alma.ACS.MasterComponentImpl

Class SubsysResourceMonitor

java.lang.Object

alma.ACS.MasterComponentImpl.SubsysResourceMonitor

public class SubsysResourceMonitor
extends java.lang.Object

Monitor for any kind of resource whose state a subsystem master component wants to observe.

This class is used by MasterComponentImplBase and should not be exposed to subsystem developers directly. However, the contained interfaces SubsysResourceMonitor.ResourceChecker and SubsysResourceMonitor.ResourceErrorHandler can be implemented by master components to supply customized checkers and error handlers for various resource types and error recovery strategies.

Since:

ACS 6.0

Author:

hsommer

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SubsysResourceMonitor.ComponentChecker<T extends ACSComponent> Implementation of ResourceChecker for ACS components.
static class	SubsysResourceMonitor.PingableResourceChecker<T extends PingableResourceOperations> A custom ResourceChecker for objects implementing PingableResource interface.
static interface	SubsysResourceMonitor.ResourceChecker<T> Encapsulates the details of a particular resource, so that all resources (components, offshoots, databases, ...) can be monitored in the same way.
static interface	SubsysResourceMonitor.ResourceErrorHandler<T> Error handler that gets notified when a monitored resource becomes unavailable or degraded.

Field Summary

Fields

Modifier and Type	Field and Description
int	defaultDelaySeconds The delay between two monitoring calls to resource.

Method Summary

Modifier and Type	Method and Description
int	getNumberOfMonitorTasks() For testing only.
void	resume() Resumes monitoring of all resources.
void	stopMonitoring(java.lang.String resourceName) Stops monitoring a given resource.
void	stopMonitoringAll() Stops monitoring all resources.
void	suspend() Suspends monitoring of all resources until resume() is called.

Methods inherited from class java.lang.Object

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

Field Detail

defaultDelaySeconds

public final int defaultDelaySeconds

The delay between two monitoring calls to resource.

Method Detail

getNumberOfMonitorTasks

public int getNumberOfMonitorTasks()

For testing only. Returns the number of actively running threads, plus the number of tasks in the queue that is used for scheduling the monitoring calls.

suspend

public void suspend()

Suspends monitoring of all resources until resume() is called. Currently running monitor calls do not get stopped, only future calls are prevented.

Note that the monitoring queue remains intact, while the monitor call itself becomes a no-op.

resume

public void resume()

Resumes monitoring of all resources.

This method has no effect if monitoring has not been previously suspended.

See Also:

suspend()

stopMonitoring

public void stopMonitoring(java.lang.String resourceName)

Stops monitoring a given resource.

Parameters:

resourceName - unique resource name

stopMonitoringAll

public void stopMonitoringAll()

Stops monitoring all resources.