/**
    * 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.hadoop.hbase.procedure2.store.wal;
  
  import java.io.IOException;
  import java.util.Random;
  import java.util.concurrent.atomic.AtomicLong;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.FileStatus;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hbase.HBaseCommonTestingUtility;
  import org.apache.hadoop.hbase.procedure2.Procedure;
  import org.apache.hadoop.hbase.procedure2.ProcedureTestingUtility;
  import org.apache.hadoop.hbase.procedure2.ProcedureTestingUtility.LoadCounter;
  import org.apache.hadoop.hbase.procedure2.ProcedureTestingUtility.TestProcedure;
  import org.apache.hadoop.hbase.testclassification.LargeTests;
  import org.apache.hadoop.hbase.testclassification.MasterTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.hadoop.io.IOUtils;
  
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  @Category({MasterTests.class, LargeTests.class})
  public class TestStressWALProcedureStore {
    private static final Log LOG = LogFactory.getLog(TestWALProcedureStore.class);
  
    private static final int PROCEDURE_STORE_SLOTS = 8;
  
    private WALProcedureStore procStore;
  
    private HBaseCommonTestingUtility htu;
    private FileSystem fs;
    private Path testDir;
    private Path logDir;
  
    private void setupConfiguration(Configuration conf) {
      conf.setBoolean(WALProcedureStore.USE_HSYNC_CONF_KEY, false);
      conf.setInt(WALProcedureStore.PERIODIC_ROLL_CONF_KEY, 5000);
      conf.setInt(WALProcedureStore.ROLL_THRESHOLD_CONF_KEY, 128 * 1024);
    }
  
    @Before
    public void setUp() throws IOException {
      htu = new HBaseCommonTestingUtility();
      setupConfiguration(htu.getConfiguration());
  
      testDir = htu.getDataTestDir();
      fs = testDir.getFileSystem(htu.getConfiguration());
      assertTrue(testDir.depth() > 1);
  
      logDir = new Path(testDir, "proc-logs");
      procStore = ProcedureTestingUtility.createWalStore(htu.getConfiguration(), fs, logDir);
      procStore.start(PROCEDURE_STORE_SLOTS);
      procStore.recoverLease();
  
      LoadCounter loader = new LoadCounter();
      procStore.load(loader);
      assertEquals(0, loader.getMaxProcId());
      assertEquals(0, loader.getLoadedCount());
      assertEquals(0, loader.getCorruptedCount());
    }
  
    @After
    public void tearDown() throws IOException {
      procStore.stop(false);
      fs.delete(logDir, true);
    }
  
    @Test
    public void testInsertUpdateDelete() throws Exception {
      final long LAST_PROC_ID = 19999;
     final Thread[] thread = new Thread[PROCEDURE_STORE_SLOTS];
     final AtomicLong procCounter = new AtomicLong((long)Math.round(Math.random() * 100));
     for (int i = 0; i < thread.length; ++i) {
       thread[i] = new Thread() {
         @Override
         public void run() {
           Random rand = new Random();
           TestProcedure proc;
           do {
             proc = new TestProcedure(procCounter.addAndGet(1));
             // Insert
             procStore.insert(proc, null);
             // Update
             for (int i = 0, nupdates = rand.nextInt(10); i <= nupdates; ++i) {
               try { Thread.sleep(0, rand.nextInt(15)); } catch (InterruptedException e) {}
               procStore.update(proc);
             }
             // Delete
             procStore.delete(proc.getProcId());
           } while (proc.getProcId() < LAST_PROC_ID);
         }
       };
       thread[i].start();
     }
 
     for (int i = 0; i < thread.length; ++i) {
       thread[i].join();
     }
 
     procStore.getStoreTracker().dump();
     assertTrue(procCounter.get() >= LAST_PROC_ID);
     assertTrue(procStore.getStoreTracker().isEmpty());
     assertEquals(1, procStore.getActiveLogs().size());
   }
 }