content: /*
   * Copyright (C) 2013 Facebook, Inc.
   *
   * Licensed 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 io.airlift.drift.transport.netty.client;
  
  import com.google.common.annotations.VisibleForTesting;
  import com.google.inject.Binder;
  import com.google.inject.Inject;
  import com.google.inject.Injector;
  import com.google.inject.Key;
  import com.google.inject.Module;
  import com.google.inject.Provider;
  import com.google.inject.Scopes;
  import com.google.inject.TypeLiteral;
  import io.airlift.drift.transport.client.DriftClientConfig;
  import io.airlift.drift.transport.client.MethodInvokerFactory;
  import io.netty.buffer.ByteBufAllocator;
  import jakarta.annotation.PreDestroy;
  
  import java.lang.annotation.Annotation;
  
  import static com.google.common.base.Preconditions.checkState;
  import static io.airlift.configuration.ConfigBinder.configBinder;
  import static java.util.Objects.requireNonNull;
  
  public class DriftNettyClientModule
          implements Module
  {
      private final ByteBufAllocator allocator;
  
      public DriftNettyClientModule()
      {
          this(ByteBufAllocator.DEFAULT);
      }
  
      @VisibleForTesting
      public DriftNettyClientModule(ByteBufAllocator allocator)
      {
          this.allocator = requireNonNull(allocator, "allocator is null");
      }
  
      @Override
      public void configure(Binder binder)
      {
          configBinder(binder).bindConfig(DriftNettyConnectionFactoryConfig.class);
          configBinder(binder).bindConfigurationBindingListener((binding, configBinder) -> {
              if (binding.configClass().equals(DriftClientConfig.class)) {
                  configBinder.bindConfig(DriftNettyClientConfig.class, binding.key().getAnnotation(), binding.prefix().orElse(null));
              }
          });
  
          binder.bind(ByteBufAllocator.class).toInstance(allocator);
          binder.bind(new TypeLiteral<MethodInvokerFactory<Annotation>>() {})
                  .toProvider(MethodInvokerFactoryProvider.class)
                  .in(Scopes.SINGLETON);
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o) {
              return true;
          }
          return o != null && getClass() == o.getClass();
      }
  
      @Override
      public int hashCode()
      {
          return getClass().hashCode();
      }
  
      private static class MethodInvokerFactoryProvider
              implements Provider<MethodInvokerFactory<Annotation>>
      {
          private Injector injector;
          private DriftNettyMethodInvokerFactory<Annotation> factory;
  
          @Inject
          public void setInjector(Injector injector)
          {
              this.injector = injector;
          }
  
          @Override
          public MethodInvokerFactory<Annotation> get()
          {
              checkState(factory == null, "factory already created");
  
              factory = new DriftNettyMethodInvokerFactory<>(
                      injector.getInstance(DriftNettyConnectionFactoryConfig.class),
                      annotation -> injector.getInstance(Key.get(DriftNettyClientConfig.class, annotation)),
                      injector.getInstance(ByteBufAllocator.class));
  
              return factory;
          }
  
          @PreDestroy
          public void destroy()
          {
              factory.close();
          }
      }
  }
  