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Measure stability of each connection separately.

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This should reduce the impact of connections that fail at the remote
end.
This commit is contained in:
akwizgran
2020-06-05 11:11:43 +01:00
parent 9909d205c7
commit ef5b91da89
1 changed files with 29 additions and 14 deletions
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43
bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothConnectionLimiterImpl.java
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@@ -6,6 +6,7 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
import org.briarproject.bramble.api.sync.event.CloseSyncConnectionsEvent;
import org.briarproject.bramble.api.system.Clock;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Logger;
@@ -29,14 +30,11 @@ class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
private final Object lock = new Object();
@GuardedBy("lock")
private final List<DuplexTransportConnection> connections =
new LinkedList<>();
private final List<ConnectionRecord> connections = new LinkedList<>();
@GuardedBy("lock")
private boolean keyAgreementInProgress = false;
@GuardedBy("lock")
private int connectionLimit = 2;
@GuardedBy("lock")
private long timeOfLastChange = 0;
BluetoothConnectionLimiterImpl(EventBus eventBus, Clock clock) {
this.eventBus = eventBus;
@@ -84,8 +82,7 @@ class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
synchronized (lock) {
long now = clock.currentTimeMillis();
countStableConnections(now);
connections.add(conn);
timeOfLastChange = now;
connections.add(new ConnectionRecord(conn, now));
if (LOG.isLoggable(INFO)) {
LOG.info("Connection opened, " + connections.size() + " open");
}
@@ -96,11 +93,15 @@ class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
public void connectionClosed(DuplexTransportConnection conn,
boolean exception) {
synchronized (lock) {
long now = clock.currentTimeMillis();
if (exception) LOG.info("Connection failed");
countStableConnections(now);
connections.remove(conn);
timeOfLastChange = now;
countStableConnections(clock.currentTimeMillis());
Iterator<ConnectionRecord> it = connections.iterator();
while (it.hasNext()) {
if (it.next().conn == conn) {
it.remove();
break;
}
}
if (LOG.isLoggable(INFO)) {
LOG.info("Connection closed, " + connections.size() + " open");
}
@@ -113,19 +114,33 @@ class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
long now = clock.currentTimeMillis();
countStableConnections(now);
connections.clear();
timeOfLastChange = now;
LOG.info("All connections closed");
}
}
@GuardedBy("lock")
private void countStableConnections(long now) {
if (now - timeOfLastChange >= STABILITY_PERIOD_MS &&
connections.size() > connectionLimit) {
connectionLimit = connections.size();
int stable = 0;
for (ConnectionRecord rec : connections) {
if (now - rec.timeOpened >= STABILITY_PERIOD_MS) stable++;
}
if (stable > connectionLimit) {
connectionLimit = stable;
if (LOG.isLoggable(INFO)) {
LOG.info("Raising connection limit to " + connectionLimit);
}
}
}
private static class ConnectionRecord {
private final DuplexTransportConnection conn;
private final long timeOpened;
private ConnectionRecord(DuplexTransportConnection conn,
long timeOpened) {
this.conn = conn;
this.timeOpened = timeOpened;
}
}
}