/**
* Returns the cached recent messages history.
*
* @return
* @throws IOException
*/
private History getHistory() throws IOException {
synchronized (historyID) {
HistoryService historyService =
MessageHistoryActivator.getMessageHistoryService().getHistoryService();
if (history == null) {
history = historyService.createHistory(historyID, recordStructure);
// lets check the version if not our version, re-create
// history (delete it)
HistoryReader reader = history.getReader();
boolean delete = false;
QueryResultSet<HistoryRecord> res = reader.findLast(1);
if (res != null && res.hasNext()) {
HistoryRecord hr = res.next();
if (hr.getPropertyValues().length >= 4) {
if (!hr.getPropertyValues()[3].equals(RECENT_MSGS_VER)) delete = true;
} else delete = true;
}
if (delete) {
// delete it
try {
historyService.purgeLocallyStoredHistory(historyID);
history = historyService.createHistory(historyID, recordStructure);
} catch (IOException ex) {
logger.error("Cannot delete recent_messages history", ex);
}
}
}
return history;
}
}
public void testWriteRecordsWithMaxNumber() {
HistoryWriter writer = this.history.getWriter();
HistoryReader reader = this.history.getReader();
try {
for (int i = 0; i < 20; i++) {
writer.addRecord(new String[] {"" + i, "name" + i, i % 2 == 0 ? "m" : "f"}, 20);
synchronized (this) {
try {
wait(100);
} catch (Throwable t) {
}
}
}
QueryResultSet<HistoryRecord> recs = reader.findLast(20);
int count = 0;
while (recs.hasNext()) {
count++;
recs.next();
}
assertEquals("Wrong count of messages", 20, count);
writer.addRecord(new String[] {"" + 21, "name" + 21, "f"}, 20);
recs = reader.findLast(20);
count = 0;
boolean foundFirstMessage = false;
while (recs.hasNext()) {
count++;
HistoryRecord hr = recs.next();
if (hr.getPropertyValues()[0].equals("0")) foundFirstMessage = true;
}
assertEquals("Wrong count of messages", 20, count);
assertFalse("Wrong message removed, must be the first one", foundFirstMessage);
} catch (Exception e) {
e.printStackTrace();
fail("Could not write records. Reason: " + e);
}
}