/**
 * 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.broker.scheduler;

import java.io.File;
import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import org.apache.activemq.store.kahadb.scheduler.JobSchedulerStoreImpl;
import org.apache.activemq.util.ByteSequence;
import org.apache.activemq.util.IOHelper;
import org.apache.activemq.util.Wait;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class JobSchedulerStoreCheckpointTest {

   static final Logger LOG = LoggerFactory.getLogger(JobSchedulerStoreCheckpointTest.class);

   private JobSchedulerStoreImpl store;
   private JobScheduler scheduler;
   private ByteSequence payload;

   @Before
   public void setUp() throws Exception {
      File directory = new File("target/test/ScheduledJobsDB");
      IOHelper.mkdirs(directory);
      IOHelper.deleteChildren(directory);
      startStore(directory);

      byte[] data = new byte[8192];
      for (int i = 0; i < data.length; ++i) {
         data[i] = (byte) (i % 256);
      }

      payload = new ByteSequence(data);
   }

   protected void startStore(File directory) throws Exception {
      store = new JobSchedulerStoreImpl();
      store.setDirectory(directory);
      store.setCheckpointInterval(5000);
      store.setCleanupInterval(10000);
      store.setJournalMaxFileLength(10 * 1024);
      store.start();
      scheduler = store.getJobScheduler("test");
      scheduler.startDispatching();
   }

   private int getNumJournalFiles() throws IOException {
      return store.getJournal().getFileMap().size();
   }

   @After
   public void tearDown() throws Exception {
      scheduler.stopDispatching();
      store.stop();
   }

   @Test
   public void test() throws Exception {
      final int COUNT = 10;
      final CountDownLatch latch = new CountDownLatch(COUNT);
      scheduler.addListener(new JobListener() {
         @Override
         public void scheduledJob(String id, ByteSequence job) {
            latch.countDown();
         }
      });

      long time = TimeUnit.SECONDS.toMillis(30);
      for (int i = 0; i < COUNT; i++) {
         scheduler.schedule("id" + i, payload, "", time, 0, 0);
      }

      int size = scheduler.getAllJobs().size();
      assertEquals(size, COUNT);

      LOG.info("Number of journal log files: {}", getNumJournalFiles());
      // need a little slack so go over 60 seconds
      assertTrue(latch.await(70, TimeUnit.SECONDS));
      assertEquals(0, latch.getCount());

      for (int i = 0; i < COUNT; i++) {
         scheduler.schedule("id" + i, payload, "", time, 0, 0);
      }

      LOG.info("Number of journal log files: {}", getNumJournalFiles());
      // need a little slack so go over 60 seconds
      assertTrue(latch.await(70, TimeUnit.SECONDS));
      assertEquals(0, latch.getCount());

      assertTrue("Should be only one log left: " + getNumJournalFiles(), Wait.waitFor(new Wait.Condition() {

         @Override
         public boolean isSatisified() throws Exception {
            return getNumJournalFiles() == 1;
         }
      }, TimeUnit.MINUTES.toMillis(2)));

      LOG.info("Number of journal log files: {}", getNumJournalFiles());
   }
}
