| 27 | } |
| 28 | |
| 29 | void RpcServer::HandleRpcs() { |
| 30 | EnqueueRequests(); |
| 31 | |
| 32 | void* tag = nullptr; |
| 33 | bool ok = false; |
| 34 | // NOTE(chengcheng): The is_shutdown bool flag make sure that 'ok = false' occurs ONLY after |
| 35 | // cq_->Shutdown() for security check. |
| 36 | bool is_shutdown = false; |
| 37 | // NOTE(chengcheng): The final end is that cq_->Next() get false and cq_ is empty with no item. |
| 38 | while (cq_->Next(&tag, &ok)) { |
| 39 | auto call = static_cast<CtrlCallIf*>(tag); |
| 40 | if (!ok) { |
| 41 | // NOTE(chengcheng): After call grpc_server_->Shutdown() and cq_->Shutdown(), |
| 42 | // there will trigger some cancel tag items on each RPC. And cq_->Next() can get these tag |
| 43 | // with ok = false. Then delete the tag with CtrlCallIf pointer for recovery. |
| 44 | CHECK(is_shutdown); |
| 45 | CHECK(call); |
| 46 | delete call; |
| 47 | continue; |
| 48 | } |
| 49 | if (call) { |
| 50 | call->Process(); |
| 51 | } else { |
| 52 | // NOTE(chengcheng): A null `call` indicates that this is the shutdown alarm. |
| 53 | CHECK(!is_shutdown); |
| 54 | is_shutdown = true; |
| 55 | grpc_server_->Shutdown(); |
| 56 | cq_->Shutdown(); |
| 57 | |
| 58 | // NOTE(chengcheng): You CANNOT use code 'break;' in this block because that |
| 59 | // there still be items in the cq_. |
| 60 | // 'break;' |
| 61 | } |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | void RpcServer::Init() { |
| 66 | Add([this](CtrlCall<CtrlMethod::kLoadServer>* call) { OnLoadServer(call); }); |