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) $

        protected void processChildren(Container container) {
            ClassLoader originalClassLoader = null;


            try {
                if (container instanceof Context) {
                    Loader loader = ((Context) container).getLoader();
                    // Loader will be null for FailedContext instances
                    if (loader == null) {
                        return;
                    }
                    // Ensure background processing for Contexts and Wrappers
                    // is performed under the web app's class loader
                    originalClassLoader =
                            Thread.currentThread().getContextClassLoader();
                    Thread.currentThread().setContextClassLoader(
                            loader.getClassLoader());
                }
                container.backgroundProcess();
                Container[] children = container.findChildren();
                for (int i = 0; i < children.length; i++) {
                    if (children[i].getBackgroundProcessorDelay() <= 0) {

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    private DeltaRequest loadDeltaRequest(DeltaSession session, byte[] data) throws
        ClassNotFoundException, IOException {
        ByteArrayInputStream fis = null;
        ReplicationStream ois = null;
        Loader loader = null;
        ClassLoader classLoader = null;
        //fix to be able to run the DeltaManager
        //stand alone without a container.
        //use the Threads context class loader
        if ( container != null ) 
            loader = container.getLoader();
        if ( loader != null ) 
            classLoader = loader.getClassLoader();
        else
            classLoader = Thread.currentThread().getContextClassLoader();
        //end fix
        fis = new ByteArrayInputStream(data);
        ois = new ReplicationStream(fis,classLoader);

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        // Initialize our internal data structures
        //sessions.clear(); //should not do this
        // Open an input stream to the specified pathname, if any
        ByteArrayInputStream fis = null;
        ObjectInputStream ois = null;
        Loader loader = null;
        ClassLoader classLoader = null;
        try {
            fis = new ByteArrayInputStream(data);
            BufferedInputStream bis = new BufferedInputStream(fis);
            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);
            }

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        }
        Class clazz = Class.forName(className);
        Class types[] = { ClassLoader.class };
        Object args[] = { parentClassLoader };
        Constructor constructor = clazz.getDeclaredConstructor(types);
        Loader loader = (Loader) constructor.newInstance(args);


        // Push the new loader onto the stack
        digester.push(loader);
        if (digester.getLogger().isDebugEnabled())
            digester.getLogger().debug("new " + loader.getClass().getName());


    }

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    }


    public void end(String namespace, String name)
        throws Exception {


        Loader loader = (Loader) digester.pop();
        if (digester.getLogger().isDebugEnabled())
            digester.getLogger().debug("pop " + loader.getClass().getName());


    }

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    public int getMapSendOptions() {
        return mapSendOptions;
    }
    
    public ClassLoader[] getClassLoaders() {
        Loader loader = null;
        ClassLoader classLoader = null;
        loader = this.getLoader();
        if (loader != null) classLoader = loader.getClassLoader();
        if ( classLoader == null ) classLoader = Thread.currentThread().getContextClassLoader();
        if ( classLoader == Thread.currentThread().getContextClassLoader() ) {
            return new ClassLoader[] {classLoader};
        } else {
            return new ClassLoader[] {classLoader,Thread.currentThread().getContextClassLoader()};

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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) && 
                    ! ((Context)getParent()).getPrivileged() ) {

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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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                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) && 
                    ! ((Context)getParent()).getPrivileged() ) {

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