uk.org.retep.kernel.TerracottaSupport Maven / Gradle / Ivy
/*
* Copyright (c) 1998-2008, Peter T Mount
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the retep.org.uk nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
*
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package uk.org.retep.kernel;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Support class to allow Terracotta to cluster a microKernel application
*
* @author peter
*/
public class TerracottaSupport
{
private static final String MICROKERNEL_NAMESPACE = "RetepMicroKernel.";
// Class names within Terracotta
private static final String CLASSPROCESSORHELPER = "com.tc.object.bytecode.hook.impl.ClassProcessorHelper";
private static final String NAMEDCLASSLOADER = "com.tc.object.loaders.NamedClassLoader";
// Method names
private static final String REGISTERGLOBALLOADER = "registerGlobalLoader";
private static final String SETCLASSLOADERNAME = "__tc_setClassLoaderName";
// Reusable values set by init
private static Class classProcessorHelper;
private static Class namedClassLoader;
private static Method registerGlobalLoader;
private TerracottaSupport()
{
}
/**
* Initialises the support class and returns true if terracotta is available
* @return true then terracotta is present, false if not
*/
public static boolean terracottaPresent()
{
try
{
classProcessorHelper = Class.forName( CLASSPROCESSORHELPER );
namedClassLoader = Class.forName( NAMEDCLASSLOADER );
registerGlobalLoader = classProcessorHelper.getMethod(
REGISTERGLOBALLOADER,
namedClassLoader );
return true;
}
catch( Exception ex )
{
return false;
}
}
/**
* Ensure the class loader is known to Terracotta
* @param cl ClassLoader
* @param name Name for the class loader
* @throws java.lang.NoSuchMethodException thrown if Terracotta has not instrumented the ClassLoader
* @throws java.lang.IllegalAccessException if security manager is preventing access
* @throws java.lang.reflect.InvocationTargetException something terrible has happened
*/
public static void initClassLoader( final ClassLoader cl, final String name )
throws NoSuchMethodException,
IllegalAccessException,
InvocationTargetException
{
final String loaderName = new StringBuilder( MICROKERNEL_NAMESPACE ).append(
name ).toString();
// ((NamedClassLoader)cl).__tc_setClassLoaderName( loaderName );
final Class clClass = cl.getClass();
final Method setClassLoader = clClass.getMethod( SETCLASSLOADERNAME,
String.class );
setClassLoader.invoke( cl, loaderName );
// ClassProcessorHelper.registerGlobalLoader( (NamedClassLoader)cl );
registerGlobalLoader.invoke( null, cl );
}
}