rlink 0.6.16

High performance Stream Processing Framework
Documentation 
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use crate::core::cluster::{ResponseCode, StdResponse};
use crate::core::runtime::ClusterDescriptor;
use crate::dag::metadata::DagMetadata;
use crate::utils::http::client::get_sync;

#[derive(Clone, Serialize, Deserialize)]
pub(crate) struct MetadataLoader {
    coordinator_address: String,
    cluster_descriptor_cache: Option<ClusterDescriptor>,
    dag_metadata_cache: Option<DagMetadata>,
}

impl MetadataLoader {
    pub fn new(coordinator_address: &str) -> Self {
        MetadataLoader {
            coordinator_address: coordinator_address.to_string(),
            cluster_descriptor_cache: None,
            dag_metadata_cache: None,
        }
    }

    pub fn get_cluster_descriptor(&mut self) -> ClusterDescriptor {
        let url = format!("{}/api/cluster_metadata", self.coordinator_address);
        loop {
            match get_sync(url.as_str()) {
                Ok(resp) => {
                    let resp_model: StdResponse<ClusterDescriptor> =
                        serde_json::from_str(resp.as_str()).unwrap();
                    let StdResponse { code, data } = resp_model;
                    if code != ResponseCode::OK || data.is_none() {
                        panic!("get remote JobDescriptor with error code: {}", resp);
                    }

                    let cluster_descriptor = data.unwrap();
                    self.cluster_descriptor_cache = Some(cluster_descriptor.clone());

                    return cluster_descriptor;
                }
                Err(e) => {
                    error!("get metadata(`JobDescriptor`) error. {}", e);
                    std::thread::sleep(std::time::Duration::from_secs(2));
                }
            }
        }
    }

    pub fn get_dag_metadata(&mut self) -> DagMetadata {
        let url = format!("{}/api/dag_metadata", self.coordinator_address);
        loop {
            match get_sync(url.as_str()) {
                Ok(resp) => {
                    let resp_model: StdResponse<DagMetadata> =
                        serde_json::from_str(resp.as_str()).unwrap();
                    let StdResponse { code, data } = resp_model;
                    if code != ResponseCode::OK || data.is_none() {
                        panic!("get remote JobDescriptor with error code: {}", resp);
                    }

                    let dag_metadata = data.unwrap();
                    self.dag_metadata_cache = Some(dag_metadata.clone());

                    return dag_metadata;
                }
                Err(e) => {
                    error!("get metadata(`JobDescriptor`) error. {}", e);
                    std::thread::sleep(std::time::Duration::from_secs(2));
                }
            }
        }
    }
}