/*
 * 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.geode.internal.cache.diskPerf;

import static org.junit.Assert.assertEquals;

import java.util.Arrays;

import org.junit.Test;

import org.apache.geode.LogWriter;
import org.apache.geode.cache.Region;
import org.apache.geode.internal.cache.DiskRegionHelperFactory;
import org.apache.geode.internal.cache.DiskRegionProperties;
import org.apache.geode.internal.cache.DiskRegionTestingBase;
import org.apache.geode.internal.cache.LocalRegion;
import org.apache.geode.internal.cache.eviction.EvictionCounters;

/**
 * Disk region Perf test for Overflow only with ASync writes. 1) Performance of Put operation
 * causing an eviction. 2) Performance of Get operation for entry which will fault in.
 */
public class DiskRegOverflowAsyncJUnitPerformanceTest extends DiskRegionTestingBase {

  private static final int ENTRY_SIZE = 1024 * 5;

  /**
   * Do not change the value OP_COUNT = 400 The test case is dependent on this value.
   */
  private static final int OP_COUNT = 400;

  private static final int HALF_OP_COUNT = OP_COUNT / 2;

  private LogWriter log = null;

  private final DiskRegionProperties diskProps = new DiskRegionProperties();

  @Override
  protected final void postSetUp() throws Exception {
    diskProps.setDiskDirs(dirs);
    diskProps.setTimeInterval(1000l);
    diskProps.setBytesThreshold(10000l);
    diskProps.setOverFlowCapacity(1000);
    region = DiskRegionHelperFactory.getAsyncOverFlowOnlyRegion(cache, diskProps);
    log = ds.getLogWriter();
  }

  @Override
  protected final void postTearDown() throws Exception {
    if (cache != null) {
      cache.close();
    }
    if (ds != null) {
      ds.disconnect();
    }
  }

  @Test
  public void testPopulatefor5Kbwrites() {
    // RegionAttributes ra = region.getAttributes();
    EvictionCounters lruStats = getLRUStats(region);
    // Put in larger stuff until we start evicting
    int total;
    for (total = 0; lruStats.getEvictions() <= 0; total++) {
      log.info("DEBUG: total " + total + ", evictions " + lruStats.getEvictions());
      int[] array = new int[250];
      array[0] = total;
      region.put(total, array);
    }

    assertEquals(1, lruStats.getEvictions());

    // put another 1mb data which will evicted to disk.
    // final String key = "K";
    final byte[] value = new byte[ENTRY_SIZE];
    Arrays.fill(value, (byte) 77);
    for (int i = 0; i < HALF_OP_COUNT; i++) {
      log.info("DEBUG: total " + total + ", evictions " + lruStats.getEvictions());
      region.put("" + i, value);
    }

    assertEquals(201, lruStats.getEvictions());

    // the next puts will be written to disk
    long startTime = System.currentTimeMillis();
    for (int i = 201; i < OP_COUNT; i++) {
      region.put("" + i, value);
    }
    long endTime = System.currentTimeMillis();
    System.out.println(" done with putting");
    // Now get all the entries which are on disk.
    long startTimeGet = System.currentTimeMillis();
    for (int i = 0; i < HALF_OP_COUNT; i++) {
      region.get("" + i);
    }
    long endTimeGet = System.currentTimeMillis();
    System.out.println(" done with getting");

    region.close(); // closes disk file which will flush all
    // buffers
    float et = endTime - startTime;
    float etSecs = et / 1000f;
    float opPerSec = etSecs == 0 ? 0 : (OP_COUNT / (et / 1000f));
    float bytesPerSec = etSecs == 0 ? 0 : ((OP_COUNT * ENTRY_SIZE) / (et / 1000f));

    String stats = "et=" + et + "ms writes/sec=" + opPerSec + " bytes/sec=" + bytesPerSec;
    log.info(stats);
    System.out.println("Stats for 5kb writes: Perf of Put which is cauing eviction :" + stats);
    // Perf stats for get op
    float etGet = endTimeGet - startTimeGet;
    float etSecsGet = etGet / 1000f;
    float opPerSecGet = etSecsGet == 0 ? 0 : (OP_COUNT / (etGet / 1000f));
    float bytesPerSecGet = etSecsGet == 0 ? 0 : ((OP_COUNT * ENTRY_SIZE) / (etGet / 1000f));

    String statsGet =
        "etGet=" + etGet + "ms gets/sec=" + opPerSecGet + " bytes/sec=" + bytesPerSecGet;
    log.info(statsGet);
    System.out.println("Perf Stats of get which is fauting in :" + statsGet);
  }

  private EvictionCounters getLRUStats(Region region) {
    return ((LocalRegion) region).getEvictionController().getCounters();
  }
}
