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8231921: (se) SelectorImpl.register does not need to set the attachment when it is null

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Reviewed-by: bpb
This commit is contained in:
Alan Bateman 2019-10-08 10:58:36 +01:00
parent f8f7cdcbe3
commit 51e94d8dac
2 changed files with 15 additions and 9 deletions
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21
src/java.base/share/classes/java/nio/channels/SelectionKey.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -25,7 +25,8 @@
package java.nio.channels;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
/**
* A token representing the registration of a {@link SelectableChannel} with a
@ -428,13 +429,17 @@ public abstract class SelectionKey {
// -- Attachments --
private static final VarHandle ATTACHMENT;
static {
try {
MethodHandles.Lookup l = MethodHandles.lookup();
ATTACHMENT = l.findVarHandle(SelectionKey.class, "attachment", Object.class);
} catch (Exception e) {
throw new InternalError(e);
}
}
private volatile Object attachment;
private static final AtomicReferenceFieldUpdater<SelectionKey,Object>
attachmentUpdater = AtomicReferenceFieldUpdater.newUpdater(
SelectionKey.class, Object.class, "attachment"
);
/**
* Attaches the given object to this key.
*
@ -450,7 +455,7 @@ public abstract class SelectionKey {
* otherwise {@code null}
*/
public final Object attach(Object ob) {
return attachmentUpdater.getAndSet(this, ob);
return ATTACHMENT.getAndSet(this, ob);
}
/**