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# Class: Vertx::AsyncFile

Inherits:
  Object
  - Object
  - Vertx::AsyncFile
  show all
Includes:
  ReadStream, WriteStream
Defined in:
  /Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb

## Overview

Represents a file on the file-system which can be read from, or written to asynchronously.

This class also implements ReadStream and WriteStream. This allows the data to be pumped to and from other streams, e.g. an HttpClientRequest instance, using the Pump class

## Instance Method Summary (collapse)

- - (void) close { ... }
  Close the file.
- - (self) drain_handler { ... }
- - (void) end(t = nil)
  Same as #end but writes some data to the stream before ending.
- - (self) end_handler { ... }
- - (self) exception_handler { ... }
- - (self) flush { ... }
  Same as #flush but the handler will be called when the flush is complete or if an error occurs.
- - (self) handler { ... }
- - (self) pause
- - (self) read(buffer = nil, offset = nil, position = nil, length = nil) { ... }
  Reads length bytes of data from the file at position position in the file, asynchronously.
- - (self) resume
- - (self) set_read_buffer_size(readBufferSize = nil)
  Sets the buffer size that will be used to read the data from the file.
- - (self) set_read_pos(readPos = nil)
  Sets the position from which data will be read from when using the file as a ReadStream.
- - (self) set_write_pos(writePos = nil)
  Sets the position from which data will be written when using the file as a WriteStream.
- - (self) set_write_queue_max_size(maxSize = nil)
- - (self) write(buffer = nil, position = nil) { ... }
  Write a Buffer to the file at position position in the file, asynchronously.
- - (true, false) write_queue_full?
  This will return true if there are more bytes in the write queue than the value set using #set_write_queue_max_size.

## Instance Method Details

### - (`void`) close { ... }

This method returns an undefined value.

Close the file. The actual close happens asynchronously. The handler will be called when the close is complete, or an error occurs.

Yields:

- the handler

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 133

    def close
      if !block_given?
        return @j_del.java_method(:close, []).call()
      elsif block_given?
        return @j_del.java_method(:close, [Java::IoVertxCore::Handler.java_class]).call((Proc.new { |ar| yield(ar.failed ? ar.cause : nil) }))
      end
      raise ArgumentError, "Invalid arguments when calling close()"
    end

### - (`self`) drain_handler { ... }

Yields:

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 113

    def drain_handler
      if block_given?
        @j_del.java_method(:drainHandler, [Java::IoVertxCore::Handler.java_class]).call(Proc.new { yield })
        return self
      end
      raise ArgumentError, "Invalid arguments when calling drain_handler()"
    end

### - (`void`) end(t = nil)

This method returns an undefined value.

Same as #end but writes some data to the stream before ending.

Parameters:

- t (`::Vertx::Buffer`) (defaults to: `nil`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 29

    def end(t=nil)
      if !block_given? && t == nil
        return @j_del.java_method(:end, []).call()
      elsif t.class.method_defined?(:j_del) && !block_given?
        return @j_del.java_method(:end, [Java::IoVertxCoreBuffer::Buffer.java_class]).call(t.j_del)
      end
      raise ArgumentError, "Invalid arguments when calling end(t)"
    end

### - (`self`) end_handler { ... }

Yields:

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 72

    def end_handler
      if block_given?
        @j_del.java_method(:endHandler, [Java::IoVertxCore::Handler.java_class]).call(Proc.new { yield })
        return self
      end
      raise ArgumentError, "Invalid arguments when calling end_handler()"
    end

### - (`self`) exception_handler { ... }

Yields:

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 122

    def exception_handler
      if block_given?
        @j_del.java_method(:exceptionHandler, [Java::IoVertxCore::Handler.java_class]).call((Proc.new { |event| yield(::Vertx::Util::Utils.from_throwable(event)) }))
        return self
      end
      raise ArgumentError, "Invalid arguments when calling exception_handler()"
    end

### - (`self`) flush { ... }

Same as #flush but the handler will be called when the flush is complete or if an error occurs

Yields:

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 165

    def flush
      if !block_given?
        @j_del.java_method(:flush, []).call()
        return self
      elsif block_given?
        @j_del.java_method(:flush, [Java::IoVertxCore::Handler.java_class]).call((Proc.new { |ar| yield(ar.failed ? ar.cause : nil) }))
        return self
      end
      raise ArgumentError, "Invalid arguments when calling flush()"
    end

### - (`self`) handler { ... }

Yields:

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 47

    def handler
      if block_given?
        @j_del.java_method(:handler, [Java::IoVertxCore::Handler.java_class]).call((Proc.new { |event| yield(::Vertx::Util::Utils.safe_create(event,::Vertx::Buffer)) }))
        return self
      end
      raise ArgumentError, "Invalid arguments when calling handler()"
    end

### - (`self`) pause

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 55

    def pause
      if !block_given?
        @j_del.java_method(:pause, []).call()
        return self
      end
      raise ArgumentError, "Invalid arguments when calling pause()"
    end

### - (`self`) read(buffer = nil, offset = nil, position = nil, length = nil) { ... }

Reads `length` bytes of data from the file at position `position` in the file, asynchronously.

The read data will be written into the specified `Buffer buffer` at position `offset`.

If data is read past the end of the file then zero bytes will be read.

When multiple reads are invoked on the same file there are no guarantees as to order in which those reads actually occur.

The handler will be called when the close is complete, or if an error occurs.

Parameters:

- buffer (`::Vertx::Buffer`) (defaults to: `nil`) —
  the buffer to read into
- offset (`Fixnum`) (defaults to: `nil`) —
  the offset into the buffer where the data will be read
- position (`Fixnum`) (defaults to: `nil`) —
  the position in the file where to start reading
- length (`Fixnum`) (defaults to: `nil`) —
  the number of bytes to read

Yields:

- the handler to call when the write is complete

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 155

    def read(buffer=nil,offset=nil,position=nil,length=nil)
      if buffer.class.method_defined?(:j_del) && offset.class == Fixnum && position.class == Fixnum && length.class == Fixnum && block_given?
        @j_del.java_method(:read, [Java::IoVertxCoreBuffer::Buffer.java_class,Java::int.java_class,Java::long.java_class,Java::int.java_class,Java::IoVertxCore::Handler.java_class]).call(buffer.j_del,offset,position,length,(Proc.new { |ar| yield(ar.failed ? ar.cause : nil, ar.succeeded ? ::Vertx::Util::Utils.safe_create(ar.result,::Vertx::Buffer) : nil) }))
        return self
      end
      raise ArgumentError, "Invalid arguments when calling read(buffer,offset,position,length)"
    end

### - (`self`) resume

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 63

    def resume
      if !block_given?
        @j_del.java_method(:resume, []).call()
        return self
      end
      raise ArgumentError, "Invalid arguments when calling resume()"
    end

### - (`self`) set_read_buffer_size(readBufferSize = nil)

Sets the buffer size that will be used to read the data from the file. Changing this value will impact how much the data will be read at a time from the file system.

Parameters:

- readBufferSize (`Fixnum`) (defaults to: `nil`) —
  the buffer size

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 199

    def set_read_buffer_size(readBufferSize=nil)
      if readBufferSize.class == Fixnum && !block_given?
        @j_del.java_method(:setReadBufferSize, [Java::int.java_class]).call(readBufferSize)
        return self
      end
      raise ArgumentError, "Invalid arguments when calling set_read_buffer_size(readBufferSize)"
    end

### - (`self`) set_read_pos(readPos = nil)

Sets the position from which data will be read from when using the file as a ReadStream.

Parameters:

- readPos (`Fixnum`) (defaults to: `nil`) —
  the position in the file

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 178

    def set_read_pos(readPos=nil)
      if readPos.class == Fixnum && !block_given?
        @j_del.java_method(:setReadPos, [Java::long.java_class]).call(readPos)
        return self
      end
      raise ArgumentError, "Invalid arguments when calling set_read_pos(readPos)"
    end

### - (`self`) set_write_pos(writePos = nil)

Sets the position from which data will be written when using the file as a WriteStream.

Parameters:

- writePos (`Fixnum`) (defaults to: `nil`) —
  the position in the file

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 188

    def set_write_pos(writePos=nil)
      if writePos.class == Fixnum && !block_given?
        @j_del.java_method(:setWritePos, [Java::long.java_class]).call(writePos)
        return self
      end
      raise ArgumentError, "Invalid arguments when calling set_write_pos(writePos)"
    end

### - (`self`) set_write_queue_max_size(maxSize = nil)

Parameters:

- maxSize (`Fixnum`) (defaults to: `nil`)

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 104

    def set_write_queue_max_size(maxSize=nil)
      if maxSize.class == Fixnum && !block_given?
        @j_del.java_method(:setWriteQueueMaxSize, [Java::int.java_class]).call(maxSize)
        return self
      end
      raise ArgumentError, "Invalid arguments when calling set_write_queue_max_size(maxSize)"
    end

### - (`self`) write(buffer = nil, position = nil) { ... }

Write a Buffer to the file at position `position` in the file, asynchronously.

If `position` lies outside of the current size of the file, the file will be enlarged to encompass it.

When multiple writes are invoked on the same file there are no guarantees as to order in which those writes actually occur

The handler will be called when the write is complete, or if an error occurs.

Parameters:

- buffer (`::Vertx::Buffer`) (defaults to: `nil`) —
  the buffer to write
- position (`Fixnum`) (defaults to: `nil`) —
  the position in the file to write it at

Yields:

- the handler to call when the write is complete

Returns:

- (`self`)

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 92

    def write(buffer=nil,position=nil)
      if buffer.class.method_defined?(:j_del) && !block_given? && position == nil
        @j_del.java_method(:write, [Java::IoVertxCoreBuffer::Buffer.java_class]).call(buffer.j_del)
        return self
      elsif buffer.class.method_defined?(:j_del) && position.class == Fixnum && block_given?
        @j_del.java_method(:write, [Java::IoVertxCoreBuffer::Buffer.java_class,Java::long.java_class,Java::IoVertxCore::Handler.java_class]).call(buffer.j_del,position,(Proc.new { |ar| yield(ar.failed ? ar.cause : nil) }))
        return self
      end
      raise ArgumentError, "Invalid arguments when calling write(buffer,position)"
    end

### - (`true`, `false`) write_queue_full?

This will return `true` if there are more bytes in the write queue than the value set using #set_write_queue_max_size

Returns:

- (`true`, `false`) —
  true if write queue is full

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx/async_file.rb', line 39

    def write_queue_full?
      if !block_given?
        return @j_del.java_method(:writeQueueFull, []).call()
      end
      raise ArgumentError, "Invalid arguments when calling write_queue_full?()"
    end