Examples of org.apache.catalina.Loader

org.apache.catalina.Loader
A Loader represents a Java ClassLoader implementation that can be used by a Container to load class files (within a repository associated with the Loader) that are designed to be reloaded upon request, as well as a mechanism to detect whether changes have occurred in the underlying repository.
In order for a Loader implementation to successfully operate with a Context implementation that implements reloading, it must obey the following constraints:
- Must implement Lifecycle so that the Context can indicate that a new class loader is required.
- The start() method must unconditionally create a new ClassLoader implementation.
- The stop() method must throw away its reference to the ClassLoader previously utilized, so that the class loader, all classes loaded by it, and all objects of those classes, can be garbage collected.
- Must allow a call to stop() to be followed by a call to start() on the same Loader instance.
- Based on a policy chosen by the implementation, must call the Context.reload() method on the owning Context when a change to one or more of the class files loaded by this class loader is detected.
@author Craig R. McClanahan @version $Revision: 1433 $ $Date: 2010-04-09 00:33:40 +0200 (Fri, 09 Apr 2010) $

     */
    public Session load(String id)
        throws ClassNotFoundException, IOException {
        ResultSet rst = null;
        StandardSession _session = null;
        Loader loader = null;
        ClassLoader classLoader = null;
        ObjectInputStream ois = null;
        BufferedInputStream bis = null;
        Container container = manager.getContainer();
        String loadSql =
            "SELECT " + sessionIdCol + ", " + sessionDataCol + " FROM " +
            sessionTable + " WHERE " + sessionIdCol + " = ? AND " +
            sessionAppCol + " = ?";


        synchronized(this) {
            Connection _conn = getConnection();
            if(_conn == null) {
                return(null);
            }


            try {
                if(preparedLoadSql == null) {
                    preparedLoadSql = _conn.prepareStatement(loadSql);
                }


                preparedLoadSql.setString(1, id);
                preparedLoadSql.setString(2, getName());
                rst = preparedLoadSql.executeQuery();
                if (rst.next()) {
                    bis = new BufferedInputStream(rst.getBinaryStream(2));


                    if (container != null) {
                        loader = container.getLoader();
                    }
                    if (loader != null) {
                        classLoader = loader.getClassLoader();
                    }
                    if (classLoader != null) {
                        ois = new CustomObjectInputStream(bis,
                                                          classLoader);
                    } else {

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     */
    public void processClusterReceiver() {
        Object[] objs = clusterReceiver.getObjects();
        StandardSession _session = null;
        ByteArrayInputStream bis = null;
        Loader loader = null;
        ClassLoader classLoader = null;
        ObjectInputStream ois = null;
        byte[] buf = new byte[5000];
        ReplicationWrapper repObj = null;


        for(int i=0; i < objs.length;i++) {
            try {
                bis = new ByteArrayInputStream(buf);
                repObj = (ReplicationWrapper)objs[i];
                buf = repObj.getDataStream();
                bis = new ByteArrayInputStream(buf, 0, buf.length);


                if (container != null)
                    loader = container.getLoader();


                if (loader != null)
                    classLoader = loader.getClassLoader();


                if (classLoader != null)
                    ois = new CustomObjectInputStream(bis,
                                                      classLoader);
                else

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            return;
        if (debug >= 1)
            log(sm.getString("standardManager.loading", pathname));
        FileInputStream fis = null;
        ObjectInputStream ois = null;
        Loader loader = null;
        ClassLoader classLoader = null;
        try {
            fis = new FileInputStream(file.getAbsolutePath());
            BufferedInputStream bis = new BufferedInputStream(fis);
            if (container != null)
                loader = container.getLoader();
            if (loader != null)
                classLoader = loader.getClassLoader();
            if (classLoader != null) {
                if (debug >= 1)
                    log("Creating custom object input stream for class loader "
                        + classLoader);
                ois = new CustomObjectInputStream(bis, classLoader);

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                throw new ServletException
                    (sm.getString("standardWrapper.notClass", getName()));
            }
    
            // Acquire an instance of the class loader to be used
            Loader loader = getLoader();
            if (loader == null) {
                unavailable(null);
                throw new ServletException
                    (sm.getString("standardWrapper.missingLoader", getName()));
            }
    
            ClassLoader classLoader = loader.getClassLoader();
    
            // Special case class loader for a container provided servlet
            if (isContainerProvidedServlet(actualClass)) {
                classLoader = this.getClass().getClassLoader();
                log(sm.getString

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     * @param loader The newly associated loader
     */
    public synchronized void setLoader(Loader loader) {


        // Change components if necessary
        Loader oldLoader = this.loader;
        if (oldLoader == loader)
            return;
        this.loader = loader;


        // Stop the old component if necessary

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     * Set the Loader with which this Context is associated.
     *
     * @param loader The newly associated loader
     */
    public void setLoader(Loader loader) {
        Loader oldLoader = this.loader;
        this.loader = loader;
        
        if (loader != null) {
            loader.setDefaultContext(this);
        }

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            Class clazz = loader.getClass();
            Class types[] = { ClassLoader.class };
            Object args[] = { parentClassLoader };
            try {
                Constructor constructor = clazz.getDeclaredConstructor(types);
                Loader context_loader = (Loader) constructor.newInstance(args);
                context_loader.setDelegate(loader.getDelegate());
                context_loader.setReloadable(loader.getReloadable());
                if (loader instanceof WebappLoader) {
                    ((WebappLoader)context_loader).setCheckInterval
                        (((WebappLoader)loader).getCheckInterval());
                    ((WebappLoader)context_loader).setDebug
                        (((WebappLoader)loader).getDebug());

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                (Globals.MBEAN_SERVER_ATTR, 
                 MBeanUtils.createServer());
        }


        // Create the MBeans for the associated nested components
        Loader cLoader = context.getLoader();
        if (cLoader != null) {
            if (debug >= 4)
                log("Creating MBean for Loader " + cLoader);
            MBeanUtils.createMBean(cLoader);
        }

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            log("Creating MBean for DefaultContext " + dcontext);
        MBeanUtils.createMBean(dcontext);
        dcontext.addPropertyChangeListener(this);
        
        // Create the MBeans for the associated nested components
        Loader dLoader = dcontext.getLoader();
        if (dLoader != null) {
            if (debug >= 4)
                log("Creating MBean for Loader " + dLoader);
            MBeanUtils.createMBean(dLoader);
        }

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        if ((cLogger != null) && (cLogger != hLogger)) {
            if (debug >= 4)
                log("Destroying MBean for Logger " + cLogger);
            MBeanUtils.destroyMBean(cLogger);
        }
        Loader cLoader = context.getLoader();
        if (cLoader != null) {
            if (debug >= 4)
                log("Destroying MBean for Loader " + cLoader);
            MBeanUtils.destroyMBean(cLoader);
        }

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