mirror of
https://github.com/mozilla/gecko-dev.git
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360 lines
9.8 KiB
C++
360 lines
9.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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 License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsIServiceManager.h"
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#include "nsVector.h"
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#include "prcmon.h"
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// XXX move to nsID.h or nsHashtable.h? (copied from nsRepository.cpp)
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class IDKey: public nsHashKey {
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private:
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nsID id;
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public:
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IDKey(const nsID &aID) {
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id = aID;
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}
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PRUint32 HashValue(void) const {
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return id.m0;
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}
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PRBool Equals(const nsHashKey *aKey) const {
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return (id.Equals(((const IDKey *) aKey)->id));
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}
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nsHashKey *Clone(void) const {
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return new IDKey(id);
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}
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};
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class nsServiceEntry {
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public:
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nsServiceEntry(const nsCID& cid, nsISupports* service);
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~nsServiceEntry();
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nsresult AddListener(nsIShutdownListener* listener);
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nsresult RemoveListener(nsIShutdownListener* listener);
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nsresult NotifyListeners(void);
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const nsCID& mClassID;
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nsISupports* mService;
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nsVector* mListeners; // nsVector<nsIShutdownListener>
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};
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nsServiceEntry::nsServiceEntry(const nsCID& cid, nsISupports* service)
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: mClassID(cid), mService(service), mListeners(NULL)
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{
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}
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nsServiceEntry::~nsServiceEntry()
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{
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if (mListeners) {
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NS_ASSERTION(mListeners->GetSize() == 0, "listeners not removed or notified");
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#if 0
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PRUint32 size = mListeners->GetSize();
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for (PRUint32 i = 0; i < size; i++) {
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nsIShutdownListener* listener = (nsIShutdownListener*)(*mListeners)[i];
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listener->Release();
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}
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#endif
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delete mListeners;
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}
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}
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nsresult
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nsServiceEntry::AddListener(nsIShutdownListener* listener)
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{
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if (listener == NULL)
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return NS_OK;
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if (mListeners == NULL) {
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mListeners = new nsVector();
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if (mListeners == NULL)
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return NS_ERROR_OUT_OF_MEMORY;
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}
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PRInt32 err = mListeners->Add(listener);
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listener->AddRef();
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return err == -1 ? NS_ERROR_FAILURE : NS_OK;
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}
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nsresult
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nsServiceEntry::RemoveListener(nsIShutdownListener* listener)
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{
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if (listener == NULL)
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return NS_OK;
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NS_ASSERTION(mListeners, "no listeners added yet");
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PRUint32 size = mListeners->GetSize();
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for (PRUint32 i = 0; i < size; i++) {
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if ((*mListeners)[i] == listener) {
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mListeners->Remove(i);
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listener->Release();
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return NS_OK;
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}
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}
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NS_ASSERTION(0, "unregistered shutdown listener");
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return NS_ERROR_FAILURE;
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}
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nsresult
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nsServiceEntry::NotifyListeners(void)
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{
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if (mListeners) {
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PRUint32 size = mListeners->GetSize();
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for (PRUint32 i = 0; i < size; i++) {
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nsIShutdownListener* listener = (nsIShutdownListener*)(*mListeners)[0];
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nsresult err = listener->OnShutdown(mClassID, mService);
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if (err) return err;
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listener->Release();
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mListeners->Remove(0);
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}
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NS_ASSERTION(mListeners->GetSize() == 0, "failed to notify all listeners");
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delete mListeners;
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mListeners = NULL;
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}
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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class nsServiceManagerImpl : public nsIServiceManager {
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public:
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NS_IMETHOD
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GetService(const nsCID& aClass, const nsIID& aIID,
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nsISupports* *result,
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nsIShutdownListener* shutdownListener = NULL);
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NS_IMETHOD
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ReleaseService(const nsCID& aClass, nsISupports* service,
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nsIShutdownListener* shutdownListener = NULL);
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NS_IMETHOD
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ShutdownService(const nsCID& aClass);
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nsServiceManagerImpl(void);
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NS_DECL_ISUPPORTS
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protected:
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virtual ~nsServiceManagerImpl(void);
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nsHashtable* mServices; // nsHashtable<nsServiceEntry>
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};
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nsServiceManagerImpl::nsServiceManagerImpl(void)
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{
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NS_INIT_REFCNT();
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mServices = new nsHashtable();
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NS_ASSERTION(mServices, "out of memory already?");
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}
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static PRBool
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DeleteEntry(nsHashKey *aKey, void *aData, void* closure)
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{
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nsServiceEntry* entry = (nsServiceEntry*)aData;
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entry->mService->Release();
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delete entry;
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return PR_TRUE;
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}
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nsServiceManagerImpl::~nsServiceManagerImpl(void)
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{
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mServices->Enumerate(DeleteEntry);
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delete mServices;
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}
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static NS_DEFINE_IID(kIServiceManagerIID, NS_ISERVICEMANAGER_IID);
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static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
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NS_IMPL_ADDREF(nsServiceManagerImpl);
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NS_IMPL_RELEASE(nsServiceManagerImpl);
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nsresult
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nsServiceManagerImpl::QueryInterface(const nsIID& aIID, void* *aInstancePtr)
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{
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if (NULL == aInstancePtr) {
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return NS_ERROR_NULL_POINTER;
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}
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*aInstancePtr = NULL;
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if (aIID.Equals(kIServiceManagerIID) ||
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aIID.Equals(kISupportsIID)) {
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*aInstancePtr = (void*) this;
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AddRef();
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return NS_OK;
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}
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return NS_NOINTERFACE;
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}
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nsresult
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nsServiceManagerImpl::GetService(const nsCID& aClass, const nsIID& aIID,
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nsISupports* *result,
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nsIShutdownListener* shutdownListener)
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{
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nsresult err = NS_OK;
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PR_CEnterMonitor(this);
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IDKey key(aClass);
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nsServiceEntry* entry = (nsServiceEntry*)mServices->Get(&key);
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if (entry) {
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nsISupports* service;
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err = entry->mService->QueryInterface(aIID, (void**)&service);
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if (err == NS_OK) {
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err = entry->AddListener(shutdownListener);
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if (err == NS_OK) {
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*result = service;
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}
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}
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}
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else {
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nsISupports* service;
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err = nsRepository::CreateInstance(aClass, NULL, aIID, (void**)&service);
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if (err == NS_OK) {
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entry = new nsServiceEntry(aClass, service);
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if (entry == NULL) {
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service->Release();
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err = NS_ERROR_OUT_OF_MEMORY;
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}
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else {
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err = entry->AddListener(shutdownListener);
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if (err == NS_OK) {
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mServices->Put(&key, entry);
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*result = service;
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}
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else {
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service->Release();
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delete entry;
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}
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}
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}
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}
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PR_CExitMonitor(this);
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return err;
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}
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nsresult
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nsServiceManagerImpl::ReleaseService(const nsCID& aClass, nsISupports* service,
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nsIShutdownListener* shutdownListener)
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{
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nsresult err = NS_OK;
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PR_CEnterMonitor(this);
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IDKey key(aClass);
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nsServiceEntry* entry = (nsServiceEntry*)mServices->Get(&key);
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NS_ASSERTION(entry, "service not found");
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NS_ASSERTION(entry->mService == service, "service looked failed");
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if (entry) {
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err = entry->RemoveListener(shutdownListener);
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// XXX Is this too aggressive? Maybe we should have a memory
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// pressure API that releases services if they're not in use so
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// that we don't thrash.
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nsrefcnt cnt = service->Release();
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if (err == NS_OK && cnt == 0) {
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mServices->Remove(&key);
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delete entry;
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}
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}
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PR_CExitMonitor(this);
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return err;
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}
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nsresult
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nsServiceManagerImpl::ShutdownService(const nsCID& aClass)
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{
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nsresult err = NS_OK;
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PR_CEnterMonitor(this);
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IDKey key(aClass);
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nsServiceEntry* entry = (nsServiceEntry*)mServices->Get(&key);
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if (entry == NULL) {
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err = NS_ERROR_SERVICE_NOT_FOUND;
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}
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else {
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entry->mService->AddRef();
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err = entry->NotifyListeners();
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nsrefcnt cnt = entry->mService->Release();
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if (err == NS_OK && cnt == 0) {
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mServices->Remove(&key);
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err = nsRepository::FreeLibraries();
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}
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else
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err = NS_ERROR_SERVICE_IN_USE;
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}
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PR_CExitMonitor(this);
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return err;
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}
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////////////////////////////////////////////////////////////////////////////////
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// Global service manager interface (see nsIServiceManager.h)
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nsIServiceManager* nsServiceManager::globalServiceManager = NULL;
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nsresult
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nsServiceManager::GetGlobalServiceManager(nsIServiceManager* *result)
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{
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if (globalServiceManager == NULL) {
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globalServiceManager = new nsServiceManagerImpl();
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if (globalServiceManager == NULL)
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return NS_ERROR_OUT_OF_MEMORY;
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globalServiceManager->AddRef();
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}
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*result = globalServiceManager;
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return NS_OK;
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}
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nsresult
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nsServiceManager::GetService(const nsCID& aClass, const nsIID& aIID,
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nsISupports* *result,
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nsIShutdownListener* shutdownListener)
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{
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nsIServiceManager* mgr;
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nsresult rslt = GetGlobalServiceManager(&mgr);
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if (rslt != NS_OK) return rslt;
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return mgr->GetService(aClass, aIID, result, shutdownListener);
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}
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nsresult
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nsServiceManager::ReleaseService(const nsCID& aClass, nsISupports* service,
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nsIShutdownListener* shutdownListener)
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{
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nsIServiceManager* mgr;
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nsresult rslt = GetGlobalServiceManager(&mgr);
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if (rslt != NS_OK) return rslt;
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return mgr->ReleaseService(aClass, service, shutdownListener);
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}
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nsresult
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nsServiceManager::ShutdownService(const nsCID& aClass)
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{
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nsIServiceManager* mgr;
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nsresult rslt = GetGlobalServiceManager(&mgr);
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if (rslt != NS_OK) return rslt;
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return mgr->ShutdownService(aClass);
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}
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////////////////////////////////////////////////////////////////////////////////
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