feat(jdk8): move files to new folder to avoid resources compiled.
This commit is contained in:
@@ -0,0 +1,543 @@
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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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||||
*
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||||
* This code is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License version 2 only, as
|
||||
* published by the Free Software Foundation. Oracle designates this
|
||||
* particular file as subject to the "Classpath" exception as provided
|
||||
* by Oracle in the LICENSE file that accompanied this code.
|
||||
*
|
||||
* This code is distributed in the hope that it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
* version 2 for more details (a copy is included in the LICENSE file that
|
||||
* accompanied this code).
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License version
|
||||
* 2 along with this work; if not, write to the Free Software Foundation,
|
||||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
*
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||||
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
||||
* or visit www.oracle.com if you need additional information or have any
|
||||
* questions.
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||||
*/
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||||
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||||
/*
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||||
* This file is available under and governed by the GNU General Public
|
||||
* License version 2 only, as published by the Free Software Foundation.
|
||||
* However, the following notice accompanied the original version of this
|
||||
* file:
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*
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||||
* Written by Doug Lea with assistance from members of JCP JSR-166
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||||
* Expert Group and released to the public domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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*/
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package java.util.concurrent.atomic;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.security.AccessController;
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import java.security.PrivilegedActionException;
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import java.security.PrivilegedExceptionAction;
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import java.util.Objects;
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import java.util.function.IntBinaryOperator;
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import java.util.function.IntUnaryOperator;
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import sun.reflect.CallerSensitive;
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import sun.reflect.Reflection;
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/**
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* A reflection-based utility that enables atomic updates to
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* designated {@code volatile int} fields of designated classes.
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* This class is designed for use in atomic data structures in which
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* several fields of the same node are independently subject to atomic
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* updates.
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*
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* <p>Note that the guarantees of the {@code compareAndSet}
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* method in this class are weaker than in other atomic classes.
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* Because this class cannot ensure that all uses of the field
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* are appropriate for purposes of atomic access, it can
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* guarantee atomicity only with respect to other invocations of
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* {@code compareAndSet} and {@code set} on the same updater.
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*
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* @since 1.5
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* @author Doug Lea
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* @param <T> The type of the object holding the updatable field
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*/
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public abstract class AtomicIntegerFieldUpdater<T> {
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/**
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* Creates and returns an updater for objects with the given field.
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* The Class argument is needed to check that reflective types and
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* generic types match.
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*
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* @param tclass the class of the objects holding the field
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* @param fieldName the name of the field to be updated
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* @param <U> the type of instances of tclass
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* @return the updater
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* @throws IllegalArgumentException if the field is not a
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* volatile integer type
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* @throws RuntimeException with a nested reflection-based
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* exception if the class does not hold field or is the wrong type,
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* or the field is inaccessible to the caller according to Java language
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* access control
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*/
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@CallerSensitive
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public static <U> AtomicIntegerFieldUpdater<U> newUpdater(Class<U> tclass,
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String fieldName) {
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return new AtomicIntegerFieldUpdaterImpl<U>
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(tclass, fieldName, Reflection.getCallerClass());
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}
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/**
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* Protected do-nothing constructor for use by subclasses.
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*/
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protected AtomicIntegerFieldUpdater() {
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}
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/**
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* Atomically sets the field of the given object managed by this updater
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* to the given updated value if the current value {@code ==} the
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* expected value. This method is guaranteed to be atomic with respect to
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* other calls to {@code compareAndSet} and {@code set}, but not
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* necessarily with respect to other changes in the field.
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*
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* @param obj An object whose field to conditionally set
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* @param expect the expected value
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* @param update the new value
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* @return {@code true} if successful
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* @throws ClassCastException if {@code obj} is not an instance
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* of the class possessing the field established in the constructor
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*/
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public abstract boolean compareAndSet(T obj, int expect, int update);
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/**
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* Atomically sets the field of the given object managed by this updater
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* to the given updated value if the current value {@code ==} the
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* expected value. This method is guaranteed to be atomic with respect to
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* other calls to {@code compareAndSet} and {@code set}, but not
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* necessarily with respect to other changes in the field.
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*
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* <p><a href="package-summary.html#weakCompareAndSet">May fail
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* spuriously and does not provide ordering guarantees</a>, so is
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* only rarely an appropriate alternative to {@code compareAndSet}.
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*
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* @param obj An object whose field to conditionally set
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* @param expect the expected value
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* @param update the new value
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* @return {@code true} if successful
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* @throws ClassCastException if {@code obj} is not an instance
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* of the class possessing the field established in the constructor
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*/
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public abstract boolean weakCompareAndSet(T obj, int expect, int update);
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/**
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* Sets the field of the given object managed by this updater to the
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* given updated value. This operation is guaranteed to act as a volatile
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* store with respect to subsequent invocations of {@code compareAndSet}.
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*
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* @param obj An object whose field to set
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* @param newValue the new value
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*/
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public abstract void set(T obj, int newValue);
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/**
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* Eventually sets the field of the given object managed by this
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* updater to the given updated value.
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*
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* @param obj An object whose field to set
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* @param newValue the new value
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* @since 1.6
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*/
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public abstract void lazySet(T obj, int newValue);
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/**
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* Gets the current value held in the field of the given object managed
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* by this updater.
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*
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* @param obj An object whose field to get
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* @return the current value
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*/
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public abstract int get(T obj);
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/**
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* Atomically sets the field of the given object managed by this updater
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* to the given value and returns the old value.
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*
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* @param obj An object whose field to get and set
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* @param newValue the new value
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* @return the previous value
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*/
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public int getAndSet(T obj, int newValue) {
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int prev;
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do {
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prev = get(obj);
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} while (!compareAndSet(obj, prev, newValue));
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return prev;
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}
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/**
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* Atomically increments by one the current value of the field of the
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* given object managed by this updater.
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*
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* @param obj An object whose field to get and set
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* @return the previous value
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*/
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public int getAndIncrement(T obj) {
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int prev, next;
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do {
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prev = get(obj);
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next = prev + 1;
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} while (!compareAndSet(obj, prev, next));
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return prev;
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}
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/**
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* Atomically decrements by one the current value of the field of the
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* given object managed by this updater.
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*
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* @param obj An object whose field to get and set
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* @return the previous value
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*/
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public int getAndDecrement(T obj) {
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int prev, next;
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do {
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prev = get(obj);
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next = prev - 1;
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} while (!compareAndSet(obj, prev, next));
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return prev;
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}
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/**
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* Atomically adds the given value to the current value of the field of
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* the given object managed by this updater.
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*
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* @param obj An object whose field to get and set
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* @param delta the value to add
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* @return the previous value
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*/
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public int getAndAdd(T obj, int delta) {
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int prev, next;
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do {
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prev = get(obj);
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next = prev + delta;
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} while (!compareAndSet(obj, prev, next));
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||||
return prev;
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}
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/**
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* Atomically increments by one the current value of the field of the
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* given object managed by this updater.
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*
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* @param obj An object whose field to get and set
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* @return the updated value
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*/
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public int incrementAndGet(T obj) {
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int prev, next;
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do {
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prev = get(obj);
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next = prev + 1;
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} while (!compareAndSet(obj, prev, next));
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return next;
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}
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/**
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* Atomically decrements by one the current value of the field of the
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* given object managed by this updater.
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*
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* @param obj An object whose field to get and set
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* @return the updated value
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*/
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public int decrementAndGet(T obj) {
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int prev, next;
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do {
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prev = get(obj);
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next = prev - 1;
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} while (!compareAndSet(obj, prev, next));
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return next;
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}
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/**
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* Atomically adds the given value to the current value of the field of
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* the given object managed by this updater.
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*
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* @param obj An object whose field to get and set
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* @param delta the value to add
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* @return the updated value
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*/
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public int addAndGet(T obj, int delta) {
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int prev, next;
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do {
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prev = get(obj);
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next = prev + delta;
|
||||
} while (!compareAndSet(obj, prev, next));
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return next;
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}
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/**
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* Atomically updates the field of the given object managed by this updater
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* with the results of applying the given function, returning the previous
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* value. The function should be side-effect-free, since it may be
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* re-applied when attempted updates fail due to contention among threads.
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*
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* @param obj An object whose field to get and set
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* @param updateFunction a side-effect-free function
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* @return the previous value
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* @since 1.8
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*/
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public final int getAndUpdate(T obj, IntUnaryOperator updateFunction) {
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int prev, next;
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||||
do {
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prev = get(obj);
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next = updateFunction.applyAsInt(prev);
|
||||
} while (!compareAndSet(obj, prev, next));
|
||||
return prev;
|
||||
}
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||||
|
||||
/**
|
||||
* Atomically updates the field of the given object managed by this updater
|
||||
* with the results of applying the given function, returning the updated
|
||||
* value. The function should be side-effect-free, since it may be
|
||||
* re-applied when attempted updates fail due to contention among threads.
|
||||
*
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||||
* @param obj An object whose field to get and set
|
||||
* @param updateFunction a side-effect-free function
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||||
* @return the updated value
|
||||
* @since 1.8
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*/
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public final int updateAndGet(T obj, IntUnaryOperator updateFunction) {
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||||
int prev, next;
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||||
do {
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||||
prev = get(obj);
|
||||
next = updateFunction.applyAsInt(prev);
|
||||
} while (!compareAndSet(obj, prev, next));
|
||||
return next;
|
||||
}
|
||||
|
||||
/**
|
||||
* Atomically updates the field of the given object managed by this
|
||||
* updater with the results of applying the given function to the
|
||||
* current and given values, returning the previous value. The
|
||||
* function should be side-effect-free, since it may be re-applied
|
||||
* when attempted updates fail due to contention among threads. The
|
||||
* function is applied with the current value as its first argument,
|
||||
* and the given update as the second argument.
|
||||
*
|
||||
* @param obj An object whose field to get and set
|
||||
* @param x the update value
|
||||
* @param accumulatorFunction a side-effect-free function of two arguments
|
||||
* @return the previous value
|
||||
* @since 1.8
|
||||
*/
|
||||
public final int getAndAccumulate(T obj, int x,
|
||||
IntBinaryOperator accumulatorFunction) {
|
||||
int prev, next;
|
||||
do {
|
||||
prev = get(obj);
|
||||
next = accumulatorFunction.applyAsInt(prev, x);
|
||||
} while (!compareAndSet(obj, prev, next));
|
||||
return prev;
|
||||
}
|
||||
|
||||
/**
|
||||
* Atomically updates the field of the given object managed by this
|
||||
* updater with the results of applying the given function to the
|
||||
* current and given values, returning the updated value. The
|
||||
* function should be side-effect-free, since it may be re-applied
|
||||
* when attempted updates fail due to contention among threads. The
|
||||
* function is applied with the current value as its first argument,
|
||||
* and the given update as the second argument.
|
||||
*
|
||||
* @param obj An object whose field to get and set
|
||||
* @param x the update value
|
||||
* @param accumulatorFunction a side-effect-free function of two arguments
|
||||
* @return the updated value
|
||||
* @since 1.8
|
||||
*/
|
||||
public final int accumulateAndGet(T obj, int x,
|
||||
IntBinaryOperator accumulatorFunction) {
|
||||
int prev, next;
|
||||
do {
|
||||
prev = get(obj);
|
||||
next = accumulatorFunction.applyAsInt(prev, x);
|
||||
} while (!compareAndSet(obj, prev, next));
|
||||
return next;
|
||||
}
|
||||
|
||||
/**
|
||||
* Standard hotspot implementation using intrinsics.
|
||||
*/
|
||||
private static final class AtomicIntegerFieldUpdaterImpl<T>
|
||||
extends AtomicIntegerFieldUpdater<T> {
|
||||
private static final sun.misc.Unsafe U = sun.misc.Unsafe.getUnsafe();
|
||||
private final long offset;
|
||||
/**
|
||||
* if field is protected, the subclass constructing updater, else
|
||||
* the same as tclass
|
||||
*/
|
||||
private final Class<?> cclass;
|
||||
/** class holding the field */
|
||||
private final Class<T> tclass;
|
||||
|
||||
AtomicIntegerFieldUpdaterImpl(final Class<T> tclass,
|
||||
final String fieldName,
|
||||
final Class<?> caller) {
|
||||
final Field field;
|
||||
final int modifiers;
|
||||
try {
|
||||
field = AccessController.doPrivileged(
|
||||
new PrivilegedExceptionAction<Field>() {
|
||||
public Field run() throws NoSuchFieldException {
|
||||
return tclass.getDeclaredField(fieldName);
|
||||
}
|
||||
});
|
||||
modifiers = field.getModifiers();
|
||||
sun.reflect.misc.ReflectUtil.ensureMemberAccess(
|
||||
caller, tclass, null, modifiers);
|
||||
ClassLoader cl = tclass.getClassLoader();
|
||||
ClassLoader ccl = caller.getClassLoader();
|
||||
if ((ccl != null) && (ccl != cl) &&
|
||||
((cl == null) || !isAncestor(cl, ccl))) {
|
||||
sun.reflect.misc.ReflectUtil.checkPackageAccess(tclass);
|
||||
}
|
||||
} catch (PrivilegedActionException pae) {
|
||||
throw new RuntimeException(pae.getException());
|
||||
} catch (Exception ex) {
|
||||
throw new RuntimeException(ex);
|
||||
}
|
||||
|
||||
if (field.getType() != int.class)
|
||||
throw new IllegalArgumentException("Must be integer type");
|
||||
|
||||
if (!Modifier.isVolatile(modifiers))
|
||||
throw new IllegalArgumentException("Must be volatile type");
|
||||
|
||||
// Access to protected field members is restricted to receivers only
|
||||
// of the accessing class, or one of its subclasses, and the
|
||||
// accessing class must in turn be a subclass (or package sibling)
|
||||
// of the protected member's defining class.
|
||||
// If the updater refers to a protected field of a declaring class
|
||||
// outside the current package, the receiver argument will be
|
||||
// narrowed to the type of the accessing class.
|
||||
this.cclass = (Modifier.isProtected(modifiers) &&
|
||||
tclass.isAssignableFrom(caller) &&
|
||||
!isSamePackage(tclass, caller))
|
||||
? caller : tclass;
|
||||
this.tclass = tclass;
|
||||
this.offset = U.objectFieldOffset(field);
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns true if the second classloader can be found in the first
|
||||
* classloader's delegation chain.
|
||||
* Equivalent to the inaccessible: first.isAncestor(second).
|
||||
*/
|
||||
private static boolean isAncestor(ClassLoader first, ClassLoader second) {
|
||||
ClassLoader acl = first;
|
||||
do {
|
||||
acl = acl.getParent();
|
||||
if (second == acl) {
|
||||
return true;
|
||||
}
|
||||
} while (acl != null);
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns true if the two classes have the same class loader and
|
||||
* package qualifier
|
||||
*/
|
||||
private static boolean isSamePackage(Class<?> class1, Class<?> class2) {
|
||||
return class1.getClassLoader() == class2.getClassLoader()
|
||||
&& Objects.equals(getPackageName(class1), getPackageName(class2));
|
||||
}
|
||||
|
||||
private static String getPackageName(Class<?> cls) {
|
||||
String cn = cls.getName();
|
||||
int dot = cn.lastIndexOf('.');
|
||||
return (dot != -1) ? cn.substring(0, dot) : "";
|
||||
}
|
||||
|
||||
/**
|
||||
* Checks that target argument is instance of cclass. On
|
||||
* failure, throws cause.
|
||||
*/
|
||||
private final void accessCheck(T obj) {
|
||||
if (!cclass.isInstance(obj))
|
||||
throwAccessCheckException(obj);
|
||||
}
|
||||
|
||||
/**
|
||||
* Throws access exception if accessCheck failed due to
|
||||
* protected access, else ClassCastException.
|
||||
*/
|
||||
private final void throwAccessCheckException(T obj) {
|
||||
if (cclass == tclass)
|
||||
throw new ClassCastException();
|
||||
else
|
||||
throw new RuntimeException(
|
||||
new IllegalAccessException(
|
||||
"Class " +
|
||||
cclass.getName() +
|
||||
" can not access a protected member of class " +
|
||||
tclass.getName() +
|
||||
" using an instance of " +
|
||||
obj.getClass().getName()));
|
||||
}
|
||||
|
||||
public final boolean compareAndSet(T obj, int expect, int update) {
|
||||
accessCheck(obj);
|
||||
return U.compareAndSwapInt(obj, offset, expect, update);
|
||||
}
|
||||
|
||||
public final boolean weakCompareAndSet(T obj, int expect, int update) {
|
||||
accessCheck(obj);
|
||||
return U.compareAndSwapInt(obj, offset, expect, update);
|
||||
}
|
||||
|
||||
public final void set(T obj, int newValue) {
|
||||
accessCheck(obj);
|
||||
U.putIntVolatile(obj, offset, newValue);
|
||||
}
|
||||
|
||||
public final void lazySet(T obj, int newValue) {
|
||||
accessCheck(obj);
|
||||
U.putOrderedInt(obj, offset, newValue);
|
||||
}
|
||||
|
||||
public final int get(T obj) {
|
||||
accessCheck(obj);
|
||||
return U.getIntVolatile(obj, offset);
|
||||
}
|
||||
|
||||
public final int getAndSet(T obj, int newValue) {
|
||||
accessCheck(obj);
|
||||
return U.getAndSetInt(obj, offset, newValue);
|
||||
}
|
||||
|
||||
public final int getAndAdd(T obj, int delta) {
|
||||
accessCheck(obj);
|
||||
return U.getAndAddInt(obj, offset, delta);
|
||||
}
|
||||
|
||||
public final int getAndIncrement(T obj) {
|
||||
return getAndAdd(obj, 1);
|
||||
}
|
||||
|
||||
public final int getAndDecrement(T obj) {
|
||||
return getAndAdd(obj, -1);
|
||||
}
|
||||
|
||||
public final int incrementAndGet(T obj) {
|
||||
return getAndAdd(obj, 1) + 1;
|
||||
}
|
||||
|
||||
public final int decrementAndGet(T obj) {
|
||||
return getAndAdd(obj, -1) - 1;
|
||||
}
|
||||
|
||||
public final int addAndGet(T obj, int delta) {
|
||||
return getAndAdd(obj, delta) + delta;
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user