root / src / pithos / content / cache.js @ 46:f16f6e0e5b69
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// The Pithos File Manager Firefox Extension is funded by GRNET S.A.
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// (http://www.grnet.gr)
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//
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// Copyright (c) 2009, Christos KK Loverdos, Vassilios Karakoidas.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// - Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// - Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// - Neither the name of GRNET S.A. nor the names of its contributors
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// may be used to endorse or promote products derived from this
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// software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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cache = null;
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// Directory caching
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function FileCache() { |
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// public properties
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// private properties
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var cacheMap = new Array(); |
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var cacheExpired = new Array(); |
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var cacheExceptions = new Array(); |
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var expiration = 60000; // 1 minute for expiration of data |
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// public methods
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this.add = function(key, obj) { |
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if ( cacheExceptions.indexOf(key) >= 0) { |
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return;
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} |
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var d = new Date(); |
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cacheMap[key] = obj; |
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cacheExpired[key] = d.getTime(); |
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} |
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this.remove = function(key) { |
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cacheMap[key] = undefined;
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cacheExpired[key] = 0;
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} |
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this.get = function(key) { |
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var d = new Date(); |
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var e = cacheExpired[key];
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// the key should exist in the cacheExpired map
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if (e == undefined) { return undefined; } |
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// if the data are expired
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if (((d.getTime() - e) > expiration) || (e == 0)) { |
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cacheMap[key] = undefined;
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cacheExpired[key] = 0;
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return undefined; |
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} |
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return cacheMap[key];
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} |
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// private methods
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// initialisation
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// never cache shared and others
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cacheExceptions.push(connection_obj.user_homepage().shared); |
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cacheExceptions.push(connection_obj.user_homepage().others); |
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cacheExceptions.push(connection_obj.user_homepage().trash); |
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} |