/**
* Copyright 2016 Netflix, Inc.
* <p/>
* 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
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* 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.sample.stream;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.netflix.hystrix.HystrixCommandKey;
import com.netflix.hystrix.HystrixThreadPoolKey;
import com.netflix.hystrix.metric.sample.HystrixCommandUtilization;
import com.netflix.hystrix.metric.sample.HystrixThreadPoolUtilization;
import com.netflix.hystrix.metric.sample.HystrixUtilization;
import com.netflix.hystrix.metric.sample.HystrixUtilizationStream;
import rx.Observable;
import rx.functions.Func1;
import java.io.IOException;
import java.io.StringWriter;
import java.util.Map;
/**
* Links HystrixUtilizationStream and JSON encoding. This may be consumed in a variety of ways:
* -such as-
* <ul>
* <li> {@link HystrixUtilizationSseServlet} for mapping a specific URL to this data as an SSE stream
* <li> Consumer of your choice that wants control over where to embed this stream
* </ul>
* @deprecated Instead, prefer mapping your preferred serialization on top of {@link HystrixUtilizationStream#observe()}.
*/
@Deprecated //since 1.5.4
public class HystrixUtilizationJsonStream {
private final Func1<Integer, Observable<HystrixUtilization>> streamGenerator;
private static final JsonFactory jsonFactory = new JsonFactory();
private static final Func1<HystrixUtilization, String> convertToJsonFunc = new Func1<HystrixUtilization, String>() {
@Override
public String call(HystrixUtilization utilization) {
try {
return convertToJson(utilization);
} catch (IOException ioe) {
throw new RuntimeException(ioe);
}
}
};
@Deprecated //since 1.5.4
public HystrixUtilizationJsonStream() {
this.streamGenerator = new Func1<Integer, Observable<HystrixUtilization>>() {
@Override
public Observable<HystrixUtilization> call(Integer delay) {
return HystrixUtilizationStream.getInstance().observe();
}
};
}
@Deprecated //since 1.5.4
public HystrixUtilizationJsonStream(Func1<Integer, Observable<HystrixUtilization>> streamGenerator) {
this.streamGenerator = streamGenerator;
}
private static void writeCommandUtilizationJson(JsonGenerator json, HystrixCommandKey key, HystrixCommandUtilization utilization) throws IOException {
json.writeObjectFieldStart(key.name());
json.writeNumberField("activeCount", utilization.getConcurrentCommandCount());
json.writeEndObject();
}
private static void writeThreadPoolUtilizationJson(JsonGenerator json, HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolUtilization utilization) throws IOException {
json.writeObjectFieldStart(threadPoolKey.name());
json.writeNumberField("activeCount", utilization.getCurrentActiveCount());
json.writeNumberField("queueSize", utilization.getCurrentQueueSize());
json.writeNumberField("corePoolSize", utilization.getCurrentCorePoolSize());
json.writeNumberField("poolSize", utilization.getCurrentPoolSize());
json.writeEndObject();
}
protected static String convertToJson(HystrixUtilization utilization) throws IOException {
StringWriter jsonString = new StringWriter();
JsonGenerator json = jsonFactory.createGenerator(jsonString);
json.writeStartObject();
json.writeStringField("type", "HystrixUtilization");
json.writeObjectFieldStart("commands");
for (Map.Entry<HystrixCommandKey, HystrixCommandUtilization> entry: utilization.getCommandUtilizationMap().entrySet()) {
final HystrixCommandKey key = entry.getKey();
final HystrixCommandUtilization commandUtilization = entry.getValue();
writeCommandUtilizationJson(json, key, commandUtilization);
}
json.writeEndObject();
json.writeObjectFieldStart("threadpools");
for (Map.Entry<HystrixThreadPoolKey, HystrixThreadPoolUtilization> entry: utilization.getThreadPoolUtilizationMap().entrySet()) {
final HystrixThreadPoolKey threadPoolKey = entry.getKey();
final HystrixThreadPoolUtilization threadPoolUtilization = entry.getValue();
writeThreadPoolUtilizationJson(json, threadPoolKey, threadPoolUtilization);
}
json.writeEndObject();
json.writeEndObject();
json.close();
return jsonString.getBuffer().toString();
}
/**
* @deprecated Not for public use. Using the delay param prevents streams from being efficiently shared.
* Please use {@link HystrixUtilizationStream#observe()}
* @param delay interval between data emissions
* @return sampled utilization as Java object, taken on a timer
*/
@Deprecated //deprecated as of 1.5.4
public Observable<HystrixUtilization> observe(int delay) {
return streamGenerator.call(delay);
}
/**
* @deprecated Not for public use. Using the delay param prevents streams from being efficiently shared.
* Please use {@link HystrixUtilizationStream#observe()}
* and the {@link #convertToJson(HystrixUtilization)} method
* @param delay interval between data emissions
* @return sampled utilization as JSON string, taken on a timer
*/
public Observable<String> observeJson(int delay) {
return streamGenerator.call(delay).map(convertToJsonFunc);
}
}