348 lines
9.9 KiB
C++
348 lines
9.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications 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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* Pierre Phaneuf <pp@ludusdesign.com>
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*/
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#include "nsProxyEvent.h"
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#include "nsProxyObjectManager.h"
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#include "nsProxyEventPrivate.h"
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#include "nsRepository.h"
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#include "nsIServiceManager.h"
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#include "nsCOMPtr.h"
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#include "nsIAllocator.h"
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#include "nsHashtable.h"
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#include "nsAutoLock.h"
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#include "nsIInterfaceInfoManager.h"
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#include "xptcall.h"
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// LIFETIME_CACHE will cache class for the entire cyle of the application.
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#define LIFETIME_CACHE
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static uint32 zero_methods_descriptor;
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static NS_DEFINE_IID(kProxyEventClassIID, NS_PROXYEVENT_CLASS_IID);
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/* ssc@netscape.com wishes he could get rid of this instance of
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* |NS_DEFINE_IID|, but |ProxyEventClassIdentity| is not visible from
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* here.
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*/
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static NS_DEFINE_IID(kProxyObject_Identity_Class_IID, NS_PROXYEVENT_IDENTITY_CLASS_IID);
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//////////////////////////////////////////////////////////////////////////////////////////////////
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// nsProxyEventClass
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//////////////////////////////////////////////////////////////////////////////////////////////////
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NS_IMPL_THREADSAFE_ISUPPORTS(nsProxyEventClass, kProxyEventClassIID)
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// static
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nsProxyEventClass*
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nsProxyEventClass::GetNewOrUsedClass(REFNSIID aIID)
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{
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/* find in our hash table */
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nsProxyObjectManager *manager = nsProxyObjectManager::GetInstance();
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if (manager == nsnull) return nsnull;
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// dont need to lock the map, because this is only called
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// by nsProxyEventClass::GetNewOrUsed which locks it for us.
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nsHashtable *iidToClassMap = manager->GetIIDToProxyClassMap();
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if (iidToClassMap == nsnull)
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{
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return nsnull;
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}
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nsProxyEventClass* clazz = nsnull;
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nsIDKey key(aIID);
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#ifdef PROXYEVENTCLASS_DEBUG
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char* iidStr = aIID.ToString();
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printf("GetNewOrUsedClass %s\n", iidStr);
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nsCRT::free(iidStr);
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#endif
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clazz = (nsProxyEventClass*) iidToClassMap->Get(&key);
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if(clazz)
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{
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NS_ADDREF(clazz);
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#ifdef PROXYEVENTCLASS_DEBUG
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char* iidStr = aIID.ToString();
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printf("GetNewOrUsedClass %s hit\n", iidStr);
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nsCRT::free(iidStr);
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#endif
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}
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else
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{
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nsCOMPtr<nsIInterfaceInfoManager> iimgr = getter_AddRefs(XPTI_GetInterfaceInfoManager());
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if(iimgr)
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{
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nsCOMPtr<nsIInterfaceInfo> info;
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if(NS_SUCCEEDED(iimgr->GetInfoForIID(&aIID, getter_AddRefs(info))))
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{
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/*
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Check to see if isISupportsDescendent
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*/
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nsCOMPtr<nsIInterfaceInfo> oldest = info;
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nsCOMPtr<nsIInterfaceInfo> parent;
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while(NS_SUCCEEDED(oldest->GetParent(getter_AddRefs(parent))))
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{
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oldest = parent;
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}
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PRBool isISupportsDescendent = PR_FALSE;
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nsID* iid;
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if(NS_SUCCEEDED(oldest->GetIID(&iid)))
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{
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isISupportsDescendent = iid->Equals(NS_GET_IID(nsISupports));
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nsAllocator::Free(iid);
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}
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NS_VERIFY(isISupportsDescendent,"!isISupportsDescendent");
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if (isISupportsDescendent)
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{
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clazz = new nsProxyEventClass(aIID, info);
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if(!clazz->mDescriptors)
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NS_RELEASE(clazz); // sets clazz to NULL
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}
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}
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}
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}
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return clazz;
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}
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nsProxyEventClass::nsProxyEventClass()
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{
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NS_WARNING("This constructor should never be called");
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}
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nsProxyEventClass::nsProxyEventClass(REFNSIID aIID, nsIInterfaceInfo* aInfo)
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: mIID(aIID),
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mDescriptors(NULL)
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{
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NS_INIT_REFCNT();
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NS_ADDREF_THIS();
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mInfo = aInfo;
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/* add use to the used classes */
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nsIDKey key(aIID);
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nsProxyObjectManager *manager = nsProxyObjectManager::GetInstance();
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if (manager == nsnull) return;
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// dont need to lock the map, because this is only called
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// by GetNewOrUsed which locks it for us.
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nsHashtable *iidToClassMap = manager->GetIIDToProxyClassMap();
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if (iidToClassMap != nsnull)
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{
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iidToClassMap->Put(&key, this);
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#ifdef LIFETIME_CACHE
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// extra addref to hold it in the cache
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NS_ADDREF_THIS();
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#endif
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#ifdef PROXYEVENTCLASS_DEBUG
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char* iidStr = aIID.ToString();
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printf("GetNewOrUsedClass %s put\n", iidStr);
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nsCRT::free(iidStr);
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#endif
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}
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uint16 methodCount;
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if(NS_SUCCEEDED(mInfo->GetMethodCount(&methodCount)))
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{
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if(methodCount)
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{
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int wordCount = (methodCount/32)+1;
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if(NULL != (mDescriptors = new uint32[wordCount]))
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{
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memset(mDescriptors, 0, wordCount * sizeof(uint32));
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}
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}
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else
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{
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mDescriptors = &zero_methods_descriptor;
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}
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}
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}
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nsProxyEventClass::~nsProxyEventClass()
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{
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if(mDescriptors && mDescriptors != &zero_methods_descriptor)
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delete [] mDescriptors;
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#ifndef LIFETIME_CACHE
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nsIDKey key(mIID);
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nsProxyObjectManager *manager = nsProxyObjectManager::GetInstance();
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if (manager == nsnull) return;
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nsAutoLock lock(manager->GetMapLock());
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nsHashtable *iidToClassMap = manager->GetIIDToProxyClassMap();
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if (iidToClassMap != nsnull)
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{
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iidToClassMap->Remove(&key);
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#ifdef PROXYEVENTCLASS_DEBUG
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char* iidStr = mIID.ToString();
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printf("GetNewOrUsedClass %s remove\n", iidStr);
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nsCRT::free(iidStr);
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#endif
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}
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#endif
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}
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nsresult
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nsProxyEventClass::CallQueryInterfaceOnProxy(nsProxyEventObject* self, REFNSIID aIID, nsProxyEventObject** aInstancePtr)
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{
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NS_PRECONDITION(aInstancePtr, "Requires non-null result");
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nsresult rv;
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*aInstancePtr = nsnull; // in case of error.
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// The functions we will call: QueryInterface(REFNSIID aIID, void** aInstancePtr)
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nsXPTCMiniVariant var[2];
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var[0].val.p = (void*)&aIID;
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var[1].val.p = (void*)aInstancePtr;
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nsIInterfaceInfo *interfaceInfo;
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const nsXPTMethodInfo *mi;
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nsCOMPtr<nsIInterfaceInfoManager> iim = getter_AddRefs(XPTI_GetInterfaceInfoManager());
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if (!iim) return NS_NOINTERFACE;
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iim->GetInfoForName("nsISupports", &interfaceInfo);
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interfaceInfo->GetMethodInfo(0, &mi); // 0 is QueryInterface
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rv = self->CallMethod(0, mi, var);
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if (NS_SUCCEEDED(rv))
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{
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nsISupports *aIdentificationObject;
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rv = (*aInstancePtr)->QueryInterface(kProxyObject_Identity_Class_IID, (void**)&aIdentificationObject);
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if (NS_FAILED(rv))
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{
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// okay, aInstancePtr was not a proxy. Lets create one.
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nsProxyObjectManager *manager = nsProxyObjectManager::GetInstance();
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if (manager == nsnull)
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{
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NS_IF_RELEASE((*aInstancePtr));
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return NS_ERROR_FAILURE;
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}
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rv = manager->GetProxyObject(self->GetQueue(),
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aIID,
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self->GetRealObject(),
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self->GetProxyType(),
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(void**)&aIdentificationObject);
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}
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NS_IF_RELEASE((*aInstancePtr));
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(*aInstancePtr) = NS_STATIC_CAST(nsProxyEventObject*, aIdentificationObject);
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}
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return rv;
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}
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/***************************************************************************/
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// This 'ProxyEventClassIdentity' class and singleton allow us to figure out if
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// any given nsISupports* is implemented by a nsProxy object. This is done
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// using a QueryInterface call on the interface pointer with our ID. If
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// that call returns NS_OK and the pointer is to a nsProxyEventObject. It must
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// be released when done.
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// NS_PROXYEVENT_IDENTITY_CLASS_IID defined in nsProxyEventPrivate.h
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class ProxyEventClassIdentity
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{
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// no instance methods...
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_PROXYEVENT_IDENTITY_CLASS_IID)
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static void* GetSingleton()
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{
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static ProxyEventClassIdentity* singleton = NULL;
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if(!singleton)
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singleton = new ProxyEventClassIdentity();
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return (void*) singleton;
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}
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};
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NS_IMETHODIMP
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nsProxyEventClass::DelegatedQueryInterface(nsProxyEventObject* self,
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REFNSIID aIID,
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void** aInstancePtr)
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{
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if(aIID.Equals(NS_GET_IID(ProxyEventClassIdentity)))
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{
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*aInstancePtr = (void**)self; //todo this should be a static cast
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NS_ADDREF(self);
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return NS_OK;
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}
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nsProxyEventObject* sibling;
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// This includes checking for nsISupports and the iid of self.
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// And it also checks for other wrappers that have been constructed
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// for this object.
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if(nsnull != (sibling = self->Find(aIID)))
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{
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NS_ADDREF(sibling);
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*aInstancePtr = (void*) sibling;
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return NS_OK;
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}
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// check if asking for an interface that we inherit from
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nsCOMPtr<nsIInterfaceInfo> current = GetInterfaceInfo();
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nsCOMPtr<nsIInterfaceInfo> parent;
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while(NS_SUCCEEDED(current->GetParent(getter_AddRefs(parent))) && parent)
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{
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current = parent;
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nsIID* iid;
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if(NS_SUCCEEDED(current->GetIID(&iid)) && iid)
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{
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PRBool found = aIID.Equals(*iid);
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nsAllocator::Free(iid);
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if(found)
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{
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*aInstancePtr = (void*) self;
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NS_ADDREF(self);
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return NS_OK;
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}
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}
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}
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return CallQueryInterfaceOnProxy(self, aIID, (nsProxyEventObject**)aInstancePtr);
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}
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