NettyInternalLoggerFactorySubstitutions.java

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package com.google.api.gax.grpc.nativeimage.substitutions;

import com.oracle.svm.core.annotate.Substitute;
import com.oracle.svm.core.annotate.TargetClass;
import io.grpc.netty.shaded.io.netty.util.internal.logging.InternalLoggerFactory;
import io.grpc.netty.shaded.io.netty.util.internal.logging.JdkLoggerFactory;
import java.util.function.BooleanSupplier;

/**
 * Substitutions for {@link InternalLoggerFactory} which are needed to avoid dynamic loading of
 * logging library.
 */
@TargetClass(
    className = "io.grpc.netty.shaded.io.netty.util.internal.logging.InternalLoggerFactory",
    onlyWith = NettyInternalLoggerFactorySubstitutions.OnlyIfInClassPath.class)
final class NettyInternalLoggerFactorySubstitutions {

  private NettyInternalLoggerFactorySubstitutions() {}

  @Substitute
  private static InternalLoggerFactory newDefaultFactory(String name) {
    return JdkLoggerFactory.INSTANCE;
  }

  static class OnlyIfInClassPath implements BooleanSupplier {

    @Override
    public boolean getAsBoolean() {
      try {
        // Note: Set initialize = false to avoid initializing the class when looking it up.
        Class.forName(
            "io.grpc.netty.shaded.io.netty.util.internal.logging.InternalLoggerFactory",
            false,
            Thread.currentThread().getContextClassLoader());
        return true;
      } catch (ClassNotFoundException e) {
        return false;
      }
    }
  }
}