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 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();
}
class DBTCPConnector implements DBConnector {
static Logger _logger = Logger.getLogger(Bytes.LOGGER.getName() + ".tcp");
static Logger _createLogger = Logger.getLogger(_logger.getName() + ".connect");
public DBTCPConnector(Mongo m, ServerAddress addr) throws MongoException {
_mongo = m;
_portHolder = new DBPortPool.Holder(m._options);
_checkAddress(addr);
_createLogger.info(addr.toString());
if (addr.isPaired()) {
_allHosts = new ArrayList<ServerAddress>(addr.explode());
_createLogger.info("switch to paired mode : " + _allHosts + " -> " + _curAddress);
} else {
_set(addr);
_allHosts = null;
}
}
public DBTCPConnector(Mongo m, ServerAddress... all) throws MongoException {
this(m, Arrays.asList(all));
}
public DBTCPConnector(Mongo m, List<ServerAddress> all) throws MongoException {
_mongo = m;
_portHolder = new DBPortPool.Holder(m._options);
_checkAddress(all);
_allHosts = new ArrayList<ServerAddress>(all); // make a copy so it can't be modified
_createLogger.info(all + " -> " + _curAddress);
}
private static ServerAddress _checkAddress(ServerAddress addr) {
if (addr == null) throw new NullPointerException("address can't be null");
return addr;
}
private static ServerAddress _checkAddress(List<ServerAddress> addrs) {
if (addrs == null) throw new NullPointerException("addresses can't be null");
if (addrs.size() == 0) throw new IllegalArgumentException("need to specify at least 1 address");
return addrs.get(0);
}
/**
* Start a "request".
*
* <p>A "request" is a group of operations in which order matters. Examples include inserting a
* document and then performing a query which expects that document to have been inserted, or
* performing an operation and then using com.mongodb.Mongo.getLastError to perform error-checking
* on that operation. When a thread performs operations in a "request", all operations will be
* performed on the same socket, so they will be correctly ordered.
*/
public void requestStart() {
_threadPort.get().requestStart();
}
/**
* End the current "request", if this thread is in one.
*
* <p>By ending a request when it is safe to do so the built-in connection- pool is allowed to
* reassign requests to different sockets in order to more effectively balance load. See
* requestStart for more information.
*/
public void requestDone() {
_threadPort.get().requestDone();
}
public void requestEnsureConnection() {
_threadPort.get().requestEnsureConnection();
}
WriteResult _checkWriteError(MyPort mp, DBPort port) throws MongoException {
CommandResult e = _mongo.getDB("admin").getLastError();
mp.done(port);
Object foo = e.get("err");
if (foo == null) return new WriteResult(e);
int code = -1;
if (e.get("code") instanceof Number) code = ((Number) e.get("code")).intValue();
String s = foo.toString();
if (code == 11000 || code == 11001 || s.startsWith("E11000") || s.startsWith("E11001"))
throw new MongoException.DuplicateKey(code, s);
throw new MongoException(code, s);
}
public WriteResult say(DB db, OutMessage m, DB.WriteConcern concern) throws MongoException {
MyPort mp = _threadPort.get();
DBPort port = mp.get(true);
port.checkAuth(db);
try {
port.say(m);
if (concern == DB.WriteConcern.STRICT) {
return _checkWriteError(mp, port);
} else {
mp.done(port);
return new WriteResult(db, port);
}
} catch (IOException ioe) {
mp.error(ioe);
_error(ioe);
if (concern == DB.WriteConcern.NONE) {
CommandResult res = new CommandResult();
res.put("ok", false);
res.put("$err", "NETWORK ERROR");
return new WriteResult(res);
}
throw new MongoException.Network("can't say something", ioe);
} catch (MongoException me) {
throw me;
} catch (RuntimeException re) {
mp.error(re);
throw re;
}
}
public Response call(DB db, DBCollection coll, OutMessage m) throws MongoException {
return call(db, coll, m, 2);
}
public Response call(DB db, DBCollection coll, OutMessage m, int retries) throws MongoException {
final MyPort mp = _threadPort.get();
final DBPort port = mp.get(false);
port.checkAuth(db);
Response res = null;
try {
res = port.call(m, coll);
mp.done(port);
} catch (IOException ioe) {
mp.error(ioe);
if (_error(ioe) && retries > 0) {
return call(db, coll, m, retries - 1);
}
throw new MongoException.Network("can't call something", ioe);
} catch (RuntimeException re) {
mp.error(re);
throw re;
}
ServerError err = res.getError();
if (err != null && err.isNotMasterError()) {
_pickCurrent();
if (retries <= 0) {
throw new MongoException("not talking to master and retries used up");
}
return call(db, coll, m, retries - 1);
}
return res;
}
public ServerAddress getAddress() {
return _curAddress;
}
public List<ServerAddress> getAllAddress() {
return _allHosts;
}
public String getConnectPoint() {
return _curAddress.toString();
}
boolean _error(Throwable t) throws MongoException {
if (_allHosts != null) {
System.out.println("paired mode, switching master b/c of: " + t);
t.printStackTrace();
_pickCurrent();
}
return true;
}
class MyPort {
DBPort get(boolean keep) {
_internalStack++;
if (_internalStack > 1) {
if (_last == null) {
System.err.println("_internalStack > 1 and _last is null!");
} else {
return _last;
}
}
if (_port != null) return _port;
try {
DBPort p = _curPortPool.get();
if (keep && _inRequest) _port = p;
_last = p;
return p;
} catch (DBPortPool.NoMoreConnection nmc) {
_internalStack = 0;
throw nmc;
}
}
void done(DBPort p) {
if (_internalStack <= 0) {
int prev = _internalStack;
_reset();
throw new IllegalStateException("done called and _internalStack was: " + _internalStack);
}
_internalStack--;
if (p != _port && _internalStack == 0) _curPortPool.done(p);
if (_internalStack < 0) {
System.err.println("_internalStack < 0 : " + _internalStack);
_internalStack = 0;
}
}
void error(Exception e) {
_curPortPool.remove(_port);
_curPortPool.gotError(e);
_internalStack = 0;
_last = null;
}
void requestEnsureConnection() {
if (!_inRequest) return;
if (_port != null) return;
_port = _curPortPool.get();
}
void requestStart() {
_inRequest = true;
if (_port != null) {
_port = null;
System.err.println("ERROR. somehow _port was not null at requestStart");
}
}
void requestDone() {
if (_port != null) _curPortPool.done(_port);
_port = null;
_inRequest = false;
if (_internalStack > 0) {
System.err.println("_internalStack in requestDone should be 0 is: " + _internalStack);
_internalStack = 0;
}
}
void _reset() {
_internalStack = 0;
_port = null;
_last = null;
}
int _internalStack = 0;
DBPort _port;
DBPort _last;
boolean _inRequest;
}
void _pickInitial() throws MongoException {
if (_curAddress != null) return;
// we need to just get a server to query for ismaster
_pickCurrent();
try {
_logger.info("current address beginning of _pickInitial: " + _curAddress);
DBObject im = isMasterCmd();
if (_isMaster(im)) return;
synchronized (_allHosts) {
Collections.shuffle(_allHosts);
for (ServerAddress a : _allHosts) {
if (_curAddress == a) continue;
_logger.info("remote [" + _curAddress + "] -> [" + a + "]");
_set(a);
im = isMasterCmd();
if (_isMaster(im)) return;
_logger.severe("switched to: " + a + " but isn't master");
}
throw new MongoException("can't find master");
}
} catch (Exception e) {
_logger.log(Level.SEVERE, "can't pick initial master, using random one", e);
}
}
private void _pickCurrent() throws MongoException {
if (_allHosts == null)
throw new MongoException(
"got master/slave issue but not in master/slave mode on the client side");
synchronized (_allHosts) {
Collections.shuffle(_allHosts);
for (int i = 0; i < _allHosts.size(); i++) {
ServerAddress a = _allHosts.get(i);
if (a == _curAddress) continue;
if (_curAddress != null) {
_logger.info("switching from [" + _curAddress + "] to [" + a + "]");
}
_set(a);
return;
}
}
throw new MongoException("couldn't find a new host to swtich too");
}
private boolean _set(ServerAddress addr) {
if (_curAddress == addr) return false;
_curAddress = addr;
_curPortPool = _portHolder.get(addr.getSocketAddress());
return true;
}
public String debugString() {
StringBuilder buf = new StringBuilder("DBTCPConnector: ");
if (_allHosts != null) buf.append("paired : ").append(_allHosts);
else buf.append(_curAddress).append(" ").append(_curAddress._addr);
return buf.toString();
}
DBObject isMasterCmd() {
DBCollection collection = _mongo.getDB("admin").getCollection("$cmd");
Iterator<DBObject> i = collection.__find(_isMaster, null, 0, 1, 0);
if (i == null || !i.hasNext()) throw new MongoException("no result for ismaster query?");
DBObject res = i.next();
if (i.hasNext()) throw new MongoException("what's going on");
return res;
}
boolean _isMaster(DBObject res) {
Object x = res.get("ismaster");
if (x == null) throw new IllegalStateException("ismaster shouldn't be null: " + res);
if (x instanceof Boolean) return (Boolean) x;
if (x instanceof Number) return ((Number) x).intValue() == 1;
throw new IllegalArgumentException("invalid ismaster [" + x + "] : " + x.getClass().getName());
}
public void close() {
_portHolder.close();
}
final Mongo _mongo;
private ServerAddress _curAddress;
private DBPortPool _curPortPool;
private DBPortPool.Holder _portHolder;
private final List<ServerAddress> _allHosts;
private final ThreadLocal<MyPort> _threadPort =
new ThreadLocal<MyPort>() {
protected MyPort initialValue() {
return new MyPort();
}
};
private static final DBObject _isMaster = BasicDBObjectBuilder.start().add("ismaster", 1).get();
}
