1/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 * Copyright (C) 2014 University of Washington
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
16 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
24 * THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27WebInspector.messagesToDispatch = [];
28
29WebInspector.dispatchNextQueuedMessageFromBackend = function()
30{
31    var startCount = WebInspector.messagesToDispatch.length;
32    var startTime = Date.now();
33    var timeLimitPerRunLoop = 10; // milliseconds
34
35    var i = 0;
36    for (; i < WebInspector.messagesToDispatch.length; ++i) {
37        // Defer remaining messages if we have taken too long. In practice, single
38        // messages like Page.getResourceContent blow through the time budget.
39        if (Date.now() - startTime > timeLimitPerRunLoop)
40            break;
41
42        InspectorBackend.dispatch(WebInspector.messagesToDispatch[i]);
43    }
44
45    if (i === WebInspector.messagesToDispatch.length) {
46        WebInspector.messagesToDispatch = [];
47        WebInspector._dispatchTimeout = null;
48    } else {
49        WebInspector.messagesToDispatch = WebInspector.messagesToDispatch.slice(i);
50        WebInspector._dispatchTimeout = setTimeout(WebInspector.dispatchNextQueuedMessageFromBackend, 0);
51    }
52
53    if (InspectorBackend.dumpInspectorTimeStats)
54        console.log("time-stats: --- RunLoop duration: " + (Date.now() - startTime) + "ms; dispatched: " + (startCount - WebInspector.messagesToDispatch.length) + "; remaining: " + WebInspector.messagesToDispatch.length);
55}
56
57WebInspector.dispatchMessageFromBackend = function(message)
58{
59    // Enforce asynchronous interaction between the backend and the frontend by queueing messages.
60    // The messages are dequeued on a zero delay timeout.
61
62    this.messagesToDispatch.push(message);
63
64    if (this._dispatchTimeout)
65        return;
66
67    this._dispatchTimeout = setTimeout(WebInspector.dispatchNextQueuedMessageFromBackend, 0);
68}
69