Add initial producer code

src/kafka_handle_base.cpp

@@ -0,0 +1,45 @@
+#include "kafka_handle_base.h"
+#include "exceptions.h"
+#include "topic_configuration.h"
+#include "topic.h"
+
+using std::string;
+
+namespace cppkafka {
+
+KafkaHandleBase::KafkaHandleBase() 
+: handle_(nullptr, nullptr) {
+
+}
+
+KafkaHandleBase::KafkaHandleBase(rd_kafka_t* handle) 
+: handle_(handle, &rd_kafka_destroy) {
+
+}
+
+void KafkaHandleBase::set_handle(rd_kafka_t* handle) {
+    handle_ = HandlePtr(handle, &rd_kafka_destroy);
+}
+
+rd_kafka_t* KafkaHandleBase::get_handle() {
+    return handle_.get();
+}
+
+Topic KafkaHandleBase::get_topic(const string& name) {
+    rd_kafka_topic_t* topic = rd_kafka_topic_new(handle_.get(), name.data(), nullptr);
+    if (!topic) {
+        throw Exception("Failed to create topic handle");
+    }
+    return Topic(topic);
+}
+
+Topic KafkaHandleBase::get_topic(const string& name, const TopicConfiguration& config) {
+    rd_kafka_topic_t* topic = rd_kafka_topic_new(handle_.get(), name.data(),
+                                                 config.get_handle());
+    if (!topic) {
+        throw Exception("Failed to create topic handle");
+    }
+    return Topic(topic);
+}
+
+} // cppkafka