APIRelationDefFactory.java

//package com.zillabyte.motherbrain.relational;
//
//import java.util.concurrent.Callable;
//
//import net.sf.json.JSONObject;
//
//import org.apache.commons.lang.mutable.MutableBoolean;
//
//import com.zillabyte.motherbrain.api.APIException;
//import com.zillabyte.motherbrain.api.RelationsHelper;
//import com.zillabyte.motherbrain.flow.config.FlowConfig;
//import com.zillabyte.motherbrain.utils.Utils;
//
//public class APIRelationDefFactory extends RelationDefFactory {
//
//
//  /**
//   * 
//   */
//  private static final long serialVersionUID = 4377049071457885406L;
//
//  @Override
//  public JSONObject getFromAPI(final FlowConfig config, final String relationName, final ColumnDef... columns) throws APIException, InterruptedException, RelationException {
//    try { 
//        
//      final MutableBoolean relationAbsent = new MutableBoolean(false);
//      
//      // There's a race condition here, and we're lazy so just retry a few times... 
//      JSONObject mappings = Utils.retry(3, new Callable<JSONObject>() {
//        @Override
//        public JSONObject call() throws Exception {
//  
//          relationAbsent.setValue(false);
//          JSONObject ret = RelationsHelper.instance().getRelationConfig(config, relationName);
//  
//          if (ret.containsKey("error")) {
//            relationAbsent.setValue(true);
//            // Doctor, we need a relation, and fast!
//            ret = RelationsHelper.instance().postRelationConfigForNextVersion(config, relationName, columns);
//            if (ret.containsKey("error")) {
//              // Alas, it was not to be.
//              throw new APIException("api returned error! " + ret.toString());
//            }
//          }
//          
//          return ret;
//        }
//      });
//      
//
//      return mappings;
//    } catch(Exception e) {
//      throw new APIException(e);
//    }
//  }
//}