| /* |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * 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. |
| * |
| * 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. |
| */ |
| |
| /* |
| * 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: |
| * |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| */ |
| |
| |
| package java.util.concurrent.atomic; |
| |
| |
| /** |
| * A reflection-based utility that enables atomic updates to |
| * designated {@code volatile long} fields of designated classes. |
| * This class is designed for use in atomic data structures in which |
| * several fields of the same node are independently subject to atomic |
| * updates. |
| * |
| * <p>Note that the guarantees of the {@code compareAndSet} |
| * method in this class are weaker than in other atomic classes. |
| * Because this class cannot ensure that all uses of the field |
| * are appropriate for purposes of atomic access, it can |
| * guarantee atomicity only with respect to other invocations of |
| * {@code compareAndSet} and {@code set} on the same updater. |
| * |
| * @since 1.5 |
| * @author Doug Lea |
| * @param <T> The type of the object holding the updatable field |
| */ |
| |
| @SuppressWarnings({"unchecked", "deprecation", "all"}) |
| public abstract class AtomicLongFieldUpdater<T> { |
| |
| /** |
| * Protected do-nothing constructor for use by subclasses. |
| */ |
| |
| protected AtomicLongFieldUpdater() { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Creates and returns an updater for objects with the given field. |
| * The Class argument is needed to check that reflective types and |
| * generic types match. |
| * |
| * @param tclass the class of the objects holding the field |
| * @param fieldName the name of the field to be updated |
| * @param <U> the type of instances of tclass |
| * @return the updater |
| * @throws java.lang.IllegalArgumentException if the field is not a |
| * volatile long type |
| * @throws java.lang.RuntimeException with a nested reflection-based |
| * exception if the class does not hold field or is the wrong type, |
| * or the field is inaccessible to the caller according to Java language |
| * access control |
| */ |
| |
| public static <U> java.util.concurrent.atomic.AtomicLongFieldUpdater<U> newUpdater(java.lang.Class<U> tclass, java.lang.String fieldName) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Atomically sets the field of the given object managed by this updater |
| * to the given updated value if the current value {@code ==} the |
| * expected value. This method is guaranteed to be atomic with respect to |
| * other calls to {@code compareAndSet} and {@code set}, but not |
| * necessarily with respect to other changes in the field. |
| * |
| * @param obj An object whose field to conditionally set |
| * @param expect the expected value |
| * @param update the new value |
| * @return {@code true} if successful |
| * @throws java.lang.ClassCastException if {@code obj} is not an instance |
| * of the class possessing the field established in the constructor |
| */ |
| |
| public abstract boolean compareAndSet(T obj, long expect, long update); |
| |
| /** |
| * Atomically sets the field of the given object managed by this updater |
| * to the given updated value if the current value {@code ==} the |
| * expected value. This method is guaranteed to be atomic with respect to |
| * other calls to {@code compareAndSet} and {@code set}, but not |
| * necessarily with respect to other changes in the field. |
| * |
| * <p><a href="package-summary.html#weakCompareAndSet">May fail |
| * spuriously and does not provide ordering guarantees</a>, so is |
| * only rarely an appropriate alternative to {@code compareAndSet}. |
| * |
| * @param obj An object whose field to conditionally set |
| * @param expect the expected value |
| * @param update the new value |
| * @return {@code true} if successful |
| * @throws java.lang.ClassCastException if {@code obj} is not an instance |
| * of the class possessing the field established in the constructor |
| */ |
| |
| public abstract boolean weakCompareAndSet(T obj, long expect, long update); |
| |
| /** |
| * Sets the field of the given object managed by this updater to the |
| * given updated value. This operation is guaranteed to act as a volatile |
| * store with respect to subsequent invocations of {@code compareAndSet}. |
| * |
| * @param obj An object whose field to set |
| * @param newValue the new value |
| */ |
| |
| public abstract void set(T obj, long newValue); |
| |
| /** |
| * Eventually sets the field of the given object managed by this |
| * updater to the given updated value. |
| * |
| * @param obj An object whose field to set |
| * @param newValue the new value |
| * @since 1.6 |
| */ |
| |
| public abstract void lazySet(T obj, long newValue); |
| |
| /** |
| * Gets the current value held in the field of the given object managed |
| * by this updater. |
| * |
| * @param obj An object whose field to get |
| * @return the current value |
| */ |
| |
| public abstract long get(T obj); |
| |
| /** |
| * Atomically sets the field of the given object managed by this updater |
| * to the given value and returns the old value. |
| * |
| * @param obj An object whose field to get and set |
| * @param newValue the new value |
| * @return the previous value |
| */ |
| |
| public long getAndSet(T obj, long newValue) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Atomically increments by one the current value of the field of the |
| * given object managed by this updater. |
| * |
| * @param obj An object whose field to get and set |
| * @return the previous value |
| */ |
| |
| public long getAndIncrement(T obj) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Atomically decrements by one the current value of the field of the |
| * given object managed by this updater. |
| * |
| * @param obj An object whose field to get and set |
| * @return the previous value |
| */ |
| |
| public long getAndDecrement(T obj) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Atomically adds the given value to the current value of the field of |
| * the given object managed by this updater. |
| * |
| * @param obj An object whose field to get and set |
| * @param delta the value to add |
| * @return the previous value |
| */ |
| |
| public long getAndAdd(T obj, long delta) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Atomically increments by one the current value of the field of the |
| * given object managed by this updater. |
| * |
| * @param obj An object whose field to get and set |
| * @return the updated value |
| */ |
| |
| public long incrementAndGet(T obj) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Atomically decrements by one the current value of the field of the |
| * given object managed by this updater. |
| * |
| * @param obj An object whose field to get and set |
| * @return the updated value |
| */ |
| |
| public long decrementAndGet(T obj) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Atomically adds the given value to the current value of the field of |
| * the given object managed by this updater. |
| * |
| * @param obj An object whose field to get and set |
| * @param delta the value to add |
| * @return the updated value |
| */ |
| |
| public long addAndGet(T obj, long delta) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * Atomically updates the field of the given object managed by this updater |
| * with the results of applying the given function, 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. |
| * |
| * @param obj An object whose field to get and set |
| * @param updateFunction a side-effect-free function |
| * @return the previous value |
| * @since 1.8 |
| */ |
| |
| public final long getAndUpdate(T obj, java.util.function.LongUnaryOperator updateFunction) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * 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. |
| * |
| * @param obj An object whose field to get and set |
| * @param updateFunction a side-effect-free function |
| * @return the updated value |
| * @since 1.8 |
| */ |
| |
| public final long updateAndGet(T obj, java.util.function.LongUnaryOperator updateFunction) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * 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 long getAndAccumulate(T obj, long x, java.util.function.LongBinaryOperator accumulatorFunction) { throw new RuntimeException("Stub!"); } |
| |
| /** |
| * 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 long accumulateAndGet(T obj, long x, java.util.function.LongBinaryOperator accumulatorFunction) { throw new RuntimeException("Stub!"); } |
| } |
| |
