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) $

    @Override
    public void setLoader(Loader loader) {


        Lock writeLock = loaderLock.writeLock();
        writeLock.lock();
        Loader oldLoader = null;
        try {
            // Change components if necessary
            oldLoader = this.loader;
            if (oldLoader == loader)
                return;

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        ClassLoader oldCCL = bindThread();


        try {
            if (ok) {
                // Start our subordinate components, if any
                Loader loader = getLoader();
                if ((loader != null) && (loader instanceof Lifecycle))
                    ((Lifecycle) loader).start();


                // since the loader just started, the webapp classloader is now
                // created.

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            }
            Cluster cluster = getClusterInternal();
            if ((cluster != null) && (cluster instanceof Lifecycle)) {
                ((Lifecycle) cluster).stop();
            }
            Loader loader = getLoader();
            if ((loader != null) && (loader instanceof Lifecycle)) {
                ((Lifecycle) loader).stop();
            }


            // Stop resources

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        synchronized (instanceListenersLock) {
            instanceListeners = new String[0];
        }


        Loader loader = getLoader();
        if ((loader != null) && (loader instanceof Lifecycle)) {
            ((Lifecycle) loader).destroy();
        }


        Manager manager = getManager();

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    public void backgroundProcess() {


        if (!getState().isAvailable())
            return;


        Loader loader = getLoader();
        if (loader != null) {
            try {
                loader.backgroundProcess();
            } catch (Exception e) {
                log.warn(sm.getString(
                        "standardContext.backgroundProcess.loader", loader), e);
            }
        }

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    }




    @Override
    public ClassLoader bind(boolean usePrivilegedAction, ClassLoader originalClassLoader) {
        Loader loader = getLoader();
        ClassLoader webApplicationClassLoader = null;
        if (loader != null) {
            webApplicationClassLoader = loader.getClassLoader();
        }


        if (originalClassLoader == null) {
            if (usePrivilegedAction) {
                PrivilegedAction<ClassLoader> pa = new PrivilegedGetTccl();

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        super.addChild(child);
    }


    public synchronized void setLoader(final Loader delegate) {
        Loader loader = new Loader() {


            public void backgroundProcess() {
                delegate.backgroundProcess();
            }

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        super.addChild(child);
    }


    public synchronized void setLoader(final Loader delegate) {
        Loader loader = new Loader() {


            public void backgroundProcess() {
                delegate.backgroundProcess();
            }

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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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            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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