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The inner class SerialWriter is shown in Listing 39 SerialWriter s run method enters a loop that reads data available on the socket s InputStream and immediately writes the data to the serial port s OutputStream It also maintains a single 1024-byte buffer that is (re)used for moving data from the socket to the serial port SerialWriter s job is just a bit less complicated than that of SerialReader as it doesn t need to be concerned with receive time-outs and thresholds A time-out could be set for reads from the socket s InputStream, but in this example, it simply blocks until 1 or more bytes of data are available and returns the minimum of the data available and the buffer length If the remote server closes the network connection, the socket s InputStream read method returns 1 When this occurs, running is set to false and the maintenance thread is interrupted This will cause

to count the microposts Since we will be including the stats on both the user show pages and the home page, the first line of Listing 1221 picks the right one using

A Serial Ethernet Converter all three threads to eventually fall out of their will terminate Listing 39 SerialWriter

As discussed in Box 94, this does nothing when @user is not nil (as on a profile page), but when it is (as on the Home page) it sets @user to the current user One final detail worth noting is the presence of CSS ids on some elements, as in

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This is for the benefit of the Ajax implementation in Section 1225, which accesses elements on the page using their unique ids With the partial in hand, including the stats on the Home page is easy, as shown in Listing 1222 (This also gets the test in Listing 1220 to pass) The result appears in Figure 1211

You can directly issue SQL queries in the query string of a URL The URL must point to the virtual directory that points to SQL Server discussed earlier You must specify the FOR XML clause in the query if you want the results to be returned as XML

private class SerialWriter implements Runnable { private byte[] ethBuf = new byte[1024]; private Thread maint; private SerialWriter(Thread maint) { thismaint = maint; } public void run() { int count = 0; while (running) { try { // Read all available data from network server count = sinread(ethBuf, 0, ethBuflength); if (count > 0) { // Write data received from network out serial port spoutwrite(ethBuf, 0, count); networkTotal += count; } else if (count == -1) { running = false; maintinterrupt(); } } catch (IOException ioe) { Systemoutprintln(ioegetMessage()); ioeprintStackTrace(); running = false; maintinterrupt(); break; } } } }

<% if signed_in %> <%= render 'shared/user_info' %> <%= render 'shared/stats' %> </td> </tr> </table> <% else %> <% end %>

For this application we wanted to move relatively large amounts of data between the serial port and the network If we only moved a byte (or even a few bytes) at a time, the CPU would be consumed, performing relatively heavyweight context switches moving back and forth from Java to the native OS This would dramatically reduce the overall throughput For this reason, a large receive threshold and buffer size were chosen for serial input Moving large buffers prorates the overhead of the expensive context switches mentioned previously Another way to possibly increase the overall throughput is to provide a large buffer for the driver s receive buffer, using the setInputBufferSize method described in Section 323 If the driver maintains a large receive buffer, it gives the application more time to service the buffer before the driver must tell the attached serial device to stop

We ll render the stats partial on the profile page in a moment, but first let s make a partial for the follow/unfollow button, as shown in Listing 1223

<% unless current_user (@user) %> <div id="follow_form"> <% if current_userfollowing (@user) %> <%= render 'unfollow' %> <% else %> <%= render 'follow' %> <% end %> </div> <% end %>

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