/*
    * 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.benchmarks.tso;
  
  import org.apache.phoenix.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.Closeable;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.Executors;
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.TimeUnit;
  
  /**
   * Benchmark using directly TSOClient to connect to the TSO Server
   */
  public class TSOServerBenchmark implements Closeable {
  
      private static final Logger LOG = LoggerFactory.getLogger(TSOServerBenchmark.class);
  
      private volatile boolean isCleaningDone = false;
  
      private final TSOServerBenchmarkConfig expConfig;
  
      // Clients triggering txs (threads) & corresponding executor
      private final ArrayList<RawTxRunner> txRunners = new ArrayList<>();
      private final ScheduledExecutorService txRunnerExec;
  
      private TSOServerBenchmark(TSOServerBenchmarkConfig expConfig) throws IOException {
  
          this.expConfig = expConfig;
  
          // Executor for TxRunners (Clients triggering transactions)
          Thread.UncaughtExceptionHandler uncaughtExceptionHandler = new Thread.UncaughtExceptionHandler() {
              @Override
              public void uncaughtException(Thread t, Throwable e) {
                  LOG.error("Thread {} threw exception", t, e);
              }
          };
          ThreadFactoryBuilder threadFactoryBuilder = new ThreadFactoryBuilder()
                  .setNameFormat("tx-runner-%d")
                  .setUncaughtExceptionHandler(uncaughtExceptionHandler);
          this.txRunnerExec = Executors.newScheduledThreadPool(expConfig.getTxRunners(), threadFactoryBuilder.build());
  
      }
  
      public static void main(String[] args) throws Exception {
  
          final TSOServerBenchmarkConfig config = new TSOServerBenchmarkConfig();
  
          final int nOfTxRunners = config.getTxRunners();
  
          final long benchmarkRunLengthInMins = config.getBenchmarkRunLengthInMins();
  
          try (TSOServerBenchmark tsoBenchmark = new TSOServerBenchmark(config)) {
  
              tsoBenchmark.attachShutDownHook();
  
              LOG.info("----- Starting TSO Benchmark [ {} TxRunner clients ] -----", nOfTxRunners);
  
              for (int i = 0; i < nOfTxRunners; ++i) {
                  tsoBenchmark.createTxRunner();
              }
  
              LOG.info("Benchmark run lenght {} Mins", benchmarkRunLengthInMins);
              TimeUnit.MINUTES.sleep(benchmarkRunLengthInMins);
  
          } finally {
              LOG.info("----- TSO Benchmark complete - Check metrics from individual clients in log -----");
          }
  
      }
  
      private void attachShutDownHook() {
          Runtime.getRuntime().addShutdownHook(new Thread("benchmark-cleaner") {
              @Override
              public void run() {
                  if (!isCleaningDone) {
                      close();
                  }
              }
         });
         LOG.info("Shutdown Hook Attached");
     }
 
     private void createTxRunner() throws IOException, InterruptedException, ExecutionException {
 
         RawTxRunner txRunner = new RawTxRunner(expConfig);
         txRunnerExec.submit(txRunner);
 
         txRunners.add(txRunner);
 
     }
 
     @Override
     public void close() {
 
         // Stop clients
         for (RawTxRunner txRunner : txRunners) {
             txRunner.stop();
         }
 
         // Shutdown executor
         try {
             LOG.info("Closing TxRunner Executor in 10 secs");
             boolean wasSuccess = txRunnerExec.awaitTermination(10, TimeUnit.SECONDS);
             if (!wasSuccess) {
                 txRunnerExec.shutdownNow();
             }
         } catch (InterruptedException e) {
             Thread.currentThread().interrupt();
             LOG.info("Interrupted whilst shutting down TxRunner Executor!");
         } finally {
             LOG.info("TxRunner Executor stopped");
         }
 
         isCleaningDone = true;
     }
 
 }