org.ow2.chameleon.core.services

Class AbstractStabilityChecker

java.lang.Object

org.ow2.chameleon.core.services.AbstractStabilityChecker

All Implemented Interfaces:

StabilityChecker

Direct Known Subclasses:

BundleStabilityChecker, IPojoProcessingStabilityChecker, ServiceStabilityChecker

public abstract class AbstractStabilityChecker
extends Object
implements StabilityChecker

Provides useful method to ease the implementation of StabilityChecker.

Field Summary

Fields

Modifier and Type	Field and Description
static String	STABILITY_ATTEMPTS The system property to configure the default number of attempt before giving up.
static String	STABILITY_GRACE The system property to configure the default grace time in milliseconds.
static String	TIME_FACTOR The time factory system property.

Constructor Summary

Constructors

Constructor and Description
AbstractStabilityChecker()

Method Summary

Modifier and Type	Method and Description
static long	getDefaultGracePeriodInMillis() Retrieves the default grace period (in millis).
static int	getDefaultNumberOfAttempts() Retrieves the default number of attempts before declaring that the stability cannot be reached.
static int	getTimeFactor() Retrieves the current time factor if set.
static void	grace() Block the caller thread for the default grace period.
static void	grace(long amount, TimeUnit unit) Waits for the given time period.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.ow2.chameleon.core.services.StabilityChecker

check, getName, getPriority

Field Detail

TIME_FACTOR

public static final String TIME_FACTOR

The time factory system property.

See Also:

Constant Field Values

STABILITY_GRACE

public static final String STABILITY_GRACE

The system property to configure the default grace time in milliseconds.

See Also:

Constant Field Values

STABILITY_ATTEMPTS

public static final String STABILITY_ATTEMPTS

The system property to configure the default number of attempt before giving up.

See Also:

Constant Field Values

Constructor Detail

AbstractStabilityChecker

public AbstractStabilityChecker()

Method Detail

getTimeFactor

public static int getTimeFactor()

Retrieves the current time factor if set. The time factor is configure using the `time.factor` system property.

Returns:

the time factor, 1 if not set.

getDefaultGracePeriodInMillis

public static long getDefaultGracePeriodInMillis()

Retrieves the default grace period (in millis). The default value is set using the `stability.grace` system property. the default value is 100 ms.

Returns:

the default grace period.

getDefaultNumberOfAttempts

public static int getDefaultNumberOfAttempts()

Retrieves the default number of attempts before declaring that the stability cannot be reached. The default value is set using the `stability.attempts` system property. the default value is 500.

Returns:

the default number of attempts.

grace

public static void grace()

Block the caller thread for the default grace period.

grace

public static void grace(long amount,
                         TimeUnit unit)

Waits for the given time period.

Parameters:

amount - the amount

unit - the unit