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();
 
        synchronized (this) {
            int numberOfTries = 2;
            while (numberOfTries > 0) {
                Connection _conn = getConnection();
                if (_conn == null) {
                    return (null);
                }


                try {
                    if (preparedLoadSql == null) {
                        String loadSql = "SELECT " + sessionIdCol + ", "
                                + sessionDataCol + " FROM " + sessionTable
                                + " WHERE " + sessionIdCol + " = ? AND "
                                + sessionAppCol + " = ?";
                        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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            return;
        if (log.isDebugEnabled())
            log.debug(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 (log.isDebugEnabled())
                    log.debug("Creating custom object input stream for class loader ");
                ois = new CustomObjectInputStream(bis, classLoader);
            } else {

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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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            if (!docBase.exists()) {
                docBase.mkdirs();
            }
            context.setDocBase(docBase.getPath());


            final Loader loader = new WebCtxLoader(classloader);
            loader.setContainer(host);
            context.setLoader(loader);
            context.setInstanceManager(new LocalInstanceManager());


            final int j = servletClass.indexOf(".");
            final String servletName = j < 0 ? servletClass : servletClass.substring(j + 1);

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            if (!docBase.exists()) {
                docBase.mkdirs();
            }
            context.setDocBase(docBase.getPath());


            final Loader loader = new WebCtxLoader(unit.getAttachment(WSAttachmentKeys.CLASSLOADER_KEY));
            loader.setContainer(host);
            context.setLoader(loader);
            context.setInstanceManager(new LocalInstanceManager());


            addServlets(jbwebMD, context);

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            try {
                context.setPath("");
                context.addLifecycleListener(new ContextConfig());
                context.setDocBase(pathInjector.getValue() + File.separatorChar + "welcome-content");


                final Loader loader = new WebCtxLoader(this.getClass().getClassLoader());
                Host host = hostInjector.getValue().getHost();
                loader.setContainer(host);
                context.setLoader(loader);
                context.setInstanceManager(new LocalInstanceManager(httpManagement));


                context.setReplaceWelcomeFiles(true);
                if (httpManagement != null) {

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      StandardContext context = (StandardContext)Class.forName(config.getContextClassName()).newInstance();


      DeploymentUnit depUnit = webApp.getDeploymentUnit();
      TomcatInjectionContainer injectionContainer = new TomcatInjectionContainer(webApp, depUnit, context, getPersistenceUnitDependencyResolver());


      Loader webLoader = depUnit.getAttachment(Loader.class);
      if (webLoader == null)
         webLoader = getWebLoader(depUnit, metaData, loader, warUrl, injectionContainer);


      webApp.setName(warUrl.getPath());
      webApp.setClassLoader(loader);

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   }


   public Loader getWebLoader(DeploymentUnit unit, JBossWebMetaData metaData, ClassLoader loader, URL rl, TomcatInjectionContainer injectionContainer) throws MalformedURLException
   {
      Loader webLoader;
      
      /*
       * If we are using the jboss class loader we need to augment its path to include the WEB-INF/{lib,classes} dirs or
       * else scoped class loading does not see the war level overrides. The call to setWarURL adds these paths to the
       * deployment UCL.

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                    injectionContainer.addInstantiator(entry.getKey(), entry.getValue());
                }
            }
        }


        final Loader loader = new WebCtxLoader(classLoader);
        webContext.setLoader(loader);


        // Valves
        List<ValveMetaData> valves = metaData.getValves();
        if (valves == null) {

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                             id, file.getAbsolutePath()));
        }


        FileInputStream fis = null;
        ObjectInputStream ois = null;
        Loader loader = null;
        ClassLoader classLoader = null;
        try {
            fis = new FileInputStream(file.getAbsolutePath());
            BufferedInputStream bis = new BufferedInputStream(fis);
            Container container = manager.getContainer();
            if (container != null)
                loader = container.getLoader();
            if (loader != null)
                classLoader = loader.getClassLoader();
            if (classLoader != null)
                ois = new CustomObjectInputStream(bis, classLoader);
            else
                ois = new ObjectInputStream(bis);
        } catch (FileNotFoundException e) {

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