com.mysql.cj.jdbc.ha.plugins.efm2

Class Monitor

java.lang.Object

com.mysql.cj.jdbc.ha.plugins.efm2.Monitor

All Implemented Interfaces:

IMonitor, java.lang.AutoCloseable, java.lang.Runnable

public class Monitor
extends java.lang.Object
implements IMonitor

This class uses a background thread to monitor a particular server with one or more active Connection.

Field Summary

Fields

Modifier and Type	Field and Description
protected static java.util.concurrent.Executor	ABORT_EXECUTOR
protected static java.lang.String	MONITORING_PROPERTY_PREFIX
protected static long	THREAD_SLEEP_NANO

Constructor Summary

Constructors

Constructor and Description
Monitor(IConnectionProvider connectionProvider, HostInfo hostInfo, PropertySet propertySet, int failureDetectionTimeMillis, int failureDetectionIntervalMillis, int failureDetectionCount, Log logger) Store the monitoring configuration for a connection.

Method Summary

Modifier and Type	Method and Description
boolean	canDispose()
void	clearContexts()
void	close()
void	newContextRun()
void	run()
void	startMonitoring(MonitorConnectionContext context)

Methods inherited from class java.lang.Object

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

Field Detail

MONITORING_PROPERTY_PREFIX

protected static final java.lang.String MONITORING_PROPERTY_PREFIX

See Also:

Constant Field Values

THREAD_SLEEP_NANO

protected static final long THREAD_SLEEP_NANO

ABORT_EXECUTOR

protected static final java.util.concurrent.Executor ABORT_EXECUTOR

Constructor Detail

Monitor

public Monitor(IConnectionProvider connectionProvider,
               HostInfo hostInfo,
               PropertySet propertySet,
               int failureDetectionTimeMillis,
               int failureDetectionIntervalMillis,
               int failureDetectionCount,
               Log logger)

Store the monitoring configuration for a connection.

Parameters:

connectionProvider - A provider for creating new connections.

hostInfo - The HostInfo of the server this Monitor instance is monitoring.

propertySet - The PropertySet containing additional monitoring configuration.

failureDetectionTimeMillis - Grace period after which node monitoring starts.

failureDetectionIntervalMillis - Interval between each failed connection check.

failureDetectionCount - Number of failed connection checks before considering database node as unhealthy.

logger - A Log implementation.

Method Detail

canDispose

public boolean canDispose()

Specified by:

canDispose in interface IMonitor

close

public void close()
           throws java.lang.Exception

Specified by:

close in interface java.lang.AutoCloseable

Throws:

java.lang.Exception

startMonitoring

public void startMonitoring(MonitorConnectionContext context)

Specified by:

startMonitoring in interface IMonitor

clearContexts

public void clearContexts()

newContextRun

public void newContextRun()

run

public void run()

Specified by:

run in interface java.lang.Runnable