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package org.infinispan.configuration.global;

import java.lang.ref.WeakReference;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import org.infinispan.commons.configuration.Builder;
import org.infinispan.commons.configuration.BuiltBy;
import org.infinispan.commons.util.Util;
import org.infinispan.commons.CacheConfigurationException;
import static java.util.Arrays.asList;

public class GlobalConfigurationBuilder implements GlobalConfigurationChildBuilder {

   private WeakReference cl;
   private final TransportConfigurationBuilder transport;
   private final GlobalJmxStatisticsConfigurationBuilder globalJmxStatistics;
   private final SerializationConfigurationBuilder serialization;
   private final GlobalSecurityConfigurationBuilder security;
   private final ThreadPoolConfigurationBuilder evictionThreadPool;
   private final ThreadPoolConfigurationBuilder listenerThreadPool;
   private final ThreadPoolConfigurationBuilder replicationQueueThreadPool;
   private final ThreadPoolConfigurationBuilder persistenceThreadPool;
   private final ShutdownConfigurationBuilder shutdown;
   private final List> modules = new ArrayList>();
   private final SiteConfigurationBuilder site;

   public GlobalConfigurationBuilder() {
      // In OSGi contexts the TCCL should not be used. Use the infinispan-core bundle as default instead.
      ClassLoader defaultCL = Util.isOSGiContext() ? GlobalConfigurationBuilder.class.getClassLoader() : Thread.currentThread().getContextClassLoader();
      this.cl = new WeakReference(defaultCL);
      this.transport = new TransportConfigurationBuilder(this);
      this.globalJmxStatistics = new GlobalJmxStatisticsConfigurationBuilder(this);
      this.serialization = new SerializationConfigurationBuilder(this);
      this.security = new GlobalSecurityConfigurationBuilder(this);
      this.shutdown = new ShutdownConfigurationBuilder(this);
      this.site = new SiteConfigurationBuilder(this);
      this.evictionThreadPool = new ThreadPoolConfigurationBuilder(this);
      this.listenerThreadPool = new ThreadPoolConfigurationBuilder(this);
      this.replicationQueueThreadPool = new ThreadPoolConfigurationBuilder(this);
      this.persistenceThreadPool = new ThreadPoolConfigurationBuilder(this);
   }

   /**
    * Helper method that gets you a default constructed GlobalConfiguration, preconfigured to use the default clustering
    * stack.
    *
    * @return a new global configuration
    */
   public GlobalConfigurationBuilder clusteredDefault() {
      transport().
         defaultTransport()
         .clearProperties();
      return this;
   }

   /**
    * Helper method that gets you a default constructed GlobalConfiguration, preconfigured for use in LOCAL mode
    *
    * @return a new global configuration
    */
   public GlobalConfigurationBuilder nonClusteredDefault() {
      transport()
         .transport(null)
         .clearProperties();
      return this;
   }

   protected ClassLoader getClassLoader() {
      return cl.get();
   }

   public GlobalConfigurationBuilder classLoader(ClassLoader cl) {
      this.cl = new WeakReference(cl);
      return this;
   }

   @Override
   public TransportConfigurationBuilder transport() {
      return transport;
   }

   /**
    * This method allows configuration of the global, or cache manager level,
    * jmx statistics.
    */
   @Override
   public GlobalJmxStatisticsConfigurationBuilder globalJmxStatistics() {
      return globalJmxStatistics;
   }

   @Override
   public SerializationConfigurationBuilder serialization() {
      return serialization;
   }

   /**
    * @deprecated This method always returns null now.
    * Set thread pool via {@link TransportConfigurationBuilder#transportThreadPool()} instead.
    */
   @Deprecated
   @Override
   public ExecutorFactoryConfigurationBuilder asyncTransportExecutor() {
      return null;
   }

   /**
    * @deprecated This method always returns null now.
    * Set thread pool via {@link #listenerThreadPool()} instead.
    */
   @Deprecated
   @Override
   public ExecutorFactoryConfigurationBuilder asyncListenerExecutor() {
      return null;
   }

   /**
    * @deprecated This method always returns null now.
    * Set thread pool via {@link #persistenceThreadPool()} instead.
    */
   @Deprecated
   @Override
   public ExecutorFactoryConfigurationBuilder persistenceExecutor() {
      return null;
   }

   /**
    * @deprecated This method always returns null now.
    * Set thread pool via {@link TransportConfigurationBuilder#remoteCommandThreadPool()} instead.
    */
   @Deprecated
   @Override
   public ExecutorFactoryConfigurationBuilder remoteCommandsExecutor() {
      return null;
   }

   /**
    * @deprecated This method always returns null now.
    * Set thread pool via {@link #evictionThreadPool()} instead.
    */
   @Deprecated
   @Override
   public ScheduledExecutorFactoryConfigurationBuilder evictionScheduledExecutor() {
      return null;
   }

   /**
    * @deprecated This method always returns null now.
    * Set thread pool via {@link #replicationQueueThreadPool()} instead.
    */
   @Deprecated
   @Override
   public ScheduledExecutorFactoryConfigurationBuilder replicationQueueScheduledExecutor() {
      return null;
   }

   public ThreadPoolConfigurationBuilder evictionThreadPool() {
      return evictionThreadPool;
   }

   public ThreadPoolConfigurationBuilder listenerThreadPool() {
      return listenerThreadPool;
   }

   public ThreadPoolConfigurationBuilder replicationQueueThreadPool() {
      return replicationQueueThreadPool;
   }

   public ThreadPoolConfigurationBuilder persistenceThreadPool() {
      return persistenceThreadPool;
   }

   @Override
   public GlobalSecurityConfigurationBuilder security() {
      return security;
   }

   @Override
   public ShutdownConfigurationBuilder shutdown() {
      return shutdown;
   }

   public List> modules() {
      return modules;
   }

   public GlobalConfigurationBuilder clearModules() {
      modules.clear();
      return this;
   }

   @Override
   public SiteConfigurationBuilder site() {
      return site;
   }

   public > T addModule(Class klass) {
      try {
         Constructor constructor = klass.getDeclaredConstructor(GlobalConfigurationBuilder.class);
         T builder = constructor.newInstance(this);
         this.modules.add(builder);
         return builder;
      } catch (Exception e) {
         throw new CacheConfigurationException("Could not instantiate module configuration builder '" + klass.getName() + "'", e);
      }
   }

   /**
    * @deprecated This method always returns null now.
    * Set thread pool via {@link TransportConfigurationBuilder#totalOrderThreadPool()} instead.
    */
   @Deprecated
   public ExecutorFactoryConfigurationBuilder totalOrderExecutor() {
      return null;
   }

   @SuppressWarnings("unchecked")
   public void validate() {
      for (Builder validatable : asList(evictionThreadPool, listenerThreadPool,
            replicationQueueThreadPool, persistenceThreadPool,
            globalJmxStatistics, transport, security, serialization, shutdown, site)) {
         validatable.validate();
      }
      for (Builder m : modules) {
         m.validate();
      }
   }

   @Override
   public GlobalConfiguration build() {
      validate();
      List