org.apache.struts2.dispatcher.ContainerHolder Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* 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
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*/
package org.apache.struts2.dispatcher;
import com.opensymphony.xwork2.inject.Container;
/**
* Simple class to hold Container instance per thread to minimise number of attempts
* to read configuration and build each time a new configuration.
*
* As ContainerHolder operates just per thread (which means per request) there is no need
* to check if configuration changed during the same request. If changed between requests,
* first call to store Container in ContainerHolder will be with the new configuration.
*/
class ContainerHolder {
private static ThreadLocal instance = new ThreadLocal<>();
public static void store(Container instance) {
ContainerHolder.instance.set(instance);
}
public static Container get() {
return ContainerHolder.instance.get();
}
public static void clear() {
ContainerHolder.instance.remove();
}
}