Default retry policy

This is the retry policy used by default. It retries when there is a high chance that it might help.
This policy is based on the one in DataStax Java Driver. The behaviour is the same.

Examples

To use in Session:

#![allow(unused)]
fn main() {
extern crate scylla;
use scylla::Session;
use std::error::Error;
async fn check_only_compiles() -> Result<(), Box<dyn Error>> {
use scylla::{Session, SessionBuilder};
use scylla::transport::retry_policy::DefaultRetryPolicy;

let session: Session = SessionBuilder::new()
    .known_node("127.0.0.1:9042")
    .retry_policy(Box::new(DefaultRetryPolicy::new()))
    .build()
    .await?;
Ok(())
}
}

To use in a simple query:

#![allow(unused)]
fn main() {
extern crate scylla;
use scylla::Session;
use std::error::Error;
async fn check_only_compiles(session: &Session) -> Result<(), Box<dyn Error>> {
use scylla::query::Query;
use scylla::transport::retry_policy::DefaultRetryPolicy;

// Create a Query manually and set the retry policy
let mut my_query: Query = Query::new("INSERT INTO ks.tab (a) VALUES(?)");
my_query.set_retry_policy(Box::new(DefaultRetryPolicy::new()));

// Run the query using this retry policy
let to_insert: i32 = 12345;
session.query(my_query, (to_insert,)).await?;
Ok(())
}
}

To use in a prepared query:

#![allow(unused)]
fn main() {
extern crate scylla;
use scylla::Session;
use std::error::Error;
async fn check_only_compiles(session: &Session) -> Result<(), Box<dyn Error>> {
use scylla::prepared_statement::PreparedStatement;
use scylla::transport::retry_policy::DefaultRetryPolicy;

// Create PreparedStatement manually and set the retry policy
let mut prepared: PreparedStatement = session
    .prepare("INSERT INTO ks.tab (a) VALUES(?)")
    .await?;

prepared.set_retry_policy(Box::new(DefaultRetryPolicy::new()));

// Run the query using this retry policy
let to_insert: i32 = 12345;
session.execute(&prepared, (to_insert,)).await?;
Ok(())
}
}