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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.catalina;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.catalina.core.StandardServer;
/**
* <p><strong>ServerFactory</strong> allows the registration of the
* (singleton) <code>Server</code> instance for this JVM, so that it
* can be accessed independently of any existing reference to the
* component hierarchy. This is important for administration tools
* that are built around the internal component implementation classes.
*
* @author Craig R. McClanahan
*
*/
public class ServerFactory {
// ------------------------------------------------------- Static Variables
/**
* The singleton <code>Server</code> instance for this JVM.
*/
private static final AtomicReference<Server> server = new AtomicReference<Server>();
// --------------------------------------------------------- Public Methods
/**
* Return the singleton <code>Server</code> instance for this JVM.
*/
public static Server getServer() {
return getServer(true);
}
/**
* Return the singleton <code>Server</code> instance for this JVM.
*
* @param create
* <code>true</code> to create a server if none is available and
* always return a <code>Server</code> instance,
* <code>false</code> to peek the current value and return
* <code>null</code> if no server has been created
* @return Server instance or null
*/
@SuppressWarnings("unused")
public static Server getServer(boolean create) {
Server s = server.get();
if (s == null && create) {
// Note that StandardServer() constructor calls setServer()
new StandardServer();
s = server.get();
}
return s;
}
/**
* Set the singleton <code>Server</code> instance for this JVM. This
* method must <strong>only</strong> be called from a constructor of
* the (singleton) <code>Server</code> instance that is created for
* this execution of Catalina.
*
* @param theServer The new singleton instance
*/
public static void setServer(Server theServer) {
server.compareAndSet(null, theServer);
}
/**
* Clears the singleton <code>Server</code> instance for this JVM. Allows to
* run several instances of Tomcat sequentially in the same JVM. Unit tests
* use this feature.
*/
public static void clear() {
server.set(null);
}
}
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