| package org.onlab.onos.net.intent.impl; |
| |
| import org.onlab.onos.net.intent.IdGenerator; |
| |
| /** |
| * Base class of {@link IdGenerator} implementations which use {@link IdBlockAllocator} as |
| * backend. |
| * |
| * @param <T> the type of ID |
| */ |
| public abstract class AbstractBlockAllocatorBasedIdGenerator<T> implements IdGenerator<T> { |
| protected final IdBlockAllocator allocator; |
| protected IdBlock idBlock; |
| |
| /** |
| * Constructs an ID generator which use {@link IdBlockAllocator} as backend. |
| * |
| * @param allocator |
| */ |
| protected AbstractBlockAllocatorBasedIdGenerator(IdBlockAllocator allocator) { |
| this.allocator = allocator; |
| this.idBlock = allocator.allocateUniqueIdBlock(); |
| } |
| |
| @Override |
| public synchronized T getNewId() { |
| try { |
| return convertFrom(idBlock.getNextId()); |
| } catch (UnavailableIdException e) { |
| idBlock = allocator.allocateUniqueIdBlock(); |
| return convertFrom(idBlock.getNextId()); |
| } |
| } |
| |
| /** |
| * Returns an ID instance of {@code T} type from the long value. |
| * |
| * @param value original long value |
| * @return ID instance |
| */ |
| protected abstract T convertFrom(long value); |
| } |