code: package io.ray.runtime.functionmanager;
  
  import com.google.common.base.Objects;
  import io.ray.runtime.generated.Common.Language;
  import java.util.Arrays;
  import java.util.List;
  
  /** Represents metadata of a Python function. */
  public class PyFunctionDescriptor implements FunctionDescriptor {
  
    public String moduleName;
  
    public String className;
  
    public String functionName;
  
    public PyFunctionDescriptor(String moduleName, String className, String functionName) {
      this.moduleName = moduleName;
      this.className = className;
      this.functionName = functionName;
    }
  
    @Override
    public String toString() {
      return moduleName + "." + className + "." + functionName;
    }
  
    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
      PyFunctionDescriptor that = (PyFunctionDescriptor) o;
      return Objects.equal(moduleName, that.moduleName)
          && Objects.equal(className, that.className)
          && Objects.equal(functionName, that.functionName);
    }
  
    @Override
    public int hashCode() {
      return Objects.hashCode(moduleName, className, functionName);
    }
  
    @Override
    public List<String> toList() {
      return Arrays.asList(moduleName, className, functionName, "" /* function hash */);
    }
  
    @Override
    public Language getLanguage() {
      return Language.PYTHON;
    }
  }
  