ConnectionActivityMonitor (Jenkins core 2.454 API)

java.lang.Object
- java.util.TimerTask
- - hudson.triggers.SafeTimerTask
  - - hudson.model.PeriodicWork
    - - hudson.model.AsyncPeriodicWork
      - hudson.slaves.ConnectionActivityMonitor

All Implemented Interfaces:

ExtensionPoint, Runnable
```
@Extension
@Symbol("connectionActivityMonitor")
public class ConnectionActivityMonitor
extends AsyncPeriodicWork
```
Makes sure that connections to agents are alive, and if they are not, cut them off.
If we only rely on TCP retransmission time out for this, the time it takes to detect a bad connection is in the order of 10s of minutes, so we take the matters to our own hands.

Since:

1.325

Author:

Kohsuke Kawaguchi

Nested Class Summary
- Nested classes/interfaces inherited from class hudson.triggers.SafeTimerTask
  SafeTimerTask.ExceptionRunnable
- Nested classes/interfaces inherited from interface hudson.ExtensionPoint
  ExtensionPoint.LegacyInstancesAreScopedToHudson

Field Summary

Fields
Modifier and Type Field Description

boolean enabled
- Fields inherited from class hudson.model.AsyncPeriodicWork
  name
- Fields inherited from class hudson.model.PeriodicWork
  DAY, HOUR, logger, MIN

Constructor Summary

Constructors
Constructor Description

ConnectionActivityMonitor()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`execute(TaskListener listener)`	Executes the task.
`long`	`getRecurrencePeriod()`	Gets the number of milliseconds between successive executions.

Methods inherited from class hudson.model.AsyncPeriodicWork
createListener, doRun, getErrorLoggingLevel, getLogFile, getNormalLoggingLevel, getSlowLoggingLevel

Methods inherited from class hudson.model.PeriodicWork
all, getInitialDelay, init

Methods inherited from class hudson.triggers.SafeTimerTask
getLogsRoot, of, run

Methods inherited from class java.util.TimerTask
cancel, scheduledExecutionTime

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - enabled
```
public boolean enabled
```
- Constructor Detail
  - ConnectionActivityMonitor
```
public ConnectionActivityMonitor()
```
- Method Detail
  - execute
```
protected void execute(TaskListener listener)
                throws IOException,
                       InterruptedException
```
    Description copied from class: AsyncPeriodicWork
    
    Executes the task.
    
    Specified by:
    
    execute in class AsyncPeriodicWork
    
    Parameters:
    
    listener - Output sent will be reported to the users. (this work is TBD.)
    
    Throws:
    
    IOException - The caller will record the exception and moves on.
    
    InterruptedException - The caller will record the exception and moves on.
  - getRecurrencePeriod
```
public long getRecurrencePeriod()
```
    Description copied from class: PeriodicWork
    
    Gets the number of milliseconds between successive executions.
    Hudson calls this method once to set up a recurring timer, instead of calling this each time after the previous execution completed. So this class cannot be used to implement a non-regular recurring timer.
    IOW, the method should always return the same value.
    
    Specified by:
    
    getRecurrencePeriod in class PeriodicWork