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If no ow control is speci ed, both sides of the communication transmit at will, leaving no inherent protection against receive buffer overrun This may not be a problem, depending on the serial protocol employed by the end points of the data channel However, if one side of the channel transmits a continuous data stream, the receiver must be dedicated to the task of servicing the receive buffer or risk losing data This is potentially a problem for multitasking systems, especially those that are not driven by a real-time kernel XON/XOFF ow control works as follows When the receiver s (call it A) internal receive buffer begins to reach capacity, it transmits an XOFF (0x13) character back to the sender (call it B) requesting that it pause its transmission After the application has unloaded some or all of the data, A transmits an XON (0x11) character notifying B that it is ready to receive more data XON/XOFF ow control has the advantage of not requiring support for any hardware handshake lines Its main drawback is that the in-band signalling is somewhat awkward in that an

We ve used the code in Listing 1132 instead because it generalizes much more naturally to the full status feed needed in 12 To use the feed in the sample application, we add an @feed_items instance variable for the current user s (paginated) feed, as in Listing 1133, and then add a feed partial (Listing 1134) to the Home page (Listing 1136)

class PagesController < ApplicationController def home @title = "Home" if signed_in @micropost = Micropostnew @feed_items = current_userfeedpaginate(:page => params[:page]) end end end

3

<% unless @feed_itemsempty %> <table class="microposts" summary="User microposts"> <%= render :partial => 'shared/feed_item', :collection => @feed_items %> </table> <%= will_paginate @feed_items %> <% end %>

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Much of what we've been discussing in this book is strategies to allow you to query collections of XML instances using a SQL database Almost all of 6 is devoted to this topic There is another approach to getting information out of individual XML instances and collections of XML instances, using new querying standards that are either fresh out of development or still in development These new standards promise to bring new options to the developer who will be building the kinds of systems we've been discussing in this book

application can inadvertently stop the remote endpoint from transmitting by sending an XOFF character in a binary data stream Also, it inhibits an application s ability to receive the XON or XOFF control characters because they are absorbed by the serial driver4 If available, RTS/CTS (hardware) ow control is the best way to avoid buffer over ow In this scheme the endpoint (call it A) wishing to transmit asserts the request to send (RTS) signal If the other endpoint (call it B) has suf cient room in its buffer and is willing to receive data, it will assert the clear to send (CTS) signal At this point device A begins transmitting If B s receive buffer approaches capacity, it de-asserts CTS and A pauses its transmission Eventually the application will read the available serial data, and B s serial port driver will assert CTS, allowing A to resume data transmission The default ow control setting is no ow control This is appropriate because many devices have no support for hardware or software ow control However, if the device with which you are communicating supports ow control, this default should be overridden In fact, some devices may require the use of ow control The ow control mode is con gured by invoking the setFlowControlMode method on a SerialPort object The current ow control mode in use by the driver can be retrieved at any time using the getFlowControlMode method

Here we pass a :collection parameter with the feed items, which causes render to use the given partial ( feed_item in this case) to render each item in the collection (We have omitted the :partial parameter in previous renderings, writing, eg, render shared/micropost , but with a :collection parameter that syntax doesn t work) The feed item partial itself appears in Listing 1135; note the addition of a delete link to the feed item partial, following the example from Listing 1038

<tr> <td class="gravatar"> <%= link_to gravatar_for(feed_itemuser), feed_itemuser %> </td> <td class="micropost"> <span class="user"> <%= link_to feed_itemusername, feed_itemuser %> </span> <span class="content"><%= feed_itemcontent %></span> <span class="timestamp"> Posted <%= time_ago_in_words(feed_itemcreated_at) %> ago </span> </td> <% if current_user (feed_itemuser) %> <td>

public void setFlowControlMode(int flowcontrol) throws UnsupportedCommOperationException public int getFlowControlMode()

<%= link_to "delete", feed_item, :method => :delete, :confirm => "You sure ", :title => feed_itemcontent %> </td> <% end %> </tr>

The desired ow control setting is passed to setFlowControlMode encoded as an integer equal in value to any of the following constants The value can also be the bitwise-or of one input (_IN) mode constant and the matching output (_OUT) constant

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