Simple Scala pattern for “using/try-with-resources” (Automatic Resource Management)

Question

C# has using with the IDisposable interface. Java 7+ has identical functionality with try and the AutoCloseable interface

Answer 1

this one works for me really well:

  implicit class ManagedCloseable[C <: AutoCloseable](resource: C) {
    def apply[T](block: (C) => T): T = {
    try {
      block(resource)
    } finally {
      resource.close()
    }
  }

using it for example in this Apache Cassandra client code:

val metadata = Cluster.builder().addContactPoint("vader").withPort(1234).build() { cluster =>
  cluster.getMetadata
}

or even shorter:

val metadata = Cluster.builder().addContactPoint("sedev01").withPort(9999).build()(_.getMetadata)