将RegistryManager改名为RegistryCenter，删除RegistryCenter中没有使用的API，以及完成RegistryCenter的切换center的功能

skywalking-registry/src/main/java/com/a/eye/skywalking/registry/api/Center.java

@@ -0,0 +1,9 @@
+package com.a.eye.skywalking.registry.api;
+
+import java.lang.annotation.*;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE})
+public @interface Center {
+    CenterType type() default CenterType.zookeeper;
+}

skywalking-registry/src/main/java/com/a/eye/skywalking/registry/api/CenterType.java

@@ -0,0 +1,19 @@
+package com.a.eye.skywalking.registry.api;
+
+/**
+ * Created by xin on 2016/11/10.
+ */
+public enum CenterType {
+    zookeeper("zookeeper");
+
+    private String type;
+
+    CenterType(String typeStr) {
+        this.type = typeStr;
+    }
+
+
+    public String getType() {
+        return type;
+    }
+}

skywalking-registry/src/main/java/com/a/eye/skywalking/registry/api/NotifyListener.java

@@ -3,5 +3,5 @@ package com.a.eye.skywalking.registry.api;
 import java.util.List;
 
 public interface NotifyListener {
-    void notify(List<RegistryData> urls);
+    void notify(List<String> urls);
 }

skywalking-registry/src/main/java/com/a/eye/skywalking/registry/api/RegistryCenter.java

@@ -0,0 +1,26 @@
+package com.a.eye.skywalking.registry.api;
+
+/**
+ * 主要用于注册中心的维护
+ */
+public interface RegistryCenter {
+
+    /**
+     * 主要用于storage启动注册使用，将自身IP和端口注册到注册中心
+     * 格式为:
+     * /storage_list/192.168.0.1:3400 NULL
+     *
+     * @param path
+     */
+    void register(String path);
+
+    /**
+     * 主要用于routing节点在启动完成之后，读取和监听stroage节点列表
+     * 格式
+     *
+     * @param path
+     * @param listener
+     */
+    void subscribe(String path, NotifyListener listener);
+
+}

skywalking-registry/src/main/java/com/a/eye/skywalking/registry/api/RegistryCenterFactory.java

@@ -0,0 +1,33 @@
+package com.a.eye.skywalking.registry.api;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.ServiceLoader;
+
+/**
+ * Created by xin on 2016/11/10.
+ */
+public class RegistryCenterFactory {
+
+    private Map<CenterType, RegistryCenter> registryCenter = new HashMap<CenterType, RegistryCenter>();
+
+    private RegistryCenterFactory() {
+        ServiceLoader<RegistryCenter> loaders = ServiceLoader.load(RegistryCenter.class);
+        Iterator<RegistryCenter> iterator = loaders.iterator();
+        while (iterator.hasNext()) {
+            RegistryCenter center = iterator.next();
+            Center centerInfo = center.getClass().getAnnotation(Center.class);
+            if (centerInfo == null) {
+                continue;
+            }
+
+            registryCenter.put(centerInfo.type(), center);
+
+        }
+    }
+
+    public RegistryCenter getRegistryCenter(CenterType type) {
+        return registryCenter.get(type);
+    }
+}

skywalking-registry/src/main/java/com/a/eye/skywalking/registry/api/RegistryData.java

@@ -1,12 +0,0 @@
-package com.a.eye.skywalking.registry.api;
-
-/**
- * 存储注册项的数据
- * 注册项包括：注册的目录（支持多级，以"/"分割）以及注册值
- */
-public interface RegistryData {
-
-    String getPath();
-
-    String getValue();
-}

skywalking-registry/src/main/java/com/a/eye/skywalking/registry/api/RegistryManager.java

@@ -1,40 +0,0 @@
-package com.a.eye.skywalking.registry.api;
-
-/**
- * 主要用于注册中心的维护
- */
-public interface RegistryManager {
-
-    /**
-     * 主要用于storage启动注册使用，将自身IP和端口注册到注册中心
-     * 格式为:
-     * /storage_list/192.168.0.1:3400 NULL
-     *
-     * @param data
-     */
-    void register(RegistryData data);
-
-    /**
-     * 从注册中心移除storage宕机节点
-     *
-     * @param data
-     */
-    void unregister(RegistryData data);
-
-    /**
-     * 主要用于routing节点在启动完成之后，读取和监听stroage节点列表
-     * 格式
-     *
-     * @param data
-     * @param listener
-     */
-    void subscribe(RegistryData data, NotifyListener listener);
-
-    /**
-     * 移除storage节点监听
-     *
-     * @param data
-     */
-    void unsubscribe(RegistryData data);
-
-}