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Tools/GardeningServer/scripts/base.js

-/*
- * Copyright (C) 2011 Google 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.
- */
-
-var base = base || {};
-
-(function(){
-
-// This is effectively a cache of possibly-resolved promises.
-base.AsynchronousCache = function(fetch)
-{
-    this._fetch = fetch;
-    this._promiseCache = {};
-};
-
-base.AsynchronousCache._sentinel = new Object();
-base.AsynchronousCache.prototype.get = function(key)
-{
-    if (!(key in this._promiseCache)) {
-        this._promiseCache[key] = base.AsynchronousCache._sentinel;
-        this._promiseCache[key] = this._fetch.call(null, key);
-    }
-    if (this._promiseCache[key] === base.AsynchronousCache._sentinel)
-        return Promise.reject(Error("Reentrant request for ", key));
-
-    return this._promiseCache[key];
-};
-
-base.AsynchronousCache.prototype.clear = function()
-{
-    this._promiseCache = {};
-};
-
-})();