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 org.apache.bigtop.bigpetstore.qstream;
  
  import org.apache.bigtop.datagenerators.bigpetstore.datamodels.Transaction;
  import org.apache.http.HttpResponse;
  
  import java.net.URL;
  import java.net.URLEncoder;
  import java.util.Stack;
  import java.util.concurrent.LinkedBlockingQueue;
  
  
  /**
   * HTTP Consumer.  provides a write queue and empties it every so often.
   * TODO, make the queue size configurable.
   */
  public class HttpLoadGen extends LoadGen {
  
      String path; // i.e.  "http://localhost:3000";
  
      public HttpLoadGen(int nStores, int nCustomers, double simulationLength, long seed, URL u) throws Throwable{
          super(nStores, nCustomers, simulationLength, seed);
          path=u.toString();
      }
  
      /**
       * Appends via REST calls.
       */
      public LinkedBlockingQueue<Transaction> startWriteQueue(final int milliseconds) {
          /**
           * Write queue.   Every 5 seconds, write
           */
          final LinkedBlockingQueue<Transaction> transactionQueue = new LinkedBlockingQueue<Transaction>(getQueueSize());
          new Thread() {
              @Override
              public void run() {
                  int fileNumber = 0;
                  while (true) {
                      waitFor(milliseconds, transactionQueue);
                      System.out.println("CLEARING " + transactionQueue.size() + " elements from queue.");
                      Stack<Transaction> transactionsToWrite = new Stack<Transaction>();
  
                      transactionQueue.drainTo(transactionsToWrite);
  
                      /**
                       * pop transactions from the queue, and sent them over http as json.
                       */
                      while (!transactionsToWrite.isEmpty()) {
                          try {
                              String trAsJson = URLEncoder.encode(Utils.toJson(transactionsToWrite.pop()));
  
                              /**
                               * i.e. wget http://localhost:3000/rpush/guestbook/{"name":"cos boudnick", "state":"...",...}
                               */
                              HttpResponse resp=Utils.get(path + "/" + trAsJson);
                              if(total%20==0) System.out.println("wrote customer " + trAsJson);
                              total++;
                          }
                          catch (Throwable t) {
                              System.err.println("transaction failed.... !");
                              t.printStackTrace();
                          }
                          System.out.println("TRANSACTIONS SO FAR " + total++ + " RATE " + total / ((System.currentTimeMillis() - startTime) / 1000));
                      }
                  }
              }
          }.start();
  
          return transactionQueue;
      }
  }
  