added Linux arm64 SDK

arm64/inspector/Base/Throttler.js

@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2019 Apple Inc. All rights reserved.
+ *
+ * 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.
+ */
+
+// Throttler wraps a function and ensures it doesn't get called more than once every `delay` ms.
+// The first fire will always trigger synchronous, and subsequent calls that need to be throttled
+// will happen later asynchronously.
+//
+// Example:
+//
+//     let throttler = new Throttler(250, () => { this.refresh() });
+//     element.addEventListener("keydown", (event) => { throttler.fire(); });
+//
+// Will ensure `refresh` happens no more than once every 250ms no matter how often `fire` is called:
+//
+//               0ms                        250ms                       500ms
+//     time:      |---------------------------|---------------------------|
+//     fire:      ^     ^ ^        ^      ^        ^    ^   ^
+//     refreshes: * (1)                       * (2)                       * (3)
+//
+// When the wrapped function is actually called, it will be given the most recent set of arguments.
+
+class Throttler
+{
+    constructor(callback, delay)
+    {
+        console.assert(typeof callback === "function");
+        console.assert(delay >= 0);
+
+        this._callback = callback;
+        this._delay = delay;
+
+        this._lastArguments = [];
+
+        this._timeoutIdentifier = undefined;
+        this._lastFireTime = -this._delay;
+    }
+
+    // Public
+
+    force()
+    {
+        this._lastArguments = arguments;
+        this._execute();
+    }
+
+    fire()
+    {
+        this._lastArguments = arguments;
+
+        let remaining = this._delay - (Date.now() - this._lastFireTime);
+        if (remaining <= 0) {
+            this._execute();
+            return;
+        }
+
+        if (this._timeoutIdentifier)
+            return;
+
+        this._timeoutIdentifier = setTimeout(() => {
+            this._execute();
+        }, remaining);
+    }
+
+    cancel()
+    {
+        this._lastArguments = [];
+
+        if (this._timeoutIdentifier) {
+            clearTimeout(this._timeoutIdentifier);
+            this._timeoutIdentifier = undefined;
+        }
+    }
+
+    // Private
+
+    _execute()
+    {
+        this._lastFireTime = Date.now();
+
+        let args = this._lastArguments;
+
+        this.cancel();
+
+        this._callback.apply(undefined, args);
+    }
+}