added RAM caching of queries

calldatastore.php

@@ -5,25 +5,48 @@
 
 try
 {
+ $mem = new Memcached();
+ $mem->addServer("127.0.0.1", 11211);
+
  $projectId = 'triple-cab-162115';
  $datastore = new DatastoreClient([
  'projectId' => $projectId
  ]);
 
  echo 'Matches:<br/>';
+ $matches_string = "";
+
+ //Get the string typed in by user for autocompletion...
  $queryval = $_GET['searchtext'];
+
+ //If it is not blank...
  if ($queryval[0]) {
- $upperlimit = $queryval . json_decode('"\ufffd"');
- $query = $datastore->query()
- ->kind('SKU')
- ->filter('name', '>=', $queryval)
- ->filter('name', '<', $upperlimit)
- ->order('name');
- $result = $datastore->runQuery($query);
- foreach ($result as $SKU) {
- echo $SKU['name'];
- echo '<br/>';
+
+ //we first have to check our local cache if we have the results for this query...
+ $cache_hit = $mem->get($queryval);
+ if ($cache_hit) {
+
+ //yes! we have it it cache, no need to go back to datastore...
+ $matches_string = (string) $cache_hit;
+ } else {
+
+ //cache miss, let us go to datastore and fetch the result...
+ $upperlimit = $queryval . json_decode('"\ufffd"');
+ $query = $datastore->query()
+ ->kind('SKU')
+ ->filter('name', '>=', $queryval)
+ ->filter('name', '<', $upperlimit)
+ ->order('name');
+ $result = $datastore->runQuery($query);
+ foreach ($result as $SKU) {
+ $matches_string = $matches_string . $SKU['name'] . "<br/>";
+ }
+
+ //finally, let us insert this query result in our local cache so that next time,
+ //we do not have to make a round-trip to datastore - note that we are caching for 1 day
+ $mem->set($queryval, $matches_string, 86400);
  }
+ echo $matches_string;
  }
 } catch (Exception $e) {
  echo 'Caught exception: ', $e->getMessage(), "\n";