e494. registering for object changes in the directory.txt

这里面包含了一百多个JAVA源文件

This example registers with the directory to receive notification when changes are made to objects that have certain attributes. 
    try {
        // Get event context for registering listener
        EventDirContext ctx = (EventDirContext)(new InitialContext(env).lookup("ou=People"));
    
        // Create listener
        NamingListener listener = new SampleObjListener();
    
        // Specify to search the subtree
        SearchControls ctls = new SearchControls();
        ctls.setSearchScope(SearchControls.SUBTREE_SCOPE);
    
        // Specify the search filter of objects in which you're interested
        // Ask for objects that have "mail" attribute
        String filter = "(mail=*)";
    
        // Register listener for object change events
        ctx.addNamingListener("cn=John", filter, ctls, listener);
    } catch (NamingException e) {
    }
    
    public class SampleObjListener implements ObjectChangeListener {
        public SampleObjListener() {
        }
        public void objectChanged(NamingEvent evt) {
            process(evt.getNewBinding());
            process(evt.getOldBinding());
        }
        public void namingExceptionThrown(NamingExceptionEvent evt) {
            processException(evt.getException());
        }
    }