/*
 * 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.jdo.tck.query.jdoql;

import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.jdo.PersistenceManager;
import javax.jdo.Query;
import javax.jdo.Transaction;
import org.apache.jdo.tck.pc.mylib.PCPoint;
import org.apache.jdo.tck.util.BatchTestRunner;
import org.apache.jdo.tck.util.ThreadExceptionHandler;

/**
 * <B>Title:</B> Executing Multiple Queries Simultaneously is ThreadSafe <br>
 * <B>Keywords:</B> query concurrency <br>
 * <B>Assertion ID:</B> A14.3-2. <br>
 * <B>Assertion Description: </B> Multiple queries might be executed simultaneously by different
 * threads (but the implementation might choose to execute them serially). In either case, the
 * execution must be thread safe.
 */
public class ExecutingMultipleQueriesSimultaneouslyIsThreadSafe
    extends MultipleActiveQueryInstanceInSamePersistenceManager {

  static final int NR_OF_THREADS = 20;

  /** */
  private static final String ASSERTION_FAILED =
      "Assertion A14.3-2 (ExecutingMultipleQueriesSimultaneouslyIsThreadSafe) failed: ";

  /**
   * The <code>main</code> is called when the class is directly executed from the command line.
   *
   * @param args The arguments passed to the program.
   */
  public static void main(String[] args) {
    BatchTestRunner.run(ExecutingMultipleQueriesSimultaneouslyIsThreadSafe.class);
  }

  /** */
  @Override
  public void testPositive() {
    PersistenceManager pm = getPM();
    Transaction tx = pm.currentTransaction();
    try {
      tx.begin();

      if (debug)
        logger.debug(getThreadName() + ": Starting " + NR_OF_THREADS + " concurrent threads.");
      ThreadExceptionHandler group = new ThreadExceptionHandler();
      Thread[] threads = new Thread[NR_OF_THREADS];
      for (int i = 0; i < NR_OF_THREADS; i++) {
        // Runnable r = new QueryExecuter(pm);
        Runnable r = new ExecutingMultipleQueriesSimultaneouslyIsThreadSafe().getQueryExecuter(pm);
        Thread t = new Thread(group, r);
        t.setName("ThreadID-" + i);
        threads[i] = t;
        if (debug) logger.debug(getThreadName() + ": Running");
        t.start();
      }

      if (debug) logger.debug(getThreadName() + ": Waiting for threads to join...");
      for (int i = 0; i < NR_OF_THREADS; i++) {
        try {
          threads[i].join();
        } catch (InterruptedException ignored) {
        }
      }
      if (debug) logger.debug(getThreadName() + ": All threads joined.");

      tx.commit();
      tx = null;

      // check unhandled exceptions
      Set<Map.Entry<Thread, Throwable>> uncaught = group.getAllUncaughtExceptions();
      if ((uncaught != null) && !uncaught.isEmpty()) {
        for (Map.Entry<Thread, Throwable> next : uncaught) {
          Thread thread = next.getKey();
          Throwable problem = next.getValue();
          if (debug) {
            logger.debug("uncaught exception in thread " + thread + " stacktrace:");
            problem.printStackTrace();
          }
          fail(ASSERTION_FAILED, "Thread " + thread + ": uncaught exception " + problem);
        }
      }
    } finally {
      if ((tx != null) && tx.isActive()) tx.rollback();
    }
  }

  /** */
  String getThreadName() {
    return "[" + Thread.currentThread().getName() + "]";
  }

  /** Will be removed. */
  Runnable getQueryExecuter(PersistenceManager pm) {
    return new QueryExecuter(pm);
  }

  /** Will be removed. */
  @Override
  void executeQueries(PersistenceManager ignore) {
    pm = getPM();
    setInsertedObjects(pm);
    super.executeQueries(pm);
    pm.close();
    pm = null;
  }

  /** Will be removed. */
  void setInsertedObjects(PersistenceManager pm) {
    Transaction tx = pm.currentTransaction();
    try {
      tx.begin();
      Query<PCPoint> query = pm.newQuery(PCPoint.class);
      query.setCandidates(pm.getExtent(PCPoint.class, false));
      List<PCPoint> results = query.executeList();
      for (PCPoint result : results) {
        inserted.add(result);
      }
      tx.commit();
      tx = null;
    } finally {
      if ((tx != null) && tx.isActive()) tx.rollback();
    }
  }

  /** */
  class QueryExecuter implements Runnable {

    final PersistenceManager pm;

    /** */
    public QueryExecuter(PersistenceManager pm) {
      this.pm = pm;
    }

    /** */
    public void run() {
      ExecutingMultipleQueriesSimultaneouslyIsThreadSafe.this.executeQueries(pm);
    }
  }

  /**
   * @see org.apache.jdo.tck.JDO_Test#localSetUp()
   */
  @Override
  protected void localSetUp() {
    addTearDownClass(PCPoint.class);
    loadAndPersistPCPoints(getPM());
  }
}