blob: f2b3d5d643a3a989197c8451b1ab5b61b1d15b64 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/*-
* ============LICENSE_START=======================================================
* ONAP - SO
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.so.client.dmaap;
import java.util.ServiceLoader;
public class DmaapPropertiesLoader {
/* required to make ServiceLoader thread safe */
private static final ThreadLocal<ServiceLoader<DmaapProperties>> services =
new ThreadLocal<ServiceLoader<DmaapProperties>>() {
@Override
protected ServiceLoader<DmaapProperties> initialValue() {
return ServiceLoader.load(DmaapProperties.class);
}
};
private DmaapPropertiesLoader() {}
private static class Helper {
private static final DmaapPropertiesLoader INSTANCE = new DmaapPropertiesLoader();
}
public static DmaapPropertiesLoader getInstance() {
return Helper.INSTANCE;
}
public DmaapProperties getImpl() {
return this.getImpl(false);
}
public DmaapProperties getNewImpl() {
return this.getImpl(true);
}
private DmaapProperties getImpl(boolean forceNewInstance) {
ServiceLoader<DmaapProperties> loader = this.services.get();
for (DmaapProperties service : loader) {
if (forceNewInstance) {
try {
return service.getClass().newInstance();
} catch (InstantiationException | IllegalAccessException e) {
/*
* all spi implementations must provide a public no argument constructor
*/
}
} else {
return service;
}
}
return null;
}
}
|
