code: /*
   * 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.datasketches.memory.internal;
  
  import static org.testng.Assert.assertEquals;
  import static org.testng.Assert.assertFalse;
  import static org.testng.Assert.assertTrue;
  
  import org.apache.datasketches.memory.DefaultMemoryRequestServer;
  import org.apache.datasketches.memory.MemoryRequestServer;
  import org.apache.datasketches.memory.Resource;
  import org.apache.datasketches.memory.WritableMemory;
  import org.testng.annotations.Test;
  
  public class AllocateDirectMemoryTest {
  
    @Test(expectedExceptions = IllegalStateException.class)
    public void simpleAllocateDirect()  {
      int longs = 32;
      try (WritableMemory wMem = WritableMemory.allocateDirect(longs << 3)) {
        for (int i = 0; i < longs; i++) {
          wMem.putLong(i << 3, i);
          assertEquals(wMem.getLong(i << 3), i);
        }
        //inside the TWR block the memory should be valid
        ((ResourceImpl)wMem).checkValid();
        wMem.close(); //explicit close
      } //normal TWR close will not throw if already closed
    }
  
    @Test
    public void checkDefaultMemoryRequestServer()  {
      int longs1 = 32;
      int bytes1 = longs1 << 3;
      try (WritableMemory origWmem = WritableMemory.allocateDirect(bytes1)) {
        for (int i = 0; i < longs1; i++) { //puts data in wMem1
          origWmem.putLong(i << 3, i);
          assertEquals(origWmem.getLong(i << 3), i);
        }
        println(origWmem.toHexString("Test", 0, 32 * 8));
  
        int longs2 = 64;
        int bytes2 = longs2 << 3;
        MemoryRequestServer memReqSvr;
        if (Resource.defaultMemReqSvr == null) {
          memReqSvr = new DefaultMemoryRequestServer();
        } else {
          memReqSvr = origWmem.getMemoryRequestServer();
        }
        WritableMemory newWmem = memReqSvr.request(origWmem, bytes2);
        assertFalse(newWmem.isDirectResource()); //on heap by default
        for (int i = 0; i < longs2; i++) {
            newWmem.putLong(i << 3, i);
            assertEquals(newWmem.getLong(i << 3), i);
        }
        memReqSvr.requestClose(origWmem, newWmem);
        //The default MRS doesn't actually release because it could be easily misused.
        // So we let the TWR release it.
      }
    }
  
    @Test
    public void checkNonNativeDirect()  {
      try (WritableMemory wmem = WritableMemory.allocateDirect(128, Util.NON_NATIVE_BYTE_ORDER, null)) {
        wmem.putChar(0, (char) 1);
        assertEquals(wmem.getByte(1), (byte) 1);
      }
    }
  
    @Test
    public void checkExplicitClose() {
      final long cap = 128;
      WritableMemory wMem = WritableMemory.allocateDirect(cap);
      assertTrue(wMem.isValid());
      wMem.close();
      assertFalse(wMem.isValid());
    }
  
    @Test
    public void printlnTest() {
      println("PRINTING: " + this.getClass().getName());
    }
  
    /**
     * @param s value to print
     */
    static void println(String s) {
      //System.out.println(s); //disable here
    }
  }
  