InterceptCircuitBreakerExample.java

/* InterceptCircuitBreakerExample.java
 *
 * Copyright 2009-2015 Comcast Interactive Media, LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.fishwife.jrugged.examples.webapp;

import org.fishwife.jrugged.examples.BreakerResponseTweaker;
import org.fishwife.jrugged.spring.CircuitBreakerBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

@Controller()
public class InterceptCircuitBreakerExample {
    @Autowired
    private CircuitBreakerBean circuitBreakerBean;
    public CircuitBreakerBean getCircuitBreakerBean() {
        return circuitBreakerBean;
    }
    public void setCircuitBreakerBean(CircuitBreakerBean circuitBreakerBean) {
        this.circuitBreakerBean = circuitBreakerBean;
    }

    @Autowired
    private BreakerResponseTweaker breakerResponseTweaker;
    public BreakerResponseTweaker getResponseTweaker() {
        return breakerResponseTweaker;
    }
    public void setResponseTweaker(BreakerResponseTweaker breakerResponseTweaker) {
        this.breakerResponseTweaker = breakerResponseTweaker;
    }

    @RequestMapping("/interceptCircuitBreaker")
    public ModelAndView viewMain(HttpServletRequest request, HttpServletResponse response) throws Exception {
        int delayedFor = breakerResponseTweaker.delay();
        ModelAndView view = new ModelAndView("interceptBreaker");
        view.addObject("delay", new Integer(delayedFor));
        return view;
    }

    @RequestMapping("/interceptCircuitBreaker/stats")
    public ModelAndView viewPerformanceMonitor(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        final StringBuilder sb = new StringBuilder();

        // Go through all methods and invoke those with ManagedAttribute
        // marker annotations
        Method[] methods = circuitBreakerBean.getClass().getMethods();
        for (Method monitorMethod : methods) {
            if (monitorMethod.getName().startsWith("get")) {
                sb.append(
                    String.format("\t%s: %s\n",
                        monitorMethod.getName().substring(3),
                        monitorMethod.invoke(circuitBreakerBean, new Object[] {})
                    )
                );
            }
        }
        sb.append("\n");

        response.setContentType("text/plain");
        response.getWriter().println(sb.toString());
        return null;
    }
}