software.amazon.jdbc.plugin.efm2

Class HostMonitorImpl

java.lang.Object

software.amazon.jdbc.util.monitoring.AbstractMonitor

software.amazon.jdbc.plugin.efm2.HostMonitorImpl

All Implemented Interfaces:

java.lang.AutoCloseable, java.lang.Runnable, HostMonitor, Monitor

public class HostMonitorImpl
extends AbstractMonitor
implements HostMonitor

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

Fields inherited from class software.amazon.jdbc.util.monitoring.AbstractMonitor

lastActivityTimestampNanos, monitorExecutor, state, stop, terminationTimeoutSec

Constructor Summary

Constructors

Constructor and Description
HostMonitorImpl(@NonNull ConnectionService connectionService, @NonNull TelemetryFactory telemetryFactory, @NonNull HostSpec hostSpec, @NonNull java.util.Properties properties, int failureDetectionTimeMillis, int failureDetectionIntervalMillis, int failureDetectionCount, TelemetryCounter abortedConnectionsCounter) Store the monitoring configuration for a connection.

Method Summary

Modifier and Type	Method and Description
boolean	canDispose() Defines whether this monitor can be disposed.
void	close() Closes all resources used by this monitor.
void	monitor() Executes the monitoring loop for this monitor.
void	newContextRun()
void	start() Submits this monitor in a separate thread to begin its monitoring tasks.
void	startMonitoring(HostMonitorConnectionContext context)

Methods inherited from class software.amazon.jdbc.util.monitoring.AbstractMonitor

getLastActivityTimestampNanos, getState, run, stop

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Runnable

run

Field Detail

ABORT_EXECUTOR

protected static final java.util.concurrent.Executor ABORT_EXECUTOR

Constructor Detail

HostMonitorImpl

public HostMonitorImpl(@NonNull ConnectionService connectionService,
                       @NonNull TelemetryFactory telemetryFactory,
                       @NonNull HostSpec hostSpec,
                       @NonNull java.util.Properties properties,
                       int failureDetectionTimeMillis,
                       int failureDetectionIntervalMillis,
                       int failureDetectionCount,
                       TelemetryCounter abortedConnectionsCounter)

Store the monitoring configuration for a connection.

Parameters:

connectionService - The service to use to create the monitoring connection.

telemetryFactory - The telemetry factory to use to create telemetry data.

hostSpec - The HostSpec of the server this HostMonitorImpl instance is monitoring.

properties - The Properties containing additional monitoring configuration.

failureDetectionTimeMillis - A failure detection time in millis.

failureDetectionIntervalMillis - A failure detection interval in millis.

failureDetectionCount - A failure detection count.

abortedConnectionsCounter - Aborted connection telemetry counter.

Method Detail

canDispose

public boolean canDispose()

Description copied from interface: Monitor

Defines whether this monitor can be disposed.

Specified by:

canDispose in interface HostMonitor

Specified by:

canDispose in interface Monitor

Overrides:

canDispose in class AbstractMonitor

Returns:

true if this monitor can be disposed, otherwise returns false.

start

public void start()

Description copied from interface: Monitor

Submits this monitor in a separate thread to begin its monitoring tasks.

Specified by:

start in interface Monitor

Overrides:

start in class AbstractMonitor

startMonitoring

public void startMonitoring(HostMonitorConnectionContext context)

Specified by:

startMonitoring in interface HostMonitor

newContextRun

public void newContextRun()

monitor

public void monitor()

Description copied from interface: Monitor

Executes the monitoring loop for this monitor. This method should be called in the run() method of the thread submitted during the call to Monitor.start(). Additionally, the monitoring loop should regularly update the last activity timestamp so that the MonitorService can detect whether the monitor is stuck or not.

Specified by:

monitor in interface Monitor

close

public void close()

Description copied from interface: Monitor

Closes all resources used by this monitor. This method will be called as part of Monitor.stop().

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface Monitor

Overrides:

close in class AbstractMonitor