Class Subscriber.Builder (1.143.0)

Builder of Subscribers.

Inheritance

Inherited Members

Returns the default FlowControlSettings used by the client if settings are not provided.

ChannelProvider to use to create Channels, which must point at Cloud Pub/Sub endpoint.

For performance, this client benefits from having multiple channels open at once. Users are encouraged to provide instances of ChannelProvider that creates new channels instead of returning pre-initialized ones.

CredentialsProvider to use to create Credentials to authenticate calls.

Gives the ability to enable Open Telemetry Tracing

Gives the ability to override the gRPC endpoint.

Gives the ability to set a custom executor. ExecutorProvider#getExecutor() will be called Builder#parallelPullCount times.

Sets the flow control settings.

In the example below, the Subscriber will make sure that

• there are at most ten thousand outstanding messages, and
• the combined size of outstanding messages does not exceed 1GB.

"Outstanding messages" here means the messages that have already been given to MessageReceiver but not yet acked() or nacked().

FlowControlSettingsflowControlSettings=
FlowControlSettings.newBuilder()
.setMaxOutstandingElementCount(10_000L)
.setMaxOutstandingRequestBytes(1_000_000_000L)
.build();
Subscribersubscriber=
Subscriber.newBuilder(subscriptionName,receiver)
.setFlowControlSettings(flowControlSettings)
.build();

Sets the static header provider. The header provider will be called during client construction only once. The headers returned by the provider will be cached and supplied as is for each request issued by the constructed client. Some reserved headers can be overridden (e.g. Content-Type) or merged with the default value (e.g. User-Agent) by the underlying transport layer.

This method is obsolete. Use #setMaxAckExtensionPeriodDuration(java.time.Duration) instead.

Set the maximum period a message ack deadline will be extended. Defaults to one hour.

It is recommended to set this value to a reasonable upper bound of the subscriber time to process any message. This maximum period avoids messages to be locked by a subscriber in cases when the ack reply is lost.

A zero duration effectively disables auto deadline extensions.

This method is obsolete. Use #setMaxDurationPerAckExtensionDuration(java.time.Duration) instead.

Set the upper bound for a single mod ack extention period.

The ack deadline will continue to be extended by up to this duration until MaxAckExtensionPeriod is reached. Setting MaxDurationPerAckExtension bounds the maximum amount of time before a mesage re-delivery in the event the Subscriber fails to extend the deadline.

MaxDurationPerAckExtension configuration can be disabled by specifying a zero duration.

This method is obsolete. Use #setMinDurationPerAckExtensionDuration(java.time.Duration) instead.

Set the lower bound for a single mod ack extention period.

The ack deadline will continue to be extended by up to this duration until MinAckExtensionPeriod is reached. Setting MinDurationPerAckExtension bounds the minimum amount of time before a mesage re-delivery in the event the Subscriber fails to extend the deadline.

MinDurationPerAckExtension configuration can be disabled by specifying a zero duration.

Sets the instance of OpenTelemetry for the Publisher class.

Sets the number of StreamingPull streams to pull messages from the subscription. Defaults to one.

Sets the shutdown settings for the subscriber. Defaults to default settings.

Gives the ability to set a custom executor for managing lease extensions. If none is provided a shared one will be used by all Subscriber instances.

Gives the ability to override the universe domain.

Disables enforcing flow control settings at the Cloud PubSub server and uses the less accurate method of only enforcing flow control at the client side.