Package org.springframework.pulsar.core

Class CachingPulsarProducerFactory<T>

java.lang.Object

org.springframework.pulsar.core.DefaultPulsarProducerFactory<T>

org.springframework.pulsar.core.CachingPulsarProducerFactory<T>

Type Parameters:

T - producer type.

All Implemented Interfaces:

DisposableBean, Lifecycle, Phased, SmartLifecycle, PulsarProducerFactory<T>

public class CachingPulsarProducerFactory<T>
extends DefaultPulsarProducerFactory<T>

A PulsarProducerFactory that extends the default implementation by caching the created producers.

The created producer is wrapped in a proxy so that calls to Producer.close() do not actually close it. The actual close occurs when the producer is evicted from the cache or when DisposableBean.destroy() is invoked.

The proxied producer is cached in an LRU fashion and evicted when it has not been used within a configured time period.

Author:

Chris Bono, Alexander Preuß, Christophe Bornet

Field Summary

Fields inherited from interface org.springframework.context.SmartLifecycle

DEFAULT_PHASE

Constructor Summary

Constructors

Constructor	Description
CachingPulsarProducerFactory(org.apache.pulsar.client.api.PulsarClient pulsarClient, String defaultTopic, List<ProducerBuilderCustomizer<T>> defaultConfigCustomizers, TopicResolver topicResolver, Duration cacheExpireAfterAccess, Long cacheMaximumSize, Integer cacheInitialCapacity)	Construct a caching producer factory with the specified values for the cache configuration.

Method Summary

Modifier and Type	Method	Description
AtomicReference<org.springframework.pulsar.core.RestartableComponentSupport.State>	currentState()
default void	destroy()
protected org.apache.pulsar.client.api.Producer<T>	doCreateProducer(org.apache.pulsar.client.api.Schema<T> schema, String topic, Collection<String> encryptionKeys, List<ProducerBuilderCustomizer<T>> customizers)	Create the actual producer.
default void	doStart()	Callback invoked during startup - default implementation does nothing.
void	doStop()
int	getPhase()	Return the phase that this lifecycle object is supposed to run in.
default boolean	isRunning()
LogAccessor	logger()
default void	start()
default void	stop()

Methods inherited from class org.springframework.pulsar.core.DefaultPulsarProducerFactory

createProducer, createProducer, createProducer, getDefaultTopic, getPulsarClient, resolveTopicName

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.context.SmartLifecycle

isAutoStartup, stop

Constructor Details

CachingPulsarProducerFactory

public CachingPulsarProducerFactory(org.apache.pulsar.client.api.PulsarClient pulsarClient,
 @Nullable
 String defaultTopic,
 List<ProducerBuilderCustomizer<T>> defaultConfigCustomizers,
 TopicResolver topicResolver,
 Duration cacheExpireAfterAccess,
 Long cacheMaximumSize,
 Integer cacheInitialCapacity)

Construct a caching producer factory with the specified values for the cache configuration.

Parameters:

pulsarClient - the client used to create the producers

defaultTopic - the default topic to use for the producers

defaultConfigCustomizers - the optional list of customizers to apply to the created producers

topicResolver - the topic resolver to use

cacheExpireAfterAccess - time period to expire unused entries in the cache

cacheMaximumSize - maximum size of cache (entries)

cacheInitialCapacity - the initial size of cache

Method Details

doCreateProducer

protected org.apache.pulsar.client.api.Producer<T> doCreateProducer(org.apache.pulsar.client.api.Schema<T> schema,
 @Nullable
 String topic,
 @Nullable
 Collection<String> encryptionKeys,
 @Nullable
 List<ProducerBuilderCustomizer<T>> customizers)

Description copied from class: DefaultPulsarProducerFactory

Create the actual producer.

Overrides:

doCreateProducer in class DefaultPulsarProducerFactory<T>

Parameters:

schema - the schema of the messages to be sent

topic - the topic the producer will send messages to or null to use the default topic

encryptionKeys - the encryption keys used by the producer, replacing the default encryption keys or null to use the default encryption keys. Beware that ProducerBuilder only has ProducerBuilder.addEncryptionKey(java.lang.String) and doesn't have methods to replace the encryption keys.

customizers - the optional list of customizers to apply to the producer builder

Returns:

the created producer

getPhase

public int getPhase()

Return the phase that this lifecycle object is supposed to run in.

Because this object depends on the restartable client, it uses a phase slightly larger than the one used by the restartable client. This ensures that it starts after and stops before the restartable client.

Specified by:

getPhase in interface Phased

Specified by:

getPhase in interface SmartLifecycle

Returns:

the phase to execute in (just after the restartable client)

See Also:

• SmartLifecycle.getPhase()

currentState

public AtomicReference<org.springframework.pulsar.core.RestartableComponentSupport.State> currentState()

logger

public LogAccessor logger()

doStop

public void doStop()

isRunning

default boolean isRunning()

Specified by:

isRunning in interface Lifecycle

start

default void start()

Specified by:

start in interface Lifecycle

doStart

default void doStart()

Callback invoked during startup - default implementation does nothing.

stop

default void stop()

Specified by:

stop in interface Lifecycle

destroy

default void destroy()

Specified by:

destroy in interface DisposableBean