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com.tangosol.net
Class GuardSupport.Context

java.lang.Object
com.tangosol.net.GuardSupport.Context

All Implemented Interfaces:

Guardian.GuardContext

Enclosing class:

GuardSupport

protected class GuardSupport.Context

extends Object

implements Guardian.GuardContext

Base implementation for GuardContext's used by GuardSupport.

Field Summary

protected long	m_cRecoveryMillis The amount of time to allow for recovery
protected long	m_cSoftTimeoutMillis The soft-timeout interval to use for the represented Guardable.
protected long	m_cTimeoutMillis The timeout interval to use for the represented Guardable.
protected boolean	m_fHeartbeatDefault Was the last heartbeat issued on this context for the default interval?
protected float	m_flPctRecover Percentage of the timeout after which to attempt recovery of the Guardable.
protected Guardable	m_guardable The Guardable represented by this GuardContext
protected long	m_ldtLastMissedSoftTimeout The soft-timeout stamp that was violated, resulting in a recovery attempt.
protected long	m_ldtSoftTimeout The next soft-timeout for the Guardable
protected long	m_ldtTimeout The next timeout for the Guardable.
protected int	m_nState The current state of the Context.

Fields inherited from interface com.tangosol.net.Guardian.GuardContext

STATE_HEALTHY, STATE_RECOVERY, STATE_TERMINATING

Constructor Summary

protected

GuardSupport.Context(Guardable guardable, long cTimeoutMillis, float flPctRecover) Construct a Context.

Method Summary

Guardable	getGuardable() Return the Guardable for this context.
Guardian	getGuardian() Return the Guardian for this context.
protected long	getMissedSoftTimeout() Return the last missed soft-timeout for this Guardable (that resulted in a recovery attempt).
protected long	getRecoveryMillis() Return the recovery interval for this Guardable.
protected long	getSoftTimeout() Return the next soft-timeout for this Guardable.
long	getSoftTimeoutMillis() Return the soft timeout interval for the represented Guardable.
int	getState() Return the state of the Guardable.
protected long	getTimeout() Return the next timeout for this Guardable.
void	heartbeat() Called by the Guardable to signal that it is still alive.
void	heartbeat(long cMillis) Called by the Guardable to signal that it is still alive, and that it should not be considered timed out for the specified number of milliseconds.
protected boolean	isSuspect(long ldtNow) Is the Guardable represented by this GuardContext suspect (in danger of timing out soon).
protected boolean	isTimedOut(long ldtNow) Is the Guardable represented by this GuardContext timed out?
protected void	onRecovery() Called when the guardable enters the "RECOVERY" state.
protected void	onTerminate() Called when the guardable enters the "TERMINATING" state.
void	release() Release this context, causing the Guardian to discontinue monitoring of the represented Guardable.
protected void	setMissedSoftTimeout(long ldtSoftTimeout) Set the missed soft-timeout for this guardable.
protected void	setRecoveryMillis(long cRecoveryMillis) Set the recovery interval for this Guardable.
protected void	setSoftTimeout(long ldtSoftTimeout) Set the next soft-timeout for this Guardable.
protected void	setState(int nState) Set the state of the GuardContext to the specified value.
protected void	setTimeout(long ldtTimeout) Set the next timeout for this Guardable.
String	toString() Return a human-readable description.

Field Detail

m_nState

protected volatile int m_nState

The current state of the Context.

m_fHeartbeatDefault

protected boolean m_fHeartbeatDefault

Was the last heartbeat issued on this context for the default interval? This property is only used by the guarded thread.

m_ldtTimeout

protected long m_ldtTimeout

The next timeout for the Guardable. This property is only used by the guardian thread.

m_cRecoveryMillis

protected volatile long m_cRecoveryMillis

The amount of time to allow for recovery

m_ldtSoftTimeout

protected volatile long m_ldtSoftTimeout

The next soft-timeout for the Guardable

m_guardable

protected Guardable m_guardable

The Guardable represented by this GuardContext

m_cTimeoutMillis

protected long m_cTimeoutMillis

The timeout interval to use for the represented Guardable.

m_cSoftTimeoutMillis

protected long m_cSoftTimeoutMillis

The soft-timeout interval to use for the represented Guardable.

m_ldtLastMissedSoftTimeout

protected long m_ldtLastMissedSoftTimeout

The soft-timeout stamp that was violated, resulting in a recovery attempt.

m_flPctRecover

protected float m_flPctRecover

Percentage of the timeout after which to attempt recovery of the Guardable.

Constructor Detail

GuardSupport.Context

protected GuardSupport.Context(Guardable guardable,
                               long cTimeoutMillis,
                               float flPctRecover)

Construct a Context.

Parameters:

guardable - the guardable represented by this Context

cTimeoutMillis - the timeout interval for the specified Guardable

flPctRecover - the percentage of the timeout after which to attempt recovery of the Guardable; 0 < flPctRecover &lteq; 1.0

Method Detail

setState

protected void setState(int nState)

Set the state of the GuardContext to the specified value.

Parameters:

nState - the state to set this GuardContext to

getTimeout

protected long getTimeout()

Return the next timeout for this Guardable.

Returns:

the next timestamp, after which this Guardable should be considered timed out

setTimeout

protected void setTimeout(long ldtTimeout)

Set the next timeout for this Guardable.

Parameters:

ldtTimeout - the next timestamp, after which this Guardable should be considered timed out

getSoftTimeout

protected long getSoftTimeout()

Return the next soft-timeout for this Guardable. The soft-timeout is used to determine when to attempt recovery of the Guardable.

Returns:

the next timestamp, after which this Guardable should be considered suspect, and recovery attempted

setSoftTimeout

protected void setSoftTimeout(long ldtSoftTimeout)

Set the next soft-timeout for this Guardable.

Parameters:

ldtSoftTimeout - the next timestamp, after which this Guardable should be considered suspect, and recovery attempted

getRecoveryMillis

protected long getRecoveryMillis()

Return the recovery interval for this Guardable.

Returns:

the recovery interval for this Guardable

setRecoveryMillis

protected void setRecoveryMillis(long cRecoveryMillis)

Set the recovery interval for this Guardable.

Parameters:

cRecoveryMillis - the recovery interval for this Guardable

getMissedSoftTimeout

protected long getMissedSoftTimeout()

Return the last missed soft-timeout for this Guardable (that resulted in a recovery attempt).

Returns:

the last missed soft-timeout for this guardable

setMissedSoftTimeout

protected void setMissedSoftTimeout(long ldtSoftTimeout)

Set the missed soft-timeout for this guardable.

Parameters:

ldtSoftTimeout - the soft-timeout that was missed

isTimedOut

protected boolean isTimedOut(long ldtNow)

Is the Guardable represented by this GuardContext timed out?

Parameters:

ldtNow - the current timestamp

Returns:

true iff the represented Guardable is timed out

isSuspect

protected boolean isSuspect(long ldtNow)

Is the Guardable represented by this GuardContext suspect (in danger of timing out soon).

Parameters:

ldtNow - the current timestamp

Returns:

true iff the represented Guardable is suspect

toString

public String toString()

Return a human-readable description.

Returns:

a human-readable description

getGuardian

public Guardian getGuardian()

Return the Guardian for this context.

Specified by:

getGuardian in interface Guardian.GuardContext

Returns:

the Guardian for this context

getGuardable

public Guardable getGuardable()

Return the Guardable for this context.

Specified by:

getGuardable in interface Guardian.GuardContext

Returns:

the Guardable for this context

heartbeat

public void heartbeat()

Called by the Guardable to signal that it is still alive.

Specified by:

heartbeat in interface Guardian.GuardContext

heartbeat

public void heartbeat(long cMillis)

Called by the Guardable to signal that it is still alive, and that it should not be considered timed out for the specified number of milliseconds.

Specified by:

heartbeat in interface Guardian.GuardContext

Parameters:

cMillis - the number of milliseconds for which the guardable should not be considered timed out

getState

public int getState()

Return the state of the Guardable. Valid values are STATE_* constants.

Specified by:

getState in interface Guardian.GuardContext

Returns:

the state of the Guardable

release

public void release()

Release this context, causing the Guardian to discontinue monitoring of the represented Guardable.

Specified by:

release in interface Guardian.GuardContext

getSoftTimeoutMillis

public long getSoftTimeoutMillis()

Return the soft timeout interval for the represented Guardable. <p/> The soft timeout interval is the amount of time that must pass after the last received heartbeat before a recovery attempt is made.

Specified by:

getSoftTimeoutMillis in interface Guardian.GuardContext

Returns:

the soft timeout interval for the represented Guardable

onRecovery

protected void onRecovery()

Called when the guardable enters the "RECOVERY" state.

onTerminate

protected void onTerminate()

Called when the guardable enters the "TERMINATING" state.

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