心跳注册和结果回调，重试逻辑优化

doc/XXL-JOB官方文档.md

 - 4、执行器集群地址列表进行自然排序；
 - 5、调度中心，DAO层代码精简优化并且新增测试用例覆盖；
 - 6、调度中心API服务改为自研RPC形式，统一底层通讯模型；
+- 7、新增调度中心API服务测试Demo，方便在调度中心API扩展和测试；
 
 #### TODO LIST
 - 1、任务权限管理：执行器为粒度分配权限，核心操作校验权限；

xxl-job-admin/src/main/java/com/xxl/job/admin/controller/JobApiController.java

 package com.xxl.job.admin.controller;
 
 import com.xxl.job.admin.controller.annotation.PermessionLimit;
+import com.xxl.job.core.biz.AdminBiz;
 import com.xxl.job.core.rpc.codec.RpcRequest;
 import com.xxl.job.core.rpc.codec.RpcResponse;
 import com.xxl.job.core.rpc.netcom.NetComServerFactory;
         }
     }
 
-    @RequestMapping("/api")
+    @RequestMapping(AdminBiz.MAPPING)
     @PermessionLimit(limit=false)
     public void api(HttpServletRequest request, HttpServletResponse response) throws IOException {
 

xxl-job-admin/src/main/java/com/xxl/job/admin/controller/JobLogController.java

 import com.xxl.job.core.rpc.netcom.NetComClientProxy;
 import org.apache.commons.lang.StringUtils;
 import org.apache.commons.lang.time.DateUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.RequestMapping;
 @Controller
 @RequestMapping("/joblog")
 public class JobLogController {
+	private static Logger logger = LoggerFactory.getLogger(JobLogController.class);
 
 	@Resource
 	private XxlJobGroupDao xxlJobGroupDao;
 
 			return logResult;
 		} catch (Exception e) {
-			e.printStackTrace();
+			logger.error(e.getMessage(), e);
 			return new ReturnT<LogResult>(ReturnT.FAIL_CODE, e.getMessage());
 		}
 	}
 		}
 
 		// request of kill
-		ExecutorBiz executorBiz = null;
+		ReturnT<String> runResult = null;
 		try {
-			executorBiz = (ExecutorBiz) new NetComClientProxy(ExecutorBiz.class, log.getExecutorAddress()).getObject();
+			ExecutorBiz executorBiz = (ExecutorBiz) new NetComClientProxy(ExecutorBiz.class, log.getExecutorAddress()).getObject();
+			runResult = executorBiz.kill(jobInfo.getId());
 		} catch (Exception e) {
-			e.printStackTrace();
-			return new ReturnT<String>(500, e.getMessage());
+			logger.error(e.getMessage(), e);
+			runResult = new ReturnT<String>(500, e.getMessage());
 		}
-		ReturnT<String> runResult = executorBiz.kill(jobInfo.getId());
 
 		if (ReturnT.SUCCESS_CODE == runResult.getCode()) {
 			log.setHandleCode(ReturnT.FAIL_CODE);

xxl-job-admin/src/main/java/com/xxl/job/admin/core/route/ExecutorRouter.java

             ExecutorBiz executorBiz = (ExecutorBiz) new NetComClientProxy(ExecutorBiz.class, address).getObject();
             runResult = executorBiz.run(triggerParam);
         } catch (Exception e) {
-            logger.error("", e);
+            logger.error(e.getMessage(), e);
             runResult = new ReturnT<String>(ReturnT.FAIL_CODE, ""+e );
         }
 

xxl-job-admin/src/test/java/com/xxl/job/dao/impl/AdminBizTest.java

+package com.xxl.job.dao.impl;
+
+import com.xxl.job.core.biz.AdminBiz;
+import com.xxl.job.core.biz.model.RegistryParam;
+import com.xxl.job.core.biz.model.ReturnT;
+import com.xxl.job.core.enums.RegistryConfig;
+import com.xxl.job.core.rpc.netcom.NetComClientProxy;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * admin-api client, test
+ * @author xuxueli 2017-07-28 22:14:52
+ */
+public class AdminBizTest {
+
+    @Test
+    public void registryTest() throws Exception {
+
+        // admin-client
+        String addressUrl = "http://127.0.0.1:8080/xxl-job-admin".concat(AdminBiz.MAPPING);
+        AdminBiz adminBiz = (AdminBiz) new NetComClientProxy(AdminBiz.class, addressUrl).getObject();
+
+        // test executor registry
+        RegistryParam registryParam = new RegistryParam(RegistryConfig.RegistType.EXECUTOR.name(), "xxl-job-executor-example", "127.0.0.1:9999");
+        ReturnT<String> returnT = adminBiz.registry(registryParam);
+        Assert.assertTrue(returnT.getCode() == ReturnT.SUCCESS_CODE);
+
+    }
+
+}

xxl-job-core/src/main/java/com/xxl/job/core/biz/AdminBiz.java

  */
 public interface AdminBiz {
 
+    public static final String MAPPING = "/api";
+
     /**
      * callback
      *

xxl-job-core/src/main/java/com/xxl/job/core/executor/XxlJobExecutor.java

         if (adminAddresses!=null && adminAddresses.trim().length()>0) {
             for (String address: adminAddresses.trim().split(",")) {
                 if (address!=null && address.trim().length()>0) {
-                    String addressUrl = address.concat("/api");
+                    String addressUrl = address.concat(AdminBiz.MAPPING);
                     AdminBiz adminBiz = (AdminBiz) new NetComClientProxy(AdminBiz.class, addressUrl).getObject();
                     if (adminBizList == null) {
                         adminBizList = new ArrayList<AdminBiz>();

xxl-job-executor-example/src/test/java/com/xxl/executor/test/DemoJobHandlerTest.java

 import com.xxl.job.core.rpc.netcom.NetComClientProxy;
 
 /**
+ * executor-api client, test
+ *
  * Created by xuxueli on 17/5/12.
  */
 public class DemoJobHandlerTest {