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 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 java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  import java.util.concurrent.TimeUnit;
  import java.util.function.BiFunction;
  
  /**
   * Factory of {@link AdaptedSemaphoreNamedLock} instances using adapted Hazelcast {@link ISemaphore}. This class may
   * use {@link HazelcastInstance} backed by Hazelcast Server or Hazelcast Client.
   */
  public class HazelcastSemaphoreNamedLockFactory
      extends NamedLockFactorySupport
  {
      protected static final String NAME_PREFIX = "maven:resolver:";
  
      private final HazelcastInstance hazelcastInstance;
  
      private final BiFunction<HazelcastInstance, String, ISemaphore> semaphoreFunction;
  
      private final boolean destroySemaphore;
  
      private final boolean manageHazelcast;
  
      private final ConcurrentMap<String, ISemaphore> semaphores;
  
      public HazelcastSemaphoreNamedLockFactory(
          final HazelcastInstance hazelcastInstance,
          final BiFunction<HazelcastInstance, String, ISemaphore> semaphoreFunction,
          final boolean destroySemaphore,
          final boolean manageHazelcast
      )
      {
          this.hazelcastInstance = hazelcastInstance;
          this.semaphoreFunction = semaphoreFunction;
          this.destroySemaphore = destroySemaphore;
          this.manageHazelcast = manageHazelcast;
          this.semaphores = new ConcurrentHashMap<>();
      }
  
      @Override
      protected AdaptedSemaphoreNamedLock createLock( final String name )
      {
          ISemaphore semaphore = semaphores.computeIfAbsent( name, k ->
          {
              ISemaphore result = semaphoreFunction.apply( hazelcastInstance, k );
              result.init( Integer.MAX_VALUE );
              return result;
          } );
          return new AdaptedSemaphoreNamedLock( name, this, new HazelcastSemaphore( semaphore ) );
      }
  
      @Override
      public void shutdown()
      {
          if ( manageHazelcast )
          {
              hazelcastInstance.shutdown();
          }
      }
  
      @Override
      protected void destroyLock( final String name )
      {
          ISemaphore semaphore = semaphores.remove( name );
          if ( destroySemaphore )
          {
              if ( semaphore == null )
              {
                  throw new IllegalStateException( "Semaphore expected but does not exist: " + name );
              }
              semaphore.destroy();
          }
      }
 
     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 );
         }
     }
 }