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Decouple SSE servlets from the streams that produce JSON to allow alt…
…ernate methods of consumption
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Matt Jacobs
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Jan 26, 2016
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...c/main/java/com/netflix/hystrix/contrib/sample/stream/HystrixConfigurationJsonStream.java
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| /** | ||
| * 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.HystrixCollapserKey; | ||
| import com.netflix.hystrix.HystrixCommandKey; | ||
| import com.netflix.hystrix.HystrixThreadPoolKey; | ||
| import com.netflix.hystrix.config.HystrixCollapserConfiguration; | ||
| import com.netflix.hystrix.config.HystrixCommandConfiguration; | ||
| import com.netflix.hystrix.config.HystrixConfiguration; | ||
| import com.netflix.hystrix.config.HystrixConfigurationStream; | ||
| import com.netflix.hystrix.config.HystrixThreadPoolConfiguration; | ||
| import rx.Observable; | ||
| import rx.functions.Func1; | ||
|
|
||
| import java.io.IOException; | ||
| import java.io.StringWriter; | ||
| import java.util.Map; | ||
|
|
||
| /** | ||
| * Links HystrixConfigurationStream and JSON encoding. This may be consumed in a variety of ways: | ||
| * -such as- | ||
| * <ul> | ||
| * <li> {@link HystrixConfigSseServlet} 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> | ||
| * | ||
| */ | ||
| public class HystrixConfigurationJsonStream { | ||
|
|
||
| private static final JsonFactory jsonFactory = new JsonFactory(); | ||
| private final Func1<Integer, Observable<HystrixConfiguration>> streamGenerator; | ||
|
|
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| public HystrixConfigurationJsonStream() { | ||
| this.streamGenerator = new Func1<Integer, Observable<HystrixConfiguration>>() { | ||
| @Override | ||
| public Observable<HystrixConfiguration> call(Integer delay) { | ||
| return new HystrixConfigurationStream(delay).observe(); | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| public HystrixConfigurationJsonStream(Func1<Integer, Observable<HystrixConfiguration>> streamGenerator) { | ||
| this.streamGenerator = streamGenerator; | ||
| } | ||
|
|
||
| private static final Func1<HystrixConfiguration, String> convertToJson = new Func1<HystrixConfiguration, String>() { | ||
| @Override | ||
| public String call(HystrixConfiguration hystrixConfiguration) { | ||
| try { | ||
| return convertToString(hystrixConfiguration); | ||
| } catch (IOException ioe) { | ||
| throw new RuntimeException(ioe); | ||
| } | ||
| } | ||
| }; | ||
|
|
||
| private static void writeCommandConfigJson(JsonGenerator json, HystrixCommandKey key, HystrixCommandConfiguration commandConfig) throws IOException { | ||
| json.writeObjectFieldStart(key.name()); | ||
| json.writeStringField("threadPoolKey", commandConfig.getThreadPoolKey().name()); | ||
| json.writeStringField("groupKey", commandConfig.getGroupKey().name()); | ||
| json.writeObjectFieldStart("execution"); | ||
| HystrixCommandConfiguration.HystrixCommandExecutionConfig executionConfig = commandConfig.getExecutionConfig(); | ||
| json.writeStringField("isolationStrategy", executionConfig.getIsolationStrategy().name()); | ||
| json.writeStringField("threadPoolKeyOverride", executionConfig.getThreadPoolKeyOverride()); | ||
| json.writeBooleanField("requestCacheEnabled", executionConfig.isRequestCacheEnabled()); | ||
| json.writeBooleanField("requestLogEnabled", executionConfig.isRequestLogEnabled()); | ||
| json.writeBooleanField("timeoutEnabled", executionConfig.isTimeoutEnabled()); | ||
| json.writeBooleanField("fallbackEnabled", executionConfig.isFallbackEnabled()); | ||
| json.writeNumberField("timeoutInMilliseconds", executionConfig.getTimeoutInMilliseconds()); | ||
| json.writeNumberField("semaphoreSize", executionConfig.getSemaphoreMaxConcurrentRequests()); | ||
| json.writeNumberField("fallbackSemaphoreSize", executionConfig.getFallbackMaxConcurrentRequest()); | ||
| json.writeBooleanField("threadInterruptOnTimeout", executionConfig.isThreadInterruptOnTimeout()); | ||
| json.writeEndObject(); | ||
| json.writeObjectFieldStart("metrics"); | ||
| HystrixCommandConfiguration.HystrixCommandMetricsConfig metricsConfig = commandConfig.getMetricsConfig(); | ||
| json.writeNumberField("healthBucketSizeInMs", metricsConfig.getHealthIntervalInMilliseconds()); | ||
| json.writeNumberField("percentileBucketSizeInMilliseconds", metricsConfig.getRollingPercentileBucketSizeInMilliseconds()); | ||
| json.writeNumberField("percentileBucketCount", metricsConfig.getRollingCounterNumberOfBuckets()); | ||
| json.writeBooleanField("percentileEnabled", metricsConfig.isRollingPercentileEnabled()); | ||
| json.writeNumberField("counterBucketSizeInMilliseconds", metricsConfig.getRollingCounterBucketSizeInMilliseconds()); | ||
| json.writeNumberField("counterBucketCount", metricsConfig.getRollingCounterNumberOfBuckets()); | ||
| json.writeEndObject(); | ||
| json.writeObjectFieldStart("circuitBreaker"); | ||
| HystrixCommandConfiguration.HystrixCommandCircuitBreakerConfig circuitBreakerConfig = commandConfig.getCircuitBreakerConfig(); | ||
| json.writeBooleanField("enabled", circuitBreakerConfig.isEnabled()); | ||
| json.writeBooleanField("isForcedOpen", circuitBreakerConfig.isForceOpen()); | ||
| json.writeBooleanField("isForcedClosed", circuitBreakerConfig.isForceOpen()); | ||
| json.writeNumberField("requestVolumeThreshold", circuitBreakerConfig.getRequestVolumeThreshold()); | ||
| json.writeNumberField("errorPercentageThreshold", circuitBreakerConfig.getErrorThresholdPercentage()); | ||
| json.writeNumberField("sleepInMilliseconds", circuitBreakerConfig.getSleepWindowInMilliseconds()); | ||
| json.writeEndObject(); | ||
| json.writeEndObject(); | ||
| } | ||
|
|
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| private static void writeThreadPoolConfigJson(JsonGenerator json, HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolConfiguration threadPoolConfig) throws IOException { | ||
| json.writeObjectFieldStart(threadPoolKey.name()); | ||
| json.writeNumberField("coreSize", threadPoolConfig.getCoreSize()); | ||
| json.writeNumberField("maxQueueSize", threadPoolConfig.getMaxQueueSize()); | ||
| json.writeNumberField("queueRejectionThreshold", threadPoolConfig.getQueueRejectionThreshold()); | ||
| json.writeNumberField("keepAliveTimeInMinutes", threadPoolConfig.getKeepAliveTimeInMinutes()); | ||
| json.writeNumberField("counterBucketSizeInMilliseconds", threadPoolConfig.getRollingCounterBucketSizeInMilliseconds()); | ||
| json.writeNumberField("counterBucketCount", threadPoolConfig.getRollingCounterNumberOfBuckets()); | ||
| json.writeEndObject(); | ||
| } | ||
|
|
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| private static void writeCollapserConfigJson(JsonGenerator json, HystrixCollapserKey collapserKey, HystrixCollapserConfiguration collapserConfig) throws IOException { | ||
| json.writeObjectFieldStart(collapserKey.name()); | ||
| json.writeNumberField("maxRequestsInBatch", collapserConfig.getMaxRequestsInBatch()); | ||
| json.writeNumberField("timerDelayInMilliseconds", collapserConfig.getTimerDelayInMilliseconds()); | ||
| json.writeBooleanField("requestCacheEnabled", collapserConfig.isRequestCacheEnabled()); | ||
| json.writeObjectFieldStart("metrics"); | ||
| HystrixCollapserConfiguration.CollapserMetricsConfig metricsConfig = collapserConfig.getCollapserMetricsConfig(); | ||
| json.writeNumberField("percentileBucketSizeInMilliseconds", metricsConfig.getRollingPercentileBucketSizeInMilliseconds()); | ||
| json.writeNumberField("percentileBucketCount", metricsConfig.getRollingCounterNumberOfBuckets()); | ||
| json.writeBooleanField("percentileEnabled", metricsConfig.isRollingPercentileEnabled()); | ||
| json.writeNumberField("counterBucketSizeInMilliseconds", metricsConfig.getRollingCounterBucketSizeInMilliseconds()); | ||
| json.writeNumberField("counterBucketCount", metricsConfig.getRollingCounterNumberOfBuckets()); | ||
| json.writeEndObject(); | ||
| json.writeEndObject(); | ||
| } | ||
|
|
||
| public static String convertToString(HystrixConfiguration config) throws IOException { | ||
| StringWriter jsonString = new StringWriter(); | ||
| JsonGenerator json = jsonFactory.createGenerator(jsonString); | ||
|
|
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| json.writeStartObject(); | ||
| json.writeStringField("type", "HystrixConfig"); | ||
| json.writeObjectFieldStart("commands"); | ||
| for (Map.Entry<HystrixCommandKey, HystrixCommandConfiguration> entry: config.getCommandConfig().entrySet()) { | ||
| final HystrixCommandKey key = entry.getKey(); | ||
| final HystrixCommandConfiguration commandConfig = entry.getValue(); | ||
| writeCommandConfigJson(json, key, commandConfig); | ||
|
|
||
| } | ||
| json.writeEndObject(); | ||
|
|
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| json.writeObjectFieldStart("threadpools"); | ||
| for (Map.Entry<HystrixThreadPoolKey, HystrixThreadPoolConfiguration> entry: config.getThreadPoolConfig().entrySet()) { | ||
| final HystrixThreadPoolKey threadPoolKey = entry.getKey(); | ||
| final HystrixThreadPoolConfiguration threadPoolConfig = entry.getValue(); | ||
| writeThreadPoolConfigJson(json, threadPoolKey, threadPoolConfig); | ||
| } | ||
| json.writeEndObject(); | ||
|
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| json.writeObjectFieldStart("collapsers"); | ||
| for (Map.Entry<HystrixCollapserKey, HystrixCollapserConfiguration> entry: config.getCollapserConfig().entrySet()) { | ||
| final HystrixCollapserKey collapserKey = entry.getKey(); | ||
| final HystrixCollapserConfiguration collapserConfig = entry.getValue(); | ||
| writeCollapserConfigJson(json, collapserKey, collapserConfig); | ||
| } | ||
| json.writeEndObject(); | ||
| json.writeEndObject(); | ||
| json.close(); | ||
|
|
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| return jsonString.getBuffer().toString(); | ||
| } | ||
|
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| public Observable<HystrixConfiguration> observe(int delay) { | ||
| return streamGenerator.call(delay); | ||
| } | ||
|
|
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| public Observable<String> observeJson(int delay) { | ||
| return streamGenerator.call(delay).map(convertToJson); | ||
| } | ||
| } |
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