Java tutorial
/** * 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.serial; import com.fasterxml.jackson.core.JsonGenerator; import com.netflix.hystrix.HystrixCircuitBreaker; import com.netflix.hystrix.HystrixCollapserKey; import com.netflix.hystrix.HystrixCollapserMetrics; import com.netflix.hystrix.HystrixCommandKey; import com.netflix.hystrix.HystrixCommandMetrics; import com.netflix.hystrix.HystrixCommandProperties; import com.netflix.hystrix.HystrixEventType; import com.netflix.hystrix.HystrixThreadPoolKey; import com.netflix.hystrix.HystrixThreadPoolMetrics; import com.netflix.hystrix.metric.consumer.HystrixDashboardStream; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import rx.functions.Func0; import java.io.IOException; import java.io.StringWriter; import java.util.ArrayList; import java.util.List; public class SerialHystrixDashboardData extends SerialHystrixMetric { private static final Logger logger = LoggerFactory.getLogger(SerialHystrixDashboardData.class); @Deprecated public static byte[] toBytes(HystrixDashboardStream.DashboardData dashboardData) { throw new UnsupportedOperationException( "Not implemented anymore. Will be implemented in a new class shortly"); } public static String toJsonString(HystrixDashboardStream.DashboardData dashboardData) { StringWriter jsonString = new StringWriter(); try { JsonGenerator json = jsonFactory.createGenerator(jsonString); writeDashboardData(json, dashboardData); } catch (Exception e) { throw new RuntimeException(e); } return jsonString.getBuffer().toString(); } public static List<String> toMultipleJsonStrings(HystrixDashboardStream.DashboardData dashboardData) { List<String> jsonStrings = new ArrayList<String>(); for (HystrixCommandMetrics commandMetrics : dashboardData.getCommandMetrics()) { jsonStrings.add(toJsonString(commandMetrics)); } for (HystrixThreadPoolMetrics threadPoolMetrics : dashboardData.getThreadPoolMetrics()) { jsonStrings.add(toJsonString(threadPoolMetrics)); } for (HystrixCollapserMetrics collapserMetrics : dashboardData.getCollapserMetrics()) { jsonStrings.add(toJsonString(collapserMetrics)); } return jsonStrings; } private static void writeDashboardData(JsonGenerator json, HystrixDashboardStream.DashboardData dashboardData) { try { json.writeStartArray(); for (HystrixCommandMetrics commandMetrics : dashboardData.getCommandMetrics()) { writeCommandMetrics(commandMetrics, json); } for (HystrixThreadPoolMetrics threadPoolMetrics : dashboardData.getThreadPoolMetrics()) { writeThreadPoolMetrics(threadPoolMetrics, json); } for (HystrixCollapserMetrics collapserMetrics : dashboardData.getCollapserMetrics()) { writeCollapserMetrics(collapserMetrics, json); } json.writeEndArray(); json.close(); } catch (Exception e) { throw new RuntimeException(e); } } public static String toJsonString(HystrixCommandMetrics commandMetrics) { StringWriter jsonString = new StringWriter(); try { JsonGenerator json = jsonFactory.createGenerator(jsonString); writeCommandMetrics(commandMetrics, json); json.close(); return jsonString.getBuffer().toString(); } catch (IOException ioe) { throw new RuntimeException(ioe); } } public static String toJsonString(HystrixThreadPoolMetrics threadPoolMetrics) { StringWriter jsonString = new StringWriter(); try { JsonGenerator json = jsonFactory.createGenerator(jsonString); writeThreadPoolMetrics(threadPoolMetrics, json); json.close(); return jsonString.getBuffer().toString(); } catch (IOException ioe) { throw new RuntimeException(ioe); } } public static String toJsonString(HystrixCollapserMetrics collapserMetrics) { StringWriter jsonString = new StringWriter(); try { JsonGenerator json = jsonFactory.createGenerator(jsonString); writeCollapserMetrics(collapserMetrics, json); json.close(); return jsonString.getBuffer().toString(); } catch (IOException ioe) { throw new RuntimeException(ioe); } } private static void writeCommandMetrics(final HystrixCommandMetrics commandMetrics, JsonGenerator json) throws IOException { HystrixCommandKey key = commandMetrics.getCommandKey(); HystrixCircuitBreaker circuitBreaker = HystrixCircuitBreaker.Factory.getInstance(key); json.writeStartObject(); json.writeStringField("type", "HystrixCommand"); json.writeStringField("name", key.name()); json.writeStringField("group", commandMetrics.getCommandGroup().name()); json.writeNumberField("currentTime", System.currentTimeMillis()); // circuit breaker if (circuitBreaker == null) { // circuit breaker is disabled and thus never open json.writeBooleanField("isCircuitBreakerOpen", false); } else { json.writeBooleanField("isCircuitBreakerOpen", circuitBreaker.isOpen()); } HystrixCommandMetrics.HealthCounts healthCounts = commandMetrics.getHealthCounts(); json.writeNumberField("errorPercentage", healthCounts.getErrorPercentage()); json.writeNumberField("errorCount", healthCounts.getErrorCount()); json.writeNumberField("requestCount", healthCounts.getTotalRequests()); // rolling counters safelyWriteNumberField(json, "rollingCountBadRequests", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.BAD_REQUEST); } }); safelyWriteNumberField(json, "rollingCountCollapsedRequests", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.COLLAPSED); } }); safelyWriteNumberField(json, "rollingCountEmit", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.EMIT); } }); safelyWriteNumberField(json, "rollingCountExceptionsThrown", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.EXCEPTION_THROWN); } }); safelyWriteNumberField(json, "rollingCountFailure", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.FAILURE); } }); safelyWriteNumberField(json, "rollingCountFallbackEmit", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.FALLBACK_EMIT); } }); safelyWriteNumberField(json, "rollingCountFallbackFailure", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.FALLBACK_FAILURE); } }); safelyWriteNumberField(json, "rollingCountFallbackMissing", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.FALLBACK_MISSING); } }); safelyWriteNumberField(json, "rollingCountFallbackRejection", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.FALLBACK_REJECTION); } }); safelyWriteNumberField(json, "rollingCountFallbackSuccess", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.FALLBACK_SUCCESS); } }); safelyWriteNumberField(json, "rollingCountResponsesFromCache", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.RESPONSE_FROM_CACHE); } }); safelyWriteNumberField(json, "rollingCountSemaphoreRejected", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.SEMAPHORE_REJECTED); } }); safelyWriteNumberField(json, "rollingCountShortCircuited", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.SHORT_CIRCUITED); } }); safelyWriteNumberField(json, "rollingCountSuccess", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.SUCCESS); } }); safelyWriteNumberField(json, "rollingCountThreadPoolRejected", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.THREAD_POOL_REJECTED); } }); safelyWriteNumberField(json, "rollingCountTimeout", new Func0<Long>() { @Override public Long call() { return commandMetrics.getRollingCount(HystrixEventType.TIMEOUT); } }); json.writeNumberField("currentConcurrentExecutionCount", commandMetrics.getCurrentConcurrentExecutionCount()); json.writeNumberField("rollingMaxConcurrentExecutionCount", commandMetrics.getRollingMaxConcurrentExecutions()); // latency percentiles json.writeNumberField("latencyExecute_mean", commandMetrics.getExecutionTimeMean()); json.writeObjectFieldStart("latencyExecute"); json.writeNumberField("0", commandMetrics.getExecutionTimePercentile(0)); json.writeNumberField("25", commandMetrics.getExecutionTimePercentile(25)); json.writeNumberField("50", commandMetrics.getExecutionTimePercentile(50)); json.writeNumberField("75", commandMetrics.getExecutionTimePercentile(75)); json.writeNumberField("90", commandMetrics.getExecutionTimePercentile(90)); json.writeNumberField("95", commandMetrics.getExecutionTimePercentile(95)); json.writeNumberField("99", commandMetrics.getExecutionTimePercentile(99)); json.writeNumberField("99.5", commandMetrics.getExecutionTimePercentile(99.5)); json.writeNumberField("100", commandMetrics.getExecutionTimePercentile(100)); json.writeEndObject(); // json.writeNumberField("latencyTotal_mean", commandMetrics.getTotalTimeMean()); json.writeObjectFieldStart("latencyTotal"); json.writeNumberField("0", commandMetrics.getTotalTimePercentile(0)); json.writeNumberField("25", commandMetrics.getTotalTimePercentile(25)); json.writeNumberField("50", commandMetrics.getTotalTimePercentile(50)); json.writeNumberField("75", commandMetrics.getTotalTimePercentile(75)); json.writeNumberField("90", commandMetrics.getTotalTimePercentile(90)); json.writeNumberField("95", commandMetrics.getTotalTimePercentile(95)); json.writeNumberField("99", commandMetrics.getTotalTimePercentile(99)); json.writeNumberField("99.5", commandMetrics.getTotalTimePercentile(99.5)); json.writeNumberField("100", commandMetrics.getTotalTimePercentile(100)); json.writeEndObject(); // property values for reporting what is actually seen by the command rather than what was set somewhere HystrixCommandProperties commandProperties = commandMetrics.getProperties(); json.writeNumberField("propertyValue_circuitBreakerRequestVolumeThreshold", commandProperties.circuitBreakerRequestVolumeThreshold().get()); json.writeNumberField("propertyValue_circuitBreakerSleepWindowInMilliseconds", commandProperties.circuitBreakerSleepWindowInMilliseconds().get()); json.writeNumberField("propertyValue_circuitBreakerErrorThresholdPercentage", commandProperties.circuitBreakerErrorThresholdPercentage().get()); json.writeBooleanField("propertyValue_circuitBreakerForceOpen", commandProperties.circuitBreakerForceOpen().get()); json.writeBooleanField("propertyValue_circuitBreakerForceClosed", commandProperties.circuitBreakerForceClosed().get()); json.writeBooleanField("propertyValue_circuitBreakerEnabled", commandProperties.circuitBreakerEnabled().get()); json.writeStringField("propertyValue_executionIsolationStrategy", commandProperties.executionIsolationStrategy().get().name()); json.writeNumberField("propertyValue_executionIsolationThreadTimeoutInMilliseconds", commandProperties.executionTimeoutInMilliseconds().get()); json.writeNumberField("propertyValue_executionTimeoutInMilliseconds", commandProperties.executionTimeoutInMilliseconds().get()); json.writeBooleanField("propertyValue_executionIsolationThreadInterruptOnTimeout", commandProperties.executionIsolationThreadInterruptOnTimeout().get()); json.writeStringField("propertyValue_executionIsolationThreadPoolKeyOverride", commandProperties.executionIsolationThreadPoolKeyOverride().get()); json.writeNumberField("propertyValue_executionIsolationSemaphoreMaxConcurrentRequests", commandProperties.executionIsolationSemaphoreMaxConcurrentRequests().get()); json.writeNumberField("propertyValue_fallbackIsolationSemaphoreMaxConcurrentRequests", commandProperties.fallbackIsolationSemaphoreMaxConcurrentRequests().get()); /* * The following are commented out as these rarely change and are verbose for streaming for something people don't change. * We could perhaps allow a property or request argument to include these. */ // json.put("propertyValue_metricsRollingPercentileEnabled", commandProperties.metricsRollingPercentileEnabled().get()); // json.put("propertyValue_metricsRollingPercentileBucketSize", commandProperties.metricsRollingPercentileBucketSize().get()); // json.put("propertyValue_metricsRollingPercentileWindow", commandProperties.metricsRollingPercentileWindowInMilliseconds().get()); // json.put("propertyValue_metricsRollingPercentileWindowBuckets", commandProperties.metricsRollingPercentileWindowBuckets().get()); // json.put("propertyValue_metricsRollingStatisticalWindowBuckets", commandProperties.metricsRollingStatisticalWindowBuckets().get()); json.writeNumberField("propertyValue_metricsRollingStatisticalWindowInMilliseconds", commandProperties.metricsRollingStatisticalWindowInMilliseconds().get()); json.writeBooleanField("propertyValue_requestCacheEnabled", commandProperties.requestCacheEnabled().get()); json.writeBooleanField("propertyValue_requestLogEnabled", commandProperties.requestLogEnabled().get()); json.writeNumberField("reportingHosts", 1); // this will get summed across all instances in a cluster json.writeStringField("threadPool", commandMetrics.getThreadPoolKey().name()); json.writeEndObject(); } private static void writeThreadPoolMetrics(final HystrixThreadPoolMetrics threadPoolMetrics, JsonGenerator json) throws IOException { HystrixThreadPoolKey key = threadPoolMetrics.getThreadPoolKey(); json.writeStartObject(); json.writeStringField("type", "HystrixThreadPool"); json.writeStringField("name", key.name()); json.writeNumberField("currentTime", System.currentTimeMillis()); json.writeNumberField("currentActiveCount", threadPoolMetrics.getCurrentActiveCount().intValue()); json.writeNumberField("currentCompletedTaskCount", threadPoolMetrics.getCurrentCompletedTaskCount().longValue()); json.writeNumberField("currentCorePoolSize", threadPoolMetrics.getCurrentCorePoolSize().intValue()); json.writeNumberField("currentLargestPoolSize", threadPoolMetrics.getCurrentLargestPoolSize().intValue()); json.writeNumberField("currentMaximumPoolSize", threadPoolMetrics.getCurrentMaximumPoolSize().intValue()); json.writeNumberField("currentPoolSize", threadPoolMetrics.getCurrentPoolSize().intValue()); json.writeNumberField("currentQueueSize", threadPoolMetrics.getCurrentQueueSize().intValue()); json.writeNumberField("currentTaskCount", threadPoolMetrics.getCurrentTaskCount().longValue()); safelyWriteNumberField(json, "rollingCountThreadsExecuted", new Func0<Long>() { @Override public Long call() { return threadPoolMetrics.getRollingCount(HystrixEventType.ThreadPool.EXECUTED); } }); json.writeNumberField("rollingMaxActiveThreads", threadPoolMetrics.getRollingMaxActiveThreads()); safelyWriteNumberField(json, "rollingCountCommandRejections", new Func0<Long>() { @Override public Long call() { return threadPoolMetrics.getRollingCount(HystrixEventType.ThreadPool.REJECTED); } }); json.writeNumberField("propertyValue_queueSizeRejectionThreshold", threadPoolMetrics.getProperties().queueSizeRejectionThreshold().get()); json.writeNumberField("propertyValue_metricsRollingStatisticalWindowInMilliseconds", threadPoolMetrics.getProperties().metricsRollingStatisticalWindowInMilliseconds().get()); json.writeNumberField("reportingHosts", 1); // this will get summed across all instances in a cluster json.writeEndObject(); } private static void writeCollapserMetrics(final HystrixCollapserMetrics collapserMetrics, JsonGenerator json) throws IOException { HystrixCollapserKey key = collapserMetrics.getCollapserKey(); json.writeStartObject(); json.writeStringField("type", "HystrixCollapser"); json.writeStringField("name", key.name()); json.writeNumberField("currentTime", System.currentTimeMillis()); safelyWriteNumberField(json, "rollingCountRequestsBatched", new Func0<Long>() { @Override public Long call() { return collapserMetrics.getRollingCount(HystrixEventType.Collapser.ADDED_TO_BATCH); } }); safelyWriteNumberField(json, "rollingCountBatches", new Func0<Long>() { @Override public Long call() { return collapserMetrics.getRollingCount(HystrixEventType.Collapser.BATCH_EXECUTED); } }); safelyWriteNumberField(json, "rollingCountResponsesFromCache", new Func0<Long>() { @Override public Long call() { return collapserMetrics.getRollingCount(HystrixEventType.Collapser.RESPONSE_FROM_CACHE); } }); // batch size percentiles json.writeNumberField("batchSize_mean", collapserMetrics.getBatchSizeMean()); json.writeObjectFieldStart("batchSize"); json.writeNumberField("25", collapserMetrics.getBatchSizePercentile(25)); json.writeNumberField("50", collapserMetrics.getBatchSizePercentile(50)); json.writeNumberField("75", collapserMetrics.getBatchSizePercentile(75)); json.writeNumberField("90", collapserMetrics.getBatchSizePercentile(90)); json.writeNumberField("95", collapserMetrics.getBatchSizePercentile(95)); json.writeNumberField("99", collapserMetrics.getBatchSizePercentile(99)); json.writeNumberField("99.5", collapserMetrics.getBatchSizePercentile(99.5)); json.writeNumberField("100", collapserMetrics.getBatchSizePercentile(100)); json.writeEndObject(); // shard size percentiles (commented-out for now) //json.writeNumberField("shardSize_mean", collapserMetrics.getShardSizeMean()); //json.writeObjectFieldStart("shardSize"); //json.writeNumberField("25", collapserMetrics.getShardSizePercentile(25)); //json.writeNumberField("50", collapserMetrics.getShardSizePercentile(50)); //json.writeNumberField("75", collapserMetrics.getShardSizePercentile(75)); //json.writeNumberField("90", collapserMetrics.getShardSizePercentile(90)); //json.writeNumberField("95", collapserMetrics.getShardSizePercentile(95)); //json.writeNumberField("99", collapserMetrics.getShardSizePercentile(99)); //json.writeNumberField("99.5", collapserMetrics.getShardSizePercentile(99.5)); //json.writeNumberField("100", collapserMetrics.getShardSizePercentile(100)); //json.writeEndObject(); //json.writeNumberField("propertyValue_metricsRollingStatisticalWindowInMilliseconds", collapserMetrics.getProperties().metricsRollingStatisticalWindowInMilliseconds().get()); json.writeBooleanField("propertyValue_requestCacheEnabled", collapserMetrics.getProperties().requestCacheEnabled().get()); json.writeNumberField("propertyValue_maxRequestsInBatch", collapserMetrics.getProperties().maxRequestsInBatch().get()); json.writeNumberField("propertyValue_timerDelayInMilliseconds", collapserMetrics.getProperties().timerDelayInMilliseconds().get()); json.writeNumberField("reportingHosts", 1); // this will get summed across all instances in a cluster json.writeEndObject(); } protected static void safelyWriteNumberField(JsonGenerator json, String name, Func0<Long> metricGenerator) throws IOException { try { json.writeNumberField(name, metricGenerator.call()); } catch (NoSuchFieldError error) { logger.error("While publishing Hystrix metrics stream, error looking up eventType for : " + name + ". Please check that all Hystrix versions are the same!"); json.writeNumberField(name, 0L); } } }