From 0bac605778948a2adf61a293454bc2dc50e8a0c1 Mon Sep 17 00:00:00 2001
From: Paul Horn <dev@knutwalker.engineer>
Date: Fri, 29 Sep 2023 17:18:53 +0200
Subject: [PATCH] GH-106 test

---
 lib/tests/concurrency.rs | 83 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 lib/tests/concurrency.rs

diff --git a/lib/tests/concurrency.rs b/lib/tests/concurrency.rs
new file mode 100644
index 0000000..f61a91a
--- /dev/null
+++ b/lib/tests/concurrency.rs
@@ -0,0 +1,83 @@
+use std::sync::{atomic::AtomicUsize, Arc};
+
+use neo4rs::*;
+use tokio::sync::Semaphore;
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 8)]
+async fn concurrency() -> Result<()> {
+    let uri = "bolt://127.0.0.1:7687";
+    let user = "neo4j";
+    let password = "neoneoneo";
+
+    let config = ConfigBuilder::default()
+        .uri(uri)
+        .user(user)
+        .password(password)
+        .max_connections(10240)
+        .build()
+        .unwrap();
+
+    let graph = Arc::new(Graph::connect(config).await.unwrap());
+
+    let semaphore = Arc::new(Semaphore::new(1024));
+    let mut acc: usize = 0;
+    let connections = Arc::new(AtomicUsize::new(0));
+    let successes = Arc::new(AtomicUsize::new(0));
+    let errors = Arc::new(AtomicUsize::new(0));
+
+    tokio::spawn({
+        let c = connections.clone();
+        let s = successes.clone();
+        let e = errors.clone();
+        async move {
+            loop {
+                tokio::time::sleep(tokio::time::Duration::from_secs(3)).await;
+                println!(
+                    "live connections: {} successes: {} errors: {}",
+                    c.load(std::sync::atomic::Ordering::Relaxed),
+                    s.load(std::sync::atomic::Ordering::Relaxed),
+                    e.load(std::sync::atomic::Ordering::Relaxed),
+                );
+            }
+        }
+    });
+
+    loop {
+        let permit = semaphore.clone();
+        let _permit = permit.acquire_owned().await.unwrap();
+
+        let connections = connections.clone();
+        let successes = successes.clone();
+        let errors = errors.clone();
+        let cloned_graph = graph.clone();
+        let cloned_acc = acc.to_string();
+
+        tokio::spawn(async move {
+            connections.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+            let temp = cloned_graph
+                .run(neo4rs::query(&format!(
+                    "MERGE (n:Num {{num: '{cloned_acc}'}});"
+                )))
+                .await;
+            match temp {
+                Ok(_) => {
+                    successes.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+                }
+                Err(err) => {
+                    match err {
+                        Error::UnexpectedMessage(msg)
+                        | Error::UnknownMessage(msg)
+                        | Error::AuthenticationError(msg) => {
+                            println!("error: {}", msg);
+                        }
+                        _ => {}
+                    };
+                    errors.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+                }
+            }
+            connections.fetch_sub(1, std::sync::atomic::Ordering::Relaxed);
+            std::mem::drop(_permit);
+        });
+        acc += 1;
+    }
+}