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8325949: Create an internal utility method for creating VarHandle instances

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Reviewed-by: rriggs
This commit is contained in:
Per Minborg 2024-09-23 10:57:43 +00:00
parent 67448b0eb2
commit 384deda65f
31 changed files with 232 additions and 317 deletions
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24
src/java.base/share/classes/java/util/concurrent/StructuredTaskScope.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, 2023, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021, 2024, 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
@ -37,6 +37,7 @@ import java.util.function.Function;
import java.util.function.Supplier;
import jdk.internal.javac.PreviewFeature;
import jdk.internal.misc.ThreadFlock;
import jdk.internal.invoke.MhUtil;
/**
* A basic API for <em>structured concurrency</em>. {@code StructuredTaskScope} supports
@ -990,13 +991,9 @@ public class StructuredTaskScope<T> implements AutoCloseable {
private static final VarHandle FIRST_RESULT;
private static final VarHandle FIRST_EXCEPTION;
static {
try {
MethodHandles.Lookup l = MethodHandles.lookup();
FIRST_RESULT = l.findVarHandle(ShutdownOnSuccess.class, "firstResult", Object.class);
FIRST_EXCEPTION = l.findVarHandle(ShutdownOnSuccess.class, "firstException", Throwable.class);
} catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
MethodHandles.Lookup l = MethodHandles.lookup();
FIRST_RESULT = MhUtil.findVarHandle(l, "firstResult", Object.class);
FIRST_EXCEPTION = MhUtil.findVarHandle(l, "firstException", Throwable.class);
}
private volatile Object firstResult;
private volatile Throwable firstException;
@ -1177,15 +1174,8 @@ public class StructuredTaskScope<T> implements AutoCloseable {
*/
@PreviewFeature(feature = PreviewFeature.Feature.STRUCTURED_CONCURRENCY)
public static final class ShutdownOnFailure extends StructuredTaskScope<Object> {
private static final VarHandle FIRST_EXCEPTION;
static {
try {
MethodHandles.Lookup l = MethodHandles.lookup();
FIRST_EXCEPTION = l.findVarHandle(ShutdownOnFailure.class, "firstException", Throwable.class);
} catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
}
private static final VarHandle FIRST_EXCEPTION =
MhUtil.findVarHandle(MethodHandles.lookup(), "firstException", Throwable.class);
private volatile Throwable firstException;
/**