memcached java client

memcached java client

1. http://www.whalin.com/memcached/ v2.0.1
2. http://code.google.com/p/spymemcached/ v2.2

a. 使用whalin版会导致File Descriptor leak,而使用spy版则不会，原因是whalin版没有使用selector管理socketchannel.

       Thread.sleep( 1000   *   30 );
        System.out.println( " begin " );

        Selector selector  =   null ;
        SocketChannel channel  =   null ;
         try  {
            String host  =   " 192.168.0.74 " ;
             int  port  =   11211 ;
             int  timeout  =   1000   *   60 ;

            selector  =  Selector.open();
            channel  =  SocketChannel.open();
            channel.configureBlocking( false );

            channel.connect( new  InetSocketAddress(host, port));
            channel.register(selector, channel.validOps());

             try  {
                selector.select();
            }  catch  (IOException e) {
                e.printStackTrace();
            }

            Iterator it  =  selector.selectedKeys().iterator();
             int  i  =   0 ;
             while  (it.hasNext()) {
                i ++ ;
                System.out.println(i);
                SelectionKey selKey  =  (SelectionKey) it.next();
                it.remove();

                 try  {
                    processSelectionKey(selKey);
                }  catch  (IOException e) {
                    e.printStackTrace();
                    selKey.cancel();
                }
            }

            System.out.println( " unclose " );
            Thread.sleep( 1000   *   30 );
        }  catch  (Exception e) {
            e.printStackTrace();
        }  finally  {
             if  (channel  !=   null   &&  channel.isOpen()) {
                 try  {
                    channel.close();
                }  catch  (Exception e) {
                    e.printStackTrace();
                }
            }
             if  (selector != null ) {
                selector.close();       //  not fd leak
            }
        }

        System.out.println( " end " );
        Thread.sleep( 1000   *   30   *   1 );

通过lsof -p pid | grep pipe可以观察是否有fd leak.

b. w版set 1000000 object 需要600s左右，s版只需150s左右