Rename ArenaAllocator -> Arena

design.md

@@ -48,7 +48,7 @@ ninja test    # or ctest
 ```
 
 **Individual targets:**
-- `./test_arena_allocator` - Arena allocator unit tests
+- `./test_arena` - Arena allocator unit tests
 - `./test_commit_request` - JSON parsing and validation tests
 - `./test_http_handler` - HTTP protocol handling tests
 - `./test_metric` - Metrics system tests
@@ -56,7 +56,7 @@ ninja test    # or ctest
 - `./test_server_connection_return` - Connection lifecycle tests
 
 **Benchmarking:**
-- `./bench_arena_allocator` - Memory allocation performance
+- `./bench_arena` - Memory allocation performance
 - `./bench_commit_request` - JSON parsing performance
 - `./bench_parser_comparison` - Compare vs nlohmann::json and RapidJSON
 - `./bench_metric` - Metrics system performance
@@ -90,7 +90,7 @@ ninja test    # or ctest
 
 ### Core Components
 
-#### **Arena Allocator** (`src/arena_allocator.hpp`)
+#### **Arena Allocator** (`src/arena.hpp`)
 
 Ultra-fast memory allocator optimized for request/response patterns:
 
@@ -290,7 +290,7 @@ See [style.md](style.md) for comprehensive C++ coding standards and conventions.
 - **Server Creation**: Always use `Server::create()` factory method - direct construction is impossible
 - **Connection Creation**: Only the Server can create connections - no public constructor or factory method
 - **Connection Ownership**: Use unique_ptr semantics for safe ownership transfer between components
-- **Arena Allocator Pattern**: Always use `ArenaAllocator` for temporary allocations within request processing
+- **Arena Allocator Pattern**: Always use `Arena` for temporary allocations within request processing
 - **String View Usage**: Prefer `std::string_view` over `std::string` when pointing to arena-allocated memory
 - **Ownership Transfer**: Use `Server::release_back_to_server()` for returning connections to server from handlers
 - **JSON Token Lookup**: Use the gperf-generated perfect hash table in `json_tokens.hpp` for O(1) key recognition
@@ -375,7 +375,7 @@ class HttpHandler : public ConnectionHandler {
 public:
   void on_data_arrived(std::string_view data, std::unique_ptr<Connection>& conn_ptr) override {
     // Parse HTTP request using connection's arena
-    ArenaAllocator& arena = conn_ptr->get_arena();
+    Arena& arena = conn_ptr->get_arena();
 
     // Generate response
     conn_ptr->append_message("HTTP/1.1 200 OK\r\n\r\nHello World");
@@ -468,7 +468,7 @@ public:
 #### Arena-Based String Handling
 ```cpp
 // Preferred: String view with arena allocation to minimize copying
-std::string_view process_json_key(const char* data, ArenaAllocator& arena);
+std::string_view process_json_key(const char* data, Arena& arena);
 
 // Avoid: Unnecessary string copies
 std::string process_json_key(const char* data);
@@ -513,13 +513,13 @@ ParseResult parse_commit_request(const char* json, CommitRequest& out);
 ### Build Targets
 
 **Test Executables:**
-- `test_arena_allocator` - Arena allocator functionality tests
+- `test_arena` - Arena allocator functionality tests
 - `test_commit_request` - JSON parsing and validation tests
 - `test_metric` - Metrics system functionality tests
 - Main server executable (compiled from `src/main.cpp`)
 
 **Benchmark Executables:**
-- `bench_arena_allocator` - Arena allocator performance benchmarks
+- `bench_arena` - Arena allocator performance benchmarks
 - `bench_commit_request` - JSON parsing performance benchmarks
 - `bench_parser_comparison` - Comparison benchmarks vs nlohmann::json and RapidJSON
 - `bench_metric` - Metrics system performance benchmarks