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/*
* Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
* Copyright (C) 2014 University of Washington
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
WI._messagesToDispatch = [];
WI.dispatchNextQueuedMessageFromBackend = function()
{
const startCount = WI._messagesToDispatch.length;
const startTimestamp = performance.now();
const timeLimitPerRunLoop = 10; // milliseconds
let i = 0;
for (; i < WI._messagesToDispatch.length; ++i) {
// Defer remaining messages if we have taken too long. In practice, single
// messages like Page.getResourceContent blow through the time budget.
if (performance.now() - startTimestamp > timeLimitPerRunLoop)
break;
InspectorBackend.dispatch(WI._messagesToDispatch[i]);
}
if (i === WI._messagesToDispatch.length) {
WI._messagesToDispatch = [];
WI._dispatchTimeout = null;
} else {
WI._messagesToDispatch = WI._messagesToDispatch.slice(i);
WI._dispatchTimeout = setTimeout(WI.dispatchNextQueuedMessageFromBackend, 0);
}
if (InspectorBackend.dumpInspectorTimeStats) {
let messageDuration = (performance.now() - startTimestamp).toFixed(3);
let dispatchedCount = startCount - WI._messagesToDispatch.length;
let remainingCount = WI._messagesToDispatch.length;
console.log(`time-stats: --- RunLoop duration: ${messageDuration}ms; dispatched: ${dispatchedCount}; remaining: ${remainingCount}`);
}
};
WI.dispatchMessageFromBackend = function(message)
{
// Enforce asynchronous interaction between the backend and the frontend by queueing messages.
// The messages are dequeued on a zero delay timeout.
this._messagesToDispatch.push(message);
// If something has gone wrong and the uncaught exception sheet is showing,
// then don't try to dispatch more messages. Dispatching causes spurious uncaught
// exceptions and cause the sheet to overflow with hundreds of logged exceptions.
if (window.__uncaughtExceptions && window.__uncaughtExceptions.length)
return;
if (this._dispatchTimeout)
return;
this._dispatchTimeout = setTimeout(this.dispatchNextQueuedMessageFromBackend, 0);
};
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