com.facebook.buck.util

Class CloseableWrapper<T>

java.lang.Object

com.facebook.buck.util.AbstractCloseableWrapper<T,RuntimeException>

com.facebook.buck.util.CloseableWrapper<T>

All Implemented Interfaces:

AutoCloseable

public class CloseableWrapper<T>
extends AbstractCloseableWrapper<T,RuntimeException>

Convenience wrapper class to attach closeable functionality to non-closeable class so it can be used with try-with-resources to make sure resources are always released and proper exception suppression is used. The closer may not throw an exception.

Example:

 class Main {
  private static void finalizeMyClass(MyClass obj) {
    obj.shutdown();
  }

  public static void main() {
    try (CloseableWrapper<MyClass> myClassWrapper =
          CloseableWrapper.of(new MyClass(), Main::finalizeMyClass)) {
      myClassWrapper.get().doSomething();
    }
  }
 }

 

Method Summary

Modifier and Type	Method and Description
static <T> CloseableWrapper<T>	of(T obj, java.util.function.Consumer<T> closer) Wrap an object with AutoCloseable interface and provide a function to replace a close method.

Methods inherited from class com.facebook.buck.util.AbstractCloseableWrapper

close, get

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

of

public static <T> CloseableWrapper<T> of(T obj,
                                         java.util.function.Consumer<T> closer)

Wrap an object with AutoCloseable interface and provide a function to replace a close method. The wrapper is idempotent, i.e. it will call closer function exactly once, even if user calls close multiple times.

Parameters:

obj - Any class that does not implement AutoCloseable interface which is hard to extend

closer - A function to call on close