com.gemstone.gemfire.internal.process.LocalProcessLauncherJUnitTest Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of gemfire-junit Show documentation
SnappyData store based off Pivotal GemFireXD
There is a newer version: 2.0-BETA
/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * Licensed 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal.process;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

import com.gemstone.gemfire.internal.OSProcess;
import com.gemstone.gemfire.internal.process.LocalProcessLauncher;

import junit.framework.TestCase;

/**
 * Unit tests for ProcessLauncher.
 * 
 * @author Kirk Lund
 * @since 7.0
 */
public class LocalProcessLauncherJUnitTest extends TestCase {

  public LocalProcessLauncherJUnitTest(String name) {
    super(name);
  }
  
  @Override
  public void setUp() throws Exception {
    super.setUp();
    new File(getClass().getSimpleName()).mkdir();
  }
  
  @Override
  public void tearDown() throws Exception {
    super.tearDown();
  }
  
  public void testPidAccuracy() throws PidUnavailableException {
    int pid = ProcessUtils.identifyPid();
    assertTrue(pid > 0);
    int osProcessPid = OSProcess.getId();
    if (osProcessPid > 0) {
      assertEquals(OSProcess.getId(), pid);
    } else {
      // not much to test if OSProcess native code is unusable
    }
  }
  
  public void testPidFileIsCreated() throws Exception {
    final File pidFile = new File(getClass().getSimpleName() 
        + File.separator + "testPidFileIsCreated.pid");
    assertFalse(pidFile.exists());
    new LocalProcessLauncher(pidFile, false);
    assertTrue(pidFile.exists());
  }
  
  public void testPidFileContainsPid() throws Exception {
    final File pidFile = new File(getClass().getSimpleName() 
        + File.separator + "testPidFileContainsPid.pid");
    final LocalProcessLauncher launcher = new LocalProcessLauncher(pidFile, false);
    assertNotNull(launcher);
    assertTrue(pidFile.exists());
    
    final FileReader fr = new FileReader(pidFile);
    final BufferedReader br = new BufferedReader(fr);
    final int pid = Integer.parseInt(br.readLine());
    br.close();
    
    assertTrue(pid > 0);
    assertEquals(launcher.getPid(), pid);
    assertEquals(ProcessUtils.identifyPid(), pid);
  }
  
  public void testPidFileIsCleanedUp() throws Exception {
    final File pidFile = new File(getClass().getSimpleName() 
        + File.separator + "testPidFileIsCleanedUp.pid");
    final LocalProcessLauncher launcher = new LocalProcessLauncher(pidFile, false);
    assertTrue(pidFile.exists());
    launcher.close(); // TODO: launch an external JVM and then close it nicely
    assertFalse(pidFile.exists());
  }
  
  public void testExistingPidFileThrows() throws Exception {
    final File pidFile = new File(getClass().getSimpleName() 
        + File.separator + "testExistingPidFileThrows.pid");
    assertTrue(pidFile.createNewFile());
    assertTrue(pidFile.exists());
    
    final FileWriter writer = new FileWriter(pidFile);
    // use a read pid that exists
    writer.write(String.valueOf(ProcessUtils.identifyPid()));
    writer.close();

    try {
      new LocalProcessLauncher(pidFile, false);
      fail("LocalProcessLauncher should have thrown FileAlreadyExistsException");
    } catch (FileAlreadyExistsException e) {
      // passed
    }
  }

  public void testStalePidFileIsReplaced() throws Exception {
    final File pidFile = new File(getClass().getSimpleName() 
        + File.separator + "testStalePidFileIsReplaced.pid");
    assertTrue(pidFile.createNewFile());
    assertTrue(pidFile.exists());
    
    final FileWriter writer = new FileWriter(pidFile);
    writer.write(String.valueOf(Integer.MAX_VALUE));
    writer.close();

    try {
      new LocalProcessLauncher(pidFile, false);
    } catch (FileAlreadyExistsException e) {
      fail("LocalProcessLauncher should not have thrown FileAlreadyExistsException");
    }

    final FileReader fr = new FileReader(pidFile);
    final BufferedReader br = new BufferedReader(fr);
    final int pid = Integer.parseInt(br.readLine());
    br.close();

    assertTrue(pid > 0);
    assertEquals(ProcessUtils.identifyPid(), pid);
  }

  public void testForceReplacesExistingPidFile() throws Exception {
    assertTrue("testForceReplacesExistingPidFile is broken if PID == Integer.MAX_VALUE", 
        ProcessUtils.identifyPid() != Integer.MAX_VALUE);
    
    final File pidFile = new File(getClass().getSimpleName() 
        + File.separator + "testForceReplacesExistingPidFile.pid");
    assertTrue(pidFile.createNewFile());
    assertTrue(pidFile.exists());
    
    final FileWriter writer = new FileWriter(pidFile);
    writer.write(String.valueOf(Integer.MAX_VALUE));
    writer.close();
    
    try {
      new LocalProcessLauncher(pidFile, true);
    } catch (FileAlreadyExistsException e) {
      fail("LocalProcessLauncher should not have thrown FileAlreadyExistsException");
    }

    final FileReader fr = new FileReader(pidFile);
    final BufferedReader br = new BufferedReader(fr);
    final int pid = Integer.parseInt(br.readLine());
    br.close();

    assertTrue(pid > 0);
    assertEquals(ProcessUtils.identifyPid(), pid);
  }
  
  public void testPidUnavailableThrows() {
    final String name = "Name without PID";
    try {
      ProcessUtils.identifyPid(name);
      fail("PidUnavailableException should have been thrown for " + name);
    } catch (PidUnavailableException e) {
     // passed
    }
  }
}