Package com.google.cloud.spring.pubsub.core

Class PubSubTemplate

java.lang.Object

com.google.cloud.spring.pubsub.core.PubSubTemplate

All Implemented Interfaces:

PubSubPublisherOperations, PubSubOperations, PubSubSubscriberOperations

public class PubSubTemplate
extends Object
implements PubSubOperations

Default implementation of PubSubOperations.

The main Google Cloud Pub/Sub integration component for publishing to topics and consuming messages from subscriptions asynchronously or by pulling.

Constructor Summary

Constructors

Constructor	Description
PubSubTemplate(PubSubPublisherTemplate pubSubPublisherTemplate, PubSubSubscriberTemplate pubSubSubscriberTemplate)	Default PubSubTemplate constructor that uses a PubSubPublisherTemplate and a PubSubSubscriberTemplate.
PubSubTemplate(PublisherFactory publisherFactory, SubscriberFactory subscriberFactory)	Default PubSubTemplate constructor.

Method Summary

Modifier and Type	Method	Description
CompletableFuture<Void>	ack(Collection<? extends AcknowledgeablePubsubMessage> acknowledgeablePubsubMessages)	Acknowledge a batch of messages.
PubSubMessageConverter	getMessageConverter()
PublisherFactory	getPublisherFactory()
PubSubPublisherTemplate	getPubSubPublisherTemplate()
PubSubSubscriberTemplate	getPubSubSubscriberTemplate()
SubscriberFactory	getSubscriberFactory()
CompletableFuture<Void>	modifyAckDeadline(Collection<? extends AcknowledgeablePubsubMessage> acknowledgeablePubsubMessages, int ackDeadlineSeconds)	Modify the ack deadline of a batch of messages.
CompletableFuture<Void>	nack(Collection<? extends AcknowledgeablePubsubMessage> acknowledgeablePubsubMessages)	Negatively acknowledge a batch of messages.
CompletableFuture<String>	publish(String topic, com.google.pubsub.v1.PubsubMessage pubsubMessage)	Send a message to Pub/Sub.
<T> CompletableFuture<String>	publish(String topic, T payload)	Send a message to Pub/Sub.
<T> CompletableFuture<String>	publish(String topic, T payload, Map<String,String> headers)	Uses the configured message converter to first convert the payload and headers to a PubsubMessage and then publish it.
List<AcknowledgeablePubsubMessage>	pull(String subscription, Integer maxMessages, Boolean returnImmediately)	Pull a number of messages from a Google Cloud Pub/Sub subscription.
List<com.google.pubsub.v1.PubsubMessage>	pullAndAck(String subscription, Integer maxMessages, Boolean returnImmediately)	Pull and auto-acknowledge a number of messages from a Google Cloud Pub/Sub subscription.
CompletableFuture<List<com.google.pubsub.v1.PubsubMessage>>	pullAndAckAsync(String subscription, Integer maxMessages, Boolean returnImmediately)	Asynchronously pull and auto-acknowledge a number of messages from a Google Cloud Pub/Sub subscription.
<T> List<ConvertedAcknowledgeablePubsubMessage<T>>	pullAndConvert(String subscription, Integer maxMessages, Boolean returnImmediately, Class<T> payloadType)	Pull a number of messages from a Google Cloud Pub/Sub subscription and convert them to Spring messages with the desired payload type.
<T> CompletableFuture<List<ConvertedAcknowledgeablePubsubMessage<T>>>	pullAndConvertAsync(String subscription, Integer maxMessages, Boolean returnImmediately, Class<T> payloadType)	Asynchronously pull a number of messages from a Google Cloud Pub/Sub subscription and convert them to Spring messages with the desired payload type.
CompletableFuture<List<AcknowledgeablePubsubMessage>>	pullAsync(String subscription, Integer maxMessages, Boolean returnImmediately)	Asynchronously pull a number of messages from a Google Cloud Pub/Sub subscription.
com.google.pubsub.v1.PubsubMessage	pullNext(String subscription)	Pull and auto-acknowledge a message from a Google Cloud Pub/Sub subscription.
CompletableFuture<com.google.pubsub.v1.PubsubMessage>	pullNextAsync(String subscription)	Asynchronously pull and auto-acknowledge a message from a Google Cloud Pub/Sub subscription.
void	setMessageConverter(PubSubMessageConverter messageConverter)
com.google.cloud.pubsub.v1.Subscriber	subscribe(String subscription, Consumer<BasicAcknowledgeablePubsubMessage> messageConsumer)	Add a callback method to an existing subscription.
<T> com.google.cloud.pubsub.v1.Subscriber	subscribeAndConvert(String subscription, Consumer<ConvertedBasicAcknowledgeablePubsubMessage<T>> messageConsumer, Class<T> payloadType)	Add a callback method to an existing subscription that receives Pub/Sub messages converted to the requested payload type.

Methods inherited from class java.lang.Object

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

Constructor Details

PubSubTemplate

public PubSubTemplate(PublisherFactory publisherFactory,
 SubscriberFactory subscriberFactory)

Default PubSubTemplate constructor.

Parameters:

publisherFactory - the Publisher factory to publish to topics.

subscriberFactory - the Subscriber factory to subscribe to subscriptions.

PubSubTemplate

public PubSubTemplate(PubSubPublisherTemplate pubSubPublisherTemplate,
 PubSubSubscriberTemplate pubSubSubscriberTemplate)

Default PubSubTemplate constructor that uses a PubSubPublisherTemplate and a PubSubSubscriberTemplate.

Parameters:

pubSubPublisherTemplate - the PubSubPublisherTemplate to publish to topics.

pubSubSubscriberTemplate - the PubSubSubscriberTemplate to subscribe to subscriptions or pull messages

Since:

1.1

Method Details

getPubSubPublisherTemplate

public PubSubPublisherTemplate getPubSubPublisherTemplate()

getPubSubSubscriberTemplate

public PubSubSubscriberTemplate getPubSubSubscriberTemplate()

getMessageConverter

public PubSubMessageConverter getMessageConverter()

setMessageConverter

public void setMessageConverter(PubSubMessageConverter messageConverter)

publish

public <T> CompletableFuture<String> publish(String topic,
 T payload,
 Map<String,String> headers)

Uses the configured message converter to first convert the payload and headers to a PubsubMessage and then publish it.

Specified by:

publish in interface PubSubPublisherOperations

Type Parameters:

T - the type of the payload to publish

Parameters:

topic - short topic name, e.g., "topicName", or the fully-qualified topic name in the projects/[project_name]/topics/[topic_name] format

payload - an object that will be serialized and sent

headers - the headers to publish

Returns:

the listenable future of the call

publish

public <T> CompletableFuture<String> publish(String topic,
 T payload)

Description copied from interface: PubSubPublisherOperations

Send a message to Pub/Sub.

Specified by:

publish in interface PubSubPublisherOperations

Type Parameters:

T - the type of the payload to publish

Parameters:

topic - short topic name, e.g., "topicName", or the fully-qualified topic name in the projects/[project_name]/topics/[topic_name] format

payload - an object that will be serialized and sent

Returns:

the listenable future of the call

publish

public CompletableFuture<String> publish(String topic,
 com.google.pubsub.v1.PubsubMessage pubsubMessage)

Description copied from interface: PubSubPublisherOperations

Send a message to Pub/Sub.

Specified by:

publish in interface PubSubPublisherOperations

Parameters:

topic - short topic name, e.g., "topicName", or the fully-qualified topic name in the projects/[project_name]/topics/[topic_name] format

pubsubMessage - a Google Cloud Pub/Sub API message

Returns:

the listenable future of the call

subscribe

public com.google.cloud.pubsub.v1.Subscriber subscribe(String subscription,
 Consumer<BasicAcknowledgeablePubsubMessage> messageConsumer)

Description copied from interface: PubSubSubscriberOperations

Add a callback method to an existing subscription.

The created Subscriber is returned so it can be stopped.

Specified by:

subscribe in interface PubSubSubscriberOperations

Parameters:

subscription - short subscription name, e.g., "subscriptionName", or the fully-qualified subscription name in the projects/[project_name]/subscriptions/[subscription_name] format

messageConsumer - the callback method triggered when new messages arrive

Returns:

subscriber listening to new messages

subscribeAndConvert

public <T> com.google.cloud.pubsub.v1.Subscriber subscribeAndConvert(String subscription,
 Consumer<ConvertedBasicAcknowledgeablePubsubMessage<T>> messageConsumer,
 Class<T> payloadType)

Description copied from interface: PubSubSubscriberOperations

Add a callback method to an existing subscription that receives Pub/Sub messages converted to the requested payload type.

The created Subscriber is returned so it can be stopped.

Specified by:

subscribeAndConvert in interface PubSubSubscriberOperations

Type Parameters:

T - the type of the payload

Parameters:

subscription - short subscription name, e.g., "subscriptionName", or the fully-qualified subscription name in the projects/[project_name]/subscriptions/[subscription_name] format

messageConsumer - the callback method triggered when new messages arrive

payloadType - the type to which the payload of the Pub/Sub message should be converted

Returns:

subscriber listening to new messages

pull

public List<AcknowledgeablePubsubMessage> pull(String subscription,
 Integer maxMessages,
 Boolean returnImmediately)

Description copied from interface: PubSubSubscriberOperations

Pull a number of messages from a Google Cloud Pub/Sub subscription.

Specified by:

pull in interface PubSubSubscriberOperations

Parameters:

subscription - short subscription name, e.g., "subscriptionName", or the fully-qualified subscription name in the projects/[project_name]/subscriptions/[subscription_name] format

maxMessages - the maximum number of pulled messages. If this value is null then up to Integer.MAX_VALUE messages will be requested.

returnImmediately - returns immediately even if subscription doesn't contain enough messages to satisfy maxMessages. Setting this parameter to true is not recommended as it may result in long delays in message delivery.

Returns:

the list of received acknowledgeable messages

pullAsync

public CompletableFuture<List<AcknowledgeablePubsubMessage>> pullAsync(String subscription,
 Integer maxMessages,
 Boolean returnImmediately)

Description copied from interface: PubSubSubscriberOperations

Asynchronously pull a number of messages from a Google Cloud Pub/Sub subscription.

Specified by:

pullAsync in interface PubSubSubscriberOperations

Parameters:

subscription - short subscription name, e.g., "subscriptionName", or the fully-qualified subscription name in the projects/[project_name]/subscriptions/[subscription_name] format

maxMessages - the maximum number of pulled messages. If this value is null then up to Integer.MAX_VALUE messages will be requested.

returnImmediately - returns immediately even if subscription doesn't contain enough messages to satisfy maxMessages. Setting this parameter to true is not recommended as it may result in long delays in message delivery.

Returns:

the CompletableFuture for the asynchronous execution, returning the list of received acknowledgeable messages

pullAndConvert

public <T>
List<ConvertedAcknowledgeablePubsubMessage<T>> pullAndConvert(String subscription,
 Integer maxMessages,
 Boolean returnImmediately,
 Class<T> payloadType)

Description copied from interface: PubSubSubscriberOperations

Pull a number of messages from a Google Cloud Pub/Sub subscription and convert them to Spring messages with the desired payload type.

Specified by:

pullAndConvert in interface PubSubSubscriberOperations

Type Parameters:

T - the type of the payload

Parameters:

subscription - short subscription name, e.g., "subscriptionName", or the fully-qualified subscription name in the projects/[project_name]/subscriptions/[subscription_name] format

maxMessages - the maximum number of pulled messages. If this value is null then up to Integer.MAX_VALUE messages will be requested.

returnImmediately - returns immediately even if subscription doesn't contain enough messages to satisfy maxMessages. Setting this parameter to true is not recommended as it may result in long delays in message delivery.

payloadType - the type to which the payload of the Pub/Sub messages should be converted

Returns:

the list of received acknowledgeable messages

pullAndConvertAsync

public <T>
CompletableFuture<List<ConvertedAcknowledgeablePubsubMessage<T>>> pullAndConvertAsync(String subscription,
 Integer maxMessages,
 Boolean returnImmediately,
 Class<T> payloadType)

Description copied from interface: PubSubSubscriberOperations

Asynchronously pull a number of messages from a Google Cloud Pub/Sub subscription and convert them to Spring messages with the desired payload type.

Specified by:

pullAndConvertAsync in interface PubSubSubscriberOperations

Type Parameters:

T - the type of the payload

Parameters:

subscription - short subscription name, e.g., "subscriptionName", or the fully-qualified subscription name in the projects/[project_name]/subscriptions/[subscription_name] format

maxMessages - the maximum number of pulled messages. If this value is null then up to Integer.MAX_VALUE messages will be requested.

returnImmediately - returns immediately even if subscription doesn't contain enough messages to satisfy maxMessages. Setting this parameter to true is not recommended as it may result in long delays in message delivery.

payloadType - the type to which the payload of the Pub/Sub messages should be converted

Returns:

the CompletableFuture for the asynchronous execution, returning the list of received acknowledgeable messages

pullAndAck

public List<com.google.pubsub.v1.PubsubMessage> pullAndAck(String subscription,
 Integer maxMessages,
 Boolean returnImmediately)

Description copied from interface: PubSubSubscriberOperations

Pull and auto-acknowledge a number of messages from a Google Cloud Pub/Sub subscription.

Specified by:

pullAndAck in interface PubSubSubscriberOperations

Parameters:

subscription - short subscription name, e.g., "subscriptionName", or the fully-qualified subscription name in the projects/[project_name]/subscriptions/[subscription_name] format

maxMessages - the maximum number of pulled messages. If this value is null then up to Integer.MAX_VALUE messages will be requested.

returnImmediately - returns immediately even if subscription doesn't contain enough messages to satisfy maxMessages. Setting this parameter to true is not recommended as it may result in long delays in message delivery.

Returns:

the list of received messages

pullAndAckAsync

public CompletableFuture<List<com.google.pubsub.v1.PubsubMessage>> pullAndAckAsync(String subscription,
 Integer maxMessages,
 Boolean returnImmediately)

Description copied from interface: PubSubSubscriberOperations

Asynchronously pull and auto-acknowledge a number of messages from a Google Cloud Pub/Sub subscription.

Specified by:

pullAndAckAsync in interface PubSubSubscriberOperations

Parameters:

subscription - short subscription name, e.g., "subscriptionName", or the fully-qualified subscription name in the projects/[project_name]/subscriptions/[subscription_name] format

maxMessages - the maximum number of pulled messages. If this value is null then up to Integer.MAX_VALUE messages will be requested.

returnImmediately - returns immediately even if subscription doesn't contain enough messages to satisfy maxMessages. Setting this parameter to true is not recommended as it may result in long delays in message delivery.

Returns:

the CompletableFuture for the asynchronous execution, returning the list of received acknowledgeable messages

pullNext

public com.google.pubsub.v1.PubsubMessage pullNext(String subscription)

Description copied from interface: PubSubSubscriberOperations

Pull and auto-acknowledge a message from a Google Cloud Pub/Sub subscription.

Specified by:

pullNext in interface PubSubSubscriberOperations

Parameters:

subscription - short subscription name, e.g., "subscriptionName", or the fully-qualified subscription name in the projects/[project_name]/subscriptions/[subscription_name] format

Returns:

a received message, or null if none exists in the subscription

pullNextAsync

public CompletableFuture<com.google.pubsub.v1.PubsubMessage> pullNextAsync(String subscription)

Description copied from interface: PubSubSubscriberOperations

Asynchronously pull and auto-acknowledge a message from a Google Cloud Pub/Sub subscription.

Specified by:

pullNextAsync in interface PubSubSubscriberOperations

Parameters:

subscription - short subscription name, e.g., "subscriptionName", or the fully-qualified subscription name in the projects/[project_name]/subscriptions/[subscription_name] format

Returns:

the CompletableFuture for the asynchronous execution, returning a received message, or null if none exists in the subscription

ack

public CompletableFuture<Void> ack(Collection<? extends AcknowledgeablePubsubMessage> acknowledgeablePubsubMessages)

Description copied from interface: PubSubSubscriberOperations

Acknowledge a batch of messages. The messages must have the same project id.

Specified by:

ack in interface PubSubSubscriberOperations

Parameters:

acknowledgeablePubsubMessages - messages to be acknowledged

Returns:

CompletableFuture<Void> the CompletableFuture for the asynchronous execution

nack

public CompletableFuture<Void> nack(Collection<? extends AcknowledgeablePubsubMessage> acknowledgeablePubsubMessages)

Description copied from interface: PubSubSubscriberOperations

Negatively acknowledge a batch of messages. The messages must have the same project id.

Specified by:

nack in interface PubSubSubscriberOperations

Parameters:

acknowledgeablePubsubMessages - messages to be negatively acknowledged

Returns:

CompletableFuture<Void> the CompletableFuture for the asynchronous execution

modifyAckDeadline

public CompletableFuture<Void> modifyAckDeadline(Collection<? extends AcknowledgeablePubsubMessage> acknowledgeablePubsubMessages,
 int ackDeadlineSeconds)

Description copied from interface: PubSubSubscriberOperations

Modify the ack deadline of a batch of messages. The messages must have the same project id.

Specified by:

modifyAckDeadline in interface PubSubSubscriberOperations

Parameters:

acknowledgeablePubsubMessages - messages to be modified

ackDeadlineSeconds - the new ack deadline in seconds. A deadline of 0 effectively nacks the messages.

Returns:

CompletableFuture<Void> the CompletableFuture for the asynchronous execution

getPublisherFactory

public PublisherFactory getPublisherFactory()

getSubscriberFactory

public SubscriberFactory getSubscriberFactory()