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Glassfish example source code file (CachingDynamicContentImpl.java)
The Glassfish CachingDynamicContentImpl.java source code/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common Development * and Distribution License("CDDL") (collectively, the "License"). You * may not use this file except in compliance with the License. You can * obtain a copy of the License at * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html * or packager/legal/LICENSE.txt. See the License for the specific * language governing permissions and limitations under the License. * * When distributing the software, include this License Header Notice in each * file and include the License file at packager/legal/LICENSE.txt. * * GPL Classpath Exception: * Oracle designates this particular file as subject to the "Classpath" * exception as provided by Oracle in the GPL Version 2 section of the License * file that accompanied this code. * * Modifications: * If applicable, add the following below the License Header, with the fields * enclosed by brackets [] replaced by your own identifying information: * "Portions Copyright [year] [name of copyright owner]" * * Contributor(s): * If you wish your version of this file to be governed by only the CDDL or * only the GPL Version 2, indicate your decision by adding "[Contributor] * elects to include this software in this distribution under the [CDDL or GPL * Version 2] license." If you don't indicate a single choice of license, a * recipient has the option to distribute your version of this file under * either the CDDL, the GPL Version 2 or to extend the choice of license to * its licensees as provided above. However, if you add GPL Version 2 code * and therefore, elected the GPL Version 2 license, then the option applies * only if the new code is made subject to such option by the copyright * holder. */ package org.glassfish.appclient.server.core.jws.servedcontent; import java.util.LinkedList; import java.util.Properties; import org.glassfish.appclient.server.core.jws.Util; import org.glassfish.appclient.server.core.jws.servedcontent.DynamicContent.InstanceAdapter; /** * * @author tjquinn */ /** *Represents dynamic content in template form. *<p> *This class also keeps track of the most recent times the object's template *was used to generate content that was different from the result of the *previous generation using this template. This *information is used in responding to HTTP HEAD requests. Java Web Start uses *HEAD requests to find out if a document on the server is more recent than *the locally cached copy on the client. If so, then Java Web Start will *request the updated version with a routine GET request. *<p> *To avoid incorrectly reporting obsolete cached documents as current, this *class keeps track of when the content generated by the template is different *from the previous generation. *<p> *The generated content can depend on request-time information *(such as command line arguments passed in the query string of the HTTP request). *We save and track only a few individual response instances, because the assumption *is that requests that carry query strings (which are converted into command line *arguments passed to ACC and on through to the app client) are likely to change *frequently and not necessarily be reused often. Keeping a few allows caching *the different content resulting from a small number of different argument *value settings, but avoids the problems of caching every single response *which could become a large memory drain if each request specified a *different set of arguments (for instance, one of the arguments could be a *timestamp that would change every time). */ public class CachingDynamicContentImpl extends Content.Adapter implements DynamicContent { /** maximum number of instances of content to keep for each template */ private static final int DEFAULT_MAX_INSTANCES = 4; /** *the template which will be used at runtime to create the actual response *to the HTTP request */ private final String template; /** the MIME type of the data represented by this CachingDynamicContentImpl instance */ protected final String mimeType; /** content instances resulting from previous HTTP GET requests */ private final LinkedList<Instance> instances = new LinkedList Other Glassfish examples (source code examples)Here is a short list of links related to this Glassfish CachingDynamicContentImpl.java source code file: |
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