVENT(_mEvent_ptr) \
00107     ((nsStreamObserverEvent *) \
00108      ((char *)(_mEvent_ptr) - offsetof(nsStreamObserverEvent, mEvent)))
00109 
00110 #endif /* !nsStreamObserverProxy_h__ */