content: /*
   * 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.carbondata.core.locks;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.locks.ReentrantLock;
  import org.apache.carbondata.core.constants.CarbonCommonConstants;
  import org.apache.carbondata.core.util.CarbonProperties;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class CarbonLockFactoryTest {
  
    @Test
    public void testCustomLock() {
      CarbonProperties.getInstance().addProperty(
          CarbonCommonConstants.LOCK_TYPE,
          CarbonCommonConstants.CARBON_LOCK_TYPE_CUSTOM
      );
      CarbonProperties.getInstance().addProperty(
          CarbonCommonConstants.LOCK_CLASS,
          CustomLock.class.getName()
      );
      final List<Thread> threadList = new ArrayList<>(2);
      for (int index = 0; index < 2; index++) {
        threadList.add(new Thread() {
          @Override
          public void run() {
            ICarbonLock lock = CarbonLockFactory.getSystemLevelCarbonLockObj("root", "test");
            // do something.
            try {
              Thread.sleep(1500L);
            } catch (InterruptedException ignore) {
              // ignore.
            }
            lock.unlock();
          }
        });
      }
      final long startTime = System.nanoTime();
      for (Thread thread : threadList) {
        thread.start();
      }
      for (Thread thread : threadList) {
        try {
          thread.join();
        } catch (InterruptedException ignore) {
          // ignore.
        }
      }
      Assert.assertTrue(
          TimeUnit.MILLISECONDS.convert(System.nanoTime() - startTime, TimeUnit.NANOSECONDS) > 3000L
      );
    }
  
    public static final class CustomLock implements ICarbonLock {
  
      private static final ConcurrentHashMap<String, ReentrantLock> LOCK_MAP = new ConcurrentHashMap<>();
  
      private static ReentrantLock getLock(final String lockIdentifier) {
        ReentrantLock lock = LOCK_MAP.get(lockIdentifier);
        if (lock == null) {
          synchronized (LOCK_MAP) {
            lock = LOCK_MAP.get(lockIdentifier);
            if (lock == null) {
              lock = new ReentrantLock();
              LOCK_MAP.put(lockIdentifier, lock);
            }
          }
        }
        return lock;
      }
  
      public CustomLock(final String absoluteLockPath, final String lockFile) {
        this.lockIdentifier = absoluteLockPath + lockFile;
        getLock(this.lockIdentifier).lock();
      }
  
      private final String lockIdentifier;
  
      @Override
      public boolean unlock() {
        getLock(this.lockIdentifier).unlock();
        return true;
      }
  
      @Override
      public boolean lockWithRetries() {
        // TODO
        throw new UnsupportedOperationException();
      }
  
      @Override
      public boolean lockWithRetries(int retryCount, int retryInterval) {
        // TODO
        throw new UnsupportedOperationException();
      }
  
      @Override
      public boolean releaseLockManually(String lockFile) {
        getLock(lockFile).unlock();
        return true;
      }
  
      @Override
      public String getLockFilePath() {
        return this.lockIdentifier;
      }
  
    }
  
  }
  