org.apache.jena.atlas.data

Class ThresholdPolicyMemory<T>

java.lang.Object

org.apache.jena.atlas.data.ThresholdPolicyMemory<T>

All Implemented Interfaces:

ThresholdPolicy<T>

public class ThresholdPolicyMemory<T>
extends Object
implements ThresholdPolicy<T>

A threshold policy based on the estimated memory size of the tuples added.

TODO This policy isn't ready to be used because the SerializationFactorys don't support generating memory estimates yet.

TODO It might be too expensive to examine each tuple individually. We could change it to sample the first 100 tuples to calculate an average tuple size.

Constructor Summary

Constructors

Constructor and Description
ThresholdPolicyMemory(long threshold, SerializationFactory<T> serializerFactory)

Method Summary

Methods

Modifier and Type	Method and Description
long	getCount() Returns the current count of the number of items incremented in this policy.
long	getMemorySize() Returns the current total estimated memory size of all the items incremented in this policy.
long	getThreshold() Returns the threshold before the list is written to disk.
void	increment(T item) Call this method each time to increment the policy's threshold count.
boolean	isThresholdExceeded() Determines whether or not the configured threshold has been exceeded for this policy.
void	reset() Reset the policy back to the initial state.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ThresholdPolicyMemory

public ThresholdPolicyMemory(long threshold,
                     SerializationFactory<T> serializerFactory)

Method Detail

increment

public void increment(T item)

Description copied from interface: ThresholdPolicy

Call this method each time to increment the policy's threshold count.

Specified by:

increment in interface ThresholdPolicy<T>

Parameters:

item - The item that was added.

isThresholdExceeded

public boolean isThresholdExceeded()

Description copied from interface: ThresholdPolicy

Determines whether or not the configured threshold has been exceeded for this policy.

Specified by:

isThresholdExceeded in interface ThresholdPolicy<T>

Returns:

true if the threshold has been reached; false otherwise.

reset

public void reset()

Description copied from interface: ThresholdPolicy

Reset the policy back to the initial state.

Specified by:

reset in interface ThresholdPolicy<T>

getThreshold

public long getThreshold()

Returns the threshold before the list is written to disk.

Returns:

The threshold point.

getCount

public long getCount()

Returns the current count of the number of items incremented in this policy.

Returns:

The item count.

getMemorySize

public long getMemorySize()

Returns the current total estimated memory size of all the items incremented in this policy.

Returns:

The item count.

toString

public String toString()

Overrides:

toString in class Object