| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.math.stat.descriptive; |
| |
| /** |
| * Implementation of |
| * {@link org.apache.commons.math.stat.descriptive.DescriptiveStatistics} that |
| * is safe to use in a multithreaded environment. Multiple threads can safely |
| * operate on a single instance without causing runtime exceptions due to race |
| * conditions. In effect, this implementation makes modification and access |
| * methods atomic operations for a single instance. That is to say, as one |
| * thread is computing a statistic from the instance, no other thread can modify |
| * the instance nor compute another statistic. |
| * |
| * @since 1.2 |
| * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $ |
| */ |
| public class SynchronizedDescriptiveStatistics extends DescriptiveStatistics { |
| |
| /** Serialization UID */ |
| private static final long serialVersionUID = 1L; |
| |
| /** |
| * Construct an instance with infinite window |
| */ |
| public SynchronizedDescriptiveStatistics() { |
| this(INFINITE_WINDOW); |
| } |
| |
| /** |
| * Construct an instance with finite window |
| * @param window the finite window size. |
| */ |
| public SynchronizedDescriptiveStatistics(int window) { |
| super(window); |
| } |
| |
| /** |
| * A copy constructor. Creates a deep-copy of the {@code original}. |
| * |
| * @param original the {@code SynchronizedDescriptiveStatistics} instance to copy |
| */ |
| public SynchronizedDescriptiveStatistics(SynchronizedDescriptiveStatistics original) { |
| copy(original, this); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized void addValue(double v) { |
| super.addValue(v); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized double apply(UnivariateStatistic stat) { |
| return super.apply(stat); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized void clear() { |
| super.clear(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized double getElement(int index) { |
| return super.getElement(index); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized long getN() { |
| return super.getN(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized double getStandardDeviation() { |
| return super.getStandardDeviation(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized double[] getValues() { |
| return super.getValues(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized int getWindowSize() { |
| return super.getWindowSize(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized void setWindowSize(int windowSize) { |
| super.setWindowSize(windowSize); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public synchronized String toString() { |
| return super.toString(); |
| } |
| |
| /** |
| * Returns a copy of this SynchronizedDescriptiveStatistics instance with the |
| * same internal state. |
| * |
| * @return a copy of this |
| */ |
| @Override |
| public synchronized SynchronizedDescriptiveStatistics copy() { |
| SynchronizedDescriptiveStatistics result = |
| new SynchronizedDescriptiveStatistics(); |
| copy(this, result); |
| return result; |
| } |
| |
| /** |
| * Copies source to dest. |
| * <p>Neither source nor dest can be null.</p> |
| * <p>Acquires synchronization lock on source, then dest before copying.</p> |
| * |
| * @param source SynchronizedDescriptiveStatistics to copy |
| * @param dest SynchronizedDescriptiveStatistics to copy to |
| * @throws NullPointerException if either source or dest is null |
| */ |
| public static void copy(SynchronizedDescriptiveStatistics source, |
| SynchronizedDescriptiveStatistics dest) { |
| synchronized (source) { |
| synchronized (dest) { |
| DescriptiveStatistics.copy(source, dest); |
| } |
| } |
| } |
| } |