fish.payara.appserver.context.ContextualizerImpl Maven / Gradle / Ivy

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 *  General Public License Version 2 only ("GPL") or the Common Development
 *  and Distribution License("CDDL") (collectively, the "License").  You
 *  may not use this file except in compliance with the License.  You can
 *  obtain a copy of the License at
 *  https://github.com/payara/Payara/blob/master/LICENSE.txt
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package fish.payara.appserver.context;

import org.glassfish.internal.api.ContextProducer;
import org.glassfish.internal.api.Contextualizer;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.stream.Stream;
import javax.inject.Inject;
import org.glassfish.internal.api.JavaEEContextUtil;
import org.jvnet.hk2.annotations.Service;

/**
 *
 * @author lprimak
 */
@Service
public class ContextualizerImpl implements Contextualizer {
    @Inject
    private JavaEEContextUtil ctxUtil;

    @Override
    @SuppressWarnings("unchecked")
    public  T contextualize(T object, Class intf) {
        return contextualize(object, ctxUtil.currentInvocation(), Stream.of(intf));
    }

    @Override
    @SuppressWarnings("unchecked")
    public  T contextualize(T object, ContextProducer.Instance context, Class intf) {
        return contextualize(object, context, Stream.of(intf));
    }

    @Override
    @SuppressWarnings("unchecked")
    public  T contextualize(T object, ContextProducer.Instance context, Stream> interfaces) {
        return (T) Proxy.newProxyInstance(ctxUtil.getInvocationClassLoader(), interfaces.toArray(Class[]::new),
                new InvocationHandlerImpl(context, object));
    }

    public class InvocationHandlerImpl implements InvocationHandler {
        private final ContextProducer.Instance inv;
        private final Object delegate;
        private boolean ignore;


        private InvocationHandlerImpl(ContextProducer.Instance currentInvocation, Object delegate) {
            this.inv = currentInvocation;
            this.delegate = delegate;
        }

        @Override
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            try (ContextProducer.Context ctx = inv.pushRequestContext()) {
                if (!ignore && ctx.isValid()) {
                    return method.invoke(delegate, args);
                } else {
                    // first time the context is invalid, never run again!
                    // class loader is fixed the moment it leaks, so the
                    // subsequent calls would be with the correct class loader
                    // however delegate would be still out of date
                    ignore = true;
                    return null;
                }
            }
        }
    }
}