ch.sourcepond.io.checksum.impl.PathUpdateStrategyTest.java Source code

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Here is the source code for ch.sourcepond.io.checksum.impl.PathUpdateStrategyTest.java

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/*Copyright (C) 2015 Roland Hauser, <sourcepond@gmail.com>
    
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 ch.sourcepond.io.checksum.impl;

import static ch.sourcepond.io.checksum.api.Algorithm.SHA256;
import static java.nio.file.FileSystems.getDefault;
import static java.nio.file.Files.createFile;
import static java.nio.file.Files.deleteIfExists;
import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static org.apache.commons.codec.binary.Hex.encodeHexString;
import static org.apache.commons.lang3.SystemUtils.JAVA_IO_TMPDIR;
import static org.apache.commons.lang3.SystemUtils.USER_DIR;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;

import java.nio.file.Path;
import java.security.NoSuchAlgorithmException;
import java.util.concurrent.ScheduledExecutorService;

import org.junit.Test;

import ch.sourcepond.io.checksum.api.Algorithm;

/**
 * @author rolandhauser
 *
 */
public class PathUpdateStrategyTest {

    private final ScheduledExecutorService executor = newSingleThreadScheduledExecutor();
    private final Path resources = getDefault().getPath(USER_DIR, "src", "test", "resources");
    private final Path realFile = resources.resolve("first_content.txt");
    private final UpdateStrategyFactory strategyFactory = new UpdateStrategyFactory();
    private PathUpdateStrategy strategy;

    private PathUpdateStrategy newStrategy(final Algorithm pAlgorithm, final Path pPath)
            throws NoSuchAlgorithmException {
        return (PathUpdateStrategy) strategyFactory.newStrategy(pAlgorithm.toString(), pPath);
    }

    /**
     * @throws Exception
     */
    @Test
    public void verifyWalkDirectoryTree() throws Exception {
        strategy = newStrategy(SHA256, resources);
        synchronized (strategy) {
            strategy.update(5000, MILLISECONDS);
        }
        final byte[] result = strategy.digest();
        assertEquals("dd3e119c99983d19b13fd51020f0f2562cde3788e5d36b7666b961bb159f16c8", encodeHexString(result));
    }

    /**
     * 
     */
    @Test
    public void verifyUpdateDigestWithRealFile() throws Exception {
        strategy = newStrategy(SHA256, realFile);
        strategy.update(0, MILLISECONDS);
        final byte[] result = strategy.digest();
        assertEquals("40ab41c711d6979c8bfb9dae2022d79e4fa43b79bf5c74cc8d291936586a4778", encodeHexString(result));
    }

    /**
     * 
     */
    @Test(timeout = 2000)
    public void verifyUpdateDigestGCRun() throws Exception {
        strategy = newStrategy(SHA256, realFile);
        final long objectIdentityBeforeGC = System.identityHashCode(strategy.getTempBuffer());

        // Call to update will set the hard-reference tempBuffer to null. This
        // is necessary, otherwise the weak-reference will not be cleared.
        strategy.update(0, MILLISECONDS);

        // After running the garbage collector the weak-references should have
        // been cleared.
        System.gc();
        assertNotEquals(objectIdentityBeforeGC, System.identityHashCode(strategy.getTempBuffer()));
    }

    @Test
    public void verifyMoreContentWhileWaitingAfterEOF() throws Exception {
        final Path testFile = getDefault().getPath(JAVA_IO_TMPDIR, "morecontent.txt");
        deleteIfExists(testFile);
        createFile(testFile);
        try {
            strategy = newStrategy(SHA256, testFile);
            executor.schedule(new TestDataWriter(testFile, "abcdefg"), 500, MILLISECONDS);
            executor.schedule(new TestDataWriter(testFile, "hijklmn"), 1000, MILLISECONDS);
            executor.schedule(new TestDataWriter(testFile, "opqrstu"), 1500, MILLISECONDS);
            synchronized (strategy) {
                strategy.update(1000, MILLISECONDS);
            }
        } finally {
            deleteIfExists(testFile);
        }
        assertEquals("25f62a5a3d414ec6e20907df7f367f2b72625aade552db64c07933f6044fc49a",
                encodeHexString(strategy.digest()));
    }
}