Implement Admin Region metrics

src/main/java/com/alipay/oceanbase/hbase/execute/AbstractObTableMetaExecutor.java

@@ -0,0 +1,31 @@
+package com.alipay.oceanbase.hbase.execute;
+
+import com.alipay.oceanbase.rpc.ObTableClient;
+import com.alipay.oceanbase.rpc.exception.ObTableException;
+import com.alipay.oceanbase.rpc.meta.ObTableMetaRequest;
+import com.alipay.oceanbase.rpc.meta.ObTableMetaResponse;
+import com.alipay.oceanbase.rpc.table.ObTable;
+
+import java.io.IOException;
+
+public abstract class AbstractObTableMetaExecutor<T> implements ObTableMetaExecutor<T> {
+
+    @Override
+    public T execute(ObTableClient client, ObTableMetaRequest request) throws IOException {
+        if (request.getMetaType() != getMetaType()) {
+            throw new IOException("Invalid meta type, expected " + getMetaType());
+        }
+        ObTable table = client.getRandomTable();
+        ObTableMetaResponse response;
+        try {
+            response = (ObTableMetaResponse) client.executeWithRetry(
+                    table,
+                    request,
+                    null /*tableName*/
+            );
+        } catch (Exception e) {
+            throw new IOException("Failed to execute request", e);
+        }
+        return parse(response);
+    }
+}

src/main/java/com/alipay/oceanbase/hbase/execute/ObTableMetaExecutor.java

@@ -0,0 +1,32 @@
+package com.alipay.oceanbase.hbase.execute;
+
+import com.alipay.oceanbase.rpc.ObTableClient;
+import com.alipay.oceanbase.rpc.meta.ObTableMetaRequest;
+import com.alipay.oceanbase.rpc.meta.ObTableMetaResponse;
+import com.alipay.oceanbase.rpc.meta.ObTableRpcMetaType;
+
+import java.io.IOException;
+
+public interface ObTableMetaExecutor<T> {
+    /**
+     * 执行元数据请求
+     * @param request 元数据请求
+     * @return 解析后的元数据对象
+     * @throws IOException 如果执行失败或解析失败
+     */
+    T execute(ObTableClient client, ObTableMetaRequest request) throws IOException;
+
+    /**
+     * 解析元数据响应, 用户需要重写
+     * @param response 元数据响应
+     * @return 解析后的元数据对象
+     * @throws IOException 如果解析失败
+     */
+    T parse(ObTableMetaResponse response) throws IOException;
+
+    /**
+     * 获取元信息类型, 用户需要重写
+     * @return 元信息类型
+     */
+    ObTableRpcMetaType getMetaType() throws IOException;
+}