How to use

positionAndSize

method

in

net.openhft.lang.io.DirectBytes

@Override
public T get(long index) {
  T t = acquire();
  Byteable byteable = (Byteable) t;
  DirectBytes bytes = (DirectBytes) byteable.bytes();
  bytes.positionAndSize(index * size, size);
  return t;
}

@Override
public T get(long index) {
  T t = acquire();
  Byteable byteable = (Byteable) t;
  DirectBytes bytes = (DirectBytes) byteable.bytes();
  bytes.positionAndSize(index * size, size);
  return t;
}

@Override
public void get(long index, T element) {
  if (tClass.isInstance(element)) {
    DirectBytes bytes = (DirectBytes) ((Byteable) element).bytes();
    bytes.positionAndSize(index * size, size);
    return;
  }
  T t = acquire();
  DirectBytes bytes = (DirectBytes) ((Byteable) t).bytes();
  bytes.positionAndSize(index * size, size);
  ((Copyable) element).copyFrom(t);
  recycle(t);
}

@Override
public void get(long index, T element) {
  if (tClass.isInstance(element)) {
    DirectBytes bytes = (DirectBytes) ((Byteable) element).bytes();
    bytes.positionAndSize(index * size, size);
    return;
  }
  T t = acquire();
  DirectBytes bytes = (DirectBytes) ((Byteable) t).bytes();
  bytes.positionAndSize(index * size, size);
  ((Copyable) element).copyFrom(t);
  recycle(t);
}

 final DirectStore store = DirectStore.allocate(128L << 32); // give me 128 GB
final DirectBytes slice = store.createSlice();

// every record has say 128 bytes and a lock at the start so they can be locked individually
for(long l = 0; l < store.size(); l += 128) {
  slice.positionAndSize(l, 128);
  slice.busyLock(0L);
  // change something
  slive.writeLong(4L, l);
  slice.unlock(0L);
}

// when finished with the store
store.free(); // still no GCs.