webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 78 insertions, 0 deletions

diff --git a/Source/WebInspectorUI/UserInterface/Protocol/MessageDispatcher.js b/Source/WebInspectorUI/UserInterface/Protocol/MessageDispatcher.js
new file mode 100644
index 000000000..807f7cfd3
--- /dev/null
+++ b/Source/WebInspectorUI/UserInterface/Protocol/MessageDispatcher.js
@@ -0,0 +1,78 @@
+/*
+ * 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.
+ */
+
+WebInspector._messagesToDispatch = [];
+
+WebInspector.dispatchNextQueuedMessageFromBackend = function()
+{
+    const startCount = WebInspector._messagesToDispatch.length;
+    const startTimestamp = timestamp();
+    const timeLimitPerRunLoop = 10; // milliseconds
+
+    let i = 0;
+    for (; i < WebInspector._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 (timestamp() - startTimestamp > timeLimitPerRunLoop)
+            break;
+
+        InspectorBackend.dispatch(WebInspector._messagesToDispatch[i]);
+    }
+
+    if (i === WebInspector._messagesToDispatch.length) {
+        WebInspector._messagesToDispatch = [];
+        WebInspector._dispatchTimeout = null;
+    } else {
+        WebInspector._messagesToDispatch = WebInspector._messagesToDispatch.slice(i);
+        WebInspector._dispatchTimeout = setTimeout(WebInspector.dispatchNextQueuedMessageFromBackend, 0);
+    }
+
+    if (InspectorBackend.dumpInspectorTimeStats) {
+        let messageDuration = (timestamp() - startTimestamp).toFixed(3);
+        let dispatchedCount = startCount - WebInspector._messagesToDispatch.length;
+        let remainingCount = WebInspector._messagesToDispatch.length;
+        console.log(`time-stats: --- RunLoop duration: ${messageDuration}ms; dispatched: ${dispatchedCount}; remaining: ${remainingCount}`);
+    }
+};
+
+WebInspector.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);
+};