mirror of
https://github.com/rn10950/RetroZilla.git
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357 lines
11 KiB
C++
357 lines
11 KiB
C++
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Simon Bünzli <zeniko@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Maintains a circular buffer of recent messages, and notifies
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* listeners when new messages are logged.
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*/
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/* Threadsafe. */
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#include "nsMemory.h"
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#include "nsIServiceManager.h"
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#include "nsIProxyObjectManager.h"
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#include "nsSupportsArray.h"
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#include "nsConsoleService.h"
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#include "nsConsoleMessage.h"
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NS_IMPL_THREADSAFE_ADDREF(nsConsoleService)
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NS_IMPL_THREADSAFE_RELEASE(nsConsoleService)
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NS_IMPL_QUERY_INTERFACE2_CI(nsConsoleService,
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nsIConsoleService,
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nsIConsoleService_MOZILLA_1_8_BRANCH)
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NS_IMPL_CI_INTERFACE_GETTER2(nsConsoleService,
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nsIConsoleService,
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nsIConsoleService_MOZILLA_1_8_BRANCH)
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nsConsoleService::nsConsoleService()
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: mMessages(nsnull), mCurrent(0), mFull(PR_FALSE), mListening(PR_FALSE), mLock(nsnull)
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{
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// XXX grab this from a pref!
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// hm, but worry about circularity, bc we want to be able to report
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// prefs errs...
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mBufferSize = 250;
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}
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nsConsoleService::~nsConsoleService()
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{
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PRUint32 i = 0;
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while (i < mBufferSize && mMessages[i] != nsnull) {
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NS_RELEASE(mMessages[i]);
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i++;
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}
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#ifdef DEBUG_mccabe
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if (mListeners.Count() != 0) {
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fprintf(stderr,
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"WARNING - %d console error listeners still registered!\n"
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"More calls to nsIConsoleService::UnregisterListener needed.\n",
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mListeners.Count());
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}
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#endif
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if (mMessages)
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nsMemory::Free(mMessages);
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if (mLock)
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PR_DestroyLock(mLock);
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}
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nsresult
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nsConsoleService::Init()
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{
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mMessages = (nsIConsoleMessage **)
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nsMemory::Alloc(mBufferSize * sizeof(nsIConsoleMessage *));
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if (!mMessages)
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return NS_ERROR_OUT_OF_MEMORY;
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// Array elements should be 0 initially for circular buffer algorithm.
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memset(mMessages, 0, mBufferSize * sizeof(nsIConsoleMessage *));
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mLock = PR_NewLock();
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if (!mLock)
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return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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static PRBool PR_CALLBACK snapshot_enum_func(nsHashKey *key, void *data, void* closure)
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{
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nsISupportsArray *array = (nsISupportsArray *)closure;
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// Copy each element into the temporary nsSupportsArray...
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array->AppendElement((nsISupports*)data);
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return PR_TRUE;
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}
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// nsIConsoleService methods
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NS_IMETHODIMP
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nsConsoleService::LogMessage(nsIConsoleMessage *message)
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{
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if (message == nsnull)
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return NS_ERROR_INVALID_ARG;
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nsSupportsArray listenersSnapshot;
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nsIConsoleMessage *retiredMessage;
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NS_ADDREF(message); // early, in case it's same as replaced below.
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/*
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* Lock while updating buffer, and while taking snapshot of
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* listeners array.
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*/
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{
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nsAutoLock lock(mLock);
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/*
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* If there's already a message in the slot we're about to replace,
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* we've wrapped around, and we need to release the old message. We
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* save a pointer to it, so we can release below outside the lock.
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*/
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retiredMessage = mMessages[mCurrent];
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mMessages[mCurrent++] = message;
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if (mCurrent == mBufferSize) {
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mCurrent = 0; // wrap around.
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mFull = PR_TRUE;
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}
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/*
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* Copy the listeners into the snapshot array - in case a listener
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* is removed during an Observe(...) notification...
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*/
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mListeners.Enumerate(snapshot_enum_func, &listenersSnapshot);
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}
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if (retiredMessage != nsnull)
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NS_RELEASE(retiredMessage);
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/*
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* Iterate through any registered listeners and tell them about
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* the message. We use the mListening flag to guard against
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* recursive message logs. This could sometimes result in
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* listeners being skipped because of activity on other threads,
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* when we only care about the recursive case.
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*/
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nsCOMPtr<nsIConsoleListener> listener;
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nsresult rv;
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nsresult returned_rv;
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PRUint32 snapshotCount;
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rv = listenersSnapshot.Count(&snapshotCount);
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if (NS_FAILED(rv))
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return rv;
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{
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nsAutoLock lock(mLock);
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if (mListening)
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return NS_OK;
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mListening = PR_TRUE;
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}
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returned_rv = NS_OK;
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for (PRUint32 i = 0; i < snapshotCount; i++) {
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rv = listenersSnapshot.GetElementAt(i, getter_AddRefs(listener));
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if (NS_FAILED(rv)) {
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returned_rv = rv;
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break; // fall thru to mListening restore code below.
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}
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listener->Observe(message);
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}
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{
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nsAutoLock lock(mLock);
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mListening = PR_FALSE;
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}
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return returned_rv;
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}
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NS_IMETHODIMP
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nsConsoleService::LogStringMessage(const PRUnichar *message)
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{
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nsConsoleMessage *msg = new nsConsoleMessage(message);
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return this->LogMessage(msg);
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}
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NS_IMETHODIMP
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nsConsoleService::GetMessageArray(nsIConsoleMessage ***messages, PRUint32 *count)
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{
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nsIConsoleMessage **messageArray;
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/*
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* Lock the whole method, as we don't want anyone mucking with mCurrent or
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* mFull while we're copying out the buffer.
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*/
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nsAutoLock lock(mLock);
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if (mCurrent == 0 && !mFull) {
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/*
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* Make a 1-length output array so that nobody gets confused,
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* and return a count of 0. This should result in a 0-length
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* array object when called from script.
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*/
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messageArray = (nsIConsoleMessage **)
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nsMemory::Alloc(sizeof (nsIConsoleMessage *));
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*messageArray = nsnull;
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*messages = messageArray;
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*count = 0;
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return NS_OK;
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}
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PRUint32 resultSize = mFull ? mBufferSize : mCurrent;
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messageArray =
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(nsIConsoleMessage **)nsMemory::Alloc((sizeof (nsIConsoleMessage *))
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* resultSize);
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if (messageArray == nsnull) {
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*messages = nsnull;
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*count = 0;
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return NS_ERROR_FAILURE;
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}
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PRUint32 i;
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if (mFull) {
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for (i = 0; i < mBufferSize; i++) {
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// if full, fill the buffer starting from mCurrent (which'll be
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// oldest) wrapping around the buffer to the most recent.
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messageArray[i] = mMessages[(mCurrent + i) % mBufferSize];
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NS_ADDREF(messageArray[i]);
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}
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} else {
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for (i = 0; i < mCurrent; i++) {
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messageArray[i] = mMessages[i];
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NS_ADDREF(messageArray[i]);
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}
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}
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*count = resultSize;
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*messages = messageArray;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsConsoleService::RegisterListener(nsIConsoleListener *listener) {
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nsresult rv;
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/*
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* Store a threadsafe proxy to the listener rather than the
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* listener itself; we want the console service to be callable
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* from any thread, but listeners can be implemented in
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* thread-specific ways, and we always want to call them on their
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* originating thread. JavaScript is the motivating example.
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*/
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nsCOMPtr<nsIConsoleListener> proxiedListener;
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rv = GetProxyForListener(listener, getter_AddRefs(proxiedListener));
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if (NS_FAILED(rv))
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return rv;
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{
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nsAutoLock lock(mLock);
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nsISupportsKey key(listener);
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/*
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* Put the proxy event listener into a hashtable using the *real*
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* listener as the key.
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*
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* This is necessary because proxy objects do *not* maintain
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* nsISupports identity. Therefore, since GetProxyForListener(...)
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* can return different proxies for the same object (see bug #85831)
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* we need to use the real object as the unique key...
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*/
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mListeners.Put(&key, proxiedListener);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsConsoleService::UnregisterListener(nsIConsoleListener *listener) {
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nsAutoLock lock(mLock);
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nsISupportsKey key(listener);
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mListeners.Remove(&key);
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return NS_OK;
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}
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nsresult
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nsConsoleService::GetProxyForListener(nsIConsoleListener* aListener,
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nsIConsoleListener** aProxy)
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{
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nsresult rv;
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*aProxy = nsnull;
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nsCOMPtr<nsIProxyObjectManager> proxyManager =
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(do_GetService(NS_XPCOMPROXY_CONTRACTID));
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if (proxyManager == nsnull)
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return NS_ERROR_NOT_AVAILABLE;
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/*
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* NOTE this will fail if the calling thread doesn't have an eventQ.
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*
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* Would it be better to catch that case and leave the listener unproxied?
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*/
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rv = proxyManager->GetProxyForObject(NS_CURRENT_EVENTQ,
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NS_GET_IID(nsIConsoleListener),
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aListener,
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PROXY_ASYNC | PROXY_ALWAYS,
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(void**) aProxy);
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return rv;
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}
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NS_IMETHODIMP
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nsConsoleService::Reset()
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{
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/*
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* Make sure nobody trips into the buffer while it's being reset
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*/
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nsAutoLock lock(mLock);
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mCurrent = 0;
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mFull = PR_FALSE;
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/*
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* Free all messages stored so far (cf. destructor)
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*/
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for (PRUint32 i = 0; i < mBufferSize && mMessages[i] != nsnull; i++)
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NS_RELEASE(mMessages[i]);
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return NS_OK;
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}
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