org.apache.lens.server.session.TestDatabaseResourceService.java Source code

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Here is the source code for org.apache.lens.server.session.TestDatabaseResourceService.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.lens.server.session;

import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.apache.lens.server.LensTestUtil;
import org.apache.lens.server.api.LensConfConstants;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.conf.HiveConf;

import org.apache.hadoop.hive.ql.metadata.Hive;

import org.testng.Assert;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

public class TestDatabaseResourceService {
    private static final String DB_PFX = TestDatabaseResourceService.class.getSimpleName();
    public static final Log LOG = LogFactory.getLog(TestDatabaseResourceService.class);
    public static final String TEST_CLASS = "ClassLoaderTestClass";

    private static final String DB1 = DB_PFX + "db1";
    private static final String DB2 = DB_PFX + "db2";

    private final String[] testDatabases = { DB1, DB2 };

    private final HiveConf conf = new HiveConf(TestDatabaseResourceService.class);
    private DatabaseResourceService dbResService;

    @BeforeClass
    public void setup() throws Exception {
        LensTestUtil.createTestDatabaseResources(testDatabases, conf);
        // Start resource service.
        conf.set(LensConfConstants.DATABASE_RESOURCE_DIR, "target/resources");
        dbResService = new DatabaseResourceService(DatabaseResourceService.NAME);
        dbResService.init(conf);
        dbResService.start();
    }

    @AfterClass
    public void tearDown() throws Exception {
        Hive hive = Hive.get(conf);
        for (String db : testDatabases) {
            hive.dropDatabase(db, true, true);
        }
    }

    @Test
    public void testClassLoaderCreated() throws Exception {
        ClassLoader db1Loader = dbResService.getClassLoader(DB1);
        ClassLoader db2Loader = dbResService.getClassLoader(DB2);

        Assert.assertNotNull(db1Loader);
        Assert.assertNotNull(db2Loader);
        Assert.assertTrue(db1Loader != db2Loader);
    }

    private boolean isJarLoaded(ClassLoader loader, String db) throws Exception {
        URLClassLoader db1Loader = (URLClassLoader) loader;

        for (URL url : db1Loader.getURLs()) {
            String jarFile = url.getPath();
            if (jarFile.endsWith(db + ".jar")) {
                LOG.info("Found jar url " + url.toString());
                return true;
            }
        }
        return false;
    }

    @Test
    public void testJarsLoaded() throws Exception {
        // Verify that each db's classloader contains corresponding jar
        Assert.assertTrue(isJarLoaded(dbResService.getClassLoader(DB1), DB1), DB1 + " jar should be loaded");
        Assert.assertTrue(isJarLoaded(dbResService.getClassLoader(DB2), DB2), DB2 + " jar should be loaded");

        // Verify DB1 loader does not contain DB2's jar and vice versa
        Assert.assertFalse(isJarLoaded(dbResService.getClassLoader(DB2), DB1));
        Assert.assertFalse(isJarLoaded(dbResService.getClassLoader(DB1), DB2));
    }

    @Test
    public void testJarOrder() throws Exception {
        Collection<LensSessionImpl.ResourceEntry> actualOrder = dbResService.getResourcesForDatabase(DB1);
        List<String> actualOrderList = new ArrayList<String>();

        for (LensSessionImpl.ResourceEntry res : actualOrder) {
            actualOrderList.add(res.getLocation());
        }

        String[] expectedOrderArr = { "z_" + DB1 + ".jar", "y_" + DB1 + ".jar", "x_" + DB1 + ".jar", };

        // Verify order
        for (int i = 0; i < expectedOrderArr.length; i++) {
            Assert.assertTrue(actualOrderList.get(i).contains(expectedOrderArr[i]),
                    actualOrderList.get(i) + " > " + expectedOrderArr[i]);
        }
    }

    @Test
    public void verifyClassLoader() throws Exception {
        // Should fail now since current classloader doesn't have jar loaded
        try {
            Class clz = Class.forName("ClassLoaderTestClass", true, getClass().getClassLoader());
            Assert.fail("Expected class loading to fail");
        } catch (Throwable th) {
            LOG.error("Expected error " + th + " msg = " + th.getMessage());
        }

        // Should pass now
        Class clz = Class.forName(TEST_CLASS, true, dbResService.getClassLoader(DB1));
        Assert.assertNotNull(clz);
    }
}