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169
mozilla/xpfe/bootstrap/nsDocLoadObserver.cpp
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169
mozilla/xpfe/bootstrap/nsDocLoadObserver.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Simon Fraser <sfraser@netscape.com>
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*/
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#include "nsCOMPtr.h"
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#include "nsError.h"
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#include "nsIObserverService.h"
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#include "nsIServiceManager.h"
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#include "nsString2.h"
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#include "nsAEUtils.h"
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#include "nsAESpyglassSuiteHandler.h"
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#include "nsDocLoadObserver.h"
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nsDocLoadObserver::nsDocLoadObserver()
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: mRegistered(PR_FALSE)
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{
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NS_INIT_ISUPPORTS();
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}
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nsDocLoadObserver::~nsDocLoadObserver()
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{
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}
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NS_IMPL_ISUPPORTS1(nsDocLoadObserver, nsIObserver)
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void nsDocLoadObserver::Register()
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{
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if (!mRegistered)
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{
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nsresult rv;
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nsCOMPtr<nsIObserverService> anObserverService = do_GetService(NS_OBSERVERSERVICE_PROGID, &rv);
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if (NS_SUCCEEDED(rv))
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{
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if (NS_SUCCEEDED(anObserverService->AddObserver(this,
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NS_ConvertASCIItoUCS2("EndDocumentLoad").GetUnicode())))
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{
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mRegistered = PR_TRUE;
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}
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}
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}
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}
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void nsDocLoadObserver::Unregister()
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{
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if (mRegistered)
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{
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nsresult rv;
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nsCOMPtr<nsIObserverService> anObserverService = do_GetService(NS_OBSERVERSERVICE_PROGID, &rv);
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if (NS_SUCCEEDED(rv))
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{
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if (NS_SUCCEEDED(anObserverService->RemoveObserver(this,
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NS_ConvertASCIItoUCS2("EndDocumentLoad").GetUnicode())))
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{
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mRegistered = PR_FALSE;
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}
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}
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}
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}
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void nsDocLoadObserver::AddEchoRequester(OSType appSignature)
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{
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mEchoRequesters.AppendElement((void*)appSignature);
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Register(); // ensure we are registered
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}
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void nsDocLoadObserver::RemoveEchoRequester(OSType appSignature)
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{
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mEchoRequesters.RemoveElement((void*)appSignature);
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if (mEchoRequesters.Count() == 0)
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Unregister();
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}
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NS_IMETHODIMP nsDocLoadObserver::Observe(nsISupports* /*aSubject*/,
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const PRUnichar* /*aTopic*/, const PRUnichar* someData)
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{
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// we need a URL to forward
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if (!someData)
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return NS_ERROR_NULL_POINTER;
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// are there any echo requesters to notify?
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if (mEchoRequesters.Count() == 0)
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return NS_OK;
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// create the descriptor for identifying this application
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StAEDesc from;
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const OSType mozz = 'MOZZ';
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if (noErr != ::AECreateDesc(typeType, &mozz, sizeof(mozz), &from))
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return NS_ERROR_UNEXPECTED;
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// create the descriptor for the URL
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nsString urlText(someData);
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char* urlString = urlText.ToNewCString();
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StAEDesc url;
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OSErr err = ::AECreateDesc(typeChar, urlString, urlText.Length(), &url);
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nsMemory::Free(urlString);
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if (err != noErr)
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return NS_ERROR_UNEXPECTED;
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// keep track of any invalid requesters and remove them when we're done
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nsVoidArray requestersToRemove;
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PRInt32 numRequesters = mEchoRequesters.Count();
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// now notify all the echo requesters
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for (PRInt32 i = 0; i < numRequesters; i ++)
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{
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// specify the address of the requester
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StAEDesc targetAddress;
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const OSType target = (OSType)mEchoRequesters.ElementAt(i);
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if (noErr != ::AECreateDesc(typeApplSignature, &target, sizeof(target), &targetAddress))
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return NS_ERROR_UNEXPECTED;
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// create the event
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AppleEvent sendEvent;
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err = ::AECreateAppleEvent(AESpyglassSuiteHandler::kSpyglassSendSignature,
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AESpyglassSuiteHandler::kSendURLEchoEvent,
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&targetAddress, kAutoGenerateReturnID, kAnyTransactionID, &sendEvent);
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if (noErr != err)
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{ // this target is no longer available
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requestersToRemove.AppendElement((void *)target);
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continue;
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}
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// attach our signature - to let the requester know who we are
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err = ::AEPutParamDesc(&sendEvent, keyOriginalAddressAttr, &from);
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NS_ASSERTION(noErr == err, "AEPutParamDesc");
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// attach the new URL
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err = ::AEPutParamDesc(&sendEvent, keyDirectObject, &url);
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NS_ASSERTION(noErr == err, "AEPutParamDesc");
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// send it
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AppleEvent reply;
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err = ::AESend(&sendEvent, &reply, kAENoReply, kAENormalPriority, 180, NULL, NULL);
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NS_ASSERTION(noErr == err, "AESend");
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::AEDisposeDesc(&sendEvent);
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}
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// now remove unresponsive requestors
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for (PRInt32 i = 0; i < requestersToRemove.Count(); i ++)
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{
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OSType thisRequester = (OSType)requestersToRemove.ElementAt(i);
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mEchoRequesters.RemoveElement((void *)thisRequester);
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}
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return NS_OK;
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}
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76
mozilla/xpfe/bootstrap/nsDocLoadObserver.h
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76
mozilla/xpfe/bootstrap/nsDocLoadObserver.h
Normal file
@ -0,0 +1,76 @@
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Simon Fraser <sfraser@netscape.com>
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*/
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#ifndef nsDocLoadObserver_h_
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#define nsDocLoadObserver_h_
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#include "nsIObserver.h"
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#include <MacTypes.h>
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#include "nsVoidArray.h"
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/*----------------------------------------------------------------------------
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nsDocLoadObserver
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The nsDocLoadObserver is a singleton object that registers for
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'EndDocumentLoad' events from the Mozilla browser. It maintains a set of
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'echo requesters'. When the observer receives an event notification, it
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forwards the event to all echo requesters. If the forward fails (most
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likely because the application is no longer in memory), the echo requester
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is automatically removed from the set.
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Usage:
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nsDocLoadObserver& observer = nsDocLoadObserver::Instance();
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observer.Register();
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observer.AddEchoRequester('App1');
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observer.AddEchoRequester('App2');
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----------------------------------------------------------------------------*/
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class nsDocLoadObserver : public nsIObserver
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{
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public:
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nsDocLoadObserver();
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virtual ~nsDocLoadObserver();
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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// add an application to be notified when an 'EndDocumentLoad' has occurred
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void AddEchoRequester(OSType appSignature);
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void RemoveEchoRequester(OSType appSignature);
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protected:
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// register the observer with the nsIObserverService. After this object
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// has been successfully registered, this method will simply return
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// immediately.
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void Register();
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void Unregister();
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private:
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// 'true' if this handler has been successfully registered with the nsIObserverService
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PRBool mRegistered;
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nsVoidArray mEchoRequesters;
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};
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#endif // nsDocLoadObserver_h_
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