/**
 * Copyright 2009 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import("sync");

/* performs function on an object from the cache, all within a lock */
function syncedWithCache(name, fn) {
  return sync.doWithStringLock("cache/"+name, function() {
    var parts = name.split(".");
    var obj = appjet.cache;
    for (var i = 0; i < parts.length; i++) {
      var p = parts[i];
      if (!obj[p]) {
        obj[p] = {};
      }
      obj = obj[p];
    }
    return fn(obj);
  });
}