/*
    * 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.omid.examples;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.omid.transaction.RollbackException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.Random;
  
  /**
   * ****************************************************************************************************************
   *
   * Same as SnapshotIsolationExample only executes multiple transactions concurrently
   *
   * ****************************************************************************************************************
   *
   * Please @see{SnapshotIsolationExample}
   */
  public class ParallelExecution {
  
      private static final Logger LOG = LoggerFactory.getLogger(ParallelExecution.class);
      private static final long heartBeatInterval = 10_000;
  
      public static void main(String[] args) throws Exception {
  
          LOG.info("Parsing the command line arguments");
          int maxThreads = Runtime.getRuntime().availableProcessors();
          if (args != null && args.length > 2 && StringUtils.isNotEmpty(args[2])) {
              maxThreads = Integer.parseInt(args[2]);
          }
          LOG.info("Execute '{}' concurrent threads", maxThreads);
  
          for (int i = 0; i < maxThreads; i++) {
              final SnapshotIsolationExample example = new SnapshotIsolationExample(args);
              example.setRowIdGenerator(new RandomRowIdGenerator());
              Thread t = new Thread(new Runnable() {
                  @Override
                  public void run() {
                      long lastHeartBeatTime = System.currentTimeMillis();
                      long counter = 0;
                      long errorCounter = 0;
                      while (true) {
                          LOG.info("New cycle starts");
                          try {
                              example.execute();
                              counter++;
                          } catch (IOException | RollbackException | IllegalStateException e) {
                              LOG.error("", e);
                              errorCounter++;
                          }
                          if (System.currentTimeMillis() > lastHeartBeatTime + heartBeatInterval) {
                              LOG.error(String.format("%s cycles executed, %s errors", counter, errorCounter));
                              lastHeartBeatTime = System.currentTimeMillis();
                          }
                      }
                  }
              });
              t.setName(String.format("SnapshotIsolationExample thread %s/%s", i + 1, maxThreads));
              t.start();
          }
  
      }
  
      private static class RandomRowIdGenerator implements RowIdGenerator {
  
          private Random random = new Random();
  
          @Override
          public byte[] getRowId() {
              return Bytes.toBytes("id" + random.nextInt());
          }
      }
  
  
  }