| // *************************************************************************************************************************** |
| // * 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.juneau.utils; |
| |
| import java.util.concurrent.atomic.*; |
| |
| /** |
| * Predefined ID generators. |
| */ |
| public class IdGenerators { |
| |
| /** |
| * Creates an ID generator using {@link AtomicInteger} initialized to value <c>1</c>. |
| * |
| * @param initValue The initial value. |
| * @return A new ID generator. |
| */ |
| public static IdGenerator<Integer> createIntGenerator(final int initValue) { |
| return new IdGenerator<Integer>() { |
| private final AtomicInteger i = new AtomicInteger(initValue); |
| |
| @Override /* IdGenerator */ |
| public synchronized Integer next() { |
| return i.getAndIncrement(); |
| } |
| |
| @Override |
| public synchronized void lb(Integer k) { |
| i.set(Math.max(k + 1, i.get())); |
| } |
| }; |
| } |
| |
| /** |
| * Creates an ID generator using {@link AtomicInteger} initialized to the specified value. |
| * |
| * @return A new ID generator. |
| */ |
| public static IdGenerator<Integer> createIntGenerator() { |
| return createIntGenerator(1); |
| } |
| |
| /** |
| * Creates an ID generator using {@link AtomicLong} initialized to value <c>1</c>. |
| * |
| * @param initValue The initial value. |
| * @return A new ID generator. |
| */ |
| public static IdGenerator<Long> createLongGenerator(final long initValue) { |
| return new IdGenerator<Long>() { |
| private final AtomicLong l = new AtomicLong(initValue); |
| |
| @Override /* IdGenerator */ |
| public synchronized Long next() { |
| return l.getAndIncrement(); |
| } |
| |
| @Override |
| public synchronized void lb(Long k) { |
| l.set(Math.max(k + 1, l.get())); |
| } |
| }; |
| } |
| |
| /** |
| * Creates an ID generator using {@link AtomicLong} initialized to the specified value. |
| * |
| * @return A new ID generator. |
| */ |
| public static IdGenerator<Long> createLongGenerator() { |
| return createLongGenerator(1); |
| } |
| } |