1 /*
2  * Copyright (C) 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.tradefed.device.metric;
18 
19 import com.android.tradefed.config.OptionCopier;
20 import com.android.tradefed.testtype.IRemoteTest;
21 
22 import java.lang.reflect.InvocationTargetException;
23 import java.util.ArrayList;
24 import java.util.List;
25 
26 /** Helper to do some {@link IMetricCollector} operations needed in several places. */
27 public class CollectorHelper {
28 
29     /**
30      * Helper to clone {@link IMetricCollector}s in order for each {@link IRemoteTest} to get a
31      * different instance, and avoid internal state and multi-init issues.
32      *
33      * @param originalCollectors the list of original collectors to be cloned.
34      * @return The list of cloned {@link IMetricCollector}.
35      */
cloneCollectors( List<IMetricCollector> originalCollectors)36     public static List<IMetricCollector> cloneCollectors(
37             List<IMetricCollector> originalCollectors) {
38         List<IMetricCollector> cloneList = new ArrayList<>();
39         if (originalCollectors == null) {
40             return cloneList;
41         }
42         for (IMetricCollector collector : originalCollectors) {
43             try {
44                 // TF object should all have a constructore with no args, so this should be safe.
45                 IMetricCollector clone =
46                         collector.getClass().getDeclaredConstructor().newInstance();
47                 OptionCopier.copyOptionsNoThrow(collector, clone);
48                 cloneList.add(clone);
49             } catch (InstantiationException
50                     | IllegalAccessException
51                     | InvocationTargetException
52                     | NoSuchMethodException e) {
53                 throw new RuntimeException(e);
54             }
55         }
56         return cloneList;
57     }
58 }
59