1 /*
2 * Copyright (c) 2022-2023. Roland T. Lichti, Kaiserpfalz EDV-Service.
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <https://www.gnu.org/licenses/>.
16 */
17
18 package de.kaiserpfalzedv.commons.rest.workflow;
19
20 import java.util.Optional;
21
22 import de.kaiserpfalzedv.commons.core.workflow.WorkflowInfoImpl;
23 import jakarta.enterprise.inject.Produces;
24 import jakarta.inject.Singleton;
25 import jakarta.validation.constraints.NotNull;
26
27 /**
28 * WorkflowProvider -- Provides the workflow data of the current request.
29 *
30 * @author klenkes74 {@literal <rlichti@kaiserpfalz-edv.de>}
31 * @since 2.0.0 2022-01-04
32 */
33 @Singleton
34 public class WorkflowProvider {
35 private final ThreadLocal<WorkflowInfoImpl> infos = new WorkflowInfoThreadLocal();
36
37 @Produces
38 public Optional<WorkflowInfoImpl> getWorkflowInfo() {
39 return Optional.ofNullable(this.infos.get());
40 }
41
42 public void registerWorkflowInfo(@NotNull final WorkflowInfoImpl context) {
43 this.infos.set(context);
44 }
45
46 public void unregisterWorkflowInfo() {
47 this.infos.remove();
48 }
49
50 /**
51 * Subclass of {@link ThreadLocal} to generate an initial {@link WorkflowInfoImpl}.
52 */
53 private static class WorkflowInfoThreadLocal extends ThreadLocal<WorkflowInfoImpl> {
54 @Override
55 public WorkflowInfoImpl initialValue() {
56 return WorkflowInfoImpl.builder().build();
57 }
58 }
59 }