Glassfish example source code file (GFSystem.java)

This example Glassfish source code file (GFSystem.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

gfsystem, gfsystemimpl, gfsystemimpl, inheritablethreadlocal, inheritablethreadlocal, map, map, override, string, string, util

The Glassfish GFSystem.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2008-2010 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:
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 */

package com.sun.enterprise.universal.glassfish;

import com.sun.enterprise.universal.collections.CollectionUtils;
import java.util.*;

/**
 * A replacement for System Properties
 * An InheritableThreadLocal is used to store the "impl".  This means that the
 * initial thread that uses this class -- and all its sub-threads will get the
 * same System Properties.
 * Make sure that you don't create it from the main Thread -- otherwise all instances
 * will get the same props.
 * E.g.
 * main thread creates instance1-thread and instance2-thread
 * The 2 created threads should each call init() -- but the main thread should not.
 * In the usual case where there is just one instance in the JVM -- this class is also
 * perfectly usable.  Just call any method when you need something.
 * 
 * @author bnevins
 */
public final class GFSystem {
    public final static void init() {
        // forces creation
        getProperty("java.lang.separator");
    }
    
    /**
     * Get the GFSystem Properties
     * @return a snapshot copy of the dcurrent Properties
     */
    public final static Map<String,String> getProperties()
    {
        return gfsi.get().getProperties();
    }
    
    /**
     * Get a GF System Property
     * @param key the name of the property
     * @return the value of the property
     */
    public final static String getProperty(String key)
    {
        return gfsi.get().getProperty(key);
    }

    /**
     * Set a GF System Property, null is acceptable for the name and/or value.
     * @param key the name of the property
     * @param value the value of the property
     */
    public final static void setProperty(String key, String value)
    {
        gfsi.get().setProperty(key, value);
    }
    
    private static final InheritableThreadLocal<GFSystemImpl> gfsi = 
         new InheritableThreadLocal<GFSystemImpl>() {
             @Override 
             protected GFSystemImpl initialValue() {
                 return new GFSystemImpl();
         }
     };
}