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) $

     * @throws IOException
     */
    public ReplicationStream getReplicationStream(byte[] data) throws 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);
        if ( classLoader == Thread.currentThread().getContextClassLoader() ) {

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     * @throws IOException
     */
    public ReplicationStream getReplicationStream(byte[] data) throws 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);
        if ( classLoader == Thread.currentThread().getContextClassLoader() ) {

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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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            if (debug >= 4)
                log("Destroying MBean for Manager " + dManager);
            MBeanUtils.destroyMBean(dManager);
        }
        
        Loader dLoader = dcontext.getLoader();
        if (dLoader != null) {
            if (debug >= 4)
                log("Destroying MBean for Loader " + dLoader);
            MBeanUtils.destroyMBean(dLoader);
        }

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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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                Valve valves[] = ((Pipeline) context).getValves();
                storeElementArray(aWriter, indent, valves);
            }


            // Store nested <Loader> elements
            Loader loader = context.getLoader();
            storeElement(aWriter, indent, loader);


            // Store nested <Manager> elements
            Manager manager = context.getManager();
            storeElement(aWriter, indent, manager);

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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;
        ClassLoader originalLoader = Thread.currentThread()
                .getContextClassLoader();
        try {


            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) {
                    if (log.isTraceEnabled())
                        log.trace(sm.getString(
                                "deltaManager.loading.withContextClassLoader",
                                getName()));

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