Author: toad
Date: 2008-05-30 18:18:41 +0000 (Fri, 30 May 2008)
New Revision: 20147
Modified:
branches/db4o/freenet/src/freenet/node/RequestStarter.java
Log:
comments
Modified: branches/db4o/freenet/src/freenet/node/RequestStarter.java
===================================================================
--- branches/db4o/freenet/src/freenet/node/RequestStarter.java 2008-05-30
18:14:15 UTC (rev 20146)
+++ branches/db4o/freenet/src/freenet/node/RequestStarter.java 2008-05-30
18:18:41 UTC (rev 20147)
@@ -178,7 +178,17 @@
cycleTime = sentRequestTime =
System.currentTimeMillis();
}
}
-
+
+ /**
+ * Pull a request from the from-the-database-thread queue. Then ask for
a higher priority non-persistent request.
+ * If there isn't one, use the one we just pulled; if there is one, put
it back on the queue.
+ *
+ * Obviously, there will be a slightly higher latency for the database
queue; for example, when adding a new
+ * higher priority persistent request, we have a queue-length penalty
before starting to request it. We also
+ * have a significant penalty from all the database access (even if the
request itself is cached, the database
+ * thread is probably doing other things so we have to wait for that to
finish).
+ * @return
+ */
private SendableRequest getRequest() {
SendableRequest req;
while(true) {
