bevy_persistence_database 0.3.0

A persistence and database integration solution for the Bevy game engine
Documentation 
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use bevy_persistence_database::core::db::{
    DatabaseConnection, DocumentKind, PersistenceError, TransactionOperation,
};
use bevy_persistence_database::core::db::connection::EdgeDocument;
use bevy_persistence_database::core::query::{
    EdgeQuerySpecification, PersistenceQuerySpecification,
};
use futures::future::BoxFuture;
use serde_json::Value;
use std::sync::{
    Arc,
    atomic::{AtomicUsize, Ordering},
};

/// Wrapper that counts execute_documents calls and forwards to a real backend.
#[derive(Debug)]
pub struct CountingDbConnection {
    pub inner: Arc<dyn DatabaseConnection>,
    pub queries: Arc<AtomicUsize>,
}

impl CountingDbConnection {
    pub fn new(inner: Arc<dyn DatabaseConnection>, queries: Arc<AtomicUsize>) -> Self {
        Self { inner, queries }
    }
}

impl DatabaseConnection for CountingDbConnection {
    fn document_key_field(&self) -> &'static str {
        self.inner.document_key_field()
    }

    fn execute_keys(
        &self,
        spec: &PersistenceQuerySpecification,
    ) -> BoxFuture<'static, Result<Vec<String>, PersistenceError>> {
        self.inner.execute_keys(spec)
    }

    fn execute_documents(
        &self,
        spec: &PersistenceQuerySpecification,
    ) -> BoxFuture<'static, Result<Vec<Value>, PersistenceError>> {
        self.queries.fetch_add(1, Ordering::SeqCst);
        self.inner.execute_documents(spec)
    }

    fn execute_documents_sync(
        &self,
        spec: &PersistenceQuerySpecification,
    ) -> Result<Vec<Value>, PersistenceError> {
        self.inner.execute_documents_sync(spec)
    }

    fn execute_transaction(
        &self,
        operations: Vec<TransactionOperation>,
    ) -> BoxFuture<'static, Result<Vec<String>, PersistenceError>> {
        self.inner.execute_transaction(operations)
    }

    fn fetch_document(
        &self,
        store: &str,
        entity_key: &str,
    ) -> BoxFuture<'static, Result<Option<(Value, u64)>, PersistenceError>> {
        self.inner.fetch_document(store, entity_key)
    }

    fn fetch_component(
        &self,
        store: &str,
        entity_key: &str,
        comp_name: &str,
    ) -> BoxFuture<'static, Result<Option<Value>, PersistenceError>> {
        self.inner.fetch_component(store, entity_key, comp_name)
    }

    fn fetch_resource(
        &self,
        store: &str,
        resource_name: &str,
    ) -> BoxFuture<'static, Result<Option<(Value, u64)>, PersistenceError>> {
        self.inner.fetch_resource(store, resource_name)
    }

    fn clear_store(
        &self,
        store: &str,
        kind: DocumentKind,
    ) -> BoxFuture<'static, Result<(), PersistenceError>> {
        self.inner.clear_store(store, kind)
    }

    fn count_documents(
        &self,
        spec: &PersistenceQuerySpecification,
    ) -> BoxFuture<'static, Result<usize, PersistenceError>> {
        // Increment the counter since this is a DB operation
        self.queries.fetch_add(1, Ordering::SeqCst);

        // Forward the call to the inner connection
        self.inner.count_documents(spec)
    }

    fn query_edges(
        &self,
        spec: &EdgeQuerySpecification,
    ) -> BoxFuture<'static, Result<Vec<EdgeDocument>, PersistenceError>> {
        self.queries.fetch_add(1, Ordering::SeqCst);
        self.inner.query_edges(spec)
    }
}