Glassfish example source code file (ProviderContainerContractInfoImpl.java)

This example Glassfish source code file (ProviderContainerContractInfoImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

accclassloader, bean, classloader, classloader, classtransformer, collection, collection, entitymanagerfactory, instrumentation, javabean, net, network, providercontainercontractinfobase, providercontainercontractinfoimpl, security, string, string, transformerwrapper, transformerwrapper, util

The Glassfish ProviderContainerContractInfoImpl.java source code

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 * 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://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * file and include the License file at packager/legal/LICENSE.txt.
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package org.glassfish.appclient.client.acc;

import com.sun.appserv.connectors.internal.api.ConnectorRuntime;
import com.sun.enterprise.deployment.RootDeploymentDescriptor;
import java.beans.PropertyChangeListener;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.net.URLClassLoader;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import javax.persistence.EntityManagerFactory;
import javax.persistence.spi.ClassTransformer;
import javax.validation.ValidatorFactory;

import org.glassfish.api.deployment.DeploymentContext;
import org.glassfish.persistence.jpa.ProviderContainerContractInfoBase;

/**
 * Implements the internal GlassFish interface which all persistence provider
 * containers must.
 *
 * @author tjquinn
 */
public class ProviderContainerContractInfoImpl extends ProviderContainerContractInfoBase {

    private final ACCClassLoader classLoader;
    private final Instrumentation inst;
    private final String applicationLocation;

    private final List<PropertyChangeListener> transformerAdditionListeners =
            new ArrayList<PropertyChangeListener>();

    private final Collection<EntityManagerFactory> emfs = new HashSet();
    /**
     * Creates a new instance of the ACC's implementation of the contract.
     * The ACC uses its agent to register a VM transformer which can then
     * delegate to transformers registered with this class by the
     * persistence logic.
     *
     * @param classLoader ACC's class loader
     * @param inst VM's instrumentation object
     */
    public ProviderContainerContractInfoImpl(
            final ACCClassLoader classLoader,
            final Instrumentation inst,
            final String applicationLocation,
            final ConnectorRuntime connectorRuntime) {
        super(connectorRuntime);
        this.classLoader = classLoader;
        this.inst = inst;
        this.applicationLocation = applicationLocation;
    }

    public ClassLoader getClassLoader() {
        return classLoader;
    }

    public ClassLoader getTempClassloader() {
        return new URLClassLoader(classLoader.getURLs());
    }

    public void addTransformer(ClassTransformer transformer) {
        final TransformerWrapper tw = new TransformerWrapper(transformer, classLoader);
        if (inst != null) {
            inst.addTransformer(tw);
        } else {
            classLoader.addTransformer(tw);
        }
    }

    public String getApplicationLocation() {
        return applicationLocation;
    }

    public ValidatorFactory getValidatorFactory() {
        // TODO: Need to implement this correctly.
        return null;
    }

    // TODO: remove after persistence is refactored.
    public DeploymentContext getDeploymentContext() {
        return null;
    }

    public boolean isJava2DBRequired() {
        // Returns whether Java2DB is required or not. For an AppClient it is always false
        return false;
    }

    public void registerEMF(String unitName, String persistenceRootUri, RootDeploymentDescriptor containingBundle, EntityManagerFactory emf) {
        emfs.add(emf);
    }

    public String getJTADataSourceOverride() {
        // Returns whether JTA datasource is overridden. For an appclient it is never the case.
        return null;
    }

    public Collection<EntityManagerFactory> emfs() {
        return emfs;
    }

    /**
     * Wraps a persistence transformer in a java.lang.instrumentation.ClassFileTransformer
     * suitable for addition as a transformer to the JVM-provided instrumentation
     * class.
     */
    public static class TransformerWrapper implements ClassFileTransformer {

        private final ClassTransformer persistenceTransformer;
        private final ClassLoader classLoader;

        TransformerWrapper(final ClassTransformer persistenceTransformer,
                final ClassLoader classLoader) {
            this.persistenceTransformer = persistenceTransformer;
            this.classLoader = classLoader;
        }

        public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
            /*
             * Do not even bother running the transformer unless the loader
             * loading the class is the ACC's class loader.
             */
            return (loader.equals(classLoader) ?
                persistenceTransformer.transform(loader, className,
                    classBeingRedefined, protectionDomain, classfileBuffer)
                : null);
        }
    }

}