ReadLockTest.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 */

package org.glassfish.common.util.admin.locking;

import junit.framework.Assert;
import org.glassfish.common.util.admin.ManagedFile;
import org.junit.Ignore;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.locks.Lock;

/**
 * Tests for ManagedFile.accessRead() method
 * @author Jerome Dochez
 */
public class ReadLockTest {

    @Test
    public void readLock() throws IOException {

        File f = getFile();
        try {
            //System.out.println("trying the lock on " + f.getAbsolutePath());
            final ManagedFile managed = new ManagedFile(f, 1000, 1000);
            Lock fl = managed.accessRead();
            //System.out.println("Got the lock on " + f.getAbsolutePath());
            List<Future<Boolean>> results = new ArrayList<Future<Boolean>>(5);
            for (int i=0;i<5;i++) {
                results.add(Executors.newFixedThreadPool(2).submit(new Callable<Boolean>() {
                    @Override
                    public Boolean call() throws Exception {
                        try {
                            Lock second = managed.accessRead();
                            second.unlock();
                        } catch (IOException e) {
                            throw new RuntimeException(e);
                        }
                        return Boolean.TRUE;
                    }
                }));
            }
            Thread.sleep(100);
            fl.unlock();
            for (Future<Boolean> result : results) {
                Boolean exitCode = result.get();
                Assert.assertEquals(exitCode.booleanValue(), true);
            }
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    


    public File getFile() throws IOException {
        Enumeration<URL> urls = getClass().getClassLoader().getResources("adminport.xml");
        if (urls.hasMoreElements()) {
            try {
                File f = new File(urls.nextElement().toURI());
                if (f.exists()) {
                    return f;
                }
            } catch (URISyntaxException e) {
                throw new IOException(e);
            }
        } else {
            //System.out.println("Not found !");
        }
        return null;
    }    
}