void _open() throws IOException {
long sleepTime = 100;
final long start = System.currentTimeMillis();
while (true) {
IOException lastError = null;
try {
_sock = SocketChannel.open();
_socket = _sock.socket();
_socket.connect(_addr, _options.connectTimeout);
_socket.setTcpNoDelay(!USE_NAGLE);
_socket.setSoTimeout(_options.socketTimeout);
_in = _socket.getInputStream();
return;
} catch (IOException ioe) {
// TODO - erh to fix lastError = new IOException( "couldn't connect to [" +
// _addr + "] bc:" + lastError , lastError );
lastError = new IOException("couldn't connect to [" + _addr + "] bc:" + ioe);
_logger.log(Level.INFO, "connect fail to : " + _addr, ioe);
}
if (!_options.autoConnectRetry || (_pool != null && !_pool._everWorked)) throw lastError;
long sleptSoFar = System.currentTimeMillis() - start;
if (sleptSoFar >= CONN_RETRY_TIME_MS) throw lastError;
if (sleepTime + sleptSoFar > CONN_RETRY_TIME_MS) sleepTime = CONN_RETRY_TIME_MS - sleptSoFar;
_logger.severe(
"going to sleep and retry. total sleep time after = "
+ (sleptSoFar + sleptSoFar)
+ "ms this time:"
+ sleepTime
+ "ms");
ThreadUtil.sleep(sleepTime);
sleepTime *= 2;
}
}
class DBPortPool extends SimplePool<DBPort> {
static class Holder {
Holder(MongoOptions options) {
_options = options;
}
DBPortPool get(InetSocketAddress addr) {
DBPortPool p = _pools.get(addr);
if (p != null) return p;
synchronized (_pools) {
p = _pools.get(addr);
if (p != null) {
return p;
}
p = new DBPortPool(addr, _options);
_pools.put(addr, p);
String name = "com.mongodb:type=ConnectionPool,host=" + addr.toString().replace(':', '_');
try {
ObjectName on = new ObjectName(name);
if (_server.isRegistered(on)) {
_server.unregisterMBean(on);
Bytes.LOGGER.log(
Level.INFO, "multiple Mongo instances for same host, jmx numbers might be off");
}
_server.registerMBean(p, on);
} catch (JMException e) {
Bytes.LOGGER.log(Level.WARNING, "jmx registration error, continuing", e);
} catch (java.security.AccessControlException e) {
Bytes.LOGGER.log(Level.WARNING, "jmx registration error, continuing", e);
}
}
return p;
}
void close() {
synchronized (_pools) {
for (DBPortPool p : _pools.values()) {
p.close();
}
}
}
final MongoOptions _options;
final Map<InetSocketAddress, DBPortPool> _pools =
Collections.synchronizedMap(new HashMap<InetSocketAddress, DBPortPool>());
final MBeanServer _server = ManagementFactory.getPlatformMBeanServer();
}
// ----
public static class NoMoreConnection extends MongoInternalException {
NoMoreConnection(String msg) {
super(msg);
}
}
public static class SemaphoresOut extends NoMoreConnection {
SemaphoresOut() {
super("Out of semaphores to get db connection");
}
}
public static class ConnectionWaitTimeOut extends NoMoreConnection {
ConnectionWaitTimeOut(int timeout) {
super("Connection wait timeout after " + timeout + " ms");
}
}
// ----
DBPortPool(InetSocketAddress addr, MongoOptions options) {
super("DBPortPool-" + addr.toString(), options.connectionsPerHost, options.connectionsPerHost);
_options = options;
_addr = addr;
_waitingSem =
new Semaphore(
_options.connectionsPerHost * _options.threadsAllowedToBlockForConnectionMultiplier);
}
protected long memSize(DBPort p) {
return 0;
}
protected int pick(int iThink, boolean couldCreate) {
final int id = Thread.currentThread().hashCode();
final int s = _availSafe.size();
for (int i = 0; i < s; i++) {
DBPort p = _availSafe.get(i);
if (p._lastThread == id) return i;
}
if (couldCreate) return -1;
return iThink;
}
public DBPort get() {
DBPort port = null;
if (!_waitingSem.tryAcquire()) throw new SemaphoresOut();
try {
port = get(_options.maxWaitTime);
} finally {
_waitingSem.release();
}
if (port == null) throw new ConnectionWaitTimeOut(_options.maxWaitTime);
port._lastThread = Thread.currentThread().hashCode();
return port;
}
void gotError(Exception e) {
if (e instanceof java.nio.channels.ClosedByInterruptException
|| e instanceof InterruptedException) {
// this is probably a request that is taking too long
// so usually doesn't mean there is a real db problem
return;
}
if (e instanceof java.net.SocketTimeoutException && _options.socketTimeout > 0) {
// we don't want to clear the port pool for 1 connection timing out
return;
}
// We don't want to clear the entire pool for the occasional error.
if (e instanceof SocketException) {
if (recentFailures < ALLOWED_ERRORS_BEFORE_CLEAR) {
return;
}
}
Bytes.LOGGER.log(Level.INFO, "emptying DBPortPool b/c of error", e);
clear();
}
void close() {
clear();
}
public void cleanup(DBPort p) {
p.close();
}
public boolean ok(DBPort t) {
return _addr.equals(t._addr);
}
protected DBPort createNew() throws MongoInternalException {
try {
return new DBPort(_addr, this, _options);
} catch (IOException ioe) {
throw new MongoInternalException("can't create port to:" + _addr, ioe);
}
}
public int getRecentFailures() {
return recentFailures;
}
public void incrementRecentFailures() {
_logger.warning("Failure recorded:" + _addr.toString());
this.recentFailures++;
}
public void resetRecentFailures() {
if (this.recentFailures > 0) {
_logger.warning("Successful Request. Reseting recent failures:" + _addr.toString());
}
this.recentFailures = 0;
}
final MongoOptions _options;
private final Semaphore _waitingSem;
final InetSocketAddress _addr;
boolean _everWorked = false;
public static final Integer ALLOWED_ERRORS_BEFORE_CLEAR =
Integer.valueOf(System.getProperty("MONGO.ERRORS_BEFORE_CLEAR", "5"));
private Logger _logger = Logger.getLogger(DBPortPool.class.toString());
/** The number of failures that this port pool has recently experienced. */
private int recentFailures = 0;
}