hbase-oss/src/test/java/org/apache/hadoop/hbase/oss/TestCreateNonRecursive.java

/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.hbase.oss;

import java.io.IOException;
import java.util.ArrayList;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadPoolExecutor;
import org.apache.hadoop.fs.FileAlreadyExistsException;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.junit.Assert;
import org.junit.Test;

public class TestCreateNonRecursive extends HBaseObjectStoreSemanticsTest {

  @Test
  public void testCreateNonRecursiveSerial() throws Exception {
    Path serialPath = testPath("testCreateNonRecursiveSerial");
    try {
      FSDataOutputStream out;

      out = hboss.createNonRecursive(serialPath, false, 1024, (short)1, 1024, null);
      out.close();

      boolean exceptionThrown = false;
      try {
        out = hboss.createNonRecursive(serialPath, false, 1024, (short)1, 1024, null);
      } catch(FileAlreadyExistsException e) {
        exceptionThrown = true;
      }
      if (!exceptionThrown) {
        Assert.fail("Second call to createNonRecursive should throw FileAlreadyExistsException, but didn't.");
      }
    } finally {
      hboss.delete(serialPath);
    }
  }

  @Test
  public void testCreateNonRecursiveParallel() throws Exception {
    int experiments = 10;
    int experimentSize = 10;
    for (int e = 0; e < experiments; e++) {
      ArrayList<Callable<Boolean>> callables = new ArrayList<Callable<Boolean>>(experimentSize);
      ArrayList<Future<Boolean>> futures = new ArrayList<Future<Boolean>>(experimentSize);

      Path parallelPath = testPath("testCreateNonRecursiveParallel" + e);
      ThreadPoolExecutor executor = (ThreadPoolExecutor)Executors.newFixedThreadPool(10);
      executor.prestartAllCoreThreads();
      for (int i = 0; i < experimentSize; i++) {
        callables.add(new Callable<Boolean>() {
          public Boolean call() throws IOException {
            FSDataOutputStream out = null;
            boolean exceptionThrown = false;
            try {
              out = hboss.createNonRecursive(parallelPath, false, 1024, (short)1, 1024, null);
            } catch(FileAlreadyExistsException e) {
              exceptionThrown = true;
            } finally {
              if (out != null) {
                out.close();
              }
            }
            return exceptionThrown;
          }
        });
      }
      try {
        for (Callable callable : callables) {
          // This is in a separate loop to try and get them all as overlapped as possible
          futures.add(executor.submit(callable));
        }
        int exceptionsThrown = 0;
        for (Future<Boolean> future : futures) {
          // This is in a separate loop to try and get them all as overlapped as possible
          if (future.get()) {
            exceptionsThrown++;
          }
        }
        Assert.assertEquals("All but exactly 1 call should have thrown exceptions. " +
              "Experiment " + (e+1) + " of " + experiments + ".",
              experimentSize - 1, exceptionsThrown);
      } finally {
        hboss.delete(parallelPath);
      }
    }
  }
}