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docs: Added timestamp generator docs
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# Timestamp generators | ||
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If you want to generate timestamps on the client side you can provide | ||
a TimestampGenerator to a SessionBuilder when creating a Session. Then | ||
every executed statement will have attached a new timestamp generated | ||
by the provided TimestampGenerator, as longas the statement did not | ||
already have a timestamp provided (e.g. by using the `TIMESTAMP` clause). | ||
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## Monotonic Timestamp Generator | ||
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Most basic client-side timestamp generator. Guarantees monotonic timestamps | ||
based on the system clock, with automatic timestamp incrementation | ||
if the system clock timestamp would not be monotonic. If the clock skew | ||
exceeds warning_threshold of the generator (provided in the constructor, 1s by default) | ||
user will be warned with timestamp generation with warning_interval cooldown period | ||
(provided in the constructor, 1s by default) to not spam the user. | ||
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``` rust | ||
# extern crate scylla; | ||
# use std::error::Error; | ||
# async fn check_only_compiles() -> Result<(), Box<dyn std::error::Error>> { | ||
use scylla::{Session, SessionBuilder}; | ||
use scylla::transport::timestamp_generator::MonotonicTimestampGenerator; | ||
use std::sync::Arc; | ||
use std::time::Duration; | ||
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let session: Session = SessionBuilder::new() | ||
.known_node("127.0.0.1:9042") | ||
.timestamp_generator(Arc::new(MonotonicTimestampGenerator::new())) | ||
.build() | ||
.await?; | ||
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// This query will have a timestamp generated | ||
// by the monotonic timestamp generator | ||
let my_query: Query = Query::new("INSERT INTO ks.tab (a) VALUES(?)"); | ||
let to_insert: i32 = 12345; | ||
session.query_unpaged(my_query, (to_insert,)).await?; | ||
# Ok(()) | ||
# } | ||
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