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