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   /*
    * Copyright 2019 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.netty.util.internal;
  
  import io.netty.util.concurrent.FastThreadLocalThread;
  import reactor.blockhound.BlockHound;
  import reactor.blockhound.integration.BlockHoundIntegration;
  
  import java.util.function.Function;
  import java.util.function.Predicate;
  
  /**
   * Contains classes that must have public visibility but are not public API.
   */
  class Hidden {
  
      /**
       * This class integrates Netty with BlockHound.
       * <p>
       * It is public but only because of the ServiceLoader's limitations
       * and SHOULD NOT be considered a public API.
       */
      @UnstableApi
      @SuppressJava6Requirement(reason = "BlockHound is Java 8+, but this class is only loaded by it's SPI")
      public static final class NettyBlockHoundIntegration implements BlockHoundIntegration {
  
          @Override
          public void applyTo(BlockHound.Builder builder) {
              builder.allowBlockingCallsInside(
                      "io.netty.channel.nio.NioEventLoop",
                      "handleLoopException"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.channel.kqueue.KQueueEventLoop",
                      "handleLoopException"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.channel.epoll.EpollEventLoop",
                      "handleLoopException"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.util.HashedWheelTimer",
                      "start"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.util.HashedWheelTimer",
                      "stop"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.util.HashedWheelTimer$Worker",
                      "waitForNextTick"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.util.concurrent.SingleThreadEventExecutor",
                      "confirmShutdown"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.buffer.PoolArena",
                      "lock"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.buffer.PoolSubpage",
                      "lock"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.buffer.PoolChunk",
                      "allocateRun"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.buffer.PoolChunk",
                      "free"
              );
  
              builder.allowBlockingCallsInside(
                      "io.netty.handler.ssl.SslHandler",
                     "handshake"
             );
 
             builder.allowBlockingCallsInside(
                     "io.netty.handler.ssl.SslHandler",
                     "runAllDelegatedTasks"
             );
             builder.allowBlockingCallsInside(
                     "io.netty.handler.ssl.SslHandler",
                     "runDelegatedTasks"
             );
             builder.allowBlockingCallsInside(
                     "io.netty.util.concurrent.GlobalEventExecutor",
                     "takeTask");
 
             builder.allowBlockingCallsInside(
                     "io.netty.util.concurrent.GlobalEventExecutor",
                     "addTask");
 
             builder.allowBlockingCallsInside(
                     "io.netty.util.concurrent.SingleThreadEventExecutor",
                     "takeTask");
 
             builder.allowBlockingCallsInside(
                     "io.netty.util.concurrent.SingleThreadEventExecutor",
                     "addTask");
 
             builder.allowBlockingCallsInside(
                     "io.netty.handler.ssl.ReferenceCountedOpenSslClientContext$ExtendedTrustManagerVerifyCallback",
                     "verify");
 
             builder.allowBlockingCallsInside(
                     "io.netty.handler.ssl.JdkSslContext$Defaults",
                     "init");
 
             // Let's whitelist SSLEngineImpl.unwrap(...) for now as it may fail otherwise for TLS 1.3.
             // See https://mail.openjdk.java.net/pipermail/security-dev/2020-August/022271.html
             builder.allowBlockingCallsInside(
                     "sun.security.ssl.SSLEngineImpl",
                     "unwrap");
 
             builder.allowBlockingCallsInside(
                     "sun.security.ssl.SSLEngineImpl",
                     "wrap");
 
             builder.allowBlockingCallsInside(
                     "io.netty.resolver.dns.UnixResolverDnsServerAddressStreamProvider",
                     "parse");
 
             builder.allowBlockingCallsInside(
                     "io.netty.resolver.dns.UnixResolverDnsServerAddressStreamProvider",
                     "parseEtcResolverSearchDomains");
 
             builder.allowBlockingCallsInside(
                     "io.netty.resolver.dns.UnixResolverDnsServerAddressStreamProvider",
                     "parseEtcResolverOptions");
 
             builder.allowBlockingCallsInside(
                     "io.netty.resolver.HostsFileEntriesProvider$ParserImpl",
                     "parse");
 
             builder.allowBlockingCallsInside(
                     "io.netty.util.NetUtil$SoMaxConnAction",
                     "run");
 
             builder.allowBlockingCallsInside("io.netty.util.internal.ReferenceCountUpdater",
                     "retryRelease0");
 
             builder.allowBlockingCallsInside("io.netty.util.internal.PlatformDependent", "createTempFile");
             builder.nonBlockingThreadPredicate(new Function<Predicate<Thread>, Predicate<Thread>>() {
                 @Override
                 public Predicate<Thread> apply(final Predicate<Thread> p) {
                     return new Predicate<Thread>() {
                         @Override
                         @SuppressJava6Requirement(reason = "Predicate#test")
                         public boolean test(Thread thread) {
                             return p.test(thread) ||
                                     thread instanceof FastThreadLocalThread &&
                                             !((FastThreadLocalThread) thread).permitBlockingCalls();
                         }
                     };
                 }
             });
         }
 
         @Override
         public int compareTo(BlockHoundIntegration o) {
             return 0;
         }
     }
 }