com.sun.enterprise.universal.glassfish.GFSystem Maven / Gradle / Ivy
/*
* Copyright (c) 2008, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
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 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 gfsi =
new InheritableThreadLocal() {
@Override
protected GFSystemImpl initialValue() {
return new GFSystemImpl();
}
};
}