org.mariadb.jdbc.internal.failover

Class AbstractMastersListener

java.lang.Object

org.mariadb.jdbc.internal.failover.AbstractMastersListener

All Implemented Interfaces:

Listener

Direct Known Subclasses:

AbstractMastersSlavesListener, MastersFailoverListener

public abstract class AbstractMastersListener
extends Object
implements Listener

Field Summary

Fields

Modifier and Type	Field and Description
protected AtomicInteger	currentConnectionAttempts
protected Protocol	currentProtocol
protected boolean	currentReadOnlyAsked
protected AtomicBoolean	explicitClosed
protected long	lastQueryNanos
protected long	lastRetry
protected FailoverProxy	proxy
UrlParser	urlParser

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractMastersListener(UrlParser urlParser)

Method Summary

Modifier and Type	Method and Description
void	addToBlacklist(HostAddress hostAddress) After a failover, put the hostAddress in a static list so the other connection will not take this host in account for a time.
boolean	canRetryFailLoop()
abstract boolean	checkMasterStatus(SearchFilter searchFilter)
static void	clearBlacklist() Clear blacklist data.
void	closeConnection(Protocol protocol) Utility to close existing connection.
Set<HostAddress>	getBlacklistKeys()
Protocol	getCurrentProtocol()
SearchFilter	getFilterForFailedHost()
long	getLastQueryNanos()
long	getMasterHostFailNanos()
FailoverProxy	getProxy()
int	getRetriesAllDown()
UrlParser	getUrlParser()
abstract void	handleFailLoop()
HandleErrorResult	handleFailover(QueryException qe, Method method, Object[] args, Protocol protocol) Call when a failover is detected on master connection.
boolean	hasHostFail()
void	initializeConnection() Initialize Listener.
Object	invoke(Method method, Object[] args)
Object	invoke(Method method, Object[] args, Protocol specificProtocol)
boolean	isAutoReconnect()
boolean	isClosed()
boolean	isExplicitClosed()
boolean	isMasterHostFail()
boolean	isQueryRelaunchable(Method method, Object[] args) Check if query can be re-executed.
boolean	isReadOnly()
protected boolean	pingMasterProtocol(Protocol protocol)
protected void	preAutoReconnect()
abstract void	preClose()
abstract void	preExecute()
abstract HandleErrorResult	primaryFail(Method method, Object[] args)
abstract void	reconnect()
abstract void	reconnectFailedConnection(SearchFilter filter)
HandleErrorResult	relaunchOperation(Method method, Object[] args) After a failover that has bean done, relaunch the operation that was in progress.
void	removeFromBlacklist(HostAddress hostAddress) After a successfull connection, permit to remove a hostAddress from blacklist.
protected void	removeListenerFromSchedulers()
protected void	resetMasterFailoverData()
void	resetOldsBlackListHosts() Permit to remove Host to blacklist after loadBalanceBlacklistTimeout seconds.
boolean	setMasterHostFail() Set master fail variables.
void	setProxy(FailoverProxy proxy)
protected void	setSessionReadOnly(boolean readOnly, Protocol protocol)
abstract void	switchReadOnlyConnection(Boolean readonly)
void	syncConnection(Protocol from, Protocol to) When switching between 2 connections, report existing connection parameter to the new used connection.
void	throwFailoverMessage(HostAddress failHostAddress, boolean wasMaster, QueryException queryException, boolean reconnected) Throw a human readable message after a failoverException.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.mariadb.jdbc.internal.failover.Listener

foundActiveMaster, isMasterConnected, rePrepareOnSlave

Field Detail

urlParser

public final UrlParser urlParser

currentConnectionAttempts

protected AtomicInteger currentConnectionAttempts

currentReadOnlyAsked

protected volatile boolean currentReadOnlyAsked

currentProtocol

protected Protocol currentProtocol

proxy

protected FailoverProxy proxy

lastRetry

protected long lastRetry

explicitClosed

protected AtomicBoolean explicitClosed

lastQueryNanos

protected long lastQueryNanos

Constructor Detail

AbstractMastersListener

protected AbstractMastersListener(UrlParser urlParser)

Method Detail

initializeConnection

public void initializeConnection()
                          throws QueryException

Initialize Listener. This listener will be added to the connection validation loop according to option value so the connection will be verified periodically. (Important for aurora, for other, connection pool often have this functionality)

Specified by:

initializeConnection in interface Listener

Throws:

QueryException - if any exception occur.

removeListenerFromSchedulers

protected void removeListenerFromSchedulers()

preAutoReconnect

protected void preAutoReconnect()
                         throws QueryException

Throws:

QueryException

getProxy

public FailoverProxy getProxy()

Specified by:

getProxy in interface Listener

setProxy

public void setProxy(FailoverProxy proxy)

Specified by:

setProxy in interface Listener

getBlacklistKeys

public Set<HostAddress> getBlacklistKeys()

Specified by:

getBlacklistKeys in interface Listener

handleFailover

public HandleErrorResult handleFailover(QueryException qe,
                                        Method method,
                                        Object[] args,
                                        Protocol protocol)
                                 throws Throwable

Call when a failover is detected on master connection. Will :

1. set fail variable
2. try to reconnect
3. relaunch query if possible

Specified by:

handleFailover in interface Listener

Parameters:

method - called method

args - methods parameters

protocol - current protocol

Returns:

a HandleErrorResult object to indicate if query has been relaunched, and the exception if not

Throws:

Throwable - when method and parameters does not exist.

addToBlacklist

public void addToBlacklist(HostAddress hostAddress)

After a failover, put the hostAddress in a static list so the other connection will not take this host in account for a time.

Specified by:

addToBlacklist in interface Listener

Parameters:

hostAddress - the HostAddress to add to blacklist

removeFromBlacklist

public void removeFromBlacklist(HostAddress hostAddress)

After a successfull connection, permit to remove a hostAddress from blacklist.

Specified by:

removeFromBlacklist in interface Listener

Parameters:

hostAddress - the host address tho be remove of blacklist

resetOldsBlackListHosts

public void resetOldsBlackListHosts()

Permit to remove Host to blacklist after loadBalanceBlacklistTimeout seconds.

resetMasterFailoverData

protected void resetMasterFailoverData()

setSessionReadOnly

protected void setSessionReadOnly(boolean readOnly,
                                  Protocol protocol)
                           throws QueryException

Throws:

QueryException

handleFailLoop

public abstract void handleFailLoop()

getCurrentProtocol

public Protocol getCurrentProtocol()

Specified by:

getCurrentProtocol in interface Listener

getMasterHostFailNanos

public long getMasterHostFailNanos()

setMasterHostFail

public boolean setMasterHostFail()

Set master fail variables.

Specified by:

setMasterHostFail in interface Listener

Returns:

true if was already failed

isMasterHostFail

public boolean isMasterHostFail()

Specified by:

isMasterHostFail in interface Listener

hasHostFail

public boolean hasHostFail()

Specified by:

hasHostFail in interface Listener

getFilterForFailedHost

public SearchFilter getFilterForFailedHost()

Specified by:

getFilterForFailedHost in interface Listener

relaunchOperation

public HandleErrorResult relaunchOperation(Method method,
                                           Object[] args)
                                    throws IllegalAccessException,
                                           InvocationTargetException

After a failover that has bean done, relaunch the operation that was in progress. In case of special operation that crash server, doesn't relaunched it;

Parameters:

method - the methode accessed

args - the parameters

Returns:

An object that indicate the result or that the exception as to be thrown

Throws:

IllegalAccessException - if the initial call is not permit

InvocationTargetException - if there is any error relaunching initial method

isQueryRelaunchable

public boolean isQueryRelaunchable(Method method,
                                   Object[] args)

Check if query can be re-executed.

Parameters:

method - invoke method

args - invoke arguments

Returns:

true if can be re-executed

invoke

public Object invoke(Method method,
                     Object[] args,
                     Protocol specificProtocol)
              throws Throwable

Specified by:

invoke in interface Listener

Throws:

Throwable

invoke

public Object invoke(Method method,
                     Object[] args)
              throws Throwable

Specified by:

invoke in interface Listener

Throws:

Throwable

syncConnection

public void syncConnection(Protocol from,
                           Protocol to)
                    throws QueryException

When switching between 2 connections, report existing connection parameter to the new used connection.

Specified by:

syncConnection in interface Listener

Parameters:

from - used connection

to - will-be-current connection

Throws:

QueryException - if catalog cannot be set

isClosed

public boolean isClosed()

Specified by:

isClosed in interface Listener

isReadOnly

public boolean isReadOnly()

Specified by:

isReadOnly in interface Listener

isExplicitClosed

public boolean isExplicitClosed()

Specified by:

isExplicitClosed in interface Listener

getRetriesAllDown

public int getRetriesAllDown()

Specified by:

getRetriesAllDown in interface Listener

isAutoReconnect

public boolean isAutoReconnect()

Specified by:

isAutoReconnect in interface Listener

getUrlParser

public UrlParser getUrlParser()

Specified by:

getUrlParser in interface Listener

preExecute

public abstract void preExecute()
                         throws QueryException

Specified by:

preExecute in interface Listener

Throws:

QueryException

preClose

public abstract void preClose()
                       throws SQLException

Specified by:

preClose in interface Listener

Throws:

SQLException

reconnectFailedConnection

public abstract void reconnectFailedConnection(SearchFilter filter)
                                        throws QueryException

Specified by:

reconnectFailedConnection in interface Listener

Throws:

QueryException

switchReadOnlyConnection

public abstract void switchReadOnlyConnection(Boolean readonly)
                                       throws QueryException

Specified by:

switchReadOnlyConnection in interface Listener

Throws:

QueryException

primaryFail

public abstract HandleErrorResult primaryFail(Method method,
                                              Object[] args)
                                       throws Throwable

Specified by:

primaryFail in interface Listener

Throws:

Throwable

throwFailoverMessage

public void throwFailoverMessage(HostAddress failHostAddress,
                                 boolean wasMaster,
                                 QueryException queryException,
                                 boolean reconnected)
                          throws QueryException

Throw a human readable message after a failoverException.

Specified by:

throwFailoverMessage in interface Listener

Parameters:

failHostAddress - failedHostAddress

wasMaster - was failed connection master

queryException - internal error

reconnected - connection status

Throws:

QueryException - error with failover information

canRetryFailLoop

public boolean canRetryFailLoop()

Specified by:

canRetryFailLoop in interface Listener

reconnect

public abstract void reconnect()
                        throws QueryException

Specified by:

reconnect in interface Listener

Throws:

QueryException

checkMasterStatus

public abstract boolean checkMasterStatus(SearchFilter searchFilter)

Specified by:

checkMasterStatus in interface Listener

clearBlacklist

public static void clearBlacklist()

Clear blacklist data.

getLastQueryNanos

public long getLastQueryNanos()

Specified by:

getLastQueryNanos in interface Listener

pingMasterProtocol

protected boolean pingMasterProtocol(Protocol protocol)

closeConnection

public void closeConnection(Protocol protocol)

Utility to close existing connection.

Parameters:

protocol - connection to close.