Class: Google::Apis::SpannerV1::ReadOnly
- Inherits:
-
Object
- Object
- Google::Apis::SpannerV1::ReadOnly
- Includes:
- Core::Hashable, Core::JsonObjectSupport
- Defined in:
- generated/google/apis/spanner_v1/classes.rb,
generated/google/apis/spanner_v1/representations.rb,
generated/google/apis/spanner_v1/representations.rb
Overview
Message type to initiate a read-only transaction.
Instance Attribute Summary collapse
-
#exact_staleness ⇒ String
Executes all reads at a timestamp that is
exact_staleness
old. -
#max_staleness ⇒ String
Read data at a timestamp >=
NOW - max_staleness
seconds. -
#min_read_timestamp ⇒ String
Executes all reads at a timestamp >=
min_read_timestamp
. -
#read_timestamp ⇒ String
Executes all reads at the given timestamp.
-
#return_read_timestamp ⇒ Boolean
(also: #return_read_timestamp?)
If true, the Cloud Spanner-selected read timestamp is included in the Transaction message that describes the transaction.
-
#strong ⇒ Boolean
(also: #strong?)
Read at a timestamp where all previously committed transactions are visible.
Instance Method Summary collapse
-
#initialize(**args) ⇒ ReadOnly
constructor
A new instance of ReadOnly.
-
#update!(**args) ⇒ Object
Update properties of this object.
Methods included from Core::JsonObjectSupport
Methods included from Core::Hashable
Constructor Details
#initialize(**args) ⇒ ReadOnly
Returns a new instance of ReadOnly.
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# File 'generated/google/apis/spanner_v1/classes.rb', line 2405 def initialize(**args) update!(**args) end |
Instance Attribute Details
#exact_staleness ⇒ String
Executes all reads at a timestamp that is exact_staleness
old. The timestamp is chosen soon after the read is started.
Guarantees that all writes that have committed more than the
specified number of seconds ago are visible. Because Cloud Spanner
chooses the exact timestamp, this mode works even if the client's
local clock is substantially skewed from Cloud Spanner commit
timestamps.
Useful for reading at nearby replicas without the distributed
timestamp negotiation overhead of max_staleness
.
Corresponds to the JSON property exactStaleness
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# File 'generated/google/apis/spanner_v1/classes.rb', line 2349 def exact_staleness @exact_staleness end |
#max_staleness ⇒ String
Read data at a timestamp >= NOW - max_staleness
seconds. Guarantees that all writes that have committed more
than the specified number of seconds ago are visible. Because
Cloud Spanner chooses the exact timestamp, this mode works even if
the client's local clock is substantially skewed from Cloud Spanner
commit timestamps.
Useful for reading the freshest data available at a nearby
replica, while bounding the possible staleness if the local
replica has fallen behind.
Note that this option can only be used in single-use
transactions.
Corresponds to the JSON property maxStaleness
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# File 'generated/google/apis/spanner_v1/classes.rb', line 2364 def max_staleness @max_staleness end |
#min_read_timestamp ⇒ String
Executes all reads at a timestamp >= min_read_timestamp
.
This is useful for requesting fresher data than some previous
read, or data that is fresh enough to observe the effects of some
previously committed transaction whose timestamp is known.
Note that this option can only be used in single-use transactions.
A timestamp in RFC3339 UTC \"Zulu\" format, accurate to nanoseconds.
Example: "2014-10-02T15:01:23.045123456Z"
.
Corresponds to the JSON property minReadTimestamp
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# File 'generated/google/apis/spanner_v1/classes.rb', line 2375 def @min_read_timestamp end |
#read_timestamp ⇒ String
Executes all reads at the given timestamp. Unlike other modes,
reads at a specific timestamp are repeatable; the same read at
the same timestamp always returns the same data. If the
timestamp is in the future, the read will block until the
specified timestamp, modulo the read's deadline.
Useful for large scale consistent reads such as mapreduces, or
for coordinating many reads against a consistent snapshot of the
data.
A timestamp in RFC3339 UTC \"Zulu\" format, accurate to nanoseconds.
Example: "2014-10-02T15:01:23.045123456Z"
.
Corresponds to the JSON property readTimestamp
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# File 'generated/google/apis/spanner_v1/classes.rb', line 2389 def @read_timestamp end |
#return_read_timestamp ⇒ Boolean Also known as: return_read_timestamp?
If true, the Cloud Spanner-selected read timestamp is included in
the Transaction message that describes the transaction.
Corresponds to the JSON property returnReadTimestamp
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# File 'generated/google/apis/spanner_v1/classes.rb', line 2395 def @return_read_timestamp end |
#strong ⇒ Boolean Also known as: strong?
Read at a timestamp where all previously committed transactions
are visible.
Corresponds to the JSON property strong
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# File 'generated/google/apis/spanner_v1/classes.rb', line 2402 def strong @strong end |
Instance Method Details
#update!(**args) ⇒ Object
Update properties of this object
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# File 'generated/google/apis/spanner_v1/classes.rb', line 2410 def update!(**args) @exact_staleness = args[:exact_staleness] if args.key?(:exact_staleness) @max_staleness = args[:max_staleness] if args.key?(:max_staleness) @min_read_timestamp = args[:min_read_timestamp] if args.key?(:min_read_timestamp) @read_timestamp = args[:read_timestamp] if args.key?(:read_timestamp) @return_read_timestamp = args[:return_read_timestamp] if args.key?(:return_read_timestamp) @strong = args[:strong] if args.key?(:strong) end |