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With inspiration from other libraries
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.core.joran.action;
import org.xml.sax.Attributes;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.hook.ShutdownHookBase;
import ch.qos.logback.core.joran.spi.ActionException;
import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.util.OptionHelper;
/**
* Action which handles elements in configuration files.
*
* @author Mike Reinhold
*/
public class ShutdownHookAction extends Action {
ShutdownHookBase hook;
private boolean inError;
/**
* Instantiates a shutdown hook of the given class and sets its name.
*
* The hook thus generated is placed in the {@link InterpretationContext}'s
* shutdown hook bag.
*/
@Override
public void begin(InterpretationContext ic, String name, Attributes attributes) throws ActionException {
hook = null;
inError = false;
String className = attributes.getValue(CLASS_ATTRIBUTE);
if (OptionHelper.isEmpty(className)) {
addError("Missing class name for shutdown hook. Near [" + name + "] line " + getLineNumber(ic));
inError = true;
return;
}
try {
addInfo("About to instantiate shutdown hook of type [" + className + "]");
hook = (ShutdownHookBase) OptionHelper.instantiateByClassName(className, ShutdownHookBase.class, context);
hook.setContext(context);
ic.pushObject(hook);
} catch (Exception e) {
inError = true;
addError("Could not create a shutdown hook of type [" + className + "].", e);
throw new ActionException(e);
}
}
/**
* Once the children elements are also parsed, now is the time to activate the
* shutdown hook options.
*/
@Override
public void end(InterpretationContext ic, String name) throws ActionException {
if (inError) {
return;
}
Object o = ic.peekObject();
if (o != hook) {
addWarn("The object at the of the stack is not the hook pushed earlier.");
} else {
ic.popObject();
Thread hookThread = new Thread(hook, "Logback shutdown hook [" + context.getName() + "]");
context.putObject(CoreConstants.SHUTDOWN_HOOK_THREAD, hookThread);
Runtime.getRuntime().addShutdownHook(hookThread);
}
}
}