gecko-dev/xpcom/base/nsIVisualEventTracer.idl

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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;
};