code: /*
   * Copyright 2012-2018 Chronicle Map Contributors
   *
   * Licensed 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 net.openhft.chronicle.map;
  
  import net.openhft.chronicle.core.values.LongValue;
  import net.openhft.chronicle.values.Values;
  
  import java.io.File;
  import java.io.IOException;
  
  import static net.openhft.chronicle.algo.MemoryUnit.BYTES;
  import static net.openhft.chronicle.algo.MemoryUnit.MEGABYTES;
  
  public class VinceTest {
      public static void main(String[] args) throws IOException {
          long count = 100_000_000L;
          File f = File.createTempFile("vince", ".map");
          f.deleteOnExit();
          try (ChronicleMap<CharSequence, LongValue> catalog = ChronicleMap
                  .of(CharSequence.class, LongValue.class)
                  .entries(count)
                  .averageKey("100000000")
                  .putReturnsNull(true)
                  .createPersistedTo(f)) {
  
              long prev = System.currentTimeMillis();
  
              StringBuilder key = new StringBuilder();
              LongValue value = Values.newHeapInstance(LongValue.class);
  
              for (long i = 1; i <= count; i++) {
                  key.setLength(0);
                  key.append(i);
                  value.setValue(i);
                  catalog.put(key, value);
                  if ((i % 1_000_000) == 0) {
                      long now = System.currentTimeMillis();
                      System.out.printf("Average ns to insert per mi #%d: %d\n",
                              (i / 1_000_000), now - prev);
                      prev = now;
                  }
              }
              System.out.println("file size " + MEGABYTES.convert(f.length(), BYTES) + " MB");
          }
      }
  }
  