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IO (Java NIO (Buffer (primitive type buffers, MappedByteBuffer, flip() -…

- - - - FileChannel
      - DatagramChannel
      - SockerChannel
      - ServerSockerChannel
    - - transferFrom(sourceChan, position, count)
      - transferTo(position, count, targetChan)
  - - - channel() - get channel associated with the selKey
      - selector() - get selector associated with the selKey
      - attach(obj) - attach an object to a selKey
      - attachment() - get the attached obj
    - - select() - blocks until a channel is ready for the events registered
      - select(timeout) - block upto timeout
      - selectNow() - return immediately with whatever channels ready
      - selectedKeys() - once the select methods return > 0, get a Set<SelectionKey> of ready selections
      - use iterator to iterate thru the selKeys. MUST remove each selKey by iterator.remove() after iterating it.
      - you need to cast the channel from SelectionKey.channel() to proper type
      - wakeUp() - resume a thread that is waiting on a select(). must be called from another thread
      - close() - close the selector, invalidates all selectionKeys registered. Channels are not closed
      - http://tutorials.jenkov.com/java-nio/selectors.html
  - - - reads data from a channel into multiple buffers
      - reads into buffers in order as they appear in the array
      - once a buffer is full, move on reading into next buffer
      - NOT for dynamic data length, need to know the fixed size beforehand
    - - writes data from multiple buffers into a single channel
      - writes in order as buffers in the array
      - only writes data in between position and limit
      - works fine with dynamic sized data
- - - - Order a BigMac and wait at counter until it's ready
    - - Order a BigMac and go back to seat, but has to get back to counter every 5 min to see if it's ready
    - - Order a BigMac and go back to seat, staff will notify you when it's ready, but you have to go to counter to pick it yourself
    - - Order a BigMac, get someone wait at counter for you and go back to seat. He'll call you when it's ready, but you have to go to counter to pick it yourself