package org.eclipse.aether.named.hazelcast;
   
   /*
    * 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.
   */
  
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  import java.util.concurrent.TimeUnit;
  
  import com.hazelcast.core.HazelcastInstance;
  import com.hazelcast.cp.ISemaphore;
  import org.eclipse.aether.named.support.AdaptedSemaphoreNamedLock;
  import org.eclipse.aether.named.support.AdaptedSemaphoreNamedLock.AdaptedSemaphore;
  import org.eclipse.aether.named.support.NamedLockFactorySupport;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Factory of {@link AdaptedSemaphoreNamedLock} instances, using adapted Hazelcast {@link ISemaphore}. It delegates
   * most the work to {@link HazelcastSemaphoreProvider} and this class just adapts the returned semaphore to named lock
   * and caches {@link ISemaphore} instances, as recommended by Hazelcast.
   */
  public class HazelcastSemaphoreNamedLockFactory
          extends NamedLockFactorySupport
  {
      protected final HazelcastInstance hazelcastInstance;
  
      protected final boolean manageHazelcast;
  
      private final HazelcastSemaphoreProvider hazelcastSemaphoreProvider;
  
      private final ConcurrentMap<String, ISemaphore> semaphores;
  
      public HazelcastSemaphoreNamedLockFactory(
              final HazelcastInstance hazelcastInstance,
              final boolean manageHazelcast,
              final HazelcastSemaphoreProvider hazelcastSemaphoreProvider
      )
      {
          this.hazelcastInstance = requireNonNull( hazelcastInstance );
          this.manageHazelcast = manageHazelcast;
          this.hazelcastSemaphoreProvider = requireNonNull( hazelcastSemaphoreProvider );
          this.semaphores = new ConcurrentHashMap<>();
      }
  
      @Override
      protected AdaptedSemaphoreNamedLock createLock( final String name )
      {
          ISemaphore semaphore = semaphores.computeIfAbsent( name,
                  k -> hazelcastSemaphoreProvider.acquireSemaphore( hazelcastInstance, name ) );
          return new AdaptedSemaphoreNamedLock( name, this, new HazelcastSemaphore( semaphore ) );
      }
  
      @Override
      protected void destroyLock( final String name )
      {
          hazelcastSemaphoreProvider.releaseSemaphore( hazelcastInstance, name, semaphores.remove( name ) );
      }
  
      @Override
      public void shutdown()
      {
          if ( manageHazelcast )
          {
              hazelcastInstance.shutdown();
          }
      }
  
      private static final class HazelcastSemaphore implements AdaptedSemaphore
      {
          private final ISemaphore semaphore;
  
          private HazelcastSemaphore( final ISemaphore semaphore )
          {
              this.semaphore = semaphore;
          }
  
          @Override
          public boolean tryAcquire( final int perms, final long time, final TimeUnit unit )
                  throws InterruptedException
          {
              return semaphore.tryAcquire( perms, time, unit );
          }
 
         @Override
         public void release( final int perms )
         {
             semaphore.release( perms );
         }
     }
 }