/**
* Test if a connection can be obtained
*
* @param subject Optional subject
* @param cri Optional CRI
* @return True if possible; otherwise false
*/
protected boolean internalTestConnection(ConnectionRequestInfo cri, Subject subject) {
boolean result = false;
ConnectionListener cl = null;
try {
boolean separateNoTx = false;
if (noTxSeparatePools) {
separateNoTx = clf.isTransactional();
}
Object key = getKey(subject, cri, separateNoTx);
ManagedConnectionPool mcp = getManagedConnectionPool(key, subject, cri);
if (mcp.getStatistics().getAvailableCount() > 0) {
cl = mcp.getConnection(subject, cri);
result = true;
}
} catch (Throwable ignored) {
// Ignore
} finally {
if (cl != null) {
try {
returnConnection(cl, false);
} catch (ResourceException ire) {
// Ignore
}
}
}
return result;
}
/**
* Gets simple connection listener that wraps connection.
*
* @param subject Subject instance
* @param cri Connection request info
* @param mcp The managed connection pool
* @return connection listener
* @throws ResourceException ResourceException
*/
private ConnectionListener getSimpleConnection(
final Subject subject, final ConnectionRequestInfo cri, final ManagedConnectionPool mcp)
throws ResourceException {
ConnectionListener cl = null;
try {
// Get connection from the managed connection pool
cl = mcp.getConnection(subject, cri);
if (trace) log.tracef("Got connection from pool: %s", cl);
return cl;
} catch (ResourceException re) {
if (re instanceof RetryableException) {
if (log.isDebugEnabled())
log.debug("Got a RetryableException - trying to reinitialize the pool");
// Make sure that the managed connection pool is running
if (!mcp.isRunning()) mcp.reenable();
// Getting connection from pool
cl = mcp.getConnection(subject, cri);
if (trace) log.tracef("Got connection from pool (retried): %s", cl);
return cl;
} else {
throw re;
}
}
}
/** {@inheritDoc} */
public ConnectionListener findConnectionListener(ManagedConnection mc, Object connection) {
for (ManagedConnectionPool mcp : mcpPools.values()) {
ConnectionListener cl = mcp.findConnectionListener(mc, connection);
if (cl != null) return cl;
}
return null;
}
/** {@inheritDoc} */
public void returnConnection(ConnectionListener cl, boolean kill) throws ResourceException {
cl.setTrackByTx(false);
// Get connection listener pool
ManagedConnectionPool mcp = cl.getManagedConnectionPool();
// Return connection to the pool
mcp.returnConnection(cl, kill);
if (trace) log.tracef("Returning connection to pool %s", cl);
}
/** {@inheritDoc} */
public void shutdown() {
log.debug(poolName + ": shutdown");
Iterator<ManagedConnectionPool> it = mcpPools.values().iterator();
while (it.hasNext()) {
ManagedConnectionPool mcp = it.next();
mcp.shutdown();
}
mcpPools.clear();
}
/**
* Gets new connection listener if necessary instance with transaction. This method is package
* protected beacause it is intended only for test case use. Please don't use it in your
* production code.
*
* @param trackByTransaction transaction instance
* @param mcp pool instance
* @param subject subject instance
* @param cri connection request info
* @return connection listener instance
* @throws ResourceException ResourceException
*/
ConnectionListener getTransactionNewConnection(
Transaction trackByTransaction,
ManagedConnectionPool mcp,
Subject subject,
ConnectionRequestInfo cri)
throws ResourceException {
// Need a new one for this transaction
// This must be done outside the tx local lock, otherwise
// the tx timeout won't work and get connection can do a lot of other work
// with many opportunities for deadlocks.
// Instead we do a double check after we got the transaction to see
// whether another thread beat us to the punch.
ConnectionListener cl = mcp.getConnection(subject, cri);
if (trace)
log.tracef(
"Got connection from pool tracked by transaction=%s tx=%s", cl, trackByTransaction);
TransactionSynchronizationRegistry tsr = getTransactionSynchronizationRegistry();
Lock lock = getLock();
try {
lock.lockInterruptibly();
} catch (InterruptedException ie) {
Thread.interrupted();
throw new ResourceException(bundle.unableObtainLock(), ie);
}
try {
// Check we weren't racing with another transaction
ConnectionListener other = (ConnectionListener) tsr.getResource(mcp);
if (other != null) {
mcp.returnConnection(cl, false);
if (trace)
log.tracef(
"Another thread already got a connection tracked by transaction=%s tx=%s",
other, trackByTransaction);
cl = other;
}
// This is the connection for this transaction
cl.setTrackByTx(true);
tsr.putResource(mcp, cl);
if (trace)
log.tracef(
"Using connection from pool tracked by transaction=%s tx=%s", cl, trackByTransaction);
return cl;
} finally {
lock.unlock();
}
}
/** {@inheritDoc} */
public synchronized void emptyManagedConnectionPool(ManagedConnectionPool pool) {
log.debug(poolName + ": emptyManagedConnectionPool(" + pool + ")");
if (pool != null) {
// We only consider removal if there are more than 1 managed connection pool
if (mcpPools.size() > 1) {
Iterator<ManagedConnectionPool> it = mcpPools.values().iterator();
while (it.hasNext()) {
ManagedConnectionPool other = it.next();
if (other == pool && pool.isEmpty()) {
pool.shutdown();
it.remove();
break;
}
}
}
}
}
/** {@inheritDoc} */
public synchronized void flush(FlushMode mode) {
log.debug(poolName + ": flush(" + mode + ")");
Set<ManagedConnectionPool> clearMcpPools = new HashSet<ManagedConnectionPool>();
Iterator<ManagedConnectionPool> it = mcpPools.values().iterator();
while (it.hasNext()) {
ManagedConnectionPool mcp = it.next();
mcp.flush(mode);
if (mcp.isEmpty()) clearMcpPools.add(mcp);
}
if (clearMcpPools.size() > 0) {
for (ManagedConnectionPool mcp : clearMcpPools) {
mcp.shutdown();
mcpPools.values().remove(mcp);
}
}
}
