/*
* Copyright 2013-2016 the original author or authors.
*
* 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.springframework.cloud.netflix.hystrix;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.catalina.core.ApplicationContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.endpoint.Endpoint;
import org.springframework.boot.actuate.metrics.GaugeService;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.client.actuator.HasFeatures;
import org.springframework.cloud.client.actuator.NamedFeature;
import org.springframework.context.SmartLifecycle;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.netflix.hystrix.Hystrix;
import com.netflix.hystrix.contrib.javanica.aop.aspectj.HystrixCommandAspect;
import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsPoller;
import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsPoller.MetricsAsJsonPollerListener;
import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
/**
* @author Spencer Gibb
* @author Christian Dupuis
* @author Venil Noronha
*/
@Configuration
public class HystrixCircuitBreakerConfiguration {
@Bean
public HystrixCommandAspect hystrixCommandAspect() {
return new HystrixCommandAspect();
}
@Bean
public HystrixShutdownHook hystrixShutdownHook() {
return new HystrixShutdownHook();
}
@Bean
public HasFeatures hystrixFeature() {
return HasFeatures.namedFeatures(new NamedFeature("Hystrix", HystrixCommandAspect.class));
}
@Configuration
@ConditionalOnProperty(value = "hystrix.stream.endpoint.enabled", matchIfMissing = true)
@ConditionalOnWebApplication
@ConditionalOnClass({ Endpoint.class, HystrixMetricsStreamServlet.class })
protected static class HystrixWebConfiguration {
@Bean
public HystrixStreamEndpoint hystrixStreamEndpoint() {
return new HystrixStreamEndpoint();
}
@Bean
public HasFeatures hystrixStreamFeature() {
return HasFeatures.namedFeature("Hystrix Stream Servlet", HystrixStreamEndpoint.class);
}
}
@Configuration
@ConditionalOnProperty(value = "hystrix.metrics.enabled", matchIfMissing = true)
@ConditionalOnClass({ HystrixMetricsPoller.class, GaugeService.class })
@EnableConfigurationProperties(HystrixMetricsProperties.class)
protected static class HystrixMetricsPollerConfiguration implements SmartLifecycle {
private static Log logger = LogFactory
.getLog(HystrixMetricsPollerConfiguration.class);
@Autowired(required = false)
private GaugeService gauges;
@Autowired
private HystrixMetricsProperties metricsProperties;
private ObjectMapper mapper = new ObjectMapper();
private HystrixMetricsPoller poller;
private Set<String> reserved = new HashSet<String>(Arrays.asList("group", "name",
"type", "currentTime"));
@Override
public void start() {
if (this.gauges == null) {
return;
}
MetricsAsJsonPollerListener listener = new MetricsAsJsonPollerListener() {
@Override
public void handleJsonMetric(String json) {
try {
@SuppressWarnings("unchecked")
Map<String, Object> map = HystrixMetricsPollerConfiguration.this.mapper
.readValue(json, Map.class);
if (map != null && map.containsKey("type")) {
addMetrics(map, "hystrix.");
}
}
catch (IOException ex) {
// ignore
}
}
};
this.poller = new HystrixMetricsPoller(listener,
metricsProperties.getPollingIntervalMs());
// start polling and it will write directly to the listener
this.poller.start();
logger.info("Starting poller");
}
private void addMetrics(Map<String, Object> map, String root) {
StringBuilder prefixBuilder = new StringBuilder(root);
if (map.containsKey("type")) {
prefixBuilder.append((String) map.get("type"));
if (map.containsKey("group")) {
prefixBuilder.append(".").append(map.get("group"));
}
prefixBuilder.append(".").append(map.get("name"));
}
String prefix = prefixBuilder.toString();
for (String key : map.keySet()) {
Object value = map.get(key);
if (!this.reserved.contains(key)) {
if (value instanceof Number) {
String name = prefix + "." + key;
this.gauges.submit(name, ((Number) value).doubleValue());
}
else if (value instanceof Map) {
@SuppressWarnings("unchecked")
Map<String, Object> sub = (Map<String, Object>) value;
addMetrics(sub, prefix);
}
}
}
}
@Override
public void stop() {
if (this.poller != null) {
this.poller.shutdown();
}
}
@Override
public boolean isRunning() {
return this.poller != null ? this.poller.isRunning() : false;
}
@Override
public int getPhase() {
return Ordered.LOWEST_PRECEDENCE;
}
@Override
public boolean isAutoStartup() {
return true;
}
@Override
public void stop(Runnable callback) {
if (this.poller != null) {
this.poller.shutdown();
}
callback.run();
}
}
/**
* {@link DisposableBean} that makes sure that Hystrix internal state is cleared when
* {@link ApplicationContext} shuts down.
*/
private class HystrixShutdownHook implements DisposableBean {
@Override
public void destroy() throws Exception {
// Just call Hystrix to reset thread pool etc.
Hystrix.reset();
}
}
}