org.argeo.api.uuid/src/org/argeo/api/uuid/libuuid/DirectLibuuidFactory.java

   1 package org.argeo.api.uuid.libuuid;
   2
   3 import java.nio.ByteBuffer;
   4 import java.util.UUID;
   5
   6 import org.argeo.api.uuid.UuidBinaryUtils;
   7 import org.argeo.api.uuid.UuidFactory;
   8
   9 /**
  10  * @deprecated Rather use {@link LibuuidFactory}. This is just a proof of
  11  *             concept that using shared memory in order to limit the JNI
  12  *             overhead does not yield any significant performance gain. But it
  13  *             could be an approach for computing and transferring bulk UUIDs
  14  *             computations in one go, vi
  15  *             {@link ByteBuffer#allocateDirect(int)}.
  16  */
  17 public class DirectLibuuidFactory implements UuidFactory {
  18         static {
  19                 System.loadLibrary("Java_org_argeo_api_uuid_libuuid");
  20         }
  21
  22         @Override
  23         public UUID get() {
  24                 return timeUUID();
  25         }
  26
  27         @Override
  28         public UUID timeUUID() {
  29                 ByteBuffer buf = ByteBuffer.allocateDirect(16);
  30                 timeUUID(buf);
  31                 byte[] arr = new byte[16];
  32                 buf.get(arr);
  33                 return UuidBinaryUtils.fromBytes(arr);
  34         }
  35
  36         protected native void timeUUID(ByteBuffer uuidBuf);
  37
  38         @Override
  39         public UUID nameUUIDv5(UUID namespace, byte[] data) {
  40                 throw new UnsupportedOperationException();
  41         }
  42
  43         @Override
  44         public UUID nameUUIDv3(UUID namespace, byte[] data) {
  45                 throw new UnsupportedOperationException();
  46         }
  47
  48         @Override
  49         public UUID randomUUIDStrong() {
  50                 throw new UnsupportedOperationException();
  51         }
  52
  53         @Override
  54         public UUID randomUUIDWeak() {
  55                 throw new UnsupportedOperationException();
  56         }
  57
  58 }