package com.panzhihua.common.utlis;
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import com.netflix.hystrix.HystrixThreadPoolKey;
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import com.netflix.hystrix.HystrixThreadPoolProperties;
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import com.netflix.hystrix.strategy.HystrixPlugins;
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import com.netflix.hystrix.strategy.concurrency.HystrixConcurrencyStrategy;
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import com.netflix.hystrix.strategy.concurrency.HystrixRequestVariable;
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import com.netflix.hystrix.strategy.concurrency.HystrixRequestVariableLifecycle;
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import com.netflix.hystrix.strategy.eventnotifier.HystrixEventNotifier;
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import com.netflix.hystrix.strategy.executionhook.HystrixCommandExecutionHook;
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import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisher;
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import com.netflix.hystrix.strategy.properties.HystrixPropertiesStrategy;
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import com.netflix.hystrix.strategy.properties.HystrixProperty;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.stereotype.Component;
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import org.springframework.web.context.request.RequestAttributes;
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import org.springframework.web.context.request.RequestContextHolder;
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import java.util.concurrent.BlockingQueue;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ThreadPoolExecutor;
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import java.util.concurrent.TimeUnit;
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@Component
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public class FeignHystrixConcurrencyStrategy extends HystrixConcurrencyStrategy {
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private static final Logger log = LoggerFactory.getLogger(FeignHystrixConcurrencyStrategy.class);
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private HystrixConcurrencyStrategy delegate;
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public FeignHystrixConcurrencyStrategy() {
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try {
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this.delegate = HystrixPlugins.getInstance().getConcurrencyStrategy();
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if (this.delegate instanceof FeignHystrixConcurrencyStrategy) {
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// Welcome to singleton hell...
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return;
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}
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HystrixCommandExecutionHook commandExecutionHook = HystrixPlugins
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.getInstance().getCommandExecutionHook();
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HystrixEventNotifier eventNotifier = HystrixPlugins.getInstance()
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.getEventNotifier();
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HystrixMetricsPublisher metricsPublisher = HystrixPlugins.getInstance()
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.getMetricsPublisher();
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HystrixPropertiesStrategy propertiesStrategy = HystrixPlugins.getInstance()
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.getPropertiesStrategy();
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this.logCurrentStateOfHystrixPlugins(eventNotifier, metricsPublisher,
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propertiesStrategy);
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HystrixPlugins.reset();
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HystrixPlugins.getInstance().registerConcurrencyStrategy(this);
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HystrixPlugins.getInstance()
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.registerCommandExecutionHook(commandExecutionHook);
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HystrixPlugins.getInstance().registerEventNotifier(eventNotifier);
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HystrixPlugins.getInstance().registerMetricsPublisher(metricsPublisher);
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HystrixPlugins.getInstance().registerPropertiesStrategy(propertiesStrategy);
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}
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catch (Exception e) {
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log.error("Failed to register Sleuth Hystrix Concurrency Strategy", e);
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}
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}
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private void logCurrentStateOfHystrixPlugins(HystrixEventNotifier eventNotifier,
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HystrixMetricsPublisher metricsPublisher,
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HystrixPropertiesStrategy propertiesStrategy) {
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if (log.isDebugEnabled()) {
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log.debug("Current Hystrix plugins configuration is ["
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+ "concurrencyStrategy [" + this.delegate + "]," + "eventNotifier ["
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+ eventNotifier + "]," + "metricPublisher [" + metricsPublisher + "],"
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+ "propertiesStrategy [" + propertiesStrategy + "]," + "]");
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log.debug("Registering Sleuth Hystrix Concurrency Strategy.");
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}
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}
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@Override
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public <T> Callable<T> wrapCallable(Callable<T> callable) {
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RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
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return new WrappedCallable<>(callable, requestAttributes);
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}
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@Override
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public ThreadPoolExecutor getThreadPool(HystrixThreadPoolKey threadPoolKey,
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HystrixProperty<Integer> corePoolSize,
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HystrixProperty<Integer> maximumPoolSize,
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HystrixProperty<Integer> keepAliveTime, TimeUnit unit,
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BlockingQueue<Runnable> workQueue) {
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return this.delegate.getThreadPool(threadPoolKey, corePoolSize, maximumPoolSize,
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keepAliveTime, unit, workQueue);
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}
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@Override
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public ThreadPoolExecutor getThreadPool(HystrixThreadPoolKey threadPoolKey,
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HystrixThreadPoolProperties threadPoolProperties) {
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return this.delegate.getThreadPool(threadPoolKey, threadPoolProperties);
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}
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@Override
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public BlockingQueue<Runnable> getBlockingQueue(int maxQueueSize) {
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return this.delegate.getBlockingQueue(maxQueueSize);
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}
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@Override
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public <T> HystrixRequestVariable<T> getRequestVariable(
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HystrixRequestVariableLifecycle<T> rv) {
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return this.delegate.getRequestVariable(rv);
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}
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static class WrappedCallable<T> implements Callable<T> {
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private final Callable<T> target;
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private final RequestAttributes requestAttributes;
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public WrappedCallable(Callable<T> target, RequestAttributes requestAttributes) {
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this.target = target;
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this.requestAttributes = requestAttributes;
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}
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@Override
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public T call() throws Exception {
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try {
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RequestContextHolder.setRequestAttributes(requestAttributes);
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return target.call();
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}
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finally {
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RequestContextHolder.resetRequestAttributes();
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}
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}
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}
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}
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