com.sun.faces.scripting.WeldAwareGroovySupportFilter Maven / Gradle / Ivy
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package com.sun.faces.scripting;
import com.sun.faces.scripting.groovy.GroovyHelper;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.FilterChain;
import javax.servlet.ServletContext;
class WeldAwareGroovySupportFilter implements Filter {
private boolean helperChecked;
private GroovyHelper helper;
private ServletContext sc;
private Class containerClass;
private Field instanceField;
private Method instanceMethod;
private Class singletonClass;
private Method singletonSetMethod;
public void init(FilterConfig filterConfig) throws ServletException {
sc = filterConfig.getServletContext();
try {
obtainReflectionReferences();
} catch (Exception ex) {
throw new ServletException(ex);
}
}
private void obtainReflectionReferences() throws Exception {
ClassLoader tccl = Thread.currentThread().getContextClassLoader();
containerClass = tccl.loadClass("org.jboss.weld.Container");
instanceField = containerClass.getDeclaredField("instance");
instanceField.setAccessible(true);
Class [] paramTypes = new Class[0];
instanceMethod = containerClass.getDeclaredMethod("instance", paramTypes);
instanceMethod.setAccessible(true);
singletonClass = tccl.loadClass("org.jboss.weld.bootstrap.api.Singleton");
paramTypes = new Class[1];
paramTypes[0] = Object.class;
singletonSetMethod = singletonClass.getDeclaredMethod("set", paramTypes);
}
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse,
FilterChain filterChain)
throws IOException, ServletException {
if (!helperChecked) {
helper = GroovyHelper.getCurrentInstance(sc);
// if null at this point, it will be null for the remainder
// of the app. Set a flag so that we don't continually hit
// the ServletContext looking up the helper.
helperChecked = true;
}
if (helper != null) {
// Get the "real" ContextClassLoader
Thread currentThread = Thread.currentThread();
ClassLoader contextClassLoader = currentThread.getContextClassLoader();
// Get the MojarraGroovyClassLoader
helper.setClassLoader();
ClassLoader mojarraGroovyClassLoader = currentThread.getContextClassLoader();
// Set the ContextClassLoader back
currentThread.setContextClassLoader(contextClassLoader);
// Obtain the Container
Object c = null;
try {
c = getWeldContainerInstance();
} catch (Exception ex) {
Logger.getLogger(WeldAwareGroovySupportFilter.class.getName()).log(Level.SEVERE, null, ex);
}
// Set the MojarraGroovyClassLoader back
currentThread.setContextClassLoader(mojarraGroovyClassLoader);
try {
installMojarraGroovyClassLoaderToContainer(c);
} catch (Exception ex) {
Logger.getLogger(WeldAwareGroovySupportFilter.class.getName()).log(Level.SEVERE, null, ex);
}
// Re-install the MojarraGroovyClassLoader
helper.setClassLoader();
}
filterChain.doFilter(servletRequest, servletResponse);
}
private Object getWeldContainerInstance() throws Exception {
Object [] args = new Object[0];
Object result = instanceMethod.invoke(null, args);
return result;
}
private void installMojarraGroovyClassLoaderToContainer(Object c) throws NoSuchFieldException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
Object aclSingletonProvider = instanceField.get(null);
singletonSetMethod.invoke(aclSingletonProvider, c);
}
public void destroy() {
// no-op
}
}