Examples of java.security.AccessControlContext

java.security.AccessControlContext
An AccessControlContext is used to make system resource access decisions based on the context it encapsulates.
More specifically, it encapsulates a context and has a single method, checkPermission, that is equivalent to the checkPermission method in the AccessController class, with one difference: The AccessControlContext checkPermission method makes access decisions based on the context it encapsulates, rather than that of the current execution thread.
Thus, the purpose of AccessControlContext is for those situations where a security check that should be made within a given context actually needs to be done from within a different context (for example, from within a worker thread).
An AccessControlContext is created by calling the AccessController.getContext method. The getContext method takes a "snapshot" of the current calling context, and places it in an AccessControlContext object, which it returns. A sample call is the following:
```
 AccessControlContext acc = AccessController.getContext() 
```
Code within a different context can subsequently call the checkPermission method on the previously-saved AccessControlContext object. A sample call is the following:
```
 acc.checkPermission(permission) 
```
@see AccessController @author Roland Schemers

            ContextManager.setCurrentCaller(((JAASTomcatPrincipal) principal).getSubject());
        }


        try {


            AccessControlContext acc = ContextManager.getCurrentContext();




            /**
             * JACC v1.0 section 4.1.2
             */
            acc.checkPermission(new WebResourcePermission(request));


        } catch (AccessControlException ace) {
            response.sendError(Response.SC_FORBIDDEN);
            return false;
        }

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        String name = getServletName(request);


        //Set the caller
        ContextManager.setCurrentCaller(((JAASTomcatPrincipal) principal).getSubject());


        AccessControlContext acc = ContextManager.getCurrentContext();


        try {
            /**
             * JACC v1.0 secion 4.1.3
             */
            acc.checkPermission(new WebRoleRefPermission(name, role));
        } catch (AccessControlException e) {
            return false;
        }


        return true;

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        SecurityManager sm = System.getSecurityManager();
        if (sm != null) sm.checkPermission(SET_CONTEXT);


        if (subject == null) throw new IllegalArgumentException("Subject must not be null");


        AccessControlContext acc = (AccessControlContext) Subject.doAsPrivileged(subject, new PrivilegedAction() {
            public Object run() {
                return AccessController.getContext();
            }
        }, null);

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    */
   public static Subject getSubject() {
      if (SUBJECT.get() != null) {
         return SUBJECT.get().peek();
      } else {
         AccessControlContext acc = AccessController.getContext();
         return Subject.getSubject(acc);
      }
   }

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    */
   static Object dispatchExecutionWrapper(final KernelControllerContext context, final ExecutionWrapper wrapper) throws Throwable
   {
      BeanMetaData metaData = context.getBeanMetaData();
      ClassLoader cl = Configurator.getClassLoader(metaData);
      AccessControlContext access = null;
      if (context instanceof AbstractKernelControllerContext)
      {
         AbstractKernelControllerContext theContext = (AbstractKernelControllerContext) context;
         access = theContext.getAccessControlContext();
      }

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         }
      }
      ProtectionDomain[] protectionDomains =
         new ProtectionDomain[]{new ProtectionDomain(new CodeSource(getCodeSource(),
            (java.security.cert.Certificate[])null), allPermissions)};
      return AccessController.doPrivileged(action, new AccessControlContext(protectionDomains));
   }

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    // Allow user to only read any file in docs directory
    final String aHome = System.getenv("ACCUMULO_HOME");
    PermissionCollection pc = new Permissions();
    pc.add(new FilePermission(aHome + "/docs/-", "read"));
    
    AccessControlContext acc = new AccessControlContext(new ProtectionDomain[] {new ProtectionDomain(null, pc)});
    
    IOException e = AccessController.doPrivileged(new PrivilegedAction<IOException>() {
      
      @Override
      public IOException run() {

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    private Session extendAuthentication(String workspaceName)
            throws RepositoryException, AccessDeniedException {


        Subject subject = null;
        try {
            AccessControlContext acc = AccessController.getContext();
            subject = Subject.getSubject(acc);
        } catch (SecurityException e) {
            log.warn("Can't check for preauthentication. Reason:", e.getMessage());
        }
        if (subject == null) {

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            _mbs = (MBeanServer) args[0];
            return null;
        }


        // Retrieve Subject from current AccessControlContext
        AccessControlContext acc = AccessController.getContext();
        Subject subject = Subject.getSubject(acc);


        try
        {
            // Allow operations performed locally on behalf of the connector server itself

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            return true;
        }
        
        final Object toTest = fromValue;
        boolean canConvert = false;
        AccessControlContext acc = blueprintContainer.getAccessControlContext();
        if (acc == null) {
            canConvert = canConvertWithConverters(toTest, toType);
        } else {
            canConvert = AccessController.doPrivileged(new PrivilegedAction<Boolean>() {
                public Boolean run() {

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