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src/main/java/cn/com/qmth/examcloud/web/cloud/ExamCloudDiscoveryClient.java

@@ -0,0 +1,67 @@
+package cn.com.qmth.examcloud.web.cloud;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.commons.collections.CollectionUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cloud.client.ServiceInstance;
+import org.springframework.cloud.client.discovery.DiscoveryClient;
+import org.springframework.stereotype.Component;
+
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.collect.Lists;
+
+import cn.com.qmth.examcloud.commons.exception.ExamCloudRuntimeException;
+
+/**
+ * 注册中心客户端
+ *
+ * @author WANGWEI
+ * @date 2019年5月28日
+ * @Copyright (c) 2018-? http://qmth.com.cn All Rights Reserved.
+ */
+@Component
+public class ExamCloudDiscoveryClient {
+
+	@Autowired(required = false)
+	private DiscoveryClient discoveryClient;
+
+	private Cache<String, List<String>> cache = CacheBuilder.newBuilder().maximumSize(100)
+			.expireAfterWrite(1, TimeUnit.MINUTES).concurrencyLevel(10).recordStats().build();
+
+	/**
+	 * 获取实例的URL
+	 *
+	 * @author WANGWEI
+	 * @param appName
+	 * @return
+	 */
+	public String getInstanceUrl(String appName) {
+
+		List<String> urlList = cache.getIfPresent(appName);
+		if (CollectionUtils.isNotEmpty(urlList)) {
+			String url = urlList.get(0);
+			return url;
+		}
+		urlList = Lists.newArrayList();
+
+		List<ServiceInstance> instances = discoveryClient.getInstances(appName);
+		if (instances.isEmpty()) {
+			throw new ExamCloudRuntimeException("no instance!");
+		}
+
+		for (ServiceInstance serviceInstance : instances) {
+			String host = serviceInstance.getHost();
+			int port = serviceInstance.getPort();
+			String url = "http://" + host + ":" + port;
+			urlList.add(url);
+		}
+		cache.put(appName, urlList);
+
+		String url = urlList.get(0);
+		return url;
+	}
+
+}