optimize: optimize SeataHystrixConcurrencyStrategy

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-seata/src/main/java/com/alibaba/cloud/seata/feign/hystrix/SeataHystrixConcurrencyStrategy.java

@@ -16,23 +16,93 @@
 
 package com.alibaba.cloud.seata.feign.hystrix;
 
+import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.Callable;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
 
+import com.netflix.hystrix.HystrixThreadPoolKey;
+import com.netflix.hystrix.HystrixThreadPoolProperties;
 import com.netflix.hystrix.strategy.HystrixPlugins;
 import com.netflix.hystrix.strategy.concurrency.HystrixConcurrencyStrategy;
+import com.netflix.hystrix.strategy.concurrency.HystrixRequestVariable;
+import com.netflix.hystrix.strategy.concurrency.HystrixRequestVariableLifecycle;
+import com.netflix.hystrix.strategy.eventnotifier.HystrixEventNotifier;
+import com.netflix.hystrix.strategy.executionhook.HystrixCommandExecutionHook;
+import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisher;
+import com.netflix.hystrix.strategy.properties.HystrixPropertiesStrategy;
+import com.netflix.hystrix.strategy.properties.HystrixProperty;
 import io.seata.core.context.RootContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.springframework.web.context.request.RequestAttributes;
+import org.springframework.web.context.request.RequestContextHolder;
 
 /**
  * @author xiaojing
  */
 public class SeataHystrixConcurrencyStrategy extends HystrixConcurrencyStrategy {
 
+	private final Logger logger = LoggerFactory.getLogger(SeataHystrixConcurrencyStrategy.class);
 	private HystrixConcurrencyStrategy delegate;
 
 	public SeataHystrixConcurrencyStrategy() {
+		try {
 			this.delegate = HystrixPlugins.getInstance().getConcurrencyStrategy();
+			if (this.delegate instanceof SeataHystrixConcurrencyStrategy) {
+				return;
+			}
+			HystrixCommandExecutionHook commandExecutionHook = HystrixPlugins.getInstance().getCommandExecutionHook();
+			HystrixEventNotifier eventNotifier = HystrixPlugins.getInstance().getEventNotifier();
+			HystrixMetricsPublisher metricsPublisher = HystrixPlugins.getInstance().getMetricsPublisher();
+			HystrixPropertiesStrategy propertiesStrategy = HystrixPlugins.getInstance().getPropertiesStrategy();
+			logCurrentStateOfHystrixPlugins(eventNotifier, metricsPublisher, propertiesStrategy);
 			HystrixPlugins.reset();
 			HystrixPlugins.getInstance().registerConcurrencyStrategy(this);
+			HystrixPlugins.getInstance().registerCommandExecutionHook(commandExecutionHook);
+			HystrixPlugins.getInstance().registerEventNotifier(eventNotifier);
+			HystrixPlugins.getInstance().registerMetricsPublisher(metricsPublisher);
+			HystrixPlugins.getInstance().registerPropertiesStrategy(propertiesStrategy);
+		} catch (Exception ex) {
+			logger.error("Failed to register Seata Hystrix Concurrency Strategy", ex);
+		}
+	}
+
+	private void logCurrentStateOfHystrixPlugins(HystrixEventNotifier eventNotifier,
+												 HystrixMetricsPublisher metricsPublisher,
+												 HystrixPropertiesStrategy propertiesStrategy) {
+		if (logger.isDebugEnabled()) {
+			logger.debug("Current Hystrix plugins configuration is [" + "concurrencyStrategy [" + this.delegate + "],"
+				+ "eventNotifier [" + eventNotifier + "]," + "metricPublisher [" + metricsPublisher + "],"
+				+ "propertiesStrategy [" + propertiesStrategy + "]," + "]");
+			logger.debug("Registering Seata Hystrix Concurrency Strategy.");
+		}
+	}
+
+	@Override
+	public ThreadPoolExecutor getThreadPool(HystrixThreadPoolKey threadPoolKey, HystrixProperty<Integer> corePoolSize,
+											HystrixProperty<Integer> maximumPoolSize,
+											HystrixProperty<Integer> keepAliveTime, TimeUnit unit,
+											BlockingQueue<Runnable> workQueue) {
+		return this.delegate.getThreadPool(threadPoolKey, corePoolSize, maximumPoolSize, keepAliveTime, unit,
+			workQueue);
+	}
+
+	@Override
+	public ThreadPoolExecutor getThreadPool(HystrixThreadPoolKey threadPoolKey,
+											HystrixThreadPoolProperties threadPoolProperties) {
+		return this.delegate.getThreadPool(threadPoolKey, threadPoolProperties);
+	}
+
+	@Override
+	public BlockingQueue<Runnable> getBlockingQueue(int maxQueueSize) {
+		return this.delegate.getBlockingQueue(maxQueueSize);
+	}
+
+	@Override
+	public <T> HystrixRequestVariable<T> getRequestVariable(HystrixRequestVariableLifecycle<T> rv) {
+		return this.delegate.getRequestVariable(rv);
 	}
 
 	@Override
@@ -44,15 +114,14 @@ public class SeataHystrixConcurrencyStrategy extends HystrixConcurrencyStrategy
 		Callable<K> wrappedCallable;
 		if (this.delegate != null) {
 			wrappedCallable = this.delegate.wrapCallable(c);
-		}
-		else {
+		} else {
 			wrappedCallable = c;
 		}
 		if (wrappedCallable instanceof SeataContextCallable) {
 			return wrappedCallable;
 		}
 
-		return new SeataContextCallable<>(wrappedCallable);
+		return new SeataContextCallable<>(wrappedCallable, RequestContextHolder.getRequestAttributes());
 	}
 
 	private static class SeataContextCallable<K> implements Callable<K> {
@@ -61,19 +130,23 @@ public class SeataHystrixConcurrencyStrategy extends HystrixConcurrencyStrategy
 
 		private final String xid;
 
-		SeataContextCallable(Callable<K> actual) {
+		private final RequestAttributes requestAttributes;
+
+		SeataContextCallable(Callable<K> actual, RequestAttributes requestAttribute) {
 			this.actual = actual;
+			this.requestAttributes = requestAttribute;
 			this.xid = RootContext.getXID();
 		}
 
 		@Override
 		public K call() throws Exception {
 			try {
+				RequestContextHolder.setRequestAttributes(requestAttributes);
 				RootContext.bind(xid);
 				return actual.call();
-			}
-			finally {
+			} finally {
 				RootContext.unbind();
+				RequestContextHolder.resetRequestAttributes();
 			}
 		}