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Limit the size of the DB connection pool.

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This commit is contained in:
akwizgran
2022-04-08 15:00:48 +01:00
parent 5d952ff68e
commit 47d412dd0a
1 changed files with 19 additions and 10 deletions
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29
bramble-core/src/main/java/org/briarproject/bramble/db/JdbcDatabase.java
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@@ -103,6 +103,11 @@ abstract class JdbcDatabase implements Database<Connection> {
// Package access for testing
static final int CODE_SCHEMA_VERSION = 50;
/**
* The maximum number of idle connections to keep open.
*/
private static final int MAX_CONNECTION_POOL_SIZE = 10;
// Time period offsets for incoming transport keys
private static final int OFFSET_PREV = -1;
private static final int OFFSET_CURR = 0;
@@ -364,7 +369,7 @@ abstract class JdbcDatabase implements Database<Connection> {
private final Condition connectionsChanged = connectionsLock.newCondition();
@GuardedBy("connectionsLock")
private final LinkedList<Connection> connections = new LinkedList<>();
private final LinkedList<Connection> connectionPool = new LinkedList<>();
@GuardedBy("connectionsLock")
private int openConnections = 0;
@@ -572,7 +577,7 @@ abstract class JdbcDatabase implements Database<Connection> {
connectionsLock.lock();
try {
if (closed) throw new DbClosedException();
txn = connections.poll();
txn = connectionPool.poll();
logConnectionCounts();
} finally {
connectionsLock.unlock();
@@ -606,7 +611,7 @@ abstract class JdbcDatabase implements Database<Connection> {
private void logConnectionCounts() {
if (LOG.isLoggable(FINE)) {
LOG.fine(openConnections + " connections open, "
+ connections.size() + " in pool");
+ connectionPool.size() + " in pool");
}
}
@@ -649,14 +654,18 @@ abstract class JdbcDatabase implements Database<Connection> {
}
private void returnConnectionToPool(Connection txn) {
boolean shouldClose;
connectionsLock.lock();
try {
connections.add(txn);
shouldClose = connectionPool.size() >= MAX_CONNECTION_POOL_SIZE;
if (shouldClose) openConnections--;
else connectionPool.add(txn);
logConnectionCounts();
connectionsChanged.signalAll();
} finally {
connectionsLock.unlock();
}
if (shouldClose) tryToClose(txn, LOG, WARNING);
}
void closeAllConnections() {
@@ -664,9 +673,9 @@ abstract class JdbcDatabase implements Database<Connection> {
connectionsLock.lock();
try {
closed = true;
for (Connection c : connections) tryToClose(c, LOG, WARNING);
openConnections -= connections.size();
connections.clear();
for (Connection c : connectionPool) tryToClose(c, LOG, WARNING);
openConnections -= connectionPool.size();
connectionPool.clear();
while (openConnections > 0) {
if (LOG.isLoggable(INFO)) {
LOG.info("Waiting for " + openConnections
@@ -678,9 +687,9 @@ abstract class JdbcDatabase implements Database<Connection> {
LOG.warning("Interrupted while closing connections");
interrupted = true;
}
for (Connection c : connections) tryToClose(c, LOG, WARNING);
openConnections -= connections.size();
connections.clear();
for (Connection c : connectionPool) tryToClose(c, LOG, WARNING);
openConnections -= connectionPool.size();
connectionPool.clear();
}
LOG.info("All connections closed");
} finally {