/**
 * 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.activemq;

import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.atomic.AtomicBoolean;

import junit.framework.TestCase;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Enforces a test case to run for only an allotted time to prevent them from
 * hanging and breaking the whole testing.
 *
 *
 */

public abstract class AutoFailTestSupport extends TestCase {

   public static final int EXIT_SUCCESS = 0;
   public static final int EXIT_ERROR = 1;
   private static final Logger LOG = LoggerFactory.getLogger(AutoFailTestSupport.class);

   private long maxTestTime = 5 * 60 * 1000; // 5 mins by default
   private Thread autoFailThread;

   private boolean verbose = true;
   private boolean useAutoFail; // Disable auto fail by default
   private AtomicBoolean isTestSuccess;

   @Override
   protected void setUp() throws Exception {
      // Runs the auto fail thread before performing any setup
      if (isAutoFail()) {
         startAutoFailThread();
      }
      super.setUp();
   }

   @Override
   protected void tearDown() throws Exception {
      super.tearDown();

      // Stops the auto fail thread only after performing any clean up
      stopAutoFailThread();
   }

   /**
    * Manually start the auto fail thread. To start it automatically, just set
    * the auto fail to true before calling any setup methods. As a rule, this
    * method is used only when you are not sure, if the setUp and tearDown
    * method is propagated correctly.
    */
   public void startAutoFailThread() {
      setAutoFail(true);
      isTestSuccess = new AtomicBoolean(false);
      autoFailThread = new Thread(new Runnable() {
         @Override
         public void run() {
            try {
               // Wait for test to finish successfully
               Thread.sleep(getMaxTestTime());
            } catch (InterruptedException e) {
               // This usually means the test was successful
            } finally {
               // Check if the test was able to tear down successfully,
               // which usually means, it has finished its run.
               if (!isTestSuccess.get()) {
                  LOG.error("Test case has exceeded the maximum allotted time to run of: " + getMaxTestTime() + " ms.");
                  dumpAllThreads(getName());
                  if (System.getProperty("org.apache.activemq.AutoFailTestSupport.disableSystemExit") == null) {
                     System.exit(EXIT_ERROR);
                  } else {
                     LOG.error("No system.exit as it kills surefire - forkedProcessTimeoutInSeconds (surefire.timeout) will kick in eventually see pom.xml surefire plugin config");
                     fail("Timeout in AutoFailTestSupport class has been exceeded");
                  }
               }
            }
         }
      }, "AutoFailThread");

      if (verbose) {
         LOG.info("Starting auto fail thread...");
      }

      LOG.info("Starting auto fail thread...");
      autoFailThread.start();
   }

   /**
    * Manually stops the auto fail thread. As a rule, this method is used only
    * when you are not sure, if the setUp and tearDown method is propagated
    * correctly.
    */
   public void stopAutoFailThread() {
      if (isAutoFail() && autoFailThread != null && autoFailThread.isAlive()) {
         isTestSuccess.set(true);

         if (verbose) {
            LOG.info("Stopping auto fail thread...");
         }

         LOG.info("Stopping auto fail thread...");
         autoFailThread.interrupt();
      }
   }

   /**
    * Sets the auto fail value. As a rule, this should be used only before any
    * setup methods is called to automatically enable the auto fail thread in
    * the setup method of the test case.
    *
    * @param val
    */
   public void setAutoFail(boolean val) {
      this.useAutoFail = val;
   }

   public boolean isAutoFail() {
      return this.useAutoFail;
   }

   /**
    * The assigned value will only be reflected when the auto fail thread has
    * started its run. Value is in milliseconds.
    *
    * @param val
    */
   public void setMaxTestTime(long val) {
      this.maxTestTime = val;
   }

   public long getMaxTestTime() {
      return this.maxTestTime;
   }

   public static void dumpAllThreads(String prefix) {
      Map<Thread, StackTraceElement[]> stacks = Thread.getAllStackTraces();
      for (Entry<Thread, StackTraceElement[]> stackEntry : stacks.entrySet()) {
         System.err.println(prefix + " " + stackEntry.getKey());
         for (StackTraceElement element : stackEntry.getValue()) {
            System.err.println("     " + element);
         }
      }
   }
}
