/**
* Copyright 2016 Netflix, Inc.
*
* 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 com.netflix.hystrix.contrib.metrics.controller;
import java.util.concurrent.atomic.AtomicInteger;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Application;
import javax.ws.rs.core.Response;
import rx.functions.Func1;
import com.netflix.config.DynamicIntProperty;
import com.netflix.config.DynamicPropertyFactory;
import com.netflix.hystrix.contrib.metrics.HystrixStreamFeature;
import com.netflix.hystrix.metric.HystrixRequestEvents;
import com.netflix.hystrix.metric.HystrixRequestEventsStream;
import com.netflix.hystrix.serial.SerialHystrixRequestEvents;
/**
* Resource that writes SSE JSON every time a request is made
*
* <p>
* Install by:
* <p>
* 1) Including hystrix-metrics-event-stream-jaxrs-*.jar in your classpath.
* <p>
* 2) Register {@link HystrixStreamFeature} in your {@link Application}.
* <p>
* 3) Stream will be available at path /hystrix/request.stream
* <p>
*
* @author justinjose28
*
*/
@Path("/hystrix/request.stream")
public class HystrixRequestEventsSseController extends AbstractHystrixStreamController {
private static final AtomicInteger concurrentConnections = new AtomicInteger(0);
private static DynamicIntProperty maxConcurrentConnections = DynamicPropertyFactory.getInstance().getIntProperty("hystrix.config.stream.maxConcurrentConnections", 5);
public HystrixRequestEventsSseController() {
super(HystrixRequestEventsStream.getInstance().observe().map(new Func1<HystrixRequestEvents, String>() {
@Override
public String call(HystrixRequestEvents requestEvents) {
return SerialHystrixRequestEvents.toJsonString(requestEvents);
}
}));
}
@GET
public Response getStream() {
return handleRequest();
}
@Override
protected int getMaxNumberConcurrentConnectionsAllowed() {
return maxConcurrentConnections.get();
}
@Override
protected AtomicInteger getCurrentConnections() {
return concurrentConnections;
}
}