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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIVisualEventTracerLog;

/**
 * Interface to control the visual event tracer feature.  The result
 * is a log of various events that are monitored by a custom code
 * instrumentation around the mozilla code base.
 */

[scriptable, uuid(D51F7867-42F3-4029-8C4E-C00676253A8E)]
interface nsIVisualEventTracer : nsISupports
{
  /**
   * Start the logging now.  No affect if already started.
   * Current backlog is deleted by this call otherwise.
   *
   * @param minBacklogSeconds
   *    Manimum time to keep the backlog.  Entries of the log are discarded
   *    when their age is more then value of this argument.
   */
  void start(in unsigned long minBacklogSeconds);

  /**
   * Stop the logging now.  Backlog is kept in memory.
   */
  void stop();

  /**
   * Obtain the log.  This can be called whenever you want.
   *
   * @return
   *    Result is an object that keeps snaphot of the log from
   *    time this method has been called.  You can then access
   *    the log using the object.  Calling stop() on the tracer
   *    doesn't delete this log.
   */
  nsIVisualEventTracerLog snapshot();
};

[scriptable, uuid(52EC8962-F67C-4f49-A9D6-89B8EBDA2649)]
interface nsIVisualEventTracerLog : nsISupports
{
  /**
   * JSON string of the log.  Use JSON.parse to get it as an object.
   */
  readonly attribute ACString JSONString;
};