Package com.splunk.shuttl.archiver.clustering

Source Code of com.splunk.shuttl.archiver.clustering.RemoteShuttl

// Copyright (C) 2011 Splunk Inc.
//
// Splunk Inc. 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.splunk.shuttl.archiver.clustering;

import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import com.amazonaws.util.json.JSONException;
import com.amazonaws.util.json.JSONObject;
import com.splunk.shuttl.ShuttlConstants;
import com.splunk.shuttl.archiver.http.JsonRestEndpointCaller;

/**
* Does REST calls to remote shuttls.
*/
public class RemoteShuttl {

  private JsonRestEndpointCaller restEndpointCaller;

  public RemoteShuttl(JsonRestEndpointCaller restEndpointCaller) {
    this.restEndpointCaller = restEndpointCaller;
  }

  /**
   * @return server name from a Shuttl server.
   */
  public String getServerName(String hostname, int shuttlPort) {
    HttpGet httpGet = constructServerNameRequest(hostname, shuttlPort);
    JSONObject json = restEndpointCaller.getJson(httpGet);
    return getServerNameFromJsonResponse(json);
  }

  private HttpGet constructServerNameRequest(String hostname, int shuttlPort) {
    return new HttpGet("http://" + hostname + ":" + shuttlPort + "/"
        + ShuttlConstants.ENDPOINT_CONTEXT
        + ShuttlConstants.ENDPOINT_SHUTTL_CONFIGURATION
        + ShuttlConstants.ENDPOINT_CONFIG_SERVERNAME);
  }

  private String getServerNameFromJsonResponse(JSONObject jsonObject) {
    try {
      return jsonObject.getString("server_name");
    } catch (JSONException e) {
      throw new RuntimeException(e);
    }
  }

  public static RemoteShuttl create() {
    return new RemoteShuttl(new JsonRestEndpointCaller(new DefaultHttpClient()));
  }
}
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