blob: bb718218aeb116170dddcc28e384901f3a41c1f8 (
plain) (
blame)
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
|
// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.io;
import java.nio.channels.SelectionKey;
/**
* Command object to perform interest set updates. Workaround for NIO
* design flaw which makes it impossible to update the interest set of
* a SelectionKey while select() is in progress. There should be a
* more elegant way around this, but if it turns out to be performant
* enough we leave it like this.
*
* <P>
* Of course, the ideal would be to have NIO fixed.
*
* @author <a href="mailto:travisb@yahoo-inc.com">Bob Travis</a>
* @author <a href="mailto:borud@yahoo-inc.com">Bjorn Borud</a>
*/
public class UpdateInterest {
private SelectionKey key;
private int operation;
private boolean set;
/**
* Make sure this can't be run
*/
@SuppressWarnings("unused")
private UpdateInterest() {}
/**
* Create an object for encapsulating a interest set change
* request.
*
* @param key The key we wish to update
* @param operation The operation we wish to set or remove
* @param set Whether we want to set (true) or clear (false) the
* operation in the interest set
*/
public UpdateInterest(SelectionKey key, int operation, boolean set) {
this.key = key;
this.operation = operation;
this.set = set;
}
/**
* This method is used for actually applying the updates to the
* SelectionKey in question at a time when it is safe to do so.
* If the SelectionKey has been invalidated in the meanwhile we
* do nothing.
*/
public void doUpdate() {
// bail if this key isn't valid anymore
if ((key == null) || (!key.isValid())) {
return;
}
if (set) {
key.interestOps(key.interestOps() | operation);
} else {
key.interestOps(key.interestOps() & (~operation));
}
}
}
|
