# Security { #security }

There are many ways to handle security, authentication and authorization.

And it normally is a complex and "difficult" topic.

In many frameworks and systems just handling security and authentication takes a big amount of effort and code (in many cases it can be 50% or more of all the code written).

    /*
     * TODO(cpovirk): move ForwardingTestCase somewhere common, and use it to
     * test the forwarded methods
     */
  }

  @AndroidIncompatible // Mocking ExecutorService is forbidden there. TODO(b/218700094): Don't mock.
  public void testListeningDecorator_noWrapExecuteTask() {
    ExecutorService delegate = mock(ExecutorService.class);
    ListeningExecutorService service = listeningDecorator(delegate);

 */
package jcifs;

/**
 * Opaque reference to a SMB tree
 *
 * @author mbechler
 *
 */
public interface SmbTree extends AutoCloseable {

    /**
     * Unwraps the tree instance to the specified type
     * @param <T> the target tree type
     * @param type the class of the tree type to unwrap to
     * @return tree instance with the given type
     */
    <T extends SmbTree> T unwrap(Class<T> type);

            try {
                if (this.treeConnection != null) {
                    // Release the tree connection if possible
                    log.debug("Releasing tree connection during emergency cleanup");
                }
            } catch (Exception e) {
                log.debug("Error releasing tree connection during emergency cleanup", e);
            }

                        // Clear all tree references
                        for (SmbTreeImpl tree : this.trees) {
                            try {
                                // Force release trees during emergency cleanup
                                tree.release();
                            } catch (Exception e) {
                                log.debug("Error during emergency tree cleanup", e);
                            }

    @Override
    public void connect() throws IOException {
        try (SmbTreeHandle th = ensureTreeConnected()) {}
    }

    /**
     * Retrieves the tree handle for this SMB resource
     *
     * @return a tree handle
     * @throws CIFSException if the tree connection cannot be established
     */
    public SmbTreeHandle getTreeHandle() throws CIFSException {
        return ensureTreeConnected();
    }

* Each application that you have running on your computer has some process behind it, each running program, each window, etc. And there are normally many processes running **at the same time** while a computer is on.
* There can be **multiple processes** of the **same program** running at the same time.

            return null;
        }

        MetadataTreeNode tree = null;
        MetadataTreeNode parent = null;

        for (ArtifactMetadata md : classpath) {
            MetadataTreeNode node = new MetadataTreeNode(md, parent, md.isResolved(), md.getArtifactScope());
            if (tree == null) {
                tree = node;
            }

            if (parent != null) {

     * @return The number of input documents.
     */
    public int getNumberOfInputDocs() {
        return numberOfInputDocs;
    }

    /**
     * Checks if there are any errors.
     * @return True if there are errors, false otherwise.
     */
    public boolean hasError() {
        return hasError;
    }

    /**
     * Returns the list of errors.
     * @return The list of errors.

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