You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/PERSIA/rust/persia-embedding-server/src/embedding_worker_service
    
    the code of the file until where you have to start completion: use crate::embedding_parameter_service::{
    EmbeddingParameterNatsServicePublisher, EmbeddingParameterServerError,
    EmbeddingParameterServiceClient,
};

use std::iter::FromIterator;
use std::ops::MulAssign;
use std::path::PathBuf;
use std::sync::atomic::{AtomicU64, AtomicUsize, Ordering};
use std::sync::Arc;
use std::time::{Duration, Instant, SystemTime};

use persia_libs::{
    async_lock::RwLock,
    backoff::{future::retry, ExponentialBackoff},
    bytes, futures,
    hashbrown::HashMap,
    hyper,
    itertools::Itertools,
    lz4, ndarray, once_cell,
    smol::block_on,
    thiserror, tokio, tracing,
};
use snafu::ResultExt;

use persia_common::{
    grad::{EmbeddingGradientBatch, Gradients, SkippableFeatureEmbeddingGradientBatch},
    ndarray_f16_to_f32, ndarray_f32_to_f16,
    optim::OptimizerConfig,
    EmbeddingBatch, FeatureEmbeddingBatch, FeatureRawEmbeddingBatch, FeatureSumEmbeddingBatch,
    IDTypeFeatureBatch, IDTypeFeatureRemoteRef, SingleSignInFeatureBatch,
};
use persia_embedding_config::{
    EmbeddingConfig, EmbeddingWorkerConfi
    
    pub async fn with_nats(nats_publisher: EmbeddingParameterNatsServicePublisher) -> Self {
        tracing::info!("trying to get replica info of embedding servers");

        let mut backoff = ExponentialBackoff::default();
        backoff.max_interval = std::time::Duration::from_millis(500);

        let dst_replica_info: Result<PersiaReplicaInfo, _> = retry(backoff, || async {
            let resp = AllEmbeddingServerClient::get_dst_replica_info(&nats_publisher).await;
            if resp.is_err() {
                tracing::warn!(
                    "failed to get replica info of embedding servers, due to {:?}, retrying",
                    resp
                );
            } else {
                tracing::info!(
                    "succeed to get replica info of embedding servers, {:?}",
                    resp
                );
            }
            Ok(resp?)
        })
        .await;

        let dst_replica_info =
            dst_replica_info.expect("failed to get replica info of embedding servers");

        let instance = Self {
            clients: RwLock::new(Vec::with_capacity(dst_replica_info.replica_size)),
            nats_publisher: Some(nats_publisher),
            dst_replica_size: dst_replica_info.replica_size,
        };

        let servers = instance
            .get_all_addresses()
            .await
            .expect("failed to get ips of embedding servers");

        instance
            .update_rpc_clients(servers, false)
            .await
            .expect("failed to init rpc client for embedding servers");

        instance
    }