Cloud PubSub V1 Client - Class Subscription (1.50.0)

Reference documentation and code samples for the Cloud PubSub V1 Client class Subscription.

A subscription resource. If none of push_config, bigquery_config, or cloud_storage_config is set, then the subscriber will pull and ack messages using API methods. At most one of these fields may be set.

Generated from protobuf message google.pubsub.v1.Subscription

Namespace

Google \ Cloud \ PubSub \ V1

Methods

__construct

Constructor.

Parameters
Name	Description
`data`	`array` Optional. Data for populating the Message object.
`↳ name`	`string` Required. The name of the subscription. It must have the format `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must start with a letter, and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent signs (`%`). It must be between 3 and 255 characters in length, and it must not start with `"goog"`.
`↳ topic`	`string` Required. The name of the topic from which this subscription is receiving messages. Format is `projects/{project}/topics/{topic}`. The value of this field will be `_deleted-topic_` if the topic has been deleted.
`↳ push_config`	`Google\Cloud\PubSub\V1\PushConfig` If push delivery is used with this subscription, this field is used to configure it.
`↳ bigquery_config`	`Google\Cloud\PubSub\V1\BigQueryConfig` If delivery to BigQuery is used with this subscription, this field is used to configure it.
`↳ cloud_storage_config`	`Google\Cloud\PubSub\V1\CloudStorageConfig` If delivery to Google Cloud Storage is used with this subscription, this field is used to configure it.
`↳ ack_deadline_seconds`	`int` The approximate amount of time (on a best-effort basis) Pub/Sub waits for the subscriber to acknowledge receipt before resending the message. In the interval after the message is delivered and before it is acknowledged, it is considered to be outstanding. During that time period, the message will not be redelivered (on a best-effort basis). For pull subscriptions, this value is used as the initial value for the ack deadline. To override this value for a given message, call `ModifyAckDeadline` with the corresponding `ack_id` if using non-streaming pull or send the `ack_id` in a `StreamingModifyAckDeadlineRequest` if using streaming pull. The minimum custom deadline you can specify is 10 seconds. The maximum custom deadline you can specify is 600 seconds (10 minutes). If this parameter is 0, a default value of 10 seconds is used. For push delivery, this value is also used to set the request timeout for the call to the push endpoint. If the subscriber never acknowledges the message, the Pub/Sub system will eventually redeliver the message.
`↳ retain_acked_messages`	`bool` Indicates whether to retain acknowledged messages. If true, then messages are not expunged from the subscription's backlog, even if they are acknowledged, until they fall out of the `message_retention_duration` window. This must be true if you would like to `Seek` to a timestamp in the past to replay previously-acknowledged messages.
`↳ message_retention_duration`	`Google\Protobuf\Duration` How long to retain unacknowledged messages in the subscription's backlog, from the moment a message is published. If `retain_acked_messages` is true, then this also configures the retention of acknowledged messages, and thus configures how far back in time a `Seek` can be done. Defaults to 7 days. Cannot be more than 7 days or less than 10 minutes.
`↳ labels`	`array\|Google\Protobuf\Internal\MapField` See Creating and managing labels.
`↳ enable_message_ordering`	`bool` If true, messages published with the same `ordering_key` in `PubsubMessage` will be delivered to the subscribers in the order in which they are received by the Pub/Sub system. Otherwise, they may be delivered in any order.
`↳ expiration_policy`	`Google\Cloud\PubSub\V1\ExpirationPolicy` A policy that specifies the conditions for this subscription's expiration. A subscription is considered active as long as any connected subscriber is successfully consuming messages from the subscription or is issuing operations on the subscription. If `expiration_policy` is not set, a default policy with `ttl` of 31 days will be used. The minimum allowed value for `expiration_policy.ttl` is 1 day. If `expiration_policy` is set, but `expiration_policy.ttl` is not set, the subscription never expires.
`↳ filter`	`string` An expression written in the Pub/Sub filter language. If non-empty, then only `PubsubMessage`s whose `attributes` field matches the filter are delivered on this subscription. If empty, then no messages are filtered out.
`↳ dead_letter_policy`	`Google\Cloud\PubSub\V1\DeadLetterPolicy` A policy that specifies the conditions for dead lettering messages in this subscription. If dead_letter_policy is not set, dead lettering is disabled. The Cloud Pub/Sub service account associated with this subscriptions's parent project (i.e., service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have permission to Acknowledge() messages on this subscription.
`↳ retry_policy`	`Google\Cloud\PubSub\V1\RetryPolicy` A policy that specifies how Pub/Sub retries message delivery for this subscription. If not set, the default retry policy is applied. This generally implies that messages will be retried as soon as possible for healthy subscribers. RetryPolicy will be triggered on NACKs or acknowledgement deadline exceeded events for a given message.
`↳ detached`	`bool` Indicates whether the subscription is detached from its topic. Detached subscriptions don't receive messages from their topic and don't retain any backlog. `Pull` and `StreamingPull` requests will return FAILED_PRECONDITION. If the subscription is a push subscription, pushes to the endpoint will not be made.
`↳ enable_exactly_once_delivery`	`bool` If true, Pub/Sub provides the following guarantees for the delivery of a message with a given value of `message_id` on this subscription: * The message sent to a subscriber is guaranteed not to be resent before the message's acknowledgement deadline expires. * An acknowledged message will not be resent to a subscriber. Note that subscribers may still receive multiple copies of a message when `enable_exactly_once_delivery` is true if the message was published multiple times by a publisher client. These copies are considered distinct by Pub/Sub and have distinct `message_id` values.
`↳ topic_message_retention_duration`	`Google\Protobuf\Duration` Output only. Indicates the minimum duration for which a message is retained after it is published to the subscription's topic. If this field is set, messages published to the subscription's topic in the last `topic_message_retention_duration` are always available to subscribers. See the `message_retention_duration` field in `Topic`. This field is set only in responses from the server; it is ignored if it is set in any requests.
`↳ state`	`int` Output only. An output-only field indicating whether or not the subscription can receive messages.

getName

Required. The name of the subscription. It must have the format "projects/{project}/subscriptions/{subscription}". {subscription} must start with a letter, and contain only letters ([A-Za-z]), numbers ([0-9]), dashes (-), underscores (_), periods (.), tildes (~), plus (+) or percent signs (%). It must be between 3 and 255 characters in length, and it must not start with "goog".

Returns
Type	Description
`string`

setName

Parameter
Name	Description
`var`	`string`

Returns
Type	Description
`$this`

getTopic

Required. The name of the topic from which this subscription is receiving messages. Format is projects/{project}/topics/{topic}. The value of this field will be _deleted-topic_ if the topic has been deleted.

Returns
Type	Description
`string`

setTopic

Parameter
Name	Description
`var`	`string`

Returns
Type	Description
`$this`

getPushConfig

If push delivery is used with this subscription, this field is used to configure it.

Returns
Type	Description
`Google\Cloud\PubSub\V1\PushConfig\|null`

hasPushConfig

clearPushConfig

setPushConfig

If push delivery is used with this subscription, this field is used to configure it.

Parameter
Name	Description
`var`	`Google\Cloud\PubSub\V1\PushConfig`

Returns
Type	Description
`$this`

getBigqueryConfig

If delivery to BigQuery is used with this subscription, this field is used to configure it.

Returns
Type	Description
`Google\Cloud\PubSub\V1\BigQueryConfig\|null`

hasBigqueryConfig

clearBigqueryConfig

setBigqueryConfig

If delivery to BigQuery is used with this subscription, this field is used to configure it.

Parameter
Name	Description
`var`	`Google\Cloud\PubSub\V1\BigQueryConfig`

Returns
Type	Description
`$this`

getCloudStorageConfig

If delivery to Google Cloud Storage is used with this subscription, this field is used to configure it.

Returns
Type	Description
`Google\Cloud\PubSub\V1\CloudStorageConfig\|null`

hasCloudStorageConfig

clearCloudStorageConfig

setCloudStorageConfig

If delivery to Google Cloud Storage is used with this subscription, this field is used to configure it.

Parameter
Name	Description
`var`	`Google\Cloud\PubSub\V1\CloudStorageConfig`

Returns
Type	Description
`$this`

getAckDeadlineSeconds

The approximate amount of time (on a best-effort basis) Pub/Sub waits for the subscriber to acknowledge receipt before resending the message. In the interval after the message is delivered and before it is acknowledged, it is considered to be outstanding. During that time period, the message will not be redelivered (on a best-effort basis).

For pull subscriptions, this value is used as the initial value for the ack deadline. To override this value for a given message, call ModifyAckDeadline with the corresponding ack_id if using non-streaming pull or send the ack_id in a StreamingModifyAckDeadlineRequest if using streaming pull. The minimum custom deadline you can specify is 10 seconds. The maximum custom deadline you can specify is 600 seconds (10 minutes). If this parameter is 0, a default value of 10 seconds is used. For push delivery, this value is also used to set the request timeout for the call to the push endpoint. If the subscriber never acknowledges the message, the Pub/Sub system will eventually redeliver the message.

Returns
Type	Description
`int`

setAckDeadlineSeconds

Parameter
Name	Description
`var`	`int`

Returns
Type	Description
`$this`

getRetainAckedMessages

Indicates whether to retain acknowledged messages. If true, then messages are not expunged from the subscription's backlog, even if they are acknowledged, until they fall out of the message_retention_duration window. This must be true if you would like to Seek to a timestamp in the past to replay previously-acknowledged messages.

Returns
Type	Description
`bool`

setRetainAckedMessages

Parameter
Name	Description
`var`	`bool`

Returns
Type	Description
`$this`

getMessageRetentionDuration

How long to retain unacknowledged messages in the subscription's backlog, from the moment a message is published.

If retain_acked_messages is true, then this also configures the retention of acknowledged messages, and thus configures how far back in time a Seek can be done. Defaults to 7 days. Cannot be more than 7 days or less than 10 minutes.

Returns
Type	Description
`Google\Protobuf\Duration\|null`

hasMessageRetentionDuration

clearMessageRetentionDuration

setMessageRetentionDuration

How long to retain unacknowledged messages in the subscription's backlog, from the moment a message is published.

Parameter
Name	Description
`var`	`Google\Protobuf\Duration`

Returns
Type	Description
`$this`

getLabels

See Creating and managing labels.

Returns
Type	Description
`Google\Protobuf\Internal\MapField`

setLabels

See Creating and managing labels.

Parameter
Name	Description
`var`	`array\|Google\Protobuf\Internal\MapField`

Returns
Type	Description
`$this`

getEnableMessageOrdering

If true, messages published with the same ordering_key in PubsubMessage will be delivered to the subscribers in the order in which they are received by the Pub/Sub system. Otherwise, they may be delivered in any order.

Returns
Type	Description
`bool`

setEnableMessageOrdering

Parameter
Name	Description
`var`	`bool`

Returns
Type	Description
`$this`

getExpirationPolicy

A policy that specifies the conditions for this subscription's expiration.

A subscription is considered active as long as any connected subscriber is successfully consuming messages from the subscription or is issuing operations on the subscription. If expiration_policy is not set, a default policy with ttl of 31 days will be used. The minimum allowed value for expiration_policy.ttl is 1 day. If expiration_policy is set, but expiration_policy.ttl is not set, the subscription never expires.

Returns
Type	Description
`Google\Cloud\PubSub\V1\ExpirationPolicy\|null`

hasExpirationPolicy

clearExpirationPolicy

setExpirationPolicy

A policy that specifies the conditions for this subscription's expiration.

Parameter
Name	Description
`var`	`Google\Cloud\PubSub\V1\ExpirationPolicy`

Returns
Type	Description
`$this`

getFilter

An expression written in the Pub/Sub filter language. If non-empty, then only PubsubMessages whose attributes field matches the filter are delivered on this subscription. If empty, then no messages are filtered out.

Returns
Type	Description
`string`

setFilter

Parameter
Name	Description
`var`	`string`

Returns
Type	Description
`$this`

getDeadLetterPolicy

A policy that specifies the conditions for dead lettering messages in this subscription. If dead_letter_policy is not set, dead lettering is disabled.

The Cloud Pub/Sub service account associated with this subscriptions's parent project (i.e., service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com) must have permission to Acknowledge() messages on this subscription.

Returns
Type	Description
`Google\Cloud\PubSub\V1\DeadLetterPolicy\|null`

hasDeadLetterPolicy

clearDeadLetterPolicy

setDeadLetterPolicy

A policy that specifies the conditions for dead lettering messages in this subscription. If dead_letter_policy is not set, dead lettering is disabled.

Parameter
Name	Description
`var`	`Google\Cloud\PubSub\V1\DeadLetterPolicy`

Returns
Type	Description
`$this`

getRetryPolicy

A policy that specifies how Pub/Sub retries message delivery for this subscription.

If not set, the default retry policy is applied. This generally implies that messages will be retried as soon as possible for healthy subscribers. RetryPolicy will be triggered on NACKs or acknowledgement deadline exceeded events for a given message.

Returns
Type	Description
`Google\Cloud\PubSub\V1\RetryPolicy\|null`

hasRetryPolicy

clearRetryPolicy

setRetryPolicy

A policy that specifies how Pub/Sub retries message delivery for this subscription.

Parameter
Name	Description
`var`	`Google\Cloud\PubSub\V1\RetryPolicy`

Returns
Type	Description
`$this`

getDetached

Indicates whether the subscription is detached from its topic. Detached subscriptions don't receive messages from their topic and don't retain any backlog. Pull and StreamingPull requests will return FAILED_PRECONDITION. If the subscription is a push subscription, pushes to the endpoint will not be made.

Returns
Type	Description
`bool`

setDetached

Parameter
Name	Description
`var`	`bool`

Returns
Type	Description
`$this`

getEnableExactlyOnceDelivery

If true, Pub/Sub provides the following guarantees for the delivery of a message with a given value of message_id on this subscription:

The message sent to a subscriber is guaranteed not to be resent before the message's acknowledgement deadline expires.
An acknowledged message will not be resent to a subscriber. Note that subscribers may still receive multiple copies of a message when enable_exactly_once_delivery is true if the message was published multiple times by a publisher client. These copies are considered distinct by Pub/Sub and have distinct message_id values.

Returns
Type	Description
`bool`

setEnableExactlyOnceDelivery

If true, Pub/Sub provides the following guarantees for the delivery of a message with a given value of message_id on this subscription:

The message sent to a subscriber is guaranteed not to be resent before the message's acknowledgement deadline expires.
An acknowledged message will not be resent to a subscriber. Note that subscribers may still receive multiple copies of a message when enable_exactly_once_delivery is true if the message was published multiple times by a publisher client. These copies are considered distinct by Pub/Sub and have distinct message_id values.

Parameter
Name	Description
`var`	`bool`

Returns
Type	Description
`$this`

getTopicMessageRetentionDuration

Output only. Indicates the minimum duration for which a message is retained after it is published to the subscription's topic. If this field is set, messages published to the subscription's topic in the last topic_message_retention_duration are always available to subscribers. See the message_retention_duration field in Topic. This field is set only in responses from the server; it is ignored if it is set in any requests.

Returns
Type	Description
`Google\Protobuf\Duration\|null`

hasTopicMessageRetentionDuration

clearTopicMessageRetentionDuration

setTopicMessageRetentionDuration

Parameter
Name	Description
`var`	`Google\Protobuf\Duration`

Returns
Type	Description
`$this`

getState

Output only. An output-only field indicating whether or not the subscription can receive messages.

Returns
Type	Description
`int`

setState

Output only. An output-only field indicating whether or not the subscription can receive messages.

Parameter
Name	Description
`var`	`int`

Returns
Type	Description
`$this`

static::build

Parameters
Name	Description
`name`	`string` Required. The name of the subscription. It must have the format `"projects/{project}/subscriptions/{subscription}"`. `{subscription}` must start with a letter, and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`), underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent signs (`%`). It must be between 3 and 255 characters in length, and it must not start with `"goog"`.
`topic`	`string` Required. The name of the topic from which this subscription is receiving messages. Format is `projects/{project}/topics/{topic}`. The value of this field will be `_deleted-topic_` if the topic has been deleted. Please see Google\Cloud\PubSub\V1\SubscriberClient::topicName() for help formatting this field.
`pushConfig`	`Google\Cloud\PubSub\V1\PushConfig` If push delivery is used with this subscription, this field is used to configure it.
`ackDeadlineSeconds`	`int` The approximate amount of time (on a best-effort basis) Pub/Sub waits for the subscriber to acknowledge receipt before resending the message. In the interval after the message is delivered and before it is acknowledged, it is considered to be outstanding. During that time period, the message will not be redelivered (on a best-effort basis). For pull subscriptions, this value is used as the initial value for the ack deadline. To override this value for a given message, call `ModifyAckDeadline` with the corresponding `ack_id` if using non-streaming pull or send the `ack_id` in a `StreamingModifyAckDeadlineRequest` if using streaming pull. The minimum custom deadline you can specify is 10 seconds. The maximum custom deadline you can specify is 600 seconds (10 minutes). If this parameter is 0, a default value of 10 seconds is used. For push delivery, this value is also used to set the request timeout for the call to the push endpoint. If the subscriber never acknowledges the message, the Pub/Sub system will eventually redeliver the message.

Returns
Type	Description
`Google\Cloud\PubSub\V1\Subscription`