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pjs/xpcom/components/nsCategoryManager.cpp

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22 KiB
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Scott Collins <scc@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#define PL_ARENA_CONST_ALIGN_MASK 7
#include "nsICategoryManager.h"
#include "nsCategoryManager.h"
#include "plarena.h"
#include "prio.h"
#include "prprf.h"
#include "prlock.h"
#include "nsCOMPtr.h"
#include "nsTHashtable.h"
#include "nsClassHashtable.h"
#include "nsIFactory.h"
#include "nsIStringEnumerator.h"
#include "nsSupportsPrimitives.h"
#include "nsServiceManagerUtils.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsReadableUtils.h"
#include "nsCRT.h"
#include "nsQuickSort.h"
#include "nsEnumeratorUtils.h"
#include "nsIProxyObjectManager.h"
class nsIComponentLoaderManager;
/*
CategoryDatabase
contains 0 or more 1-1 mappings of string to Category
each Category contains 0 or more 1-1 mappings of string keys to string values
In other words, the CategoryDatabase is a tree, whose root is a hashtable.
Internal nodes (or Categories) are hashtables. Leaf nodes are strings.
The leaf strings are allocated in an arena, because we assume they're not
going to change much ;)
*/
#define NS_CATEGORYMANAGER_ARENA_SIZE (1024 * 8)
// pulled in from nsComponentManager.cpp
char* ArenaStrdup(const char* s, PLArenaPool* aArena);
//
// BaseStringEnumerator is subclassed by EntryEnumerator and
// CategoryEnumerator
//
class BaseStringEnumerator
: public nsISimpleEnumerator,
nsIUTF8StringEnumerator
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSISIMPLEENUMERATOR
NS_DECL_NSIUTF8STRINGENUMERATOR
protected:
// Callback function for NS_QuickSort to sort mArray
static int SortCallback(const void *, const void *, void *);
BaseStringEnumerator()
: mArray(nsnull),
mCount(0),
mSimpleCurItem(0),
mStringCurItem(0) { }
// A virtual destructor is needed here because subclasses of
// BaseStringEnumerator do not implement their own Release() method.
virtual ~BaseStringEnumerator()
{
if (mArray)
delete[] mArray;
}
void Sort();
const char** mArray;
PRUint32 mCount;
PRUint32 mSimpleCurItem;
PRUint32 mStringCurItem;
};
NS_IMPL_ISUPPORTS2(BaseStringEnumerator, nsISimpleEnumerator, nsIUTF8StringEnumerator)
NS_IMETHODIMP
BaseStringEnumerator::HasMoreElements(PRBool *_retval)
{
*_retval = (mSimpleCurItem < mCount);
return NS_OK;
}
NS_IMETHODIMP
BaseStringEnumerator::GetNext(nsISupports **_retval)
{
if (mSimpleCurItem >= mCount)
return NS_ERROR_FAILURE;
nsSupportsDependentCString* str =
new nsSupportsDependentCString(mArray[mSimpleCurItem++]);
if (!str)
return NS_ERROR_OUT_OF_MEMORY;
*_retval = str;
NS_ADDREF(*_retval);
return NS_OK;
}
NS_IMETHODIMP
BaseStringEnumerator::HasMore(PRBool *_retval)
{
*_retval = (mStringCurItem < mCount);
return NS_OK;
}
NS_IMETHODIMP
BaseStringEnumerator::GetNext(nsACString& _retval)
{
if (mStringCurItem >= mCount)
return NS_ERROR_FAILURE;
_retval = nsDependentCString(mArray[mStringCurItem++]);
return NS_OK;
}
int
BaseStringEnumerator::SortCallback(const void *e1, const void *e2,
void * /*unused*/)
{
char const *const *s1 = NS_REINTERPRET_CAST(char const *const *, e1);
char const *const *s2 = NS_REINTERPRET_CAST(char const *const *, e2);
return strcmp(*s1, *s2);
}
void
BaseStringEnumerator::Sort()
{
NS_QuickSort(mArray, mCount, sizeof(mArray[0]), SortCallback, nsnull);
}
//
// EntryEnumerator is the wrapper that allows nsICategoryManager::EnumerateCategory
//
class EntryEnumerator
: public BaseStringEnumerator
{
public:
static EntryEnumerator* Create(nsTHashtable<CategoryLeaf>& aTable);
private:
static PLDHashOperator PR_CALLBACK
enumfunc_createenumerator(CategoryLeaf* aLeaf, void* userArg);
};
PLDHashOperator PR_CALLBACK
EntryEnumerator::enumfunc_createenumerator(CategoryLeaf* aLeaf, void* userArg)
{
EntryEnumerator* mythis = NS_STATIC_CAST(EntryEnumerator*, userArg);
mythis->mArray[mythis->mCount++] = aLeaf->GetKey();
return PL_DHASH_NEXT;
}
EntryEnumerator*
EntryEnumerator::Create(nsTHashtable<CategoryLeaf>& aTable)
{
EntryEnumerator* enumObj = new EntryEnumerator();
if (!enumObj)
return nsnull;
enumObj->mArray = new char const* [aTable.Count()];
if (!enumObj->mArray) {
delete enumObj;
return nsnull;
}
aTable.EnumerateEntries(enumfunc_createenumerator, enumObj);
enumObj->Sort();
return enumObj;
}
//
// CategoryNode implementations
//
CategoryNode*
CategoryNode::Create(PLArenaPool* aArena)
{
CategoryNode* node = new(aArena) CategoryNode();
if (!node)
return nsnull;
if (!node->mTable.Init()) {
delete node;
return nsnull;
}
node->mLock = PR_NewLock();
if (!node->mLock) {
delete node;
return nsnull;
}
return node;
}
CategoryNode::~CategoryNode()
{
if (mLock)
PR_DestroyLock(mLock);
}
void*
CategoryNode::operator new(size_t aSize, PLArenaPool* aArena)
{
void* p;
PL_ARENA_ALLOCATE(p, aArena, aSize);
return p;
}
NS_METHOD
CategoryNode::GetLeaf(const char* aEntryName,
char** _retval)
{
PR_Lock(mLock);
nsresult rv = NS_ERROR_NOT_AVAILABLE;
CategoryLeaf* ent =
mTable.GetEntry(aEntryName);
// we only want the non-persistent value
if (ent && ent->nonpValue) {
*_retval = nsCRT::strdup(ent->nonpValue);
if (*_retval)
rv = NS_OK;
}
PR_Unlock(mLock);
return rv;
}
NS_METHOD
CategoryNode::AddLeaf(const char* aEntryName,
const char* aValue,
PRBool aPersist,
PRBool aReplace,
char** _retval,
PLArenaPool* aArena)
{
PR_Lock(mLock);
CategoryLeaf* leaf =
mTable.GetEntry(aEntryName);
nsresult rv = NS_OK;
if (leaf) {
//if the entry was found, aReplace must be specified
if (!aReplace && (leaf->nonpValue || (aPersist && leaf->pValue )))
rv = NS_ERROR_INVALID_ARG;
} else {
const char* arenaEntryName = ArenaStrdup(aEntryName, aArena);
if (!arenaEntryName) {
rv = NS_ERROR_OUT_OF_MEMORY;
} else {
leaf = mTable.PutEntry(arenaEntryName);
if (!leaf)
rv = NS_ERROR_OUT_OF_MEMORY;
}
}
if (NS_SUCCEEDED(rv)) {
const char* arenaValue = ArenaStrdup(aValue, aArena);
if (!arenaValue) {
rv = NS_ERROR_OUT_OF_MEMORY;
} else {
if (_retval) {
const char *toDup = leaf->nonpValue ? leaf->nonpValue : leaf->pValue;
if (toDup) {
*_retval = ToNewCString(nsDependentCString(toDup));
if (!*_retval)
return NS_ERROR_OUT_OF_MEMORY;
}
else {
*_retval = nsnull;
}
}
leaf->nonpValue = arenaValue;
if (aPersist)
leaf->pValue = arenaValue;
}
}
PR_Unlock(mLock);
return rv;
}
NS_METHOD
CategoryNode::DeleteLeaf(const char* aEntryName,
PRBool aDontPersist)
{
// we don't throw any errors, because it normally doesn't matter
// and it makes JS a lot cleaner
PR_Lock(mLock);
if (aDontPersist) {
// we can just remove the entire hash entry without introspection
mTable.RemoveEntry(aEntryName);
} else {
// if we are keeping the persistent value, we need to look at
// the contents of the current entry
CategoryLeaf* leaf = mTable.GetEntry(aEntryName);
if (leaf) {
if (leaf->pValue) {
leaf->nonpValue = nsnull;
} else {
// if there is no persistent value, just remove the entry
mTable.RawRemoveEntry(leaf);
}
}
}
PR_Unlock(mLock);
return NS_OK;
}
NS_METHOD
CategoryNode::Enumerate(nsISimpleEnumerator **_retval)
{
NS_ENSURE_ARG_POINTER(_retval);
PR_Lock(mLock);
EntryEnumerator* enumObj = EntryEnumerator::Create(mTable);
PR_Unlock(mLock);
if (!enumObj)
return NS_ERROR_OUT_OF_MEMORY;
*_retval = enumObj;
NS_ADDREF(*_retval);
return NS_OK;
}
struct persistent_userstruct {
PRFileDesc* fd;
const char* categoryName;
PRBool success;
};
PLDHashOperator PR_CALLBACK
enumfunc_pentries(CategoryLeaf* aLeaf, void* userArg)
{
persistent_userstruct* args =
NS_STATIC_CAST(persistent_userstruct*, userArg);
PLDHashOperator status = PL_DHASH_NEXT;
if (aLeaf->pValue) {
if (PR_fprintf(args->fd,
"%s,%s,%s\n",
args->categoryName,
aLeaf->GetKey(),
aLeaf->pValue) == (PRUint32) -1) {
args->success = PR_FALSE;
status = PL_DHASH_STOP;
}
}
return status;
}
PRBool
CategoryNode::WritePersistentEntries(PRFileDesc* fd, const char* aCategoryName)
{
persistent_userstruct args = {
fd,
aCategoryName,
PR_TRUE
};
PR_Lock(mLock);
mTable.EnumerateEntries(enumfunc_pentries, &args);
PR_Unlock(mLock);
return args.success;
}
//
// CategoryEnumerator class
//
class CategoryEnumerator
: public BaseStringEnumerator
{
public:
static CategoryEnumerator* Create(nsClassHashtable<nsDepCharHashKey, CategoryNode>& aTable);
private:
static PLDHashOperator PR_CALLBACK
enumfunc_createenumerator(const char* aStr,
CategoryNode* aNode,
void* userArg);
};
CategoryEnumerator*
CategoryEnumerator::Create(nsClassHashtable<nsDepCharHashKey, CategoryNode>& aTable)
{
CategoryEnumerator* enumObj = new CategoryEnumerator();
if (!enumObj)
return nsnull;
enumObj->mArray = new const char* [aTable.Count()];
if (!enumObj->mArray) {
delete enumObj;
return nsnull;
}
aTable.EnumerateRead(enumfunc_createenumerator, enumObj);
return enumObj;
}
PLDHashOperator PR_CALLBACK
CategoryEnumerator::enumfunc_createenumerator(const char* aStr, CategoryNode* aNode, void* userArg)
{
CategoryEnumerator* mythis = NS_STATIC_CAST(CategoryEnumerator*, userArg);
// if a category has no entries, we pretend it doesn't exist
if (aNode->Count())
mythis->mArray[mythis->mCount++] = aStr;
return PL_DHASH_NEXT;
}
//
// nsCategoryManager implementations
//
NS_IMPL_THREADSAFE_ISUPPORTS1(nsCategoryManager, nsICategoryManager)
nsCategoryManager*
nsCategoryManager::Create()
{
nsCategoryManager* manager = new nsCategoryManager();
if (!manager)
return nsnull;
PL_INIT_ARENA_POOL(&(manager->mArena), "CategoryManagerArena",
NS_CATEGORYMANAGER_ARENA_SIZE); // this never fails
if (!manager->mTable.Init()) {
delete manager;
return nsnull;
}
manager->mLock = PR_NewLock();
if (!manager->mLock) {
delete manager;
return nsnull;
}
return manager;
}
nsCategoryManager::~nsCategoryManager()
{
if (mLock)
PR_DestroyLock(mLock);
// the hashtable contains entries that must be deleted before the arena is
// destroyed, or else you will have PRLocks undestroyed and other Really
// Bad Stuff (TM)
mTable.Clear();
PL_FinishArenaPool(&mArena);
}
inline CategoryNode*
nsCategoryManager::get_category(const char* aName) {
CategoryNode* node;
if (!mTable.Get(aName, &node)) {
return nsnull;
}
return node;
}
void
nsCategoryManager::NotifyObservers( const char *aTopic,
const char *aCategoryName,
const char *aEntryName )
{
if (mSuppressNotifications)
return;
nsCOMPtr<nsIObserverService> observerService
(do_GetService("@mozilla.org/observer-service;1"));
if (!observerService)
return;
nsCOMPtr<nsIObserverService> obsProxy;
NS_GetProxyForObject(NS_UI_THREAD_EVENTQ,
NS_GET_IID(nsIObserverService),
observerService,
PROXY_ASYNC,
getter_AddRefs(obsProxy));
if (!obsProxy) return;
if (aEntryName) {
nsCOMPtr<nsISupportsCString> entry
(do_CreateInstance (NS_SUPPORTS_CSTRING_CONTRACTID));
if (!entry)
return;
nsresult rv = entry->SetData(nsDependentCString(aEntryName));
if (NS_FAILED(rv))
return;
obsProxy->NotifyObservers(entry, aTopic,
NS_ConvertUTF8toUTF16(aCategoryName).get());
} else {
obsProxy->NotifyObservers(this, aTopic,
NS_ConvertUTF8toUTF16(aCategoryName).get());
}
}
NS_IMETHODIMP
nsCategoryManager::GetCategoryEntry( const char *aCategoryName,
const char *aEntryName,
char **_retval )
{
NS_ENSURE_ARG_POINTER(aCategoryName);
NS_ENSURE_ARG_POINTER(aEntryName);
NS_ENSURE_ARG_POINTER(_retval);
nsresult status = NS_ERROR_NOT_AVAILABLE;
PR_Lock(mLock);
CategoryNode* category = get_category(aCategoryName);
PR_Unlock(mLock);
if (category) {
status = category->GetLeaf(aEntryName, _retval);
}
return status;
}
NS_IMETHODIMP
nsCategoryManager::AddCategoryEntry( const char *aCategoryName,
const char *aEntryName,
const char *aValue,
PRBool aPersist,
PRBool aReplace,
char **_retval )
{
NS_ENSURE_ARG_POINTER(aCategoryName);
NS_ENSURE_ARG_POINTER(aEntryName);
NS_ENSURE_ARG_POINTER(aValue);
// Before we can insert a new entry, we'll need to
// find the |CategoryNode| to put it in...
PR_Lock(mLock);
CategoryNode* category = get_category(aCategoryName);
if (!category) {
// That category doesn't exist yet; let's make it.
category = CategoryNode::Create(&mArena);
char* categoryName = ArenaStrdup(aCategoryName, &mArena);
mTable.Put(categoryName, category);
}
PR_Unlock(mLock);
if (!category)
return NS_ERROR_OUT_OF_MEMORY;
nsresult rv = category->AddLeaf(aEntryName,
aValue,
aPersist,
aReplace,
_retval,
&mArena);
if (NS_SUCCEEDED(rv)) {
NotifyObservers(NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID,
aCategoryName, aEntryName);
}
return rv;
}
NS_IMETHODIMP
nsCategoryManager::DeleteCategoryEntry( const char *aCategoryName,
const char *aEntryName,
PRBool aDontPersist)
{
NS_ENSURE_ARG_POINTER(aCategoryName);
NS_ENSURE_ARG_POINTER(aEntryName);
/*
Note: no errors are reported since failure to delete
probably won't hurt you, and returning errors seriously
inconveniences JS clients
*/
PR_Lock(mLock);
CategoryNode* category = get_category(aCategoryName);
PR_Unlock(mLock);
if (!category)
return NS_OK;
nsresult rv = category->DeleteLeaf(aEntryName,
aDontPersist);
if (NS_SUCCEEDED(rv)) {
NotifyObservers(NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID,
aCategoryName, aEntryName);
}
return rv;
}
NS_IMETHODIMP
nsCategoryManager::DeleteCategory( const char *aCategoryName )
{
NS_ENSURE_ARG_POINTER(aCategoryName);
// the categories are arena-allocated, so we don't
// actually delete them. We just remove all of the
// leaf nodes.
PR_Lock(mLock);
CategoryNode* category = get_category(aCategoryName);
PR_Unlock(mLock);
if (category) {
category->Clear();
NotifyObservers(NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID,
aCategoryName, nsnull);
}
return NS_OK;
}
NS_IMETHODIMP
nsCategoryManager::EnumerateCategory( const char *aCategoryName,
nsISimpleEnumerator **_retval )
{
NS_ENSURE_ARG_POINTER(aCategoryName);
NS_ENSURE_ARG_POINTER(_retval);
PR_Lock(mLock);
CategoryNode* category = get_category(aCategoryName);
PR_Unlock(mLock);
if (!category) {
return NS_NewEmptyEnumerator(_retval);
}
return category->Enumerate(_retval);
}
NS_IMETHODIMP
nsCategoryManager::EnumerateCategories(nsISimpleEnumerator **_retval)
{
NS_ENSURE_ARG_POINTER(_retval);
PR_Lock(mLock);
CategoryEnumerator* enumObj = CategoryEnumerator::Create(mTable);
PR_Unlock(mLock);
if (!enumObj)
return NS_ERROR_OUT_OF_MEMORY;
*_retval = enumObj;
NS_ADDREF(*_retval);
return NS_OK;
}
struct writecat_struct {
PRFileDesc* fd;
PRBool success;
};
PLDHashOperator PR_CALLBACK
enumfunc_categories(const char* aKey, CategoryNode* aCategory, void* userArg)
{
writecat_struct* args = NS_STATIC_CAST(writecat_struct*, userArg);
PLDHashOperator result = PL_DHASH_NEXT;
if (!aCategory->WritePersistentEntries(args->fd, aKey)) {
args->success = PR_FALSE;
result = PL_DHASH_STOP;
}
return result;
}
NS_METHOD
nsCategoryManager::WriteCategoryManagerToRegistry(PRFileDesc* fd)
{
writecat_struct args = {
fd,
PR_TRUE
};
PR_Lock(mLock);
mTable.EnumerateRead(enumfunc_categories, &args);
PR_Unlock(mLock);
if (!args.success) {
return NS_ERROR_UNEXPECTED;
}
return NS_OK;
}
NS_METHOD
nsCategoryManager::SuppressNotifications(PRBool aSuppress)
{
mSuppressNotifications = aSuppress;
return NS_OK;
}
class nsCategoryManagerFactory : public nsIFactory
{
public:
nsCategoryManagerFactory() { }
NS_DECL_ISUPPORTS
NS_DECL_NSIFACTORY
};
NS_IMPL_ISUPPORTS1(nsCategoryManagerFactory, nsIFactory)
NS_IMETHODIMP
nsCategoryManagerFactory::CreateInstance( nsISupports* aOuter, const nsIID& aIID, void** aResult )
{
NS_ENSURE_ARG_POINTER(aResult);
*aResult = 0;
nsresult status = NS_OK;
if ( aOuter )
status = NS_ERROR_NO_AGGREGATION;
else
{
nsCategoryManager* raw_category_manager = nsCategoryManager::Create();
nsCOMPtr<nsICategoryManager> new_category_manager = raw_category_manager;
if ( new_category_manager )
status = new_category_manager->QueryInterface(aIID, aResult);
else
status = NS_ERROR_OUT_OF_MEMORY;
}
return status;
}
NS_IMETHODIMP
nsCategoryManagerFactory::LockFactory( PRBool )
{
// Not implemented...
return NS_OK;
}
nsresult
NS_CategoryManagerGetFactory( nsIFactory** aFactory )
{
// assert(aFactory);
nsresult status;
*aFactory = 0;
nsIFactory* new_factory = NS_STATIC_CAST(nsIFactory*, new nsCategoryManagerFactory);
if (new_factory)
{
*aFactory = new_factory;
NS_ADDREF(*aFactory);
status = NS_OK;
}
else
status = NS_ERROR_OUT_OF_MEMORY;
return status;
}
/*
* CreateServicesFromCategory()
*
* Given a category, this convenience functions enumerates the category and
* creates a service of every CID or ContractID registered under the category.
* If observerTopic is non null and the service implements nsIObserver,
* this will attempt to notify the observer with the origin, observerTopic string
* as parameter.
*/
NS_COM nsresult
NS_CreateServicesFromCategory(const char *category,
nsISupports *origin,
const char *observerTopic)
{
nsresult rv = NS_OK;
int nFailed = 0;
nsCOMPtr<nsICategoryManager> categoryManager =
do_GetService("@mozilla.org/categorymanager;1", &rv);
if (!categoryManager) return rv;
nsCOMPtr<nsISimpleEnumerator> enumerator;
rv = categoryManager->EnumerateCategory(category,
getter_AddRefs(enumerator));
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsISupports> entry;
while (NS_SUCCEEDED(enumerator->GetNext(getter_AddRefs(entry)))) {
// From here on just skip any error we get.
nsCOMPtr<nsISupportsCString> catEntry = do_QueryInterface(entry, &rv);
if (NS_FAILED(rv)) {
nFailed++;
continue;
}
nsCAutoString entryString;
rv = catEntry->GetData(entryString);
if (NS_FAILED(rv)) {
nFailed++;
continue;
}
nsXPIDLCString contractID;
rv = categoryManager->GetCategoryEntry(category,entryString.get(), getter_Copies(contractID));
if (NS_FAILED(rv)) {
nFailed++;
continue;
}
nsCOMPtr<nsISupports> instance = do_GetService(contractID, &rv);
if (NS_FAILED(rv)) {
nFailed++;
continue;
}
if (observerTopic) {
// try an observer, if it implements it.
nsCOMPtr<nsIObserver> observer = do_QueryInterface(instance, &rv);
if (NS_SUCCEEDED(rv) && observer)
observer->Observe(origin, observerTopic, EmptyString().get());
}
}
return (nFailed ? NS_ERROR_FAILURE : NS_OK);
}
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