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/*
 * Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
//     06/30/2010-2.1.1 Michael O'Brien
//       - 316513: Enable JMX MBean functionality for JBoss, Glassfish and WebSphere in addition to WebLogic
//       Move JMX MBean generic registration code up from specific platforms
//       see http://wiki.eclipse.org/EclipseLink/DesignDocs/316513
//     12/18/2014-2.6 Rick Curtis
//       455690: Move JNDIConnector lookup type to ServerPlatform.
package org.eclipse.persistence.platform.server.was;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.Connection;

import org.eclipse.persistence.internal.security.PrivilegedAccessHelper;
import org.eclipse.persistence.logging.SessionLog;
import org.eclipse.persistence.platform.server.JMXServerPlatformBase;
import org.eclipse.persistence.sessions.DatabaseSession;
import org.eclipse.persistence.sessions.JNDIConnector;
import org.eclipse.persistence.transaction.was.WebSphereTransactionController;

/**
 * PUBLIC:
 *
 * This is the concrete subclass responsible for representing WebSphere-specific server behavior.
 *
 * This platform has:
 * 
 *  WebSphereTransactionController (JTA integration).
 * 
 DataSource connection unwrapping (Oracle JDBC API support)
 * 
 */
public class WebSpherePlatform extends JMXServerPlatformBase {

    /**
     * Cached WAS connection class used to reflectively check connections and unwrap them.
     */
    protected Class websphereConnectionClass;

    /**
     * Cached WAS util class used to reflectively check connections and unwrap them.
     */
    protected Class websphereUtilClass;

    /**
     * Cached WAS util method used for unwrapping connections.
     */
    protected Method vendorConnectionMethod;

    /**
     * INTERNAL:
     * Default Constructor: All behavior for the default constructor is inherited
     */
    public WebSpherePlatform(DatabaseSession newDatabaseSession) {
        super(newDatabaseSession);
        this.disableRuntimeServices();
    }

    /**
     * INTERNAL: getExternalTransactionControllerClass(): Answer the class of
     * external transaction controller to use for WebSphere. This is
     * read-only.
     *
     * @return Class externalTransactionControllerClass
     *
     * @see org.eclipse.persistence.transaction.JTATransactionController
     * @see org.eclipse.persistence.platform.server.ServerPlatformBase#isJTAEnabled()
     * @see org.eclipse.persistence.platform.server.ServerPlatformBase#disableJTA()
     * @see org.eclipse.persistence.platform.server.ServerPlatformBase#initializeExternalTransactionController()
     */
    public Class getExternalTransactionControllerClass() {
        if (externalTransactionControllerClass == null){
            externalTransactionControllerClass = WebSphereTransactionController.class;
        }
        return externalTransactionControllerClass;
    }


    /**
     * Return the class (interface) for the WebSphere JDBC connection wrapper.
     */
    protected Class getWebsphereUtilClass() {
        if (this.websphereUtilClass == null) {
            try {
                this.websphereUtilClass = (Class) getDatabaseSession().getPlatform().convertObject("com.ibm.ws.rsadapter.jdbc.WSJdbcUtil", Class.class);
            } catch (Throwable exception) {
                getDatabaseSession().getSessionLog().logThrowable(SessionLog.WARNING, SessionLog.SERVER, exception);
                this.websphereUtilClass = void.class;
            }
        }
        return this.websphereUtilClass;
    }

    /**
     * Return the class (interface) for the WebSphere JDBC connection wrapper.
     */
    protected Class getWebsphereConnectionClass() {
        if (this.websphereConnectionClass == null) {
            try {
                this.websphereConnectionClass = (Class) getDatabaseSession().getPlatform().convertObject("com.ibm.ws.rsadapter.jdbc.WSJdbcConnection", Class.class);
            } catch (Throwable exception) {
                getDatabaseSession().getSessionLog().logThrowable(SessionLog.WARNING, SessionLog.SERVER, exception);
                this.websphereConnectionClass = void.class;
            }
        }
        return this.websphereConnectionClass;
    }

    /**
     * Return the method for the WebSphere JDBC connection wrapper vendorConnection.
     */
    protected Method getVendorConnectionMethod() {
        if ((this.vendorConnectionMethod == null) && (!getWebsphereUtilClass().equals(void.class))) {
            try {
                Class args[] = new Class[1];
                args[0] = getWebsphereConnectionClass();
                this.vendorConnectionMethod = PrivilegedAccessHelper.getDeclaredMethod(getWebsphereUtilClass(), "getNativeConnection", args);
            } catch (NoSuchMethodException exception) {
                getDatabaseSession().getSessionLog().logThrowable(SessionLog.WARNING, SessionLog.SERVER, exception);
            }
        }

        return this.vendorConnectionMethod;
    }

    /**
     * Unwraps the WebSphere JDBC connection wrapping using the WebLogic API reflectively.
     */
    @Override
    public Connection unwrapConnection(Connection connection) {
        if (getWebsphereConnectionClass().isInstance(connection) && getVendorConnectionMethod() != null) {
            try {
                return (Connection) PrivilegedAccessHelper.invokeMethod(getVendorConnectionMethod(), null, new Object[]{connection});
            } catch (IllegalAccessException exception) {
                getDatabaseSession().getSessionLog().logThrowable(SessionLog.WARNING, SessionLog.SERVER, exception);
            } catch (InvocationTargetException exception) {
                getDatabaseSession().getSessionLog().logThrowable(SessionLog.WARNING, SessionLog.SERVER, exception);
            }
        }

        return super.unwrapConnection(connection);
    }

    @Override
    public int getJNDIConnectorLookupType() {
        return JNDIConnector.STRING_LOOKUP;
    }
}