add block queue class

Former-commit-id: b5fabddb317de5e99462124757e8c1e4466bb184

cpp/conf/server_config.yaml

 server_config:
   address: 127.0.0.1
-  port: 21001
+  port: 33001
+  transfer_protocol: json   #optional: binary, compact, json, simple_json, debug
+  server_mode: thread_pool    #optional: simple, non_blocking, hsha, thread_pool, thread_selector
 
 log_config:
   global:
@@ -29,3 +31,6 @@ log_config:
   fatal:
     enabled: false
     filename: "/tmp/logs/vecwise/vecwise_engine-%datetime{%h:%m}-fatal.log"
+
+cache_config:
+    cache_capacity: 16  # unit: GB
\ No newline at end of file

cpp/src/utils/BlockingQueue.h

+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+#pragma once
+
+#include <assert.h>
+#include <condition_variable>
+#include <iostream>
+#include <queue>
+#include <vector>
+
+namespace zilliz {
+namespace vecwise {
+namespace server {
+
+template<typename T>
+class BlockingQueue {
+public:
+    BlockingQueue() : mtx(), full_(), empty_() {}
+
+    BlockingQueue(const BlockingQueue &rhs) = delete;
+
+    BlockingQueue &operator=(const BlockingQueue &rhs) = delete;
+
+    void Put(const T &task);
+
+    T Take();
+
+    T Front();
+
+    T Back();
+
+    size_t Size();
+
+    bool Empty();
+
+    void SetCapacity(const size_t capacity);
+
+private:
+    mutable std::mutex mtx;
+    std::condition_variable full_;
+    std::condition_variable empty_;
+    std::queue<T> queue_;
+    size_t capacity_ = 32;
+};
+
+}
+}
+}
+
+
+#include "./BlockingQueue.inl"

cpp/src/utils/BlockingQueue.inl

+#pragma once
+
+#include "Log.h"
+#include "Error.h"
+
+namespace zilliz {
+namespace vecwise {
+namespace server {
+
+template<typename T>
+void
+BlockingQueue<T>::Put(const T &task) {
+    std::unique_lock <std::mutex> lock(mtx);
+    full_.wait(lock, [this] { return (queue_.size() < capacity_); });
+
+    if (queue_.size() >= capacity_) {
+        std::string error_msg =
+                "blocking queue is full, capacity: " + std::to_string(capacity_) + " queue_size: " +
+                std::to_string(queue_.size());
+        SERVER_LOG_ERROR << error_msg;
+        throw ServerException(SERVER_BLOCKING_QUEUE_EMPTY, error_msg);
+    }
+
+    queue_.push(task);
+    empty_.notify_all();
+}
+
+template<typename T>
+T
+BlockingQueue<T>::Take() {
+    std::unique_lock <std::mutex> lock(mtx);
+    empty_.wait(lock, [this] { return !queue_.empty(); });
+
+    if (queue_.empty()) {
+        std::string error_msg = "blocking queue empty";
+        SERVER_LOG_ERROR << error_msg;
+        throw ServerException(SERVER_BLOCKING_QUEUE_EMPTY, error_msg);
+    }
+
+    T front(queue_.front());
+    queue_.pop();
+    full_.notify_all();
+    return front;
+}
+
+template<typename T>
+size_t
+BlockingQueue<T>::Size() {
+    std::lock_guard <std::mutex> lock(mtx);
+    return queue_.size();
+}
+
+template<typename T>
+T
+BlockingQueue<T>::Front() {
+    std::unique_lock <std::mutex> lock(mtx);
+    empty_.wait(lock, [this] { return !queue_.empty(); });
+    if (queue_.empty()) {
+        std::string error_msg = "blocking queue empty";
+        SERVER_LOG_ERROR << error_msg;
+        throw ServerException(SERVER_BLOCKING_QUEUE_EMPTY, error_msg);
+    }
+    T front(queue_.front());
+    return front;
+}
+
+template<typename T>
+T
+BlockingQueue<T>::Back() {
+    std::unique_lock <std::mutex> lock(mtx);
+    empty_.wait(lock, [this] { return !queue_.empty(); });
+
+    if (queue_.empty()) {
+        std::string error_msg = "blocking queue empty";
+        SERVER_LOG_ERROR << error_msg;
+        throw ServerException(SERVER_BLOCKING_QUEUE_EMPTY, error_msg);
+    }
+
+    T back(queue_.back());
+    return back;
+}
+
+template<typename T>
+bool
+BlockingQueue<T>::Empty() {
+    std::unique_lock <std::mutex> lock(mtx);
+    return queue_.empty();
+}
+
+template<typename T>
+void
+BlockingQueue<T>::SetCapacity(const size_t capacity) {
+    capacity_ = (capacity > 0 ? capacity : capacity_);
+}
+
+}
+}
+}
+

cpp/src/utils/Error.h

@@ -6,6 +6,8 @@
 #pragma once
 
 #include <cstdint>
+#include <exception>
+#include <string>
 
 namespace zilliz {
 namespace vecwise {
@@ -28,6 +30,27 @@ constexpr ServerError SERVER_NULL_POINTER = ToGlobalServerErrorCode(0x003);
 constexpr ServerError SERVER_INVALID_ARGUMENT = ToGlobalServerErrorCode(0x004);
 constexpr ServerError SERVER_FILE_NOT_FOUND = ToGlobalServerErrorCode(0x005);
 constexpr ServerError SERVER_NOT_IMPLEMENT = ToGlobalServerErrorCode(0x006);
+constexpr ServerError SERVER_BLOCKING_QUEUE_EMPTY = ToGlobalServerErrorCode(0x007);
+
+class ServerException : public std::exception {
+public:
+    ServerException(ServerError error_code,
+              const std::string &message = std::string())
+            : error_code_(error_code), message_(message) {}
+
+public:
+    ServerError error_code() const {
+        return error_code_;
+    }
+
+    virtual const char *what() const noexcept {
+        return message_.c_str();
+    }
+
+private:
+    ServerError error_code_;
+    std::string message_;
+};
 
 }  // namespace server
 }  // namespace vecwise