http://lucene.apache.org/lucene-parent/lucene-core: Apache Lucene Java Core (The Apache Software Foundation) 
public interface org.apache.lucene.util.IOSupplier<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.apache.lucene.util.IOSupplier
  super_class: java.lang.Object
{
  public abstract T get();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException
    Signature: ()TT;
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "IOSupplier.java"
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()