程序包 com.mysql.cj.jdbc.ha

类 MultiHostConnectionProxy

java.lang.Object

com.mysql.cj.jdbc.ha.MultiHostConnectionProxy

所有已实现的接口:

InvocationHandler

直接已知子类:

FailoverConnectionProxy, LoadBalancedConnectionProxy, ReplicationConnectionProxy

public abstract class MultiHostConnectionProxy
extends Object
implements InvocationHandler

An abstract class that processes generic multi-host configurations. This class has to be sub-classed by specific multi-host implementations, such as load-balancing and failover.

字段概要

字段

修饰符和类型	字段	说明
protected ConnectionUrl	connectionUrl
protected Throwable	lastExceptionDealtWith

方法概要

修饰符和类型	方法	说明
protected boolean	allowedOnClosedConnection(Method method)	Checks if the given method is allowed on closed connections.
protected JdbcConnection	getParentProxy()	Get this connection's parent proxy.
protected JdbcConnection	getProxy()	Get this connection's proxy.
Object	invoke(Object proxy, Method method, Object[] args)	Proxies method invocation on the java.sql.Connection interface, trapping multi-host specific methods and generic methods.
protected void	propagateProxyDown(JdbcConnection proxyConn)	Propagates the connection proxy down through the multi-host connections chain.
protected void	setProxy(JdbcConnection proxyConn)	Sets this connection's proxy.

从类继承的方法 java.lang.Object

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

字段详细资料

connectionUrl

protected ConnectionUrl connectionUrl

lastExceptionDealtWith

protected Throwable lastExceptionDealtWith

方法详细资料

getProxy

protected JdbcConnection getProxy()

Get this connection's proxy. A multi-host connection may not be at top level in the multi-host connections chain. In such case the first connection in the chain is available as a proxy.

返回:

Returns this connection's proxy if there is one or itself if this is the first one.

getParentProxy

protected JdbcConnection getParentProxy()

Get this connection's parent proxy.

返回:

Returns this connection's proxy if there is one.

setProxy

protected final void setProxy(JdbcConnection proxyConn)

Sets this connection's proxy. This proxy should be the first connection in the multi-host connections chain. After setting the connection proxy locally, propagates it through the dependent connections.

参数:

proxyConn - The top level connection in the multi-host connections chain.

propagateProxyDown

protected void propagateProxyDown(JdbcConnection proxyConn)

Propagates the connection proxy down through the multi-host connections chain. This method is intended to be overridden in subclasses that manage more than one active connection at same time.

参数:

proxyConn - The top level connection in the multi-host connections chain.

invoke

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

Proxies method invocation on the java.sql.Connection interface, trapping multi-host specific methods and generic methods. Subclasses have to override this to complete the method invocation process, deal with exceptions and decide when to switch connection. To avoid unnecessary additional exception handling overriders should consult #canDealWith(Method) before chaining here.

指定者:

invoke 在接口中 InvocationHandler

参数:

proxy - proxy object

method - method to invoke

args - method parameters

返回:

method result

抛出:

Throwable - if an error occurs

allowedOnClosedConnection

protected boolean allowedOnClosedConnection(Method method)

Checks if the given method is allowed on closed connections.

参数:

method - method

返回:

true if the given method is allowed on closed connections