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
73
74
75
76
|
/*
* Copyright 2016 Google Inc.
*
* 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.
*/
package com.google.common.jimfs;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static java.util.concurrent.TimeUnit.SECONDS;
import java.nio.file.WatchService;
import java.util.concurrent.TimeUnit;
/**
* Configuration for the {@link WatchService} implementation used by a file system.
*
* @author Colin Decker
* @since 1.1
*/
public abstract class WatchServiceConfiguration {
/** The default configuration that's used if the user doesn't provide anything more specific. */
static final WatchServiceConfiguration DEFAULT = polling(5, SECONDS);
/**
* Returns a configuration for a {@link WatchService} that polls watched directories for changes
* every {@code interval} of the given {@code timeUnit} (e.g. every 5 {@link TimeUnit#SECONDS
* seconds}).
*/
@SuppressWarnings("GoodTime") // should accept a java.time.Duration
public static WatchServiceConfiguration polling(long interval, TimeUnit timeUnit) {
return new PollingConfig(interval, timeUnit);
}
WatchServiceConfiguration() {}
/** Creates a new {@link AbstractWatchService} implementation. */
// return type and parameters of this method subject to change if needed for any future
// implementations
abstract AbstractWatchService newWatchService(FileSystemView view, PathService pathService);
/** Implementation for {@link #polling}. */
private static final class PollingConfig extends WatchServiceConfiguration {
private final long interval;
private final TimeUnit timeUnit;
private PollingConfig(long interval, TimeUnit timeUnit) {
checkArgument(interval > 0, "interval (%s) must be positive", interval);
this.interval = interval;
this.timeUnit = checkNotNull(timeUnit);
}
@Override
AbstractWatchService newWatchService(FileSystemView view, PathService pathService) {
return new PollingWatchService(view, pathService, view.state(), interval, timeUnit);
}
@Override
public String toString() {
return "WatchServiceConfiguration.polling(" + interval + ", " + timeUnit + ")";
}
}
}
|
