com.streamsets.datacollector.util.TestSystemProcess.java Source code

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Here is the source code for com.streamsets.datacollector.util.TestSystemProcess.java

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/**
 * Copyright 2015 StreamSets Inc.
 *
 * Licensed under 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 com.streamsets.datacollector.util;

import com.google.common.base.Joiner;
import com.google.common.collect.Iterables;
import com.google.common.io.Files;
import com.streamsets.datacollector.util.SystemProcessImpl;
import com.streamsets.pipeline.api.impl.Utils;

import org.apache.commons.io.FileUtils;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.Assume;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class TestSystemProcess {

    private File tempDir;

    private SystemProcessImpl process;

    @Before
    public void setup() throws Exception {
        tempDir = Files.createTempDir();
    }

    @After
    public void tearDown() {
        if (process != null) {
            process.cleanup();
        }
        if (tempDir != null) {
            FileUtils.deleteQuietly(tempDir);
        }
    }

    @Test
    public void testStart() throws Exception {
        process = new SystemProcessImpl("sleep", tempDir, Arrays.asList("/bin/sleep", "1.1"));
        process.start();
        Assert.assertTrue(process.isAlive());
    }

    @Test
    public void testKill() throws Exception {
        process = new SystemProcessImpl("sleep", tempDir, Arrays.asList("/bin/sleep", "3.1"));
        process.start();
        long start = System.currentTimeMillis();
        process.kill(5000);
        long elapsed = System.currentTimeMillis() - start;
        Assert.assertTrue("Expected elapsed time to be less than 3000: " + elapsed, elapsed < 3000);
    }

    @Test
    public void testForceKill() throws Exception {
        Assume.assumeFalse("Test only works on java 1.8 and newer, not: " + System.getProperty("java.version"),
                System.getProperty("java.version", "").contains("1.7"));
        Assume.assumeTrue("Test only works on linux, not: " + System.getProperty("os.name"),
                System.getProperty("os.name", "").trim().toLowerCase().contains("linux"));
        process = new SystemProcessImpl("sleep", tempDir,
                Arrays.asList("/bin/bash", "-c", "trap true 15; sleep 3.1"));
        process.start();
        long start = System.currentTimeMillis();
        process.kill(5000);
        long elapsed = System.currentTimeMillis() - start;
        Assert.assertTrue("Expected elapsed time to be less than 3000: " + elapsed, elapsed < 3000);
    }

    @Test
    public void testOutput() throws Exception {
        process = new SystemProcessImpl("output", tempDir,
                Arrays.asList("/bin/bash", "-c", "for i in {0..2}; do echo $i; done"));
        process.start();
        while (process.isAlive()) {
            TimeUnit.MILLISECONDS.sleep(10);
        }
        String error = Joiner.on("\n").join(process.getAllError());
        Assert.assertTrue(error, error.isEmpty());
        List<String> lines = new ArrayList<>();
        Iterables.addAll(lines, process.getOutput());
        Assert.assertEquals(Arrays.asList("0", "1", "2"), lines);
    }

    @Test
    public void testError() throws Exception {
        process = new SystemProcessImpl("output", tempDir,
                Arrays.asList("/bin/bash", "-c", "for i in {0..2}; do echo $i 1>&2; done"));
        process.start();
        while (process.isAlive()) {
            TimeUnit.MILLISECONDS.sleep(10);
        }
        String error = Joiner.on("\n").join(process.getAllOutput());
        Assert.assertTrue(error, error.isEmpty());
        List<String> lines = new ArrayList<>();
        Iterables.addAll(lines, process.getError());
        Assert.assertEquals(Arrays.asList("0", "1", "2"), lines);
    }

    @Test
    public void testCleanup() throws Exception {
        for (int i = 0; i < 10; i++) {
            File f = new File(tempDir, Utils.format("file-{}{}", i, SystemProcessImpl.OUT_EXT));
            Assert.assertTrue(f.createNewFile());
        }
        SystemProcessImpl.clean(tempDir, 5);
        String[] expected = tempDir.list();
        Arrays.sort(expected);
        Assert.assertArrayEquals(
                new String[] { "file-5.out", "file-6.out", "file-7.out", "file-8.out", "file-9.out" }, expected);
    }
}