com.feedzai.commons.sql.abstraction.listeners.impl

Class NoopMetricsListener

java.lang.Object

com.feedzai.commons.sql.abstraction.listeners.impl.NoopMetricsListener

All Implemented Interfaces:

MetricsListener, AutoCloseable

public class NoopMetricsListener
extends Object
implements MetricsListener

A NoopMetricsListener that does nothing on the callbacks.

Author:

José Fidalgo (jose.fidalgo@feedzai.com)

Field Summary

Fields

Modifier and Type	Field and Description
static NoopMetricsListener	INSTANCE A singleton instance of this class.

Constructor Summary

Constructors

Constructor and Description
NoopMetricsListener()

Method Summary

Modifier and Type	Method and Description
void	onEntryAdded() Called when an entry is added to the batch.
void	onFlushFinished(long elapsed, int successfulEntriesCount, int failedEntriesCount) Called when a batch flush is finished.
void	onFlushStarted(long elapsed, int flushEntriesCount) Called when a batch flush is not empty and starts the process to persist entries in the database, eventually after waiting for other flush operations to finish.
void	onFlushTriggered() Called when a batch flush is triggered.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.feedzai.commons.sql.abstraction.listeners.MetricsListener

close

Field Detail

INSTANCE

public static final NoopMetricsListener INSTANCE

A singleton instance of this class.

Constructor Detail

NoopMetricsListener

public NoopMetricsListener()

Method Detail

onEntryAdded

public void onEntryAdded()

Description copied from interface: MetricsListener

Called when an entry is added to the batch.

Specified by:

onEntryAdded in interface MetricsListener

onFlushTriggered

public void onFlushTriggered()

Description copied from interface: MetricsListener

Called when a batch flush is triggered.

The batch may be empty, in which case it will skip the persistence to database.

Specified by:

onFlushTriggered in interface MetricsListener

onFlushStarted

public void onFlushStarted(long elapsed,
                           int flushEntriesCount)

Description copied from interface: MetricsListener

Called when a batch flush is not empty and starts the process to persist entries in the database, eventually after waiting for other flush operations to finish.

Specified by:

onFlushStarted in interface MetricsListener

Parameters:

elapsed - The time elapsed (in milliseconds) since the batch flush was triggered.

flushEntriesCount - The number of entries to be flushed.

onFlushFinished

public void onFlushFinished(long elapsed,
                            int successfulEntriesCount,
                            int failedEntriesCount)

Description copied from interface: MetricsListener

Called when a batch flush is finished.

This should be called for all cases:

• flush finished immediately because it was empty
• flush was rejected due to executor capacity constraints
• flush finished after all entries were sent to the database (either all or some succeeded, or all failed)

Specified by:

onFlushFinished in interface MetricsListener

Parameters:

elapsed - The time elapsed (in milliseconds) since the batch flush was triggered.

successfulEntriesCount - The number of entries flushed successfully.

failedEntriesCount - The number of entries that failed to be flushed.