org.apache.hadoop.hdfs.TestFileInputStreamCache.java Source code

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Here is the source code for org.apache.hadoop.hdfs.TestFileInputStreamCache.java

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/**
 * 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.hadoop.hdfs;

import junit.framework.Assert;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.net.unix.TemporarySocketDirectory;
import org.junit.Test;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class TestFileInputStreamCache {
    static final Log LOG = LogFactory.getLog(TestFileInputStreamCache.class);

    @Test
    public void testCreateAndDestroy() throws Exception {
        FileInputStreamCache cache = new FileInputStreamCache(10, 1000);
        cache.close();
    }

    private static class TestFileDescriptorPair {
        TemporarySocketDirectory dir = new TemporarySocketDirectory();
        FileInputStream fis[];

        public TestFileDescriptorPair() throws IOException {
            fis = new FileInputStream[2];
            for (int i = 0; i < 2; i++) {
                String name = dir.getDir() + "/file" + i;
                FileOutputStream fos = new FileOutputStream(name);
                fos.write(1);
                fos.close();
                fis[i] = new FileInputStream(name);
            }
        }

        public FileInputStream[] getFileInputStreams() {
            return fis;
        }

        public void close() throws IOException {
            IOUtils.cleanup(LOG, fis);
            dir.close();
        }

        public boolean compareWith(FileInputStream other[]) {
            if ((other == null) || (fis == null)) {
                return other == fis;
            }
            if (fis.length != other.length)
                return false;
            for (int i = 0; i < fis.length; i++) {
                if (fis[i] != other[i])
                    return false;
            }
            return true;
        }
    }

    @Test
    public void testAddAndRetrieve() throws Exception {
        FileInputStreamCache cache = new FileInputStreamCache(1, 1000000);
        DatanodeID dnId = new DatanodeID("127.0.0.1", "localhost", "xyzzy", 8080, 9090, 7070, 6060);
        ExtendedBlock block = new ExtendedBlock("poolid", 123);
        TestFileDescriptorPair pair = new TestFileDescriptorPair();
        cache.put(dnId, block, pair.getFileInputStreams());
        FileInputStream fis[] = cache.get(dnId, block);
        Assert.assertTrue(pair.compareWith(fis));
        pair.close();
        cache.close();
    }

    @Test
    public void testExpiry() throws Exception {
        FileInputStreamCache cache = new FileInputStreamCache(1, 10);
        DatanodeID dnId = new DatanodeID("127.0.0.1", "localhost", "xyzzy", 8080, 9090, 7070, 6060);
        ExtendedBlock block = new ExtendedBlock("poolid", 123);
        TestFileDescriptorPair pair = new TestFileDescriptorPair();
        cache.put(dnId, block, pair.getFileInputStreams());
        Thread.sleep(cache.getExpiryTimeMs() * 100);
        FileInputStream fis[] = cache.get(dnId, block);
        Assert.assertNull(fis);
        pair.close();
        cache.close();
    }

    @Test
    public void testEviction() throws Exception {
        FileInputStreamCache cache = new FileInputStreamCache(1, 10000000);
        DatanodeID dnId = new DatanodeID("127.0.0.1", "localhost", "xyzzy", 8080, 9090, 7070, 6060);
        ExtendedBlock block = new ExtendedBlock("poolid", 123);
        TestFileDescriptorPair pair = new TestFileDescriptorPair();
        cache.put(dnId, block, pair.getFileInputStreams());
        DatanodeID dnId2 = new DatanodeID("127.0.0.1", "localhost", "xyzzy", 8081, 9091, 7071, 6061);
        TestFileDescriptorPair pair2 = new TestFileDescriptorPair();
        cache.put(dnId2, block, pair2.getFileInputStreams());
        FileInputStream fis[] = cache.get(dnId, block);
        Assert.assertNull(fis);
        FileInputStream fis2[] = cache.get(dnId2, block);
        Assert.assertTrue(pair2.compareWith(fis2));
        pair.close();
        cache.close();
    }
}