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Fixed stupid deadlock on auto reimportation

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Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>
This commit is contained in:
Louis Vallat 2020-11-27 13:41:40 +01:00
parent 9aef9ac706
commit 8987fbb6aa
3 changed files with 25 additions and 21 deletions
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1
app/src/main/java/xyz/vallat/louis/App.java
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@ -5,6 +5,7 @@ import org.slf4j.LoggerFactory;
import xyz.vallat.louis.managers.database.DBManager;
import xyz.vallat.louis.managers.discord.DiscordManager;
import xyz.vallat.louis.timer.TimerManager;
import xyz.vallat.louis.timer.tasks.AutoReimport;
public class App {

31
app/src/main/java/xyz/vallat/louis/managers/database/EventManager.java
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@ -24,62 +24,65 @@ public final class EventManager {
public static int reimportAllEvents() {
int importedEvents;
TimerManager.stopAllTimersForStudents();
try (Connection connection = DBManager.getConnection()) {
connection.setAutoCommit(false);
flushEvents(connection);
Map<Student, List<VEvent>> studentEvents = new HashMap<>();
StudentManager.getStudentsFromDatabase()
.forEach(s -> studentEvents.put(s, CalendarManager.getEventsFromResource(s.getAde())));
importedEvents = importEvents(studentEvents);
importedEvents = importEvents(studentEvents, connection);
if (importedEvents == 0) {
logger.error("No events were re-imported. Rolling back.");
connection.rollback();
} else {
logger.debug("'{}' events reimported, commiting.", importedEvents);
try {
logger.debug("'{}' events reimported, commiting.", importedEvents);
connection.commit();
} catch (SQLException e) {
logger.error("An SQLExcetpion occured, rolling back.", e);
connection.rollback();
}
}
TimerManager.stopAllTimersForStudents();
TimerManager.startAllTimersForStudents();
} catch (SQLException e) {
logger.error("SQLError while reimporting all events:", e);
return 0;
}
TimerManager.startAllTimersForStudents();
return importedEvents;
}
private static void flushEvents(Connection connection) throws SQLException {
logger.debug("Flushing all events in database.");
String sql = "TRUNCATE events RESTART IDENTITY;";
try (Statement stmt = connection.createStatement()) {
stmt.executeUpdate(sql);
}
}
public static int importEvents(Map<Student, List<VEvent>> events) {
public static int importEvents(Map<Student, List<VEvent>> events, Connection connection) throws SQLException {
int importedEvents = 0;
try (Connection connection = DBManager.getConnection()) {
connection.setAutoCommit(false);
for (Map.Entry<Student, List<VEvent>> e : events.entrySet()) {
if (e.getValue().isEmpty()) continue;
logger.debug("Importing {} events for student '{}' in database.", e.getValue().size(), e.getKey().getAde());
if (e.getValue().isEmpty()) {
logger.warn("Student '{}' has no event, apparently.", e.getKey().getAde());
continue;
}
if (e.getKey().getId() == 0) e.getKey().setId(StudentManager
.addStudent(e.getKey().getSnowflake(), e.getKey().getAde(), connection));
for (VEvent event : e.getValue())
if (importEvent(e.getKey(), event, connection) != 0) importedEvents++;
}
try {
connection.commit();
} catch (SQLException e) {
connection.rollback();
return 0;
return importedEvents;
}
public static int importEvents(Map<Student, List<VEvent>> events) {
try (Connection connection = DBManager.getConnection()) {
return importEvents(events, connection);
} catch (SQLException e) {
logger.error("SQLError while importing events.", e);
return 0;
}
return importedEvents;
}
public static List<Event> getNextEventsFromStudent(Student s) {

2
app/src/main/java/xyz/vallat/louis/timer/TimerManager.java
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@ -31,7 +31,7 @@ public final class TimerManager {
public static void startAutoReimportTimer() {
logger.debug("Setting up auto reimport timer.");
Calendar midday = Calendar.getInstance();
midday.set(Calendar.HOUR, 12);
midday.set(Calendar.HOUR, 1);
midday.set(Calendar.MINUTE, 30);
midday.set(Calendar.SECOND, 0);