gobblin.util.filesystem.ThrottledFileSystemTest.java Source code

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Here is the source code for gobblin.util.filesystem.ThrottledFileSystemTest.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 gobblin.util.filesystem;

import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.mockito.Mockito;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import org.testng.Assert;
import org.testng.annotations.Test;

import gobblin.util.limiter.CountBasedLimiter;
import gobblin.util.limiter.Limiter;
import gobblin.util.limiter.NotEnoughPermitsException;

public class ThrottledFileSystemTest {

    @Test
    public void testSimpleCalls() throws Exception {
        FileSystem fs = Mockito.mock(FileSystem.class);
        Mockito.when(fs.getFileStatus(Mockito.any(Path.class)))
                .thenReturn(new FileStatus(0, false, 0, 0, 0, new Path("/")));

        Limiter limiter = new CountBasedLimiter(2);

        ThrottledFileSystem throttledFileSystem = new ThrottledFileSystem(fs, limiter);

        Assert.assertNotNull(throttledFileSystem.getFileStatus(new Path("/myFile")));
        Assert.assertNotNull(throttledFileSystem.getFileStatus(new Path("/myFile")));
        try {
            throttledFileSystem.getFileStatus(new Path("/myFile"));
            Assert.fail();
        } catch (NotEnoughPermitsException expected) {
            // Expected
        }

    }

    @Test
    public void testListing() throws Exception {
        FileSystem fs = Mockito.mock(FileSystem.class);
        Mockito.when(fs.listStatus(Mockito.any(Path.class))).thenAnswer(new Answer<FileStatus[]>() {
            @Override
            public FileStatus[] answer(InvocationOnMock invocation) throws Throwable {
                Path path = (Path) invocation.getArguments()[0];
                int files = Integer.parseInt(path.getName());

                FileStatus status = new FileStatus(0, false, 0, 0, 0, new Path("/"));
                FileStatus[] out = new FileStatus[files];
                for (int i = 0; i < files; i++) {
                    out[i] = status;
                }

                return out;
            }
        });

        Limiter limiter = new CountBasedLimiter(5);

        ThrottledFileSystem throttledFileSystem = new ThrottledFileSystem(fs, limiter);

        Assert.assertNotNull(throttledFileSystem.listStatus(new Path("/files/99"))); // use 1 permit
        Assert.assertNotNull(throttledFileSystem.listStatus(new Path("/files/250"))); // use 3 permits
        try {
            throttledFileSystem.listStatus(new Path("/files/150")); // requires 2 permits
            Assert.fail();
        } catch (NotEnoughPermitsException expected) {
            // Expected
        }
        Assert.assertNotNull(throttledFileSystem.listStatus(new Path("/files/99"))); // requires 1 permit
    }

}