Retry logic

[danasilver]

Detect when a query fails and retry the search n times.

• How do we determine if a query fails?
• How many times should we retry by default?
• How long should we wait between tries?
• Should we report the number of tries?

[danasilver]

How do we determine if a query fails?

A search with no results has this block, which is absent in a failed query:

<table class="tblResults" cellspacing="0" rules="all" border="1" id="ctl00_ctl00_PageContent_PageContent_middDirectoryForm_lstResults" width="100%">
    <tr class="ResultHeader" align="center" bgcolor="White">
        <td><b><a href="javascript:__doPostBack('ctl00$ctl00$PageContent$PageContent$middDirectoryForm$lstResults$ctl01$ctl00','')">Name</a></b></td><td><b><a href="javascript:__doPostBack('ctl00$ctl00$PageContent$PageContent$middDirectoryForm$lstResults$ctl01$ctl01','')">E-mail</a></b></td><td><b><a href="javascript:__doPostBack('ctl00$ctl00$PageContent$PageContent$middDirectoryForm$lstResults$ctl01$ctl02','')">Phone</a></b></td><td><b><a href="javascript:__doPostBack('ctl00$ctl00$PageContent$PageContent$middDirectoryForm$lstResults$ctl01$ctl03','')">Type</a></b></td><td><b><a href="javascript:__doPostBack('ctl00$ctl00$PageContent$PageContent$middDirectoryForm$lstResults$ctl01$ctl04','')">Dept / Commons</a></b></td>
    </tr>
</table>

The failed query has no element with a tblResults class.