org.postgresql.quickautobalance

Class ConnectionManager

java.lang.Object

org.postgresql.quickautobalance.ConnectionManager

public class ConnectionManager
extends Object

Connection manager of quick load balancing.

Method Summary

Modifier and Type	Method and Description
int	checkClusterStates() Check datanode states of each cluster.
List<Integer>	checkConnectionsValidity() Check whether the connections are valid in each cluster, and remove invalid connections.
static boolean	checkEnableLeastConn(Properties properties) check whether the properties enable leastconn.
static boolean	checkEnableQuickAutoBalance(Properties properties) Check a properties if enable quickAutoBalance.
void	clear() Clear connection manager.
List<Integer>	closeConnections() Choose abandoned connections from abandonedConnections of each cluster.
int	decrementCachedCreatingConnectionSize(HostSpec hostSpec, Properties properties) Decrement cachedCreatingConnectionSize.
int	getCachedConnectionSize() Get cached connection size.
Cluster	getCluster(String URLIdentifier)
static ConnectionManager	getInstance() Get instance.
static String	getURLIdentifierFromUrl(String url) Get URLIdentifier from url, which is a unique id of cluster.
int	incrementCachedCreatingConnectionSize(HostSpec hostSpec, Properties properties) Increment cachedCreatingConnectionSize.
boolean	setCluster(Properties properties) Set cluster into connection manager.
boolean	setConnection(PgConnection pgConnection, Properties properties) Cache this connection, if it's configured with autoBalance = "leastconn".
void	setConnectionState(PgConnection pgConnection, StatementCancelState state) Set connection state of cached connections if it exists.

Methods inherited from class java.lang.Object

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

Method Detail

closeConnections

public List<Integer> closeConnections()

Choose abandoned connections from abandonedConnections of each cluster. The number of connections that each cluster closes : CLOSE_CONNECTION_PERIOD * CLOSE_CONNECTION_PER_SECOND.

Returns:

the number of connections closed per cluster

checkEnableLeastConn

public static boolean checkEnableLeastConn(Properties properties)

check whether the properties enable leastconn.

Parameters:

properties - properties

Returns:

whether the properties enable leastconn.

checkEnableQuickAutoBalance

public static boolean checkEnableQuickAutoBalance(Properties properties)

Check a properties if enable quickAutoBalance.

Parameters:

properties - properties

Returns:

if enable quickAutoBalance

getInstance

public static ConnectionManager getInstance()

Get instance.

Returns:

connectionManager

setCluster

public boolean setCluster(Properties properties)
                   throws PSQLException

Set cluster into connection manager.

Parameters:

properties - properties

Returns:

set or not.

Throws:

PSQLException

setConnection

public boolean setConnection(PgConnection pgConnection,
                             Properties properties)
                      throws PSQLException

Cache this connection, if it's configured with autoBalance = "leastconn".

Parameters:

pgConnection - connection

properties - properties

Returns:

if insert the connection into connectionManager.

Throws:

PSQLException

setConnectionState

public void setConnectionState(PgConnection pgConnection,
                               StatementCancelState state)
                        throws PSQLException

Set connection state of cached connections if it exists.

Parameters:

pgConnection - pgConnection

state - state

Throws:

PSQLException

getCluster

public Cluster getCluster(String URLIdentifier)

getURLIdentifierFromUrl

public static String getURLIdentifierFromUrl(String url)
                                      throws PSQLException

Get URLIdentifier from url, which is a unique id of cluster.

Parameters:

url - url

Returns:

URLIdentifier

Throws:

PSQLException

checkConnectionsValidity

public List<Integer> checkConnectionsValidity()

Check whether the connections are valid in each cluster, and remove invalid connections.

Returns:

the number of connections removed from cache.

checkClusterStates

public int checkClusterStates()

Check datanode states of each cluster.

Returns:

the number of invalid data nodes of all cluster

incrementCachedCreatingConnectionSize

public int incrementCachedCreatingConnectionSize(HostSpec hostSpec,
                                                 Properties properties)

Increment cachedCreatingConnectionSize. CachedCreatingConnectionSize indicates the number of connections that have been load balanced, but haven't been cached into cachedConnectionList yet.

Parameters:

hostSpec - hostSpec

properties - properties

Returns:

cachedCreatingConnectionSize after updating

decrementCachedCreatingConnectionSize

public int decrementCachedCreatingConnectionSize(HostSpec hostSpec,
                                                 Properties properties)

Decrement cachedCreatingConnectionSize. CachedCreatingConnectionSize indicates the number of connections that have been load balanced, but haven't been cached into cachedConnectionList yet.

Parameters:

hostSpec - hostSpec

properties - properties

Returns:

cachedCreatingConnectionSize after updating

clear

public void clear()

Clear connection manager.

getCachedConnectionSize

public int getCachedConnectionSize()

Get cached connection size.

Returns:

cached connection size