org.apache.hadoop.gateway.services.topology.DefaultTopologyServiceTest.java Source code

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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.gateway.services.topology;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.monitor.FileAlterationMonitor;
import org.apache.commons.io.monitor.FileAlterationObserver;
import org.apache.hadoop.gateway.config.GatewayConfig;
import org.apache.hadoop.gateway.services.topology.impl.DefaultTopologyService;
import org.apache.hadoop.gateway.topology.*;
import org.apache.hadoop.test.TestUtils;
import org.easymock.EasyMock;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.*;

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.Matchers.hasItem;
import static org.hamcrest.core.IsNull.notNullValue;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

public class DefaultTopologyServiceTest {

    @Before
    public void setUp() throws Exception {
    }

    @After
    public void tearDown() throws Exception {
    }

    private File createDir() throws IOException {
        return TestUtils.createTempDir(this.getClass().getSimpleName() + "-");
    }

    private File createFile(File parent, String name, String resource, long timestamp) throws IOException {
        File file = new File(parent, name);
        if (!file.exists()) {
            FileUtils.touch(file);
        }
        InputStream input = ClassLoader.getSystemResourceAsStream(resource);
        OutputStream output = FileUtils.openOutputStream(file);
        IOUtils.copy(input, output);
        //KNOX-685: output.flush();
        input.close();
        output.close();
        file.setLastModified(timestamp);
        assertTrue("Failed to create test file " + file.getAbsolutePath(), file.exists());
        assertTrue("Failed to populate test file " + file.getAbsolutePath(), file.length() > 0);

        return file;
    }

    @Test
    public void testGetTopologies() throws Exception {

        File dir = createDir();
        long time = dir.lastModified();
        try {
            createFile(dir, "one.xml", "org/apache/hadoop/gateway/topology/file/topology-one.xml", time);

            TestTopologyListener topoListener = new TestTopologyListener();
            FileAlterationMonitor monitor = new FileAlterationMonitor(Long.MAX_VALUE);

            TopologyService provider = new DefaultTopologyService();
            Map<String, String> c = new HashMap<>();

            GatewayConfig config = EasyMock.createNiceMock(GatewayConfig.class);
            EasyMock.expect(config.getGatewayTopologyDir()).andReturn(dir.toString()).anyTimes();
            EasyMock.replay(config);

            provider.init(config, c);

            provider.addTopologyChangeListener(topoListener);

            provider.reloadTopologies();

            Collection<Topology> topologies = provider.getTopologies();
            assertThat(topologies, notNullValue());
            assertThat(topologies.size(), is(1));
            Topology topology = topologies.iterator().next();
            assertThat(topology.getName(), is("one"));
            assertThat(topology.getTimestamp(), is(time));
            assertThat(topoListener.events.size(), is(1));
            topoListener.events.clear();

            // Add a file to the directory.
            File two = createFile(dir, "two.xml", "org/apache/hadoop/gateway/topology/file/topology-two.xml", 1L);
            provider.reloadTopologies();
            topologies = provider.getTopologies();
            assertThat(topologies.size(), is(2));
            Set<String> names = new HashSet<>(Arrays.asList("one", "two"));
            Iterator<Topology> iterator = topologies.iterator();
            topology = iterator.next();
            assertThat(names, hasItem(topology.getName()));
            names.remove(topology.getName());
            topology = iterator.next();
            assertThat(names, hasItem(topology.getName()));
            names.remove(topology.getName());
            assertThat(names.size(), is(0));
            assertThat(topoListener.events.size(), is(1));
            List<TopologyEvent> events = topoListener.events.get(0);
            assertThat(events.size(), is(1));
            TopologyEvent event = events.get(0);
            assertThat(event.getType(), is(TopologyEvent.Type.CREATED));
            assertThat(event.getTopology(), notNullValue());

            // Update a file in the directory.
            two = createFile(dir, "two.xml", "org/apache/hadoop/gateway/topology/file/topology-three.xml", 2L);
            provider.reloadTopologies();
            topologies = provider.getTopologies();
            assertThat(topologies.size(), is(2));
            names = new HashSet<>(Arrays.asList("one", "two"));
            iterator = topologies.iterator();
            topology = iterator.next();
            assertThat(names, hasItem(topology.getName()));
            names.remove(topology.getName());
            topology = iterator.next();
            assertThat(names, hasItem(topology.getName()));
            names.remove(topology.getName());
            assertThat(names.size(), is(0));

            // Remove a file from the directory.
            two.delete();
            provider.reloadTopologies();
            topologies = provider.getTopologies();
            assertThat(topologies.size(), is(1));
            topology = topologies.iterator().next();
            assertThat(topology.getName(), is("one"));
            assertThat(topology.getTimestamp(), is(time));
        } finally {
            FileUtils.deleteQuietly(dir);
        }
    }

    private void kickMonitor(FileAlterationMonitor monitor) {
        for (FileAlterationObserver observer : monitor.getObservers()) {
            observer.checkAndNotify();
        }
    }

    @Test
    public void testProviderParamsOrderIsPreserved() {

        Provider provider = new Provider();
        String names[] = { "ldapRealm=", "ldapContextFactory", "ldapRealm.contextFactory", "ldapGroupRealm",
                "ldapGroupRealm.contextFactory", "ldapGroupRealm.contextFactory.systemAuthenticationMechanism" };

        Param param = null;
        for (String name : names) {
            param = new Param();
            param.setName(name);
            param.setValue(name);
            provider.addParam(param);

        }
        Map<String, String> params = provider.getParams();
        Set<String> keySet = params.keySet();
        Iterator<String> iter = keySet.iterator();
        int i = 0;
        while (iter.hasNext()) {
            assertTrue(iter.next().equals(names[i++]));
        }

    }

    private class TestTopologyListener implements TopologyListener {

        public ArrayList<List<TopologyEvent>> events = new ArrayList<List<TopologyEvent>>();

        @Override
        public void handleTopologyEvent(List<TopologyEvent> events) {
            this.events.add(events);
        }

    }

}