vertx-lang-scala-docs_2.12 3.5.4 API < Back
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# Packages

-  package root
  Definition Classes
    root
-  package io
  Definition Classes
    root
-  package vertx
  Definition Classes
    io
-  package scala
  Definition Classes
    vertx
-  package core
  Definition Classes
    scala
-  package file
  Definition Classes
    core
- AsyncFile
- CopyOptions
- FileProps
- FileSystem
- FileSystemProps
- OpenOptions

c

io.vertx.scala.core.file

# FileSystem 

###
Companion object FileSystem

#### class FileSystem extends AnyRef

Contains a broad set of operations for manipulating files on the file system.

A (potential) blocking and non blocking version of each operation is provided.

The non blocking versions take a handler which is called when the operation completes or an error occurs.

The blocking versions are named `xxxBlocking` and return the results, or throw exceptions directly. In many cases, depending on the operating system and file system some of the potentially blocking operations can return quickly, which is why we provide them, but it's highly recommended that you test how long they take to return in your particular application before using them on an event loop.

Please consult the documentation for more information on file system support.

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### Instance Constructors

1.  new FileSystem(_asJava: AnyRef)

### Value Members

1.  final def !=(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
2.  final def ##(): Int
   Definition Classes
     AnyRef → Any
3.  final def ==(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
4.  final def asInstanceOf[T0]: T0
   Definition Classes
     Any
5.  def asJava: AnyRef
6.  def chmod(path: String, perms: String, handler: Handler[AsyncResult[Unit]]): FileSystem

   Change the permissions on the file represented by `path` to `perms`, asynchronously.

   Change the permissions on the file represented by `path` to `perms`, asynchronously.

   The permission String takes the form rwxr-x--- as specified here.

   path

     the path to the file

   perms

     the permissions string

   handler

     the handler that will be called on completion

   returns

     a reference to this, so the API can be used fluently

7.  def chmodBlocking(path: String, perms: String): FileSystem

   Blocking version of io.vertx.scala.core.file.FileSystem

8.  def chmodFuture(path: String, perms: String): scala.concurrent.Future[Unit]

   Like chmod but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

9.  def chmodRecursive(path: String, perms: String, dirPerms: String, handler: Handler[AsyncResult[Unit]]): FileSystem

   Change the permissions on the file represented by `path` to `perms`, asynchronously.

   Change the permissions on the file represented by `path` to `perms`, asynchronously. The permission String takes the form rwxr-x--- as specified in {here`.`

   If the file is directory then all contents will also have their permissions changed recursively. Any directory permissions will be set to `dirPerms`, whilst any normal file permissions will be set to `perms`.

   path

     the path to the file

   perms

     the permissions string

   dirPerms

     the directory permissions

   handler

     the handler that will be called on completion

   returns

     a reference to this, so the API can be used fluently

10.  def chmodRecursiveBlocking(path: String, perms: String, dirPerms: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#chmodRecursiveFuture

11.  def chmodRecursiveFuture(path: String, perms: String, dirPerms: String): scala.concurrent.Future[Unit]

    Like chmodRecursive but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

12.  def chown(path: String, user: Option[String], group: Option[String], handler: Handler[AsyncResult[Unit]]): FileSystem

    Change the ownership on the file represented by `path` to `user` and {code group`, asynchronously.`

    Change the ownership on the file represented by `path` to `user` and {code group`, asynchronously.`

    path

      the path to the file

    user

      the user name, `null` will not change the user name

    group

      the user group, `null` will not change the user group name

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

13.  def chownBlocking(path: String, user: Option[String], group: Option[String]): FileSystem

    Blocking version of

14.  def chownFuture(path: String, user: Option[String], group: Option[String]): scala.concurrent.Future[Unit]

    Like chown but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

15.  def clone(): AnyRef
    Attributes
      protected[java.lang]
    Definition Classes
      AnyRef
    Annotations
      @native() @throws( ... )
16.  def copy(from: String, to: String, options: CopyOptions, handler: Handler[AsyncResult[Unit]]): FileSystem

    Copy a file from the path `from` to path `to`, asynchronously.

    Copy a file from the path `from` to path `to`, asynchronously.

    from

      the path to copy from

    to

      the path to copy to

    options

      options describing how the file should be copiedsee CopyOptions

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

17.  def copy(from: String, to: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Copy a file from the path `from` to path `to`, asynchronously.

    Copy a file from the path `from` to path `to`, asynchronously.

    The copy will fail if the destination already exists.

    from

      the path to copy from

    to

      the path to copy to

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

18.  def copyBlocking(from: String, to: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#copyFuture

19.  def copyFuture(from: String, to: String, options: CopyOptions): scala.concurrent.Future[Unit]

    Like copy but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

20.  def copyFuture(from: String, to: String): scala.concurrent.Future[Unit]

    Like copy but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

21.  def copyRecursive(from: String, to: String, recursive: Boolean, handler: Handler[AsyncResult[Unit]]): FileSystem

    Copy a file from the path `from` to path `to`, asynchronously.

    Copy a file from the path `from` to path `to`, asynchronously.

    If `recursive` is `true` and `from` represents a directory, then the directory and its contents will be copied recursively to the destination `to`.

    The copy will fail if the destination if the destination already exists.

    from

      the path to copy from

    to

      the path to copy to

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

22.  def copyRecursiveBlocking(from: String, to: String, recursive: Boolean): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#copyRecursiveFuture

23.  def copyRecursiveFuture(from: String, to: String, recursive: Boolean): scala.concurrent.Future[Unit]

    Like copyRecursive but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

24.  def createFile(path: String, perms: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Creates an empty file with the specified `path` and permissions `perms`, asynchronously.

    Creates an empty file with the specified `path` and permissions `perms`, asynchronously.

    path

      path to the file

    perms

      the permissions string

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

25.  def createFile(path: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Creates an empty file with the specified `path`, asynchronously.

    Creates an empty file with the specified `path`, asynchronously.

    path

      path to the file

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

26.  def createFileBlocking(path: String, perms: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#createFileFuture

27.  def createFileBlocking(path: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#createFileFuture

28.  def createFileFuture(path: String, perms: String): scala.concurrent.Future[Unit]

    Like createFile but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

29.  def createFileFuture(path: String): scala.concurrent.Future[Unit]

    Like createFile but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

30.  def delete(path: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Deletes the file represented by the specified `path`, asynchronously.

    Deletes the file represented by the specified `path`, asynchronously.

    path

      path to the file

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

31.  def deleteBlocking(path: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#deleteFuture

32.  def deleteFuture(path: String): scala.concurrent.Future[Unit]

    Like delete but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

33.  def deleteRecursive(path: String, recursive: Boolean, handler: Handler[AsyncResult[Unit]]): FileSystem

    Deletes the file represented by the specified `path`, asynchronously.

    Deletes the file represented by the specified `path`, asynchronously.

    If the path represents a directory and `recursive = true` then the directory and its contents will be deleted recursively.

    path

      path to the file

    recursive

      delete recursively?

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

34.  def deleteRecursiveBlocking(path: String, recursive: Boolean): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#deleteRecursiveFuture

35.  def deleteRecursiveFuture(path: String, recursive: Boolean): scala.concurrent.Future[Unit]

    Like deleteRecursive but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

36.  final def eq(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
37.  def equals(arg0: Any): Boolean
    Definition Classes
      AnyRef → Any
38.  def exists(path: String, handler: Handler[AsyncResult[Boolean]]): FileSystem

    Determines whether the file as specified by the path `path` exists, asynchronously.

    Determines whether the file as specified by the path `path` exists, asynchronously.

    path

      path to the file

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

39.  def existsBlocking(path: String): Boolean

    Blocking version of io.vertx.scala.core.file.FileSystem#existsFuture

40.  def existsFuture(path: String): scala.concurrent.Future[Boolean]

    Like exists but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

41.  def finalize(): Unit
    Attributes
      protected[java.lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( classOf[java.lang.Throwable] )
42.  def fsProps(path: String, handler: Handler[AsyncResult[FileSystemProps]]): FileSystem

    Returns properties of the file-system being used by the specified `path`, asynchronously.

    Returns properties of the file-system being used by the specified `path`, asynchronously.

    path

      path to anywhere on the filesystem

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

43.  def fsPropsBlocking(path: String): FileSystemProps

    Blocking version of io.vertx.scala.core.file.FileSystem#fsPropsFuture

44.  def fsPropsFuture(path: String): scala.concurrent.Future[FileSystemProps]

    Like fsProps but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

45.  final def getClass(): Class[_]
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
46.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
47.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
48.  def link(link: String, existing: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Create a hard link on the file system from `link` to `existing`, asynchronously.

    Create a hard link on the file system from `link` to `existing`, asynchronously.

    link

      the link

    existing

      the link destination

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

49.  def linkBlocking(link: String, existing: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#linkFuture

50.  def linkFuture(link: String, existing: String): scala.concurrent.Future[Unit]

    Like link but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

51.  def lprops(path: String, handler: Handler[AsyncResult[FileProps]]): FileSystem

    Obtain properties for the link represented by `path`, asynchronously.

    Obtain properties for the link represented by `path`, asynchronously.

    The link will not be followed.

    path

      the path to the file

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

52.  def lpropsBlocking(path: String): FileProps

    Blocking version of io.vertx.scala.core.file.FileSystem#lpropsFuture

53.  def lpropsFuture(path: String): scala.concurrent.Future[FileProps]

    Like lprops but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

54.  def mkdir(path: String, perms: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Create the directory represented by `path`, asynchronously.

    Create the directory represented by `path`, asynchronously.

    The new directory will be created with permissions as specified by `perms`.

    The permission String takes the form rwxr-x--- as specified in here.

    The operation will fail if the directory already exists.

    path

      path to the file

    perms

      the permissions string

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

55.  def mkdir(path: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Create the directory represented by `path`, asynchronously.

    Create the directory represented by `path`, asynchronously.

    The operation will fail if the directory already exists.

    path

      path to the file

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

56.  def mkdirBlocking(path: String, perms: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#mkdirFuture

57.  def mkdirBlocking(path: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#mkdirFuture

58.  def mkdirFuture(path: String, perms: String): scala.concurrent.Future[Unit]

    Like mkdir but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

59.  def mkdirFuture(path: String): scala.concurrent.Future[Unit]

    Like mkdir but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

60.  def mkdirs(path: String, perms: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Create the directory represented by `path` and any non existent parents, asynchronously.

    Create the directory represented by `path` and any non existent parents, asynchronously.

    The new directory will be created with permissions as specified by `perms`.

    The permission String takes the form rwxr-x--- as specified in here.

    The operation will fail if the directory already exists.

    path

      path to the file

    perms

      the permissions string

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

61.  def mkdirs(path: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Create the directory represented by `path` and any non existent parents, asynchronously.

    Create the directory represented by `path` and any non existent parents, asynchronously.

    The operation will fail if the directory already exists.

    path

      path to the file

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

62.  def mkdirsBlocking(path: String, perms: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#mkdirsFuture

63.  def mkdirsBlocking(path: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#mkdirsFuture

64.  def mkdirsFuture(path: String, perms: String): scala.concurrent.Future[Unit]

    Like mkdirs but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

65.  def mkdirsFuture(path: String): scala.concurrent.Future[Unit]

    Like mkdirs but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

66.  def move(from: String, to: String, options: CopyOptions, handler: Handler[AsyncResult[Unit]]): FileSystem

    Move a file from the path `from` to path `to`, asynchronously.

    Move a file from the path `from` to path `to`, asynchronously.

    from

      the path to copy from

    to

      the path to copy to

    options

      options describing how the file should be copiedsee CopyOptions

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

67.  def move(from: String, to: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Move a file from the path `from` to path `to`, asynchronously.

    Move a file from the path `from` to path `to`, asynchronously.

    The move will fail if the destination already exists.

    from

      the path to copy from

    to

      the path to copy to

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

68.  def moveBlocking(from: String, to: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#moveFuture

69.  def moveFuture(from: String, to: String, options: CopyOptions): scala.concurrent.Future[Unit]

    Like move but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

70.  def moveFuture(from: String, to: String): scala.concurrent.Future[Unit]

    Like move but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

71.  final def ne(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
72.  final def notify(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
73.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
74.  def open(path: String, options: OpenOptions, handler: Handler[AsyncResult[AsyncFile]]): FileSystem

    Open the file represented by `path`, asynchronously.

    Open the file represented by `path`, asynchronously.

    The file is opened for both reading and writing. If the file does not already exist it will be created.

    path

      path to the file

    options

      options describing how the file should be openedsee OpenOptions

    returns

      a reference to this, so the API can be used fluently

75.  def openBlocking(path: String, options: OpenOptions): AsyncFile

    Blocking version of io.vertx.scala.core.file.FileSystem#openFuture

76.  def openFuture(path: String, options: OpenOptions): scala.concurrent.Future[AsyncFile]

    Like open but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

77.  def props(path: String, handler: Handler[AsyncResult[FileProps]]): FileSystem

    Obtain properties for the file represented by `path`, asynchronously.

    Obtain properties for the file represented by `path`, asynchronously.

    If the file is a link, the link will be followed.

    path

      the path to the file

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

78.  def propsBlocking(path: String): FileProps

    Blocking version of io.vertx.scala.core.file.FileSystem#propsFuture

79.  def propsFuture(path: String): scala.concurrent.Future[FileProps]

    Like props but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

80.  def readDir(path: String, filter: String, handler: Handler[AsyncResult[Buffer[String]]]): FileSystem

    Read the contents of the directory specified by `path`, asynchronously.

    Read the contents of the directory specified by `path`, asynchronously.

    The parameter `filter` is a regular expression. If `filter` is specified then only the paths that match @{filter`will be returned.`

    The result is an array of String representing the paths of the files inside the directory.

    path

      path to the directory

    filter

      the filter expression

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

81.  def readDir(path: String, handler: Handler[AsyncResult[Buffer[String]]]): FileSystem

    Read the contents of the directory specified by `path`, asynchronously.

    Read the contents of the directory specified by `path`, asynchronously.

    The result is an array of String representing the paths of the files inside the directory.

    path

      path to the file

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

82.  def readDirBlocking(path: String, filter: String): Buffer[String]

    Blocking version of io.vertx.scala.core.file.FileSystem#readDirFuture

83.  def readDirBlocking(path: String): Buffer[String]

    Blocking version of io.vertx.scala.core.file.FileSystem#readDirFuture

84.  def readDirFuture(path: String, filter: String): scala.concurrent.Future[Buffer[String]]

    Like readDir but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

85.  def readDirFuture(path: String): scala.concurrent.Future[Buffer[String]]

    Like readDir but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

86.  def readFile(path: String, handler: Handler[AsyncResult[Buffer]]): FileSystem

    Reads the entire file as represented by the path `path` as a , asynchronously.

    Reads the entire file as represented by the path `path` as a , asynchronously.

    Do not use this method to read very large files or you risk running out of available RAM.

    path

      path to the file

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

87.  def readFileBlocking(path: String): Buffer

    Blocking version of io.vertx.scala.core.file.FileSystem#readFileFuture

88.  def readFileFuture(path: String): scala.concurrent.Future[Buffer]

    Like readFile but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

89.  def readSymlink(link: String, handler: Handler[AsyncResult[String]]): FileSystem

    Returns the path representing the file that the symbolic link specified by `link` points to, asynchronously.

    Returns the path representing the file that the symbolic link specified by `link` points to, asynchronously.

    link

      the link

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

90.  def readSymlinkBlocking(link: String): String

    Blocking version of io.vertx.scala.core.file.FileSystem#readSymlinkFuture

91.  def readSymlinkFuture(link: String): scala.concurrent.Future[String]

    Like readSymlink but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

92.  def symlink(link: String, existing: String, handler: Handler[AsyncResult[Unit]]): FileSystem

    Create a symbolic link on the file system from `link` to `existing`, asynchronously.

    Create a symbolic link on the file system from `link` to `existing`, asynchronously.

    link

      the link

    existing

      the link destination

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

93.  def symlinkBlocking(link: String, existing: String): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#linkFuture

94.  def symlinkFuture(link: String, existing: String): scala.concurrent.Future[Unit]

    Like symlink but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

95.  final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
      AnyRef
96.  def toString(): String
    Definition Classes
      AnyRef → Any
97.  def truncate(path: String, len: Long, handler: Handler[AsyncResult[Unit]]): FileSystem

    Truncate the file represented by `path` to length `len` in bytes, asynchronously.

    Truncate the file represented by `path` to length `len` in bytes, asynchronously.

    The operation will fail if the file does not exist or `len` is less than `zero`.

    path

      the path to the file

    len

      the length to truncate it to

    handler

      the handler that will be called on completion

    returns

      a reference to this, so the API can be used fluently

98.  def truncateBlocking(path: String, len: Long): FileSystem

    Blocking version of io.vertx.scala.core.file.FileSystem#truncateFuture

99.  def truncateFuture(path: String, len: Long): scala.concurrent.Future[Unit]

    Like truncate but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

100.  def unlink(link: String, handler: Handler[AsyncResult[Unit]]): FileSystem

     Unlinks the link on the file system represented by the path `link`, asynchronously.

     Unlinks the link on the file system represented by the path `link`, asynchronously.

     link

       the link

     handler

       the handler that will be called on completion

     returns

       a reference to this, so the API can be used fluently

101.  def unlinkBlocking(link: String): FileSystem

     Blocking version of io.vertx.scala.core.file.FileSystem#unlinkFuture

102.  def unlinkFuture(link: String): scala.concurrent.Future[Unit]

     Like unlink but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

103.  final def wait(): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws( ... )
104.  final def wait(arg0: Long, arg1: Int): Unit
     Definition Classes
       AnyRef
     Annotations
       @throws( ... )
105.  final def wait(arg0: Long): Unit
     Definition Classes
       AnyRef
     Annotations
       @native() @throws( ... )
106.  def writeFile(path: String, data: Buffer, handler: Handler[AsyncResult[Unit]]): FileSystem

     Creates the file, and writes the specified `Buffer data` to the file represented by the path `path`, asynchronously.

     Creates the file, and writes the specified `Buffer data` to the file represented by the path `path`, asynchronously.

     path

       path to the file

     handler

       the handler that will be called on completion

     returns

       a reference to this, so the API can be used fluently

107.  def writeFileBlocking(path: String, data: Buffer): FileSystem

     Blocking version of io.vertx.scala.core.file.FileSystem#writeFileFuture

108.  def writeFileFuture(path: String, data: Buffer): scala.concurrent.Future[Unit]

     Like writeFile but returns a scala.concurrent.Future instead of taking an AsyncResultHandler.

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