saihong

function interceptFunction (object, fnName, options) {
    var noop = function () {};
    var fnToWrap = object[fnName];
    var before = options.before || noop;
    var after = options.after || noop;

    object[fnName] = function () {
        before.apply(this, arguments);
        var result = fnToWrap.apply(this, arguments);
        after.apply(this, arguments);

saihong

//This sample is how to use websocket of Tomcat.
package wsapp;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.ArrayList;
import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WebSocketServlet;