Discard old data — evict what's already buffered to make room
要确保 package 包名声明必须与 Gradle 配置中的 package 路径完全一致，如果包名错误，Protobuf 编译器可能无法生成对应的实体类文件。
。业内人士推荐服务器推荐作为进阶阅读
Joel Yliluoma’s Algorithms
By this point, fermaw understood that his player instance was being ambushed whenever it called .play(). He tried to isolate the player from the main window context entirely.