Class: RStyx::Server::InMemoryFile

Inherits:
SFile
  • Object
show all
Defined in:
lib/rstyx/server.rb

Overview

An SFile whose underlying data are stored as a String in memory. This string may grow to arbitrary size.

Instance Attribute Summary collapse

Attributes inherited from SFile

#atime, #gid, #mtime, #muid, #name, #parent, #permissions, #uid, #version

Instance Method Summary collapse

Methods inherited from SFile

#add_changelistener, #add_client, #appendonly?, #auth?, #can_setlength?, #can_setmode?, #can_setmtime?, #can_setname?, #client, #client_connected, #client_disconnected, #contents_changed, #delete, #directory?, #exclusive?, #filetype, #full_path, #length, #length=, #mode, #mode=, #num_clients, #qid, #refresh, #remove, #remove_client, #remove_dead_clients, #rename, #reply_read, #reply_write, #set_mtime, #stat, #uuid, #version_incr

Constructor Details

#initialize(name, argv = { :permissions => 0666, :apponly => false, :excl => false, :uid => ENV["USER"], :gid => ENV["GROUP"] }) ⇒ InMemoryFile

Returns a new instance of InMemoryFile.



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# File 'lib/rstyx/server.rb', line 1831

def initialize(name, argv={ :permissions => 0666, :apponly => false,
                 :excl => false, :uid => ENV["USER"],
                 :gid => ENV["GROUP"] })
  super(name, argv)
  @contentslock = Mutex.new
end

Instance Attribute Details

#contents ⇒ Object

The contents of the file, as a string.



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# File 'lib/rstyx/server.rb', line 1829

def contents
  @contents
end

Instance Method Details

#read(client, offset, count) ⇒ Object

Read data from the file.

client

the SFileClient object representing the client reading from this file.

offset

the offset the client wants to read from

count

the number of bytes that the client wishes to read



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# File 'lib/rstyx/server.rb', line 1846

def read(client, offset, count)
  data = @contents[offset..(offset+count)]
  data ||= ""
  return(reply_read(data))
end

#write(client, offset, data, truncate) ⇒ Object

Writes data to this file. Raises a StyxException if the offset is past the end of the file.

client

the SFileClient object representing the client writing to this file

offset

the offset the client wants to write to

data

the data that the client wishes to write

truncate

true or false depending on whether the file is to be truncated.



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# File 'lib/rstyx/server.rb', line 1863

def write(client, offset, data, truncate)
  @contentslock.synchronize do
    # First write to the file
    if @contents.nil?
      @contents = ""
    end

    if offset > @contents.length
      raise StyxException.new("attempt to write past the end of the file")          end

    @contents[offset..(offset + data.length)] = data
    if (truncate)
      @contents = @contents[0..(offset+data.length)] = data
    end
    return(reply_write(data.length, client.session))
  end
end