From 6bb99669eb0606c56ee195473006e219cedb9e81 Mon Sep 17 00:00:00 2001
From: Tomeu Vizoso <tomeu@tomeuvizoso.net>
Date: Wed, 31 Oct 2007 11:11:18 +0000
Subject: #4182: Flush every 20 changes or 1 minute after the last unflushed change.

---
diff --git a/NEWS b/NEWS
index 756bf1e..a519018 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,4 @@
+* #4182: Flush every 20 changes or 1 minute after the last unflushed change. (tomeu)
 * #4083: Remove the active loop and check usb sticks on idle. (tomeu)
 
 Snapshot 5051fc3a4b
diff --git a/src/olpc/datastore/xapianindex.py b/src/olpc/datastore/xapianindex.py
index 82e8644..06041aa 100644
--- a/src/olpc/datastore/xapianindex.py
+++ b/src/olpc/datastore/xapianindex.py
@@ -25,6 +25,7 @@ import warnings
 
 import secore
 import xapian as _xapian # we need to modify the QueryParser
+import gobject
 
 from olpc.datastore import model 
 from olpc.datastore.converter import converter
@@ -40,7 +41,10 @@ UPDATE = 2
 DELETE = 3
 
 # Force a flush every _n_ changes to the db
-THRESHOLD = 128
+FLUSH_THRESHOLD = 20
+
+# Force a flush after _n_ seconds since the last change to the db
+FLUSH_TIMEOUT = 60
 
 class ReadWriteConnection(secore.indexerconnection.IndexerConnection,
                           secore.searchconnection.SearchConnection):
@@ -81,11 +85,14 @@ class IndexManager(object):
         
         self.fields = set()
         self._write_lock = threading.Lock()
+
         self.deltact = 0 # delta count
-        
+        self._flush_timeout = None
+
     #
     # Initialization
     def connect(self, repo, **kwargs):
+        logging.debug('IndexManager.connect()')
         if self.write_index is not None:
             warnings.warn('''Requested redundant connect to index''',
                           RuntimeWarning)
@@ -114,6 +121,7 @@ class IndexManager(object):
 
     
     def stop(self, force=False):
+        logging.debug('IndexManager.stop()')
         self.flush(force=True)
         self.stopIndexer(force)
         self.write_index.close()
@@ -141,15 +149,28 @@ class IndexManager(object):
         # should terminate after the current task
         self.indexer.join()
 
+    def _flush_timeout_cb(self):
+        self.flush(True)
+        return False
+
     # flow control
     def flush(self, force=False):
+        logging.debug('IndexManager.flush: %r %r' % (force, self.deltact))
         """Called after any database mutation"""
+
+        if self._flush_timeout is not None:
+            gobject.source_remove(self._flush_timeout)
+            self._flush_timeout = None
+
         self.deltact += 1
-        if force or self.deltact > THRESHOLD:
+        if force or self.deltact > FLUSH_THRESHOLD:
             with self._write_lock:
                 self.write_index.flush()
                 #self.read_index.reopen()
                 self.deltact = 0
+        else:
+            self._flush_timeout = gobject.timeout_add(FLUSH_TIMEOUT * 1000,
+                                                      self._flush_timeout_cb)
 
     def enque(self, uid, vid, doc, operation, filestuff=None):
         # here we implement the sync/async policy
--
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