org.postgresql.core
Class ConnectionFactory

java.lang.Object
  org.postgresql.core.ConnectionFactory

Direct Known Subclasses:

ConnectionFactoryImpl, ConnectionFactoryImpl

public abstract class ConnectionFactory
extends Object

Handles protocol-specific connection setup.

Author:

Oliver Jowett ([email protected])

Constructor Summary

ConnectionFactory()

Method Summary

protected void	closeStream(PGStream newStream) Safely close the given stream.
static ProtocolConnection	openConnection(HostSpec[] hostSpecs, String user, String database, Properties info, Logger logger) Establishes and initializes a new connection.
abstract ProtocolConnection	openConnectionImpl(HostSpec[] hostSpecs, String user, String database, Properties info, Logger logger) Implementation of openConnection(org.postgresql.util.HostSpec[], java.lang.String, java.lang.String, java.util.Properties, org.postgresql.core.Logger) for a particular protocol version.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConnectionFactory

public ConnectionFactory()

Method Detail

openConnection

public static ProtocolConnection openConnection(HostSpec[] hostSpecs,
                                                String user,
                                                String database,
                                                Properties info,
                                                Logger logger)
                                         throws SQLException

Establishes and initializes a new connection.

If the "protocolVersion" property is specified, only that protocol version is tried. Otherwise, all protocols are tried in order, falling back to older protocols as necessary.

Currently, protocol versions 3 (7.4+) and 2 (pre-7.4) are supported.

Parameters:

hostSpecs - at least one host and port to connect to; multiple elements for round-robin failover

user - the username to authenticate with; may not be null.

database - the database on the server to connect to; may not be null.

info - extra properties controlling the connection; notably, "password" if present supplies the password to authenticate with.

logger - the logger to use for this connection

Returns:

the new, initialized, connection

Throws:

SQLException - if the connection could not be established.

openConnectionImpl

public abstract ProtocolConnection openConnectionImpl(HostSpec[] hostSpecs,
                                                      String user,
                                                      String database,
                                                      Properties info,
                                                      Logger logger)
                                               throws SQLException

Implementation of openConnection(org.postgresql.util.HostSpec[], java.lang.String, java.lang.String, java.util.Properties, org.postgresql.core.Logger) for a particular protocol version. Implemented by subclasses of ConnectionFactory.

Parameters:

hostSpecs - at least one host and port to connect to; multiple elements for round-robin failover

user - the username to authenticate with; may not be null.

database - the database on the server to connect to; may not be null.

info - extra properties controlling the connection; notably, "password" if present supplies the password to authenticate with.

logger - the logger to use for this connection

Returns:

the new, initialized, connection, or null if this protocol version is not supported by the server.

Throws:

SQLException - if the connection could not be established for a reason other than protocol version incompatibility.

closeStream

protected void closeStream(PGStream newStream)

Safely close the given stream.

Parameters:

newStream - The stream to close.