content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  package com.alicloud.openservices.tablestore.core.auth;
  
  import com.alicloud.openservices.tablestore.ClientException;
  import com.alicloud.openservices.tablestore.core.utils.HttpRequest;
  import com.alicloud.openservices.tablestore.core.utils.HttpResponse;
  
  import java.io.IOException;
  import java.net.URL;
  
  public interface CredentialsFetcher {
  
      /**
       * Construct the authorization server URL
       * 
       * @return the URL of the authorization server
       * @throws ClientException
       */
      public URL buildUrl() throws ClientException;
  
      /**
       * Sends an HTTP request to the authorization server
       *
       * @param request
       *            HTTP request
       * @return HTTP response
       * @throws IOException
       */
      public HttpResponse send(HttpRequest request) throws IOException;
  
      /**
       * Parse the authorization information returned by the authorization server and convert it into Credentials
       * 
       * @param response
       *            Authorization information returned by the authorization server
       * @return
       * @throws ClientException
       */
      public ServiceCredentials parse(HttpResponse response) throws ClientException;
  
      /**
       * Obtain authorization from the authorization server
       * 
       * @return credentials
       * @throws ClientException
       */
      public ServiceCredentials fetch() throws ClientException;
  
      /**
       * Obtain authorization from the authorization server
       * 
       * @param retryTimes
       *            retry times on failure
       * @return credentials
       * @throws ClientException
       */
      public ServiceCredentials fetch(int retryTimes) throws ClientException;
  }
  