org.springframework.beans.ConcurrentBeanWrapperTests.java Source code

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Here is the source code for org.springframework.beans.ConcurrentBeanWrapperTests.java

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/*
 * Copyright 2002-2013 the original author or authors.
 *
 * Licensed 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.springframework.beans;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Test;

import static org.junit.Assert.*;

/**
 * @author Guillaume Poirier
 * @author Juergen Hoeller
 * @author Chris Beams
 * @since 08.03.2004
 */
public class ConcurrentBeanWrapperTests {

    private final Log logger = LogFactory.getLog(getClass());

    private Set<TestRun> set = Collections.synchronizedSet(new HashSet<TestRun>());

    private Throwable ex = null;

    @Test
    public void testSingleThread() {
        for (int i = 0; i < 100; i++) {
            performSet();
        }
    }

    @Test
    public void testConcurrent() {
        for (int i = 0; i < 10; i++) {
            TestRun run = new TestRun(this);
            set.add(run);
            Thread t = new Thread(run);
            t.setDaemon(true);
            t.start();
        }
        logger.info("Thread creation over, " + set.size() + " still active.");
        synchronized (this) {
            while (!set.isEmpty() && ex == null) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    logger.info(e.toString());
                }
                logger.info(set.size() + " threads still active.");
            }
        }
        if (ex != null) {
            fail(ex.getMessage());
        }
    }

    private static void performSet() {
        TestBean bean = new TestBean();

        Properties p = (Properties) System.getProperties().clone();

        assertTrue("The System properties must not be empty", p.size() != 0);

        for (Iterator<?> i = p.entrySet().iterator(); i.hasNext();) {
            i.next();
            if (Math.random() > 0.9) {
                i.remove();
            }
        }

        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        try {
            p.store(buffer, null);
        } catch (IOException e) {
            // ByteArrayOutputStream does not throw
            // any IOException
        }
        String value = new String(buffer.toByteArray());

        BeanWrapperImpl wrapper = new BeanWrapperImpl(bean);
        wrapper.setPropertyValue("properties", value);
        assertEquals(p, bean.getProperties());
    }

    private static class TestRun implements Runnable {

        private ConcurrentBeanWrapperTests test;

        public TestRun(ConcurrentBeanWrapperTests test) {
            this.test = test;
        }

        @Override
        public void run() {
            try {
                for (int i = 0; i < 100; i++) {
                    performSet();
                }
            } catch (Throwable e) {
                test.ex = e;
            } finally {
                synchronized (test) {
                    test.set.remove(this);
                    test.notifyAll();
                }
            }
        }
    }

    @SuppressWarnings("unused")
    private static class TestBean {

        private Properties properties;

        public Properties getProperties() {
            return properties;
        }

        public void setProperties(Properties properties) {
            this.properties = properties;
        }
    }

}