/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * 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
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 * the provisions above, a recipient may use your version of this file under
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 * ***** END LICENSE BLOCK ***** */

/*
 * nsConsoleService class declaration.
 */

#ifndef __nsconsoleservice_h__
#define __nsconsoleservice_h__

#include "mozilla/Attributes.h"
#include "mozilla/Mutex.h"

#include "nsCOMPtr.h"
#include "nsInterfaceHashtable.h"
#include "nsHashKeys.h"

#include "nsIConsoleService.h"

class nsConsoleService MOZ_FINAL : public nsIConsoleService
{
public:
    nsConsoleService();
    nsresult Init();

    NS_DECL_ISUPPORTS
    NS_DECL_NSICONSOLESERVICE

    void SetIsDelivering() {
        MOZ_ASSERT(NS_IsMainThread());
        MOZ_ASSERT(!mDeliveringMessage);
        mDeliveringMessage = true;
    }

    void SetDoneDelivering() {
        MOZ_ASSERT(NS_IsMainThread());
        MOZ_ASSERT(mDeliveringMessage);
        mDeliveringMessage = false;
    }

private:
    ~nsConsoleService();

    // Circular buffer of saved messages
    nsIConsoleMessage **mMessages;

    // How big?
    PRUint32 mBufferSize;

    // Index of slot in mMessages that'll be filled by *next* log message
    PRUint32 mCurrent;

    // Is the buffer full? (Has mCurrent wrapped around at least once?)
    bool mFull;

    // Are we currently delivering a console message on the main thread? If
    // so, we suppress incoming messages on the main thread only, to avoid
    // infinite repitition.
    bool mDeliveringMessage;

    // Listeners to notify whenever a new message is logged.
    nsInterfaceHashtable<nsISupportsHashKey, nsIConsoleListener> mListeners;

    // To serialize interesting methods.
    mozilla::Mutex mLock;
};

#endif /* __nsconsoleservice_h__ */