01 /*
02 * SPDX-License-Identifier: Apache-2.0
03 *
04 * Copyright 2008-2017 the original author or authors.
05 *
06 * Licensed under the Apache License, Version 2.0 (the "License");
07 * you may not use this file except in compliance with the License.
08 * You may obtain a copy of the License at
09 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.codehaus.griffon.runtime.core.injection;
19
20 import javax.annotation.Nonnull;
21 import java.util.ArrayList;
22 import java.util.List;
23
24 import static griffon.util.GriffonClassUtils.requireState;
25 import static java.util.Objects.requireNonNull;
26
27 /**
28 * @author Andres Almiray
29 * @since 2.6.0
30 */
31 public class InjectionUnitOfWork {
32 private static final ThreadLocal<List<Object>> CONTEXT = new ThreadLocal<>();
33 private static final String ERROR_NO_UNITOFWORK_IN_PROCESS = "There is no InjectionUnitOfWork in process!";
34
35 private InjectionUnitOfWork() {
36 // prevent instantiation
37 }
38
39 public static void start() {
40 requireState(CONTEXT.get() == null, "There is already an existing InjectionUnitOfWork in process!");
41 CONTEXT.set(new ArrayList<>());
42 }
43
44 @Nonnull
45 public static List<Object> finish() {
46 List<Object> instances = CONTEXT.get();
47 requireState(instances != null, ERROR_NO_UNITOFWORK_IN_PROCESS);
48 CONTEXT.set(null);
49 return instances;
50 }
51
52 public static void track(@Nonnull Object instance) {
53 requireNonNull(instance, "Argument 'instance' must not be null");
54 List<Object> instances = CONTEXT.get();
55 requireState(instances != null, ERROR_NO_UNITOFWORK_IN_PROCESS);
56 instances.add(instance);
57 }
58 }
|